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• ArchBeat Link-o-Rama Top 10 for September 9-15, 2012

  - by Bob Rhubart

  The Top 10 most-viewed items shared on the OTN ArchBeat Facebook page for the week of September 9-15, 2017. 15 Lessons from 15 Years as a Software Architect | Ingo Rammer In this presentation from the GOTO Conference in Copenhagen, Ingo Rammer shares 15 tips regarding people, complexity and technology that he learned doing software architecture for 15 years. Attend OTN Architect Day – by Architects, for Architects – October 25 You won't need 3D glasses to take in these live presentations (8 sessions, two tracks) on Cloud computing, SOA, and engineered systems. And the ticket price is: Zero. Nothing. Absolutely free. Register now for Oracle Technology Network Architect Day in Los Angeles. Thursday October 25, 2012, 8:00 a.m. – 5:00 p.m. Sofitel Los Angeles , 8555 Beverly Boulevard , Los Angeles, CA 90048. Cloud API and service designers, stop thinking small | Cloud Computing - InfoWorld "The focus must shift away from fine-grained APIs that provide some type of primitive service, such as pushing data to a block of storage or perhaps making a request to a cloud-rooted database," says InfoWorld's David Linthicum. "To go beyond primitives, you must understand how these services should be used in a much larger architectural context. In other words, you need to understand how businesses will employ these services to form real workplace solutions—inside and outside the enterprise." Adding a runtime picker to a taskflow parameter in WebCenter | Yannick Ongena Oracle ACE Yannick Ongena shows how to create an Oracle WebCenter popup to allow users to "select items or do more complex things." Oracle IAM 11g R2 docs are now available "One of the great things about the new doc set is the inclusion of ePub files," says Fusion Middleware A-Team blogger Chris Johnson. "This means that if you have an iPad you can load up the doc library onto that and read the docs on the couch." Setting up a local Yum Server using the Exalogic ZFS Storage Appliance | Donald A concise technical post from the man named Donald. What's New in Oracle VM VirtualBox 4.2? | The Fat Bloke Sings "One of the trends we've seen is that as the average host platform becomes more powerful, our users are consistently running more and more vm's," says The Fat Bloke. "Some of our users have large libraries of vm's of various vintages, whilst others have groups of vm's that are run together as an assembly of the various tiers in a multi-tiered software solution, for example, a database tier, middleware tier, and front-ends." The new VirtualBox release, a year in the making, addresses the needs of these users, he explains. Configuring Oracle Business Intelligence 11g MDS XML Source Control Management with Git Version Control | Christian Screen Oracle ACE Christian Screen developed this tutorial for those interested in learning how to configure the Oracle Business Intelligence 11g (11.1.1.6) metadata repository for development using the new MDS XML source control management functionality. Identity and Access Management at Oracle Open World 2012 | Brian Eidelman Fusion Middleware A-Team blogger Brian Eideleman highlights three Oracle Openworld sessions that will put Identity and Access Management in the spotlight, and shares a link to the "Focus On: Identity Management" document, a comprehensive listing of Openworld activities also dealing with IM. Starting and stopping WebLogic automatically using Upstart | Chris Johnson "In Ubuntu, RedHat and Oracle Linux there's a new flavor of init called Upstart that all the kids are using," says Oracle Fusion Middleware A-Team member Chris Johnson. "It's the new hotness when it comes to making programs into daemons and wiring them to start and stop at appropriate times." Thought for the Day "The purpose of software engineering is to control complexity, not to create it." — Pamela Zave Source: SoftwareQuotes.com

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• Controlling server configurations with IPS

  - by barts

  I recently received a customer question regarding how they best could control which packages and which versions were used on their production Solaris 11 servers.  They had considered pointing each server at its own software repository - a common initial approach.  A simpler method leverages one of dependency mechanisms we introduced with Solaris 11, but is not immediately obvious to most people. Typically, most internal IT departments qualify particular versions for production use.  What this customer wanted to do was insure that their operations staff only installed internally qualified versions of Solaris on their servers.  The easiest way of doing this is to leverage the 'incorporate' type of dependency in a small package defined for each server type.  From the reference " Packaging and Delivering Software With the Image Packaging System in Oracle® Solaris 11.1":  The incorporate dependency specifies that if the given package is installed, it must be at the given version, to the given version accuracy. For example, if the dependent FMRI has a version of 1.4.3, then no version less than 1.4.3 or greater than or equal to 1.4.4 satisfies the dependency. Version 1.4.3.7 does satisfy this example dependency. The common way to use incorporate dependencies is to put many of them in the same package to define a surface in the package version space that is compatible. Packages that contain such sets of incorporate dependencies are often called incorporations. Incorporations are typically used to define sets of software packages that are built together and are not separately versioned. The incorporate dependency is heavily used in Oracle Solaris to ensurethat compatible versions of software are installed together. An example incorporate dependency is: depend type=incorporate fmri=pkg:/driver/network/ethernet/[email protected],5.11-0.175.0.0.0.2.1 So, to make sure only qualified versions are installed on a server, create a package that will be installed on the machines to be controlled.  This package will contain an incorporate dependency on the "entire" package, which controls the various components used to be build Solaris.  Every time a new version of Solaris has been qualified for production use, create a new version of this package specifying the new version of "entire" that was qualified.  Once this new control package is available in the repositories configured on the production server, the pkg update command will update that system to the specified version.  Unless a new version of the control package is made available, pkg update will report that no updates are available since no version of the control package can be installed that satisfies the incorporate constraint. Note that if desired, the same package can be used to specify which packages must be present on the system by adding either "require" or "group" dependencies; the latter permits removal of some of the packages, the former does not.  More details on this can be found in either the section 5 pkg man page or the previously mentioned reference document. This technique of using package dependencies to constrain system configuration leverages the SAT solver which is at the heart of IPS, and is basic to how we package Solaris itself.  

