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  • Uninstall Java on Mac OS X?

    - by Jesse
    I'm working on a trouble shooting document for some desktop software that runs in Java. One of the last resort steps is to completely uninstall and reinstall the Java runtime. In Windows XP this can be done via Add/Remove Programs. Is there something equivalent on OSX? Or does reinstalling the runtime overwrite the current version?

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  • How can i install sun java to Fedora 8

    - by Tushar Ahirrao
    Hi I want to install java on my fedora 8 server but come to the step 9 that is mention in http://fedorasolved.org/browser-solutions/java-i386 but at the step 10 when i enter the command ln -s /opt/jre1.6.0_18/plugin/i386/ns7/libjavaplugin_oji.so /usr/lib/mozilla/plugins/libjavaplugin_oji.so it gives following error ln -s /opt/jre1.6.0_18/plugin/i386/ns7/libjavaplugin_oji.so /usr/lib/mozilla/plugins/libjavaplugin_oji.so ln: creating symbolic link `/usr/lib/mozilla/plugins/libjavaplugin_oji.so': No such file or directory can you help me please?

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  • Free java hosting?

    - by user24729
    Could anyone tell me some free hosting on which I can run my java web application even for a day? I don't want free forever. Free for 2-3 days will be fine I searched a lot on net but couldn't find anything. I just have some .html pages and some servlets in my java web application.

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  • YUI Compressor java

    - by Alexander
    Hi I want to use Yahoo's compressor for compressing js and css files. Which can be found here: http://developer.yahoo.com/yui/compressor/ My only problem is that i have never used Java before. I have no idea how to execute or use this command line. I only have experience with js, jquery and php. It simply says: Usage: java -jar yuicompressor-x.y.z.jar [options] [input file] How should I proceed?

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  • Java application delivery through CDN

    - by tuler
    We have a java application bundled as an applet or as webstart. The client java plugin caches the jar files on the client machine and downloads a new version if there is one. Is it possible to deliver this jar files using a CDN? What are the issues involved? Which CDNs would work for jar delivery? Is this different from static content delivery like images or video?

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  • Problem with java on Windows

    - by Jack
    I had installed jdk-6u18-windows-i586 on my machine. Later on I uninstalled it and installed jdk 1.5.0_13 instead. Now when I do javac -version I get jdk 1.5.0_13 But when I do java -version I get java version "1.6.0_19" How do I fix this?

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  • What could cause this Java UnsatisfiedLinkError?

    - by ahlatimer
    The first part of the stack-trace is as follows: "UnsatisfiedLinkError (/usr/lib/jvm/java-1.5.0-sun-1.5.0.19/jre/lib/i386/libawt.so: libmlib_image.so: cannot open shared object file: No such file or directory):" Both libawt.so and libmlib_image.so exist and are in the same directory. Does libawt.so look in a different directory? Is there an environment option I'm missing? This is part of a Rails application using Rjb (ruby-java bridge). Any help is much appreciated.

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  • Firefox Blocklisting Java

    - by kreeves
    Recently, Mozilla decided to blocklist older versions of the Java plug-in. Unfortunately, this doesn't work well with some internal applications we are using. Does any know if there is a workaround? Perhaps a way to unblock the plug-in for certain domains? I've scoured Google. We're using the most up to date Firefox. Relevant blog post: http://blog.mozilla.com/addons/2012/04/02/blocking-java/

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  • Following the Thread in OSB