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• Utility to Script SQL Server Configuration

  - by Bill Graziano

  I wrote a small utility to script some key SQL Server configuration information. I had two goals for this utility: Assist with disaster recovery preparation Identify configuration changes I’ve released the application as open source through CodePlex. You can download it from CodePlex at the Script SQL Server Configuration project page. The application is a .NET 2.0 console application that uses SMO. It writes its output to a directory that you specify.  Disaster Planning ScriptSqlConfig generates scripts for logins, jobs and linked servers.  It writes the properties and configuration from the instance to text files. The scripts are designed so they can be run against a DR server in the case of a disaster. The properties and configuration will need to be manually compared. Each job is scripted to its own file. Each linked server is scripted to its own file. The linked servers don’t include the password if you use a SQL Server account to connect to the linked server. You’ll need to store those somewhere secure. All the logins are scripted to a single file. This file includes windows logins, SQL Server logins and any server role membership.  The SQL Server logins are scripted with the correct SID and hashed passwords. This means that when you create the login it will automatically match up to the users in the database and have the correct password. This is the only script that I programmatically generate rather than using SMO. The SQL Server configuration and properties are scripted to text files. These will need to be manually reviewed in the event of a disaster. Or you could DIFF them with the configuration on the new server. Configuration Changes These scripts and files are all designed to be checked into a version control system.  The scripts themselves don’t include any date specific information. In my environments I run this every night and check in the changes. I call the application once for each server and script each server to its own directory.  The process will delete any existing files before writing new ones. This solved the problem I had where the scripts for deleted jobs and linked servers would continue to show up.  To see any changes I just need to query the version control system to show many any changes to the files. Database Scripting Utilities that script database objects are plentiful.  CodePlex has at least a dozen of them including one I wrote years ago. The code is so easy to write it’s hard not to include that functionality. This functionality wasn’t high on my list because it’s included in a database backup.  Unless you specify the /nodb option, the utility will script out many user database objects. It will script one object per file. It will script tables, stored procedures, user-defined data types, views, triggers, table types and user-defined functions. I know there are more I need to add but haven’t gotten around it yet. If there’s something you need, please log an issue and get it added. Since it scripts one object per file these really aren’t appropriate to recreate an empty database. They are really good for checking into source control every night and then seeing what changed. I know everyone tells me all their database objects are in source control but a little extra insurance never hurts. Conclusion I hope this utility will help a few of you out there. My goal is to have it script all server objects that aren’t contained in user databases. This should help with configuration changes and especially disaster recovery.

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• Session Sharing with another User on *NIX and Windows

  - by Giri Mandalika

  Oracle Solaris Since Solaris is not widely known for its graphical interface, let's just focus on sharing a terminal session in read-only mode with another user on the same system. Here is an example. eg., % finger Login Name TTY Idle When Where root Super-User pts/1 Sat 16:57 dhcp-amer-vpn-rmdc-a sunperf ??? pts/2 4 Sat 16:41 pitcher.sfbay.sun.com In this example, two users root and sunperf are connected to the same system from two different terminals pts/1 and pts/2 respectively. If the root user wants to show something to sunperf user -- what s/he is doing in her/his terminal, for example, it can be accomplished with the following command. script -a /dev/null | tee -a <target_terminal eg., # script -a /dev/null | tee -a /dev/pts/2 Script started, file is /dev/null # # uptime 5:04pm up 1 day(s), 2:56, 2 users, load average: 0.81, 0.81, 0.81 # # isainfo -v 64-bit sparcv9 applications crc32c cbcond pause mont mpmul sha512 sha256 sha1 md5 camellia kasumi des aes ima hpc vis3 fmaf asi_blk_init vis2 vis popc 32-bit sparc applications crc32c cbcond pause mont mpmul sha512 sha256 sha1 md5 camellia kasumi des aes ima hpc vis3 fmaf asi_blk_init vis2 vis popc v8plus div32 mul32 # # exit Script done, file is /dev/null After the script .. | tee .. command, sunperf user should be able to see the root user's stdin and stdout contents in her/his own terminal until the script session exits in root user's terminal. Since this kind of sharing is based on capturing and redirecting the contents to the target terminal, the users on the receiving end won't be able to see whatever is being edited on initiators' terminal [using editors such as vi]. Also it is not possible to share the session with any connected user on the system unless the initiator has the necessary permissions and privileges. The script utility records everything printed in a terminal session, while the tee utility replicates the contents of the screen capture on to the standard output of the target terimal. The tee utility does not buffer the output - so, the screen capture from the initiators' terminal appears almost right away in the target terminal. Though I never tested, this technique may work on all *NIX and Linux flavors with little or no changes. Also there might be other ways to accomplish this. [Thanks to Sujeet for sharing this tip] Microsoft Windows Most of the Windows users may rely on VNC services to share a desktop session. Another way to share the desktop session is to use the Remote Desktop Connection (RDC) client. Here are the steps. Connect to the target Windows system using Remote Desktop Connection client Launch Windows Task Manager Navigate to the "Users" tab Find the user session that you want to connect to and have full control over as the other user who is currently holding that session Select the user name in Windows Task Manager, right click and choose the option "Remote Control" A window pops up on the other user's session with the message "<USER is requesting to control your session remotely. Do you accept the request?" Once the other user says "Yes", you will be granted access to that session. Since then both users should be able to see the same screen and even control the session from their respective workstations.

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• The Future of Air Travel: Intelligence and Automation

  - by BobEvans

  Remember those white-knuckle flights through stormy weather where unexpected plunges in altitude result in near-permanent relocations of major internal organs? Perhaps there’s a better way, according to a recent Wall Street Journal article: “Pilots of a Honeywell International Inc. test plane stayed on their initial flight path, relying on the company's latest onboard radar technology to steer through the worst of the weather. The specially outfitted Boeing 757 barely shuddered as it gingerly skirted some of the most ferocious storm cells over Fort Walton Beach and then climbed above the rest in zero visibility.” Or how about the multifaceted check-in process, which might not wreak havoc on liver location but nevertheless makes you wonder if you’ve been trapped in some sort of covert psychological-stress test? Another WSJ article, called “The Self-Service Airport,” says there’s reason for hope there as well: “Airlines are laying the groundwork for the next big step in the airport experience: a trip from the curb to the plane without interacting with a single airline employee. At the airport of the near future, ‘your first interaction could be with a flight attendant,’ said Ben Minicucci, chief operating officer of Alaska Airlines, a unit of Alaska Air Group Inc.” And in the topsy-turvy world of air travel, it’s not just the passengers who’ve been experiencing bumpy rides: the airlines themselves are grappling with a range of challenges—some beyond their control, some not—that make profitability increasingly elusive in spite of heavy demand for their services. A recent piece in The Economist illustrates one of the mega-challenges confronting the airline industry via a striking set of contrasting and very large numbers: while the airlines pay $7 billion per year to third-party computerized reservation services, the airlines themselves earn a collective profit of only $3 billion per year. In that context, the anecdotes above point unmistakably to the future that airlines must pursue if they hope to be able to manage some of the factors outside of their control (e.g., weather) as well as all of those within their control (operating expenses, end-to-end visibility, safety, load optimization, etc.): more intelligence, more automation, more interconnectedness, and more real-time awareness of every facet of their operations. Those moves will benefit both passengers and the air carriers, says the WSJ piece on The Self-Service Airport: “Airlines say the advanced technology will quicken the airport experience for seasoned travelers—shaving a minute or two from the checked-baggage process alone—while freeing airline employees to focus on fliers with questions. ‘It's more about throughput with the resources you have than getting rid of humans,’ said Andrew O'Connor, director of airport solutions at Geneva-based airline IT provider SITA.” Oracle’s attempting to help airlines gain control over these challenges by blending together a range of its technologies into a solution called the Oracle Airline Data Model, which suggests the following steps: • To retain and grow their customer base, airlines need to focus on the customer experience. • To personalize and differentiate the customer experience, airlines need to effectively manage their passenger data. • The Oracle Airline Data Model can help airlines jump-start their customer-experience initiatives by consolidating passenger data into a customer data hub that drives realtime business intelligence and strategic customer insight. • Oracle’s Airline Data Model brings together multiple types of data that can jumpstart your data-warehousing project with rich out-of-the-box functionality. • Oracle’s Intelligent Warehouse for Airlines brings together the powerful capabilities of Oracle Exadata and the Oracle Airline Data Model to give you real-time strategic insights into passenger demand, revenues, sales channels and your flight network. The airline industry aside, the bullet points above offer a broad strategic outline for just about any industry because the customer experience is becoming pre-eminent in each and there is simply no way to deliver world-class customer experiences unless a company can capture, manage, and analyze all of the relevant data in real-time. I’ll leave you with two thoughts from the WSJ article about the new in-flight radar system from Honeywell: first, studies show that a single episode of serious turbulence can wrack up $150,000 in additional costs for an airline—so, it certainly behooves the carriers to gain the intelligence to avoid turbulence as much as possible. And second, it’s back to that top-priority customer-experience thing and the value that ever-increasing levels of intelligence can deliver. As the article says: “In the cabin, reporters watched screens showing the most intense parts of the nearly 10-mile wide storm, which churned some 7,000 feet below, in vibrant red and other colors. The screens also were filled with tiny symbols depicting likely locations of lightning and hail, which can damage planes and wreak havoc on the nerves of white-knuckle flyers.”  (Bob Evans is senior vice-president, communications, for Oracle.)  

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• Subterranean IL: Exception handling 2

  - by Simon Cooper

  Control flow in and around exception handlers is tightly controlled, due to the various ways the handler blocks can be executed. To start off with, I'll describe what SEH does when an exception is thrown. Handling exceptions When an exception is thrown, the CLR stops program execution at the throw statement and searches up the call stack looking for an appropriate handler; catch clauses are analyzed, and filter blocks are executed (I'll be looking at filter blocks in a later post). Then, when an appropriate catch or filter handler is found, the stack is unwound to that handler, executing successive finally and fault handlers in their own stack contexts along the way, and program execution continues at the start of the catch handler. Because catch, fault, finally and filter blocks can be executed essentially out of the blue by the SEH mechanism, without any reference to preceding instructions, you can't use arbitary branches in and out of exception handler blocks. Instead, you need to use specific instructions for control flow out of handler blocks: leave, endfinally/endfault, and endfilter. Exception handler control flow try blocks You cannot branch into or out of a try block or its handler using normal control flow instructions. The only way of entering a try block is by either falling through from preceding instructions, or by branching to the first instruction in the block. Once you are inside a try block, you can only leave it by throwing an exception or using the leave <label> instruction to jump to somewhere outside the block and its handler. The leave instructions signals the CLR to execute any finally handlers around the block. Most importantly, you cannot fall out of the block, and you cannot use a ret to return from the containing method (unlike in C#); you have to use leave to branch to a ret elsewhere in the method. As a side effect, leave empties the stack. catch blocks The only way of entering a catch block is if it is run by the SEH. At the start of the block execution, the thrown exception will be the only thing on the stack. The only way of leaving a catch block is to use throw, rethrow, or leave, in a similar way to try blocks. However, one thing you can do is use a leave to branch back to an arbitary place in the handler's try block! In other words, you can do this: .try { // ... newobj instance void [mscorlib]System.Exception::.ctor() throw MidTry: // ... leave.s RestOfMethod } catch [mscorlib]System.Exception { // ... leave.s MidTry } RestOfMethod: // ... As far as I know, this mechanism is not exposed in C# or VB. finally/fault blocks The only way of entering a finally or fault block is via the SEH, either as the result of a leave instruction in the corresponding try block, or as part of handling an exception. The only way to leave a finally or fault block is to use endfinally or endfault (both compile to the same binary representation), which continues execution after the finally/fault block, or, if the block was executed as part of handling an exception, signals that the SEH can continue walking the stack. filter blocks I'll be covering filters in a separate blog posts. They're quite different to the others, and have their own special semantics. Phew! Complicated stuff, but it's important to know if you're writing or outputting exception handlers in IL. Dealing with the C# compiler is probably best saved for the next post.

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• The Social Content Conundrum