    - by Antony Reynolds
    Threading in OSB The Scenario I recently led an OSB POC where we needed to get high throughput from an OSB pipeline that had the following logic: 1. Receive Request 2. Send Request to External System 3. If Response has a particular value   3.1 Modify Request   3.2 Resend Request to External System 4. Send Response back to Requestor All looks very straightforward and no nasty wrinkles along the way.  The flow was implemented in OSB as follows (see diagram for more details): Proxy Service to Receive Request and Send Response Request Pipeline   Copies Original Request for use in step 3 Route Node   Sends Request to External System exposed as a Business Service Response Pipeline   Checks Response to Check If Request Needs to Be Resubmitted Modify Request Callout to External System (same Business Service as Route Node) The Proxy and the Business Service were each assigned their own Work Manager, effectively giving each of them their own thread pool. The Surprise Imagine our surprise when, on stressing the system we saw it lock up, with large numbers of blocked threads.  The reason for the lock up is due to some subtleties in the OSB thread model which is the topic of this post.   Basic Thread Model OSB goes to great lengths to avoid holding on to threads.  Lets start by looking at how how OSB deals with a simple request/response routing to a business service in a route node. Most Business Services are implemented by OSB in two parts.  The first part uses the request thread to send the request to the target.  In the diagram this is represented by the thread T1.  After sending the request to the target (the Business Service in our diagram) the request thread is released back to whatever pool it came from.  A multiplexor (muxer) is used to wait for the response.  When the response is received the muxer hands off the response to a new thread that is used to execute the response pipeline, this is represented in the diagram by T2. OSB allows you to assign different Work Managers and hence different thread pools to each Proxy Service and Business Service.  In out example we have the “Proxy Service Work Manager” assigned to the Proxy Service and the “Business Service Work Manager” assigned to the Business Service.  Note that the Business Service Work Manager is only used to assign the thread to process the response, it is never used to process the request. This architecture means that while waiting for a response from a business service there are no threads in use, which makes for better scalability in terms of thread usage. First Wrinkle Note that if the Proxy and the Business Service both use the same Work Manager then there is potential for starvation.  For example: Request Pipeline makes a blocking callout, say to perform a database read. Business Service response tries to allocate a thread from thread pool but all threads are blocked in the database read. New requests arrive and contend with responses arriving for the available threads. Similar problems can occur if the response pipeline blocks for some reason, maybe a database update for example. Solution The solution to this is to make sure that the Proxy and Business Service use different Work Managers so that they do not contend with each other for threads. Do Nothing Route Thread Model So what happens if there is no route node?  In this case OSB just echoes the Request message as a Response message, but what happens to the threads?  OSB still uses a separate thread for the response, but in this case the Work Manager used is the Default Work Manager. So this is really a special case of the Basic Thread Model discussed above, except that the response pipeline will always execute on the Default Work Manager.   Proxy Chaining Thread Model So what happens when the route node is actually calling a Proxy Service rather than a Business Service, does the second Proxy Service use its own Thread or does it re-use the thread of the original Request Pipeline? Well as you can see from the diagram when a route node calls another proxy service then the original Work Manager is used for both request pipelines.  Similarly the response pipeline uses the Work Manager associated with the ultimate Business Service invoked via a Route Node.  This actually fits in with the earlier description I gave about Business Services and by extension Route Nodes they “… uses the request thread to send the request to the target”. Call Out Threading Model So what happens when you make a Service Callout to a Business Service from within a pipeline.  The documentation says that “The pipeline processor will block the thread until the response arrives asynchronously” when using a Service Callout.  What this means is that the target Business Service is called using the pipeline thread but the response is also handled by the pipeline thread.  This implies that the pipeline thread blocks waiting for a response.  It is the handling of this response that behaves in an unexpected way. When a Business Service is called via a Service Callout, the calling thread is suspended after sending the request, but unlike the Route Node case the thread is not released, it waits for the response.  The muxer uses the Business Service Work Manager to allocate a thread to process the response, but in this case processing the response means getting the response and notifying the blocked pipeline thread that the response is available.  The original pipeline thread can then continue to process the response. Second Wrinkle This leads to an unfortunate wrinkle.  If the Business Service is using the same Work Manager as the Pipeline then it is possible for starvation or a deadlock to occur.  The scenario is as follows: Pipeline makes a Callout and the thread is suspended but still allocated Multiple Pipeline instances using the same Work Manager are in this state (common for a system under load) Response comes back but all Work Manager threads are allocated to blocked pipelines. Response cannot be processed and so pipeline threads never unblock – deadlock! Solution The solution to this is to make sure that any Business Services used by a Callout in a pipeline use a different Work Manager to the pipeline itself. The Solution to My Problem Looking back at my original workflow we see that the same Business Service is called twice, once in a Routing Node and once in a Response Pipeline Callout.  This was what was causing my problem because the response pipeline was using the Business Service Work Manager, but the Service Callout wanted to use the same Work Manager to handle the responses and so eventually my Response Pipeline hogged all the available threads so no responses could be processed. The solution was to create a second Business Service pointing to the same location as the original Business Service, the only difference was to assign a different Work Manager to this Business Service.  This ensured that when the Service Callout completed there were always threads available to process the response because the response processing from the Service Callout had its own dedicated Work Manager. Summary Request Pipeline Executes on Proxy Work Manager (WM) Thread so limited by setting of that WM.  If no WM specified then uses WLS default WM. Route Node Request sent using Proxy WM Thread Proxy WM Thread is released before getting response Muxer is used to handle response Muxer hands off response to Business Service (BS) WM Response Pipeline Executes on Routed Business Service WM Thread so limited by setting of that WM.  If no WM specified then uses WLS default WM. No Route Node (Echo functionality) Proxy WM thread released New thread from the default WM used for response pipeline Service Callout Request sent using proxy pipeline thread Proxy thread is suspended (not released) until the response comes back Notification of response handled by BS WM thread so limited by setting of that WM.  If no WM specified then uses WLS default WM. Note this is a very short lived use of the thread After notification by callout BS WM thread that thread is released and execution continues on the original pipeline thread. Route/Callout to Proxy Service Request Pipeline of callee executes on requestor thread Response Pipeline of caller executes on response thread of requested proxy Throttling Request message may be queued if limit reached. Requesting thread is released (route node) or suspended (callout) So what this means is that you may get deadlocks caused by thread starvation if you use the same thread pool for the business service in a route node and the business service in a callout from the response pipeline because the callout will need a notification thread from the same thread pool as the response pipeline.  This was the problem we were having. You get a similar problem if you use the same work manager for the proxy request pipeline and a business service callout from that request pipeline. It also means you may want to have different work managers for the proxy and business service in the route node. Basically you need to think carefully about how threading impacts your proxy services. References Thanks to Jay Kasi, Gerald Nunn and Deb Ayers for helping to explain this to me.  Any errors are my own and not theirs.  Also thanks to my colleagues Milind Pandit and Prasad Bopardikar who travelled this road with me. OSB Thread Model Great Blog Post on Thread Usage in OSB