  - by Mike Stiles

  Here’s the social content conundrum: people who are not entertainers are being asked to entertain. Despite a world of skilled MBAs, marketing savants, technological innovators, analysts, social strategists and consultants, every development in social for brands keeps boomeranging right back to the same unavoidable truth. Success hinges on having content creators who know how to entertain the target audience. You can’t make this all about business-processes. You can’t make this all about technology, though data is critical and helps inform content. This is about having human beings who know the audience, know what they’d love to see, and can create the magic that will draw and hold them. Since showing up in the News Feed is critical for exposition and engagement, and since social ads primarily serve to amplify content that’s performing well, I’m comfortable saying content creators are becoming exponentially recruited and valued. They will no longer be commodities. They’ll be your stars. Social has fundamentally changed the relationship between brand and consumer. No longer can the customer be told to sit down, shut up, and listen to our ads. It’s now all about what consumers are willing to watch or read. Their patience for subjecting themselves to material they aren’t interested in is waning. Therefore, brands must now be producers of entertainment and information content, not merely placers of ads within someone else’s content. Social has given you a huge stage, with an audience sitting out there waiting to see what you’re going to do. What are you putting on that stage? For most corporate environments, entertaining is alien. It’s risky and subjective. Most operate around two foundational principles: control and fear. To entertain and inform with branded content, some control has to go. You control the product. Past that, control is being transferred into the hands of the consumer. The “fear first” culture also has to yield. If you strive to never make waves, you will move absolutely nothing. Because most corporations don’t house entertainers, they must be found then trusted. They’re usually a little weird. The ideas they’ll bring may seem “out there.” But like any business professional, they’ve gone through the training and experiences that make them uniquely good at what they do, even if you don’t quite understand them. It’s okay. It’s what the audience thinks that matters. Get it right, and you’ll be generating one ambassador after another who’s proud to be identified with the brand and will regularly consume and share your content. Entertainment entities are able to shape our culture and succeed beyond their wildest dreams by being beholden to one thing…what the public likes and wants. When brands put the same emphasis on crowd-pleasing content, they too will enjoy brand fame the likes of which they’ve never seen. The stage is yours. Now get out there and go for that applause.

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• Gnome-shell fails to load on 12.10

  - by Githlar

  I'm usually the one answering questions, but in this I'm throughly stumped! My Setup: Ubuntu 12.10 (Dist upgrade form 12.04) ATI M96 [Mobility Radeon HD 4650] Upon the first installation of 12.10 I had all kinds of issues getting the Legacy ATI drivers to install (I guess the source for the drivers isn't kosher with kernel 3.5). So, I added the repository ppa:makson96/fglrx - which has a version of the ATI source patched to work with kernel 3.5. After installation of fglrx-legacy from that PPA, gnome-shell and all my graphics work fine... until today. The Problem I unsuspended my computer today and the screen was black (not off, the black from the gnome lock screen). I'd move my mouse/hit a key and the background would flash and then it'd go back to black. Restarted via VT1 Logged into Gnome (gnome-shell) session, but no gnome-shell! Investigation: First, I went to VT1 and tried export DISPLAY=:0;gnome-shell --replace. It appeared to work fine, switch back to X and nothing. Went back to VT1 and saw this error message: JS ERROR: !!! Exception was: TypeError: Object 0x7fc748129c30 is not a subclass of (null), it's a xO JS ERROR: !!! message = '"Object 0x7fc748129c30 is not a subclass of (null), it's a xO"' JS ERROR: !!! fileName = '"/usr/share/gnome-shell/js/ui/tweener.js"' JS ERROR: !!! lineNumber = '218' JS ERROR: !!! stack = '"()@/usr/share/gnome-shell/js/ui/tweener.js:218 wrapper()@/usr/share/gjs-1.0/lang.js:204 ()@/usr/share/gjs-1.0/lang.js:145 ()@/usr/share/gjs-1.0/lang.js:239 init()@/usr/share/gnome-shell/js/ui/tweener.js:49 init()@/usr/share/gnome-shell/js/ui/environment.js:96 @<main>:1 "' Window manager warning: Log level 32: Execution of main.js threw exception: TypeError: Object 0x7fc748129c30 is not a subclass of (null), it's a xO Note: Everywhere it says "it's a xO", xO is actually garbled and changes every time (I'm thinking memory corruption?) This error is thrown by line 96 of /usr/share/gnome-shell/js/ui/environment.js: tweener.Init() Did a purge of fglrx-legacy, reboot, reinstall fglrx-legacy, reboot... same thing. Did a ppa-purge of ppa:gnome3-team/gnome3, and reinstalled gnome-shell and ubuntu-desktop from the standard repositores... same thing. I'm really at a loss here. I love gnome-shell and after using it for nearly a year now gnome classic just seems so archaic. Additional Information Apt log from the day I first suspended my machine (these are upgrades from the gnome3-team/gnome3 ppa and ubuntu-wine/ppa ppa): Start-Date: 2012-11-24 17:30:28 Commandline: aptdaemon role='role-commit-packages' sender=':1.618' Install: gkbd-capplet:amd64 (3.6.0-0ubuntu1), gnome-control-center-unity:amd64 (1.0-0ubuntu1~ubuntu12.10.1) Upgrade: nautilus:amd64 (3.6.2-0ubuntu0.1~quantal1, 3.6.3-0ubuntu2~ubuntu12.10.1), libgnome-control-center1:amd64 (3.4.2-0ubuntu19, 3.6.3-0ubuntu6~ubuntu12.10.1), wine1.5-i386:i386 (1.5.17-0ubuntu4, 1.5.18-0ubuntu1), wine1.5:amd64 (1.5.17-0ubuntu4, 1.5.18-0ubuntu1), gnome-settings-daemon:amd64 (3.4.2-0ubuntu14, 3.6.3-0ubuntu1~ubuntu12.10.1), gnome-control-center-data:amd64 (3.4.2-0ubuntu19, 3.6.3-0ubuntu6~ubuntu12.10.1), gnome-accessibility-themes:amd64 (3.6.0.2-0ubuntu1, 3.6.2-0ubuntu2~ubuntu12.10.1), gnome-themes-standard:amd64 (3.6.0.2-0ubuntu1, 3.6.2-0ubuntu2~ubuntu12.10.1), wine1.5-amd64:amd64 (1.5.17-0ubuntu4, 1.5.18-0ubuntu1), nautilus-data:amd64 (3.6.2-0ubuntu0.1~quantal1, 3.6.3-0ubuntu2~ubuntu12.10.1), gnome-control-center:amd64 (3.4.2-0ubuntu19, 3.6.3-0ubuntu6~ubuntu12.10.1), libnautilus-extension1a:amd64 (3.6.2-0ubuntu0.1~quantal1, 3.6.3-0ubuntu2~ubuntu12.10.1) End-Date: 2012-11-24 17:31:32 fglrxinfo (driver appears to be working): display: :0 screen: 0 OpenGL vendor string: Advanced Micro Devices, Inc. OpenGL renderer string: ATI Mobility Radeon HD 4650 OpenGL version string: 3.3.11653 Compatibility Profile Context Does anybody have any further ideas?

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• ??????????? - Java SE Embedded 8

  - by kshimizu-Oracle

  Java?OS??????1?????????????????????????????????3?????????????? HEAP: Java????????????????????????????????? NON-HEAP: NON-HEAP????JVM???????????????????Code Cache?Metaspace???2????????????? Code Cache: ????JIT??????????????????????????? Metaspace: HEAP??????????????????????????   JavaVM??????????: VM?????????????????? ??????????????? ????????????????????????????????????????????????????????????????????????? HEAP?Java Mission Control???????????????????? (????)? ????Java SE?????????????API????????????????????????????????????? Mission Control?????API?????????????????????????????????API??????????????? HEAP???????????? VM????????"-Xmx"???????????????? java.lang.Runtime.maxMemory(); ?????HEAP????????? ?????VM????????"-Xms"? ????????????? "-Xms"???????"-Xmx"?????????? java.lang.Runtime.totalMemory(); ???????????HEAP????????????? java.lang.Runtime.freeMemory(); ??NON-HEAP???????????? API??????????? Java Mission Control?????????? ????????????Java Mission Control??????????????????????? ????"NON_HEAP"?????????NON-HEAP?????? ???? HEAP????NON-HEAP?????????????? Java VM???????????????????????????????????????? ?????????????????????????????????? ????HEAP/NON-HEAP?????????????????????????? OS?????????????? Linux???????procfs?Java??????????????????? (VmHWM or VmRSS) ????? ????HEAP/NON-HEAP??????????????????????????? ?????????????????? ??????JVM?????????????????? ?????????????????JVM???????????????????? ???JVM?????? ????????????? Embedded??JVM?????????? ??Embedded???Oracle JVM??????CPU????????????????????????????????????????? ??????CPU??????????????????????????????????????? Minimal/Client/Server??JVM???????????????? ????JVM??????????????????? ??????Compact????????????????? ? 2 - 3?????? Concept Guide (http://docs.oracle.com/javase/8/embedded/embedded-concepts/basic-concepts.htm) ???????? ??JVM??????????? ????????????????????? -Xms: ??????????? ?????????? ?????????????????????????????????????????????????? -Xmx: ??????????? -XX:ReservedCodeCacheSize: Code Cache??????? ?) JIT??????????????Code Cache????????????0???????? -Xint: JIT??????????? ????????????? JIT?????????????????????? ????????????????? -Xss: ???????????????????? ????????????????????????? ????????????????????????????? -XX:CompileThreshold: JIT?????????????????????????????????? ?????????????????????? ????????? ?????????????????? Code Cache?????????? ?????????? ????????????????????? ????????????????????????? ??????????????????????? ?????????????????????

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• Adding ComboBoxItem to ComboBox Issue in Silverlight 4

  - by AlishahNovin

  I recently upgraded my Silverlight app from 3 to 4. After a few hours of bashing my head against the wall, trying to resolve an issue, I've narrowed down the problem to this: I have a user control, with a ComboBox inside it. The ComboBox has a single ComboBoxItem child. The user control exposes a get accessors that returns the ComboBox's Items object, allowing me to add additional ComboBoxItems via xaml. This all worked fine in Silverlight 3, however it's not working in Silverlight 4. As code: //XAML <UserControl ... > <ComboBox Name="myComboBox"> <ComboBoxItem Content="Select an Item" /> </ComboBox> <!-- All my other stuff --> </UserControl> //Code behind public ItemCollection ListItems { get { return myComboBox.Items; } } //Implementation of User-Control <CustomControl:UserControl ... > <CustomControl:UserControl.ListItems> <ComboBoxItem Content="Item 1" /> <ComboBoxItem Content="Item 2" /> <ComboBoxItem Content="Item 3" /> </CustomControl:UserControl.ListItems> </CustomControl:UserControl> As I mentioned, this all worked fine in Silverlight 3, but doesn't work in Silverlight 4. The workaround, it seems, is to remove that single ComboBoxItem that's inside my user-control, but I'm hoping to avoid, as I want it as the default item. Any help would be much appreciated!

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• Edit/Access data from a CheckBox column in an ASPX:GridView - c#

  - by Endo

  Hi, I have a GridView to which I bind a dataTable I manually create. Both the GridView and the dataTable contain 2 columns, Name and isBusy. My GridView looks like this <Columns> <asp:BoundField HeaderText="Name" DataField="Name" SortExpression="Name"> </asp:BoundField> <asp:CheckBoxField DataField="isBusy" HeaderText="Busy" SortExpression="isBusy" /> </Columns> That works fine, except that the Busy column is non-editable unless you set a specific row to edit mode. I require the entire column of checkboxes to be checkable. So I converted the column to a template, and so the columns look like this: <Columns> <asp:BoundField HeaderText="Name" DataField="Name" SortExpression="Name"> </asp:BoundField> <asp:TemplateField HeaderText="Busy" SortExpression="isBusy"> <ItemTemplate> <asp:CheckBox ID="isBusy" runat="server" Checked='<%# Eval("isBusy") %>' oncheckedchanged="CheckBoxBusy_CheckedChanged" /> </ItemTemplate> </asp:TemplateField> </Columns> Now, this throws an error at runtime, saying System.InvalidCastException was unhandled by user code Message="Specified cast is not valid." Source="App_Web_zzjsqlrr" StackTrace: at ASP.proyectos_aspx.__DataBinding__control24(Object sender, EventArgs e) in c:\Proyect\Users.aspx:line 189 at System.Web.UI.Control.OnDataBinding(EventArgs e) at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) at System.Web.UI.Control.DataBind() at System.Web.UI.Control.DataBindChildren() InnerException: Any idea why this is happening? The next step I would need is to know how to set and get a checkbox's state (haven't been able to find how to manually check a checkbox). I appreciate very much any help.