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  • Now Live: New Java Enterprise Edition 6 Certification Exams

    - by Paul Sorensen
    The new Java Enterprise Edition 6 (EE6) exams are being released into production, effective today (February 21, 2011). If you participated in the beta exams, we appreciate your patience in awaiting your beta scores (there were some initial technical difficulties with these exams that delayed beta review and scoring). While most of the production exams are currently available and most of the beta scores have been mailed, they are not 100% completed. We expect all production exams to be available and all scores to be mailed tentatively by March 31, 2010. We appreciate your patience in receiving your beta scores as we work through some issues that have delayed the release of beta scores for two of these exams. Beta candidates can expect to receive their printed score reports in the mail from Prometric. Please allow 5 business days from the 'date mailed' below to receive your score report. If you have not received it within 5 business days, please contact Prometric. EXAM  PRODUCTIONDATE BETA SCOREMAILED Loading...CX-311-093 Java Platform, Enterprise Edition 6 Enterprise JavaBeans Developer Certified Expert ExamJanuary 12, 2011February 4, 2011CX-311-094 Java Platform, Enterprise Edition 6 Java Persistence API Developer Certified Expert ExamFebruary 1, 2011February 11, 2011CX-311-232 Java Platform, Enterprise Edition 6 Web Services Developer Certified Expert ExamFebruary 8, 2011by March 31, 2011tentative*CX-311-085 Java Platform, Enterprise Edition 6 JavaServer Pages and Servlet Developer Certified Expert Examby March 31, 2011tentative*by March 31, 2011tentative* *Dates are subject to change without notice.Register now at prometric.com/oracle.QUICK LINKSHelp with beta exam score reportOracle Certified Professional, Java Platform, Enterprise Edition 6 JavaServer Pages and Servlet DeveloperOracle Certified Professional, Java Platform, Enterprise Edition 6 Enterprise JavaBeans DeveloperOracle Certified Professional, Java Platform, Enterprise Edition 6 Java Persistence API DeveloperOracle Certified Professional, Java Platform, Enterprise Edition 6 Web Services Developer

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  • New Regular Expression Features in Java 8

    - by Jan Goyvaerts
    Java 8 brings a few changes to Java’s regular expression syntax to make it more consistent with Perl 5.14 and later in matching horizontal and vertical whitespace. \h is a new feature. It is a shorthand character class that matches any horizontal whitespace character as defined in the Unicode standard. In Java 4 to 7 \v is a character escape that matches only the vertical tab character. In Java 8 \v is a shorthand character class that matches any vertical whitespace, including the vertical tab. When upgrading to Java 8, make sure that any regexes that use \v still do what you want. Use \x0B or \cK to match just the vertical tab in any version of Java. \R is also a new feature. It matches any line break as defined by the Unicode standard. Windows-style CRLF pairs are always matched as a whole. So \R matches \r\n while \R\R fails to match \r\n. \R is equivalent to (?\r\n|[\n\cK\f\r\u0085\u2028\u2029]) with an atomic group that prevents it from matching only the CR in a CRLF pair. Oracle’s documentation for the Pattern class omits the atomic group when explaining \R, which is incorrect. You cannot use \R inside a character class. RegexBuddy and RegexMagic have been updated to support Java 8. Java 4, 5, 6, and 7 are still supported. When you upgrade to Java 8 you can compare or convert your regular expressions between Java 8 and the Java version you were using previously.

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  • Error installing a .NET Windows service with InstallUtil

    - by norlando
    I keep getting the error below when every I try to use the InstallUtil to install my .NET service. I put "installutil myservice.exe" into command prompt and then get the error. Any idea of what the problem is? Do I need to add another parameter? An exception occurred during the Install phase. System.Security.SecurityException: The source was not found, but some or all event logs could not be searched. Inaccessible logs: Security.

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  • Tab Sweep - Upgrade to Java EE 6, Groovy NetBeans, JSR310, JCache interview, OEPE, and more

    - by alexismp
    Recent Tips and News on Java, Java EE 6, GlassFish & more : • Implementing JSR 310 (New Date/Time API) in Java 8 Is Very Strongly Favored by Developers (java.net) • Upgrading To The Java EE 6 Web Profile (Roger) • NetBeans for Groovy (blogs.oracle.com) • Client Side MOXy JSON Binding Explained (Blaise) • Control CDI Containers in SE and EE (Strub) • Java EE on Google App Engine: CDI to the Rescue - Aleš Justin (jaxenter) • The Java EE 6 Example - Testing Galleria - Part 4 (Markus) • Why is OpenWebBeans so fast? (Strub) • Welcome to the new Oracle Enterprise Pack for Eclipse Blog (blogs.oracle.com) • Java Spotlight Episode 75: Greg Luck on JSR 107 Java Temporary Caching API (Spotlight Podcast) • Glassfish cluster installation and administration on top of SSH + public key (Paulo) • Jfokus 2012 on Parleys.com (Parleys) • Java Tuning in a Nutshell - Part 1 (Rupesh) • New Features in Fork/Join from Java Concurrency Master, Doug Lea (DZone) • A Java7 Grammar for VisualLangLab (Sanjay) • Glassfish version 3.1.2: Secure Admin must be enabled to access the DAS remotely (Charlee) • Oracle Announces the Certification of the Oracle Database on Oracle Linux 6 and Red Hat Enterprise Linux 6