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• Microsoft Expression Blend 3 - Show / Hide a popup

  - by imayam

  Hi, I'm using this for the very first time to do some quick prototyping (using sketchflow). I have a simple dialog window that I want to show when a button it pressed and then hide when a button (in the dialog, like an "OK" button) is pressed. If someone could just point me in the direction of a simple tutorial on how to do this I'd be happy, or even if you have a simple example you can post here that would be great (I've been trying to google this forever!). I can tell you what I have tried (although obviously it doesn't work) Created a user control, called it "MyDialog". That user control is a simple box which is the bit of gui I want to overlay when the user clicks a button. In that user control I gave it two states "Show" and "Hide". The "Hide" state has all visability to the elements in this user control set to none and "Show" shows everything Created a button in my main screen. That button I gave a it a behaviour "ActivateStateAction". In the properties of that behaviour I set the TargetScreen to be "MyDialog" and the TargetState to be "Show". (I also set the target screen to be MyprojectName.MyProjectNameScreens.MyDialog, that doesn't work either)

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• Dynamically specify and change a Silverlight DataGrid's columns during runtime (MVVM)

  - by Biggert

  What's the best method of dynamically specifying DataGrid columns in the Silverlight DataGrid control at runtime following the MVVM pattern? What I'd like to do would be bind the "DataGrid.Columns" property to a property in my ViewModel so that, if the user adds/removes columns, I simply update the ViewModel property and the DataGrid would change. Problem is, the "DataGrid.Columns" property can't be bound to (I don't think). Because this property isn't available nor is the DataGrid control itself available at the ViewModel level, my current approach is to step outside of the MVVM pattern for this particular implementation and capture certain events in View's code-behind using MVVM Light's Messenger class and then talk directly with the DataGrid control to achieve this capability. I know this is a general statement to this approach without details but is there an easier way... or maybe not so much easier, but a better way that adheres to the MVVM pattern a little better? It's driving me crazy that the DataGrid control's Columns property can't be bound... seems like such a simple thing. FYI - Before it's suggested to use AutoGenerateColumns = True, the class being bound for each item in the collection that's bound to DataGrid.ItemsSource does not have individual properties to identify what is bound to the columns... it's a collection property that contains the columns in order to keep them completely dynamic so that particular path is out. Also, handling the AutoGeneratingColumns and using e.Cancel to show/hide columns is also iffy for this same reason (I think).

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• Report viewer in wpf and selection formula

  - by shabi

  I have a WPF application that I would like to present SQL Server Reporting Services sql 2008 reports in. I understand we have to use host widow control and then in report viewer control. I want to use remote processing mode. My code sample is : I have added namespaces: using System.Windows.Forms; using System.Windows.Forms.Integration; using Microsoft.Reporting; using Microsoft.ReportingServices; using Microsoft.Reporting.WinForms; My XAML: xmlns:wfi="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration" xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms" xmlns:wfr="clr-namespace:Microsoft.Reporting.WinForms;assembly=Microsoft.ReportViewer.WinForms" Title="ReportHost" Height="300" Width="300"> <Grid> <wfi:WindowsFormsHost Height="100" Margin="39,27,39,0" Name="winFormsHost" VerticalAlignment="Top" > <wfr:ReportViewer x:Name="rptViewer" ProcessingMode="Remote" /> </wfi:WindowsFormsHost> </Grid> Code: rptViewer.ServerReport.ReportServerUrl = new Uri("http://mymachine-:8080/ReportServer_myreports"); rptViewer.ServerReport.ReportPath="/Reports/mytestreport.rdl"; rptViewer.ServerReport.Refresh(); My question is that how how can I set selection formula in microsoft report viewer control [like crystal report]. Or miscroft provided any this else which behave like selection formula in crystal reports. And when I run the code it show only report viewer in host window control but not the report data in window. Please some one provide me all step list, Which I have to fallow to get required result with sample code. Quick response will be appricated.

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• Pass object to dynamically loaded ListView ItemTemplate

  - by mickyjtwin

  I have been following the following post on using multiple ItemTemplates in a ListView control. While following this example does produce output, I am trying ot figure out how to psas an object through to the ItemTemplate's user control, which I do not seem to be able to do/figure out. protected void lvwComments_OnItemCreated(object sender, ListViewItemEventArgs e) { ListViewDataItem currentItem = (e.Item as ListViewDataItem); Comment comment = (Comment)currentItem.DataItem; if (comment == null) return; string controlPath = string.Empty; switch (comment.Type) { case CommentType.User: controlPath = "~/layouts/controls/General Comment.ascx"; break; case CommentType.Official: controlPath = "~/layouts/controls/Official Comment.ascx"; break; } lvwComments.ItemTemplate = LoadTemplate(Controlpath); } The User Control is as follows: public partial class OfficialComment : UserControl { protected void Page_Load(object sender, EventArgs e) { } } In the example, the values are being output in the ascx page: <%# Eval("ItemName") %> however I need to access the ListItem in this control to do other logic. I cannot figure out how I to send through my Comment item. The sender object and EventArgs do not contain the info.

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• How to share session cookies between Internet Explorer and an ActiveX components hosted in a webpage

  - by jerem

  I am currently working on a .Net application which makes HTTP requests to some web applications hosted on a IIS server. The application is deployed through ClickOnce and is working fine on simple networks architectures. One of our customers has a very complex network involving a custom authentication server on which the user has first to log himself in order to be authenticated and get access to other applications on this network. Once authenticated on this server, a session cookie is created and sent to the user. Every time the user then makes a request on a secured server of the network, this cookie is checked to grant access to the user. If this cookie is not sent with the request, the user is redirected to the login page. The only browser used is Internet Explorer. This cookie cannot be accessed from our .net application since it is executed in another process than the Internet Explorer process which was used to log the user in, and thus is not sent with our requests, which cannot be completed since the server redirects every of our requests to the login page. I had a look at embedding my application into Internet Explorer by making the main control COM visible and creating it on an HTML page with an tag. It is working properly, however the sessions cookies set earlier in the browser are not sent when the ActiveX control makes web requests. I was hoping this sharing of the session information would be automatic (although I didn't really believe it). So my questions are : Is it possible to have access to this cookie in the embedded ActiveX? How? Does it make a difference to use a .Net COM-interop component instead of a "true" ActiveX control? Also, are there specific security words to describe this kind of behaviors (given that I am not an expert at all on security topics, this lack of proper terminology makes it a lot harder to find the needed resources)? My goal is to have my application's requests look the same from the requests made by the host browser's requests, and I thought that embedding the application as an ActiveX control into the browser was the only way to achieve this, however any suggestion on another to do this is welcome.