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  • Java EE 7 JSR update

    - by Heather VanCura
    Java EE 7 JSR update...in case you missed the last few entries with JSR updates, there are 8 Java EE 7 JSRs currently in JCP milestone review stages.  Your input is requested and needed! JSR 342: Early Draft Review 2– Java Platform, Enterprise Edition 7 (Java EE 7) Specification (review ends 30 November); Oracle JSR 107: Early Draft Review - JCACHE - Java Temporary Caching API (review ends 22 November); Greg Luck, Oracle JSR 236: Early Draft Review – Concurrency Utilities for Java EE (review ends 15 December); Oracle JSR 338: Early Draft Review 2 – Java Persistence 2 (review ends 30 November); Oracle JSR 346: Public Review – Contexts and Dependency Injection for Java EE 1.1 (EC ballot 4-17 December); RedHat JSR 352: Public Review – Batch Applications for the Java Platform (EC ballot 4-17 December); IBM JSR 349: Public Review – Bean Validation 1.1 (EC ballot 20- 26 November); RedHat JSR 339: Public Review – JAX-RS 2.0: The Java API for RESTful Web Services (Review period ended, EC ballot ends 26 November); Oracle  Also, check out the Java EE wiki with a specification and schedule update, including most recently, the addition of JSR 236.

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  • windows service application run fine on windows XP but crashes on windows7

    - by Abbas Siddiqui
    I am sorry If my question asked before, I search extensively but didn't found. If present please post the link of that question. I have developed windows service that works fine on windows xp , when I installed it on windows7 it installed and works fine for few minutes, after that is crashes and gives the following error message. has stopped working windows is checking for the solution to the problem. the log entry is as follows Fault bucket 1155193276, type 5 Event Name: CLR20r3 Response: Not available Cab Id: 0 Problem signature: P1: windowsserviceapp.exe P2: 1.0.0.0 P3: 4bf29a85 P4: System.Windows.Forms P5: 2.0.0.0 P6: 4a275ebd P7: 16cf P8: 159 P9: System.ComponentModel.Win32 P10: Attached files: C:\Users\DELL\AppData\Local\Temp\WERF98D.tmp.WERInternalMetadata.xml These files may be available here: C:\Users\DELL\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_windowsserviceap_89ea5da5168ff1535681aa613b5f7bf2b1636dc_111d24f1 Analysis symbol: Rechecking for solution: 0 Report Id: 24dc8c83-62a1-11df-b1ee-00271352d813

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  • Process Oracle OER Events using a simple Web Service

    - by Bob Webster
    This post provides an example of a simple web service that processes Oracle Enterprise Repository (OER) Events. The service receives events from OER and utilizes the OER REX API to implement simple OER automations for selected event types. The web service example implements the following: When a new Asset is Submitted to OER: The Asset is automatically Accepted by a defined user. When an Asset is Accepted: The Asset is automatically assigned  to a defined user for review. If the accepted asset is of type Service The Version meta data attribute is set based on the version id contained in the suffix of the Service Namespace.      When an Asset is Registered: If the registered Asset is of type Service The related Assets ( Interface and Endpoint are also automatically registered. The sample web service is not intended to replace the out of the Box OER BPM Based workflows, but the service can be utilized in cases where only simple automation is required and the developer has a Java skill set. The service is a lightweight web application that can be easily deployed to the same server as OER or on a different server. Read the complete post here

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  • windows service log on as user a/c on different PC on same workgroup

    - by maruti
    trying to run a service (logon as admin@PC2) from PC1, when both are in work-group fails. why could this happen? OS is win-2003 and please let me know if any windows remote services have to be turned on or firewall configuration? does having PC's on same workgroup help? let me clarify the question: I am unable to see other computers from "Services Logon Tab select User" Object types available are only "users, built in security principals" Location is only local computer. But this is available from mmc console..add snap in how can this be available on services control panel?

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  • Does anyone provide a Skype connection service?

    - by Runc
    Is there a way of offering Skype access to incoming calls while keeping all telephony traffic over our chosen business telephony provision? Is there a 3rd party who can route incoming Skype calls to our telephone system? The business has had requests from contacts wanting to call us via Skype, but we want to keep all telephony via our PBX and phone lines as our geographic location limits our available internet bandwidth. We also prevent installation of non-standard applications on desktops and do not want to add Skype to our build. I was wondering if there were any 3rd parties that provide a connection service that would allow our contacts to call via Skype and us receive the calls via our phone system.