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• Naming of ASP.NET controls inside User Controls with ASP.NET MVC

  - by skb

  I am wondering if there is a way to make ASP.NET controls play nicely with my ASP.NET MVC app. Here is what I am doing. I have an order page which displays info about a single Order object. The page will normally have a bunch of rows of data, each row representing an OrderItem object. Each row is an ASP.NET User Control. On the user control there is a form element with two text boxes (Quantity and Price), and an update button. When I click the update button, I expect the form to post the data for that individual OrderItem row to a controller method and update the OrderItem record in the database. Here is my problem: When the post happens, the framework complains because the fields on the form don't match the parameters on the controller method. Each form field is something like "OrderItem_1$Quantity" or "OrderItem_2$Price" instead of just "Quantity" or "Price" which would match my method parameters. I have been told that I can overcome this by making sure that the IDs of all my controls are unique for the page, but allow the NAMEs to be repeated between different forms, so that if a form for an individual row is posted, the name can be something that will match what is on my controller method. The only problem is that I am using ASP.NET controls for my text boxes (which I REALLY want to continue doing) and I can't find any way to override the name field. There is no Name propery on an ASP.NET control, and even when I try to set it using the Attributes accessor property by saying "control.Attributes["Name"] = "Price";" it just adds another name= attribute to the HTML tag which doesn't work. Does any one know how I can make this work? I really don't like all of the HtmlHelper functions like TextBox and DropDown because I hate having my .aspx be so PHP or ASP like with the <%% tags and everything. Thanks!

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• VB6 ImageList Frm Code Generation

  - by DAC

  Note: This is probably a shot in the dark, and its purely out of curiosity that I'm asking. When using the ImageList control from the Microsoft Common Control lib (mscomctl.ocx) I have found that VB6 generates FRM code that doesn't resolve to real property/method names and I am curious as to how the resolution is made. An example of the generated FRM code is given below with an ImageList containing 3 images: Begin MSComctlLib.ImageList ImageList1 BackColor = -2147483643 ImageWidth = 100 ImageHeight = 45 MaskColor = 12632256 BeginProperty Images {2C247F25-8591-11D1-B16A-00C0F0283628} NumListImages = 3 BeginProperty ListImage1 {2C247F27-8591-11D1-B16A-00C0F0283628} Picture = "Form1.frx":0054 Key = "" EndProperty BeginProperty ListImage2 {2C247F27-8591-11D1-B16A-00C0F0283628} Picture = "Form1.frx":3562 Key = "" EndProperty BeginProperty ListImage3 {2C247F27-8591-11D1-B16A-00C0F0283628} Picture = "Form1.frx":6A70 Key = "" EndProperty EndProperty End From my experience, a BeginProperty tag typically means a compound property (an object) is being assigned to, such as the Font object of most controls, for example: Begin VB.Form Form1 Caption = "Form1" ClientHeight = 10950 ClientLeft = 60 ClientTop = 450 ClientWidth = 7215 BeginProperty Font Name = "MS Serif" Size = 8.25 Charset = 0 Weight = 400 Underline = 0 'False Italic = -1 'True Strikethrough = 0 'False EndProperty End Which can be easily seen to resolve to VB.Form.Font.<Property Name>. With ImageList, there is no property called Images. The GUID associated with property Images indicates type ListImages which implements interface IImages. This type makes sense, as the ImageList control has a property called ListImages which is of type IImages. Secondly, properties ListImage1, ListImage2 and ListImage3 don't exist on type IImages, but the GUID associated with these properties indicates type ListImage which implements interface IImage. This type also makes sense, as IImages is in fact a collection of IImage. What doesn't make sense to me is how VB6 makes these associations. How does VB6 know to make the association between the name Images - ListImages purely because of an associated type (provided by the GUID) - perhaps because it's the only property of that type? Secondly, how does it resolve ListImage1, ListImage2 and ListImage3 into additions to the collection IImages, and does it use the Add method? Or perhaps the ControlDefault property? Perhaps VB6 has specific knowledge of this control and no logical resolution exists?

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• Microsoft JScript runtime error: 'ShowDatePicker' is undefined

  - by dbobrow

  Working around an issue where my jquery datepicker does not display after postback within an update panel. The textbox (trigger) for the calendar is contained within a control, which is contained within an update panel. I found an article assisting with this issue, and it informed me to do the following Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim tScript As String = "$(function(){ Sys.WebForms.PageRequestManager.getInstance().add_endRequest(ShowDatePicker); });" Page.ClientScript.RegisterStartupScript(Me.GetType(), "async_" & Me.txtAquisition.ClientID, tScript, True) Then on the ascx I have <script type="text/javascript"> function showDatePicker(sender, args) { var control = document.getElementById("<%=txtAquisition.ClientID %>") alert(control); $(control).each(function() { $(this).datepicker({ showOn: 'focus' }); }); } </script> but am getting an undefined error. Am I approaching this in the correct manner? Any other suggestions to ensure my datepicker remains usable within the update panel? Thinking this may be due to the fact that I have the controls nested within an update panel... several of them in fact. Any help on this is greatly appreciated.

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• Stanford iPhone dev Paparazzi 1 setup help

  - by cksubs

  Hi, I'm having trouble using a tab bar control. Basically, when I build and run I'm just getting the blank white default "Window" screen. I was following this guide: http://www.iphoneosdevcafe.com/2010/03/assignment-4-part-1/#comment-36 Drag a Tab Bar Controller from the Library to MainWindow.xib. Control drag from the App Delegate to the Tab Bar Controller. Drag a Navigation Controller from the Library to MainWindow.xib. Control drag from the App Delegate to the Navigation Controller. Drag a second Navigation Controller from the Library to MainWindow.xib. Control drag from the App Delegate to the Navigation Controller. This completes all the connections between the App Delegate and the tab bar and two navigation controllers. By using IB to set up the tab bar and navigation controllers in this way, you need not allocate and init the controllers in AppDelegate.m. When you build and run this, you will see the tab bar controller and two navigation controllers. Is there a step there that he missed? How do I hook the Tab Bar Controller up to the Window? EDIT: Do I need to do something like this? mainTabBar = [[UITabBarController alloc] init]; [window addSubview:mainTabBar.view]; That's still not working, but I feel like I'm on the right track? Why can't this all be done from Interface Builder?

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• Problem with a button's OnClientClick event inside an UpdatePanel

  - by royals

  im using javascript like var TargetBaseControl = null; window.onload = function() { try { //get target base control. TargetBaseControl = document.getElementById('<%= this.GridView1.ClientID %>'); } catch(err) { TargetBaseControl = null; } } function TestCheckBox() { if(TargetBaseControl == null) return false; //get target child control. var TargetChildControl = "chkSelect"; //get all the control of the type INPUT in the base control. var Inputs = TargetBaseControl.getElementsByTagName("input"); for(var n = 0; n < Inputs.length; ++n) if(Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControl,0) >= 0 && Inputs[n].checked) return true; alert('Select at least one checkbox!'); return false; } and inside the update panel i have code like <asp:Button ID="ButtonSave" runat="server" OnClick="ButtonSave_Click" OnClientClick="javascript:return TestCheckBox();" Text="Save" /> when i run the page and click the button then no more further processing just button has been click nothing happan......