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  • Java EE @ Devoxx UK

    - by delabassee
    Devoxx UK is taking place next week (12th and 13th June) in London. As with any Devoxx conference, this UK edition will have a nice mix of content, an impressive list of speakers and obviously Java EE will be well will covered too:  Apache TomEE, Java EE Web Profile and more on Tomcat (David Blevins) Myths, Tales and Voodoo - About Java EE and Testing (Adam Bien) 50 new features of Java EE 7 (Antonio Goncalves & Arun Gupta) Java EE 7 Hands-on Lab (Arun Gupta) In addition, there will be 2 BoF related to Java EE on Thursday evening, the first BoF will be about the Java EE platform and the second one will be about the Java EE Reference Implementation, i.e. GlassFish. I will participate in the Java EE Community BoF where will discuss Java EE general but with all recent activities, I suspect that a large portion of the BoF will spent on discussing the current plans for Java EE 8.  Right after and in the same room, I will join Steve Millidge of C2B2 for the GlassFish is here to stay! BoF. The goal is to discuss on GlassFish, the current status, the plans for the next release, how the community can contributes, etc. It should be mentioned that attending those BoFs is completely free, just make sure to register here.  So if you are in London next week, mind the Geek and see you at Devoxx UK!

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  • Java Virtual Developer Day Session Videos Available

    - by Tori Wieldt
    How are Lambdas handled on a bytecode level? How does replacing assembly code with Java code improve performance? Can we send flat files/comma separated/XML files to process in Batch? In a Java EE app, can I inject an EJB bean inside a REST POJO using @EJB annotation? Where I can find JavaFX UI controls? At OTN's Virtual Developer Day, Java experts answered these questions and more. Session are now available for you to view on demand (registration required). This is limited time offer: the sessions will be up to view for free for the next two weeks.  You can view sessions from these tracks: Java SE 8 Track Learn about the features scheduled for Java SE 8, including Lambda expressions, extension methods for interfaces and a new Date and Time API. Learn how to create basic apps with JavaFX.  Java EE Track Take a close look at the new functionality in Java EE 7. Get presentations and demos on JSON, WebSockets, Batch, Concurrency, JAX-RS 2, JMS 2,  Java Embedded Track Provides an introductions to the Raspberry Pi, the Keil board, ARM architecture, and how to make it all work with Java Embedded. You know Java, now really know Java. Check out the OTN Virtual Developer Day sessions!

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  • installing a script as startup service in ubuntu

    - by Jibin
    I have a script openerp-server.py in ~/openerp/stable6/server/bin/.I want it to be run at startup.(As a service or not - I don't know the difference) These are the steps I followed 1 Created a script 'openerp-server' with the following lines in /etc/init.d/ #!/bin/sh cd ~/openerp/stable6/server/bin/ exec /usr/bin/python ./openerp-server.py $@ 2 Made the script executable by using the following command sudo chmod +x /etc/init.d/openerp-server 3 Made the link run on startup by using the following command sudo update-rc.d openerp-server I checked using sysv-rc-conf.And openerp-server was selected for run level 2,3,4,5. Now after restarting I checked if the openerp-server.py is running, it was not running. Please help.

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  • OSB, Service Callouts and OQL

    - by Sabha
    Oracle Fusion Middleware customers use Oracle Service Bus (OSB) for virtualizing Service endpoints and implementing stateless service orchestrations. Behind the performance and speed of OSB, there are a couple of key design implementations that can affect application performance and behavior under heavy load. One of the heavily used feature in OSB is the Service Callout pipeline action for message enrichment and invoking multiple services as part of one single orchestration. Overuse of this feature, without understanding its internal implementation, can lead to serious problems. This series will delve into OSB internals, the problem associated with usage of Service Callout under high loads, diagnosing it via thread dump and heap dump analysis using tools like ThreadLogic and OQL (Object Query Language) and resolving it. The first section in the series will mainly cover the threading model used internally by OSB for implementing Route Vs. Service Callouts. The second section of the "OSB, Service Callouts and OQL" blog posting will delve into thread dump analysis of OSB server and detecting threading issues relating to Service Callout and using Heap Dump and OQL to identify the related Proxies and Business services involved. The final section of the series will focus on the corrective action to avoid Service Callout related OSB serer hangs. Before we dive into the solution, we need to briefly discus about Work Managers in WLS. Please refer to the blog posting for more details.

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