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• AccessViolationException from a combo: Attempted to read or write protected memory

  - by Sparky

  Users are occassionally getting the above error when using our application (VB.Net, Winforms, using v2 of the framework). I'm not able to reproduce it. The callstack is as follows: : System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at System.Windows.Forms.NativeWindow.DefWndProc(Message& m) at System.Windows.Forms.Control.DefWndProc(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ComboBox.WndProc(Message& m) at ControlEx.AutoCompleteCombo.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) The code for ControlEx.AutoCompleteCombo.WndProc is as follows: Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message) Try If Not m_fReadOnly Then MyBase.WndProc(m) Else Select Case m.Msg Case WM_LBUTTONDOWN, WM_LBUTTONDBLCLK ' do nothing Case Else MyBase.WndProc(m) End Select End If Catch ex As OutOfMemoryException Throw New OutOfMemoryException("Exception during WndProc for combo " & Me.Name, ex) End Try End Sub The error handling was added so we can determine which combo causes the problem when we get an OutOfMemoryException. Any clues as to what causes this would be muchly appreciated! :-)

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• How do I keep Visual Studio's Windows Forms Designer from deleting controls?

  - by Sören Kuklau

  With several forms of mine, I occasionally run into the following issue: I edit the form using the designer (Visual Studio 2008, Windows Forms, .NET 2.0, VB.NET) to add components, only to find out later that some minor adjustments were made (e.g. the form's size is suddenly changed by a few pixels), and controls get deleted. This happens silently — event-handling methods automatically have their Handles suffix removed, too, so they never get called, and there's no compiler error. I only notice much later or not at all, because I'm working on a different area in the form. As an example, I have a form with a SplitContainer containing an Infragistics UltraListView to the left, and an UltraTabControl to the right. I added a new tab, and controls within, and they worked fine. I later on found out that the list view's scrollbar was suddenly invisible, due to its size being off, and at least one control was removed from a different tab that I hadn't been working on. Is this a known issue with the WinForms Designer, or with Infragistics? I use version control, of course, so I can compare the changes and merge the deleted code back in, but it's a tedious process that shouldn't be necessary. Are there ways to avoid this? Is there a good reason for this to occur? One clue is that the control that was removed may have code (such as a Load event handler) that expects to be run in run time, not design time, and may be throwing an exception. Could this cause Visual Studio to remove the control?

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• Property being immediately reset by ApplicationSetting Property Binding

  - by Slider345

  I have a .net 2.0 windows application written in c#, which currently uses several project settings to store user configurations. The forms in the application are made up of lots of user controls, each of which have properties that need to be set to these project settings. Right now these settings are manually assigned to the user control properties. I was hoping to simplify the code by replacing the manual implementation with ApplicationSettings Property Bindings. However, my first property is not behaving properly at all. The setting is an integer, used to record a port number typed into a text box. The setting is bound to an integer property on a user control, and that property sets the Text property on a TextBox control. When I type a new value into the textbox at runtime, as soon as the textbox loses focus, it is immediately replaced by the original value. A breakpoint on the property shows that it is immediately setting the property to the setting from the properties collection after I set it. Can anyone see what I'm doing wrong? Here's some code: The setting: [global::System.Configuration.UserScopedSettingAttribute()] [global::System.Diagnostics.DebuggerNonUserCodeAttribute()] [global::System.Configuration.DefaultSettingValueAttribute("1000")] public int Port { get{ return ((int)(this["Port"])); } set{ this["Port"] = value; } } The binding: this.ctrlNetworkConfig.DataBindings.Add(new System.Windows.Forms.Binding("PortNumber", global::TestProject.Properties.Settings.Default, "Port", true, System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged)); this.ctrlNetworkConfig.PortNumber = global::TestProject.Properties.Settings.Default.Port; And lastly, the property on the user control: public int PortNumber { get{ int port; if(int.TryParse(this.txtPortNumber.Text, out port)) return port; else return 0; } set{ txtPortNumber.Text = value.ToString(); } } Any thoughts? Thanks in advance for your help. EDIT: Sorry about the formatting, trying to correct.

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• Did I find a bug in WriteableBitmap when using string literals

  - by liserdarts

  For performance reasons I'm converting a large list of images into a single image. This code does exactly what I want. Private Function FlattenControl(Control As UIElement) As Image Control.Measure(New Size(1000, 1000)) Control.Arrange(New Rect(0, 0, 1000, 1000)) Dim ImgSource As New Imaging.WriteableBitmap(1000, 1000) ImgSource.Render(Control, New TranslateTransform) ImgSource.Invalidate Dim Img As New Image Img.Source = ImgSource Return Img End Function I can add all the images into a canvas pass the canvas to this function and I get back one image. My code to load all the images looks like this. Public Function BuildTextures(Layer As GLEED2D.Layer) As FrameworkElement Dim Container As New Canvas For Each Item In Layer.Items If TypeOf Item Is GLEED2D.TextureItem Then Dim Texture = CType(Item, GLEED2D.TextureItem) Dim Url As New Uri(Texture.texture_filename, UriKind.Relative) Dim Img As New Image Img.Source = New Imaging.BitmapImage(Url) Container.Children.Add(Img) End If Next Return FlattenControl(Container) End Function The GLEED2D.Layer and GLEED2D.TextureItem classes are from the free level editor GLEED2D (http://www.gleed2d.de/). The texture_filename on every TextureItem is "Images/tree_clipart_pine_tree.png" This works just fine, but it's just a proof of concept. What I really need to do (among other things) is have the path to the image hard coded. If I replace Texture.texture_filename in the code above with the string literal "Images/tree_clipart_pine_tree.png" the images do not appear in the final merged image. I can add a breakpoint and see that the WriteableBitmap has all of it's pixels as 0 after the call to Invalidate. I have no idea how this could cause any sort of difference, but it gets stranger. If I remove the call to FlattenControl and just return the Canvas instead, the images are visible. It's only when I use the string literal with the WriableBitmap that the images do not appear. I promise you that the value in the texture_filename property is exactly "Images/tree_clipart_pine_tree.png". I'm using Silverlight 3 and I've also reproduced this in Silverlight 4. Any ideas?

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