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  • Java EE @ No Fluff Just Stuff Tour

    - by reza_rahman
    If you work in the US and still don't know what the No Fluff Just Stuff (NFJS) Tour is, you are doing yourself a very serious disfavor. NFJS is basically a set program of world class speakers and topics offered at major US cities year round. I am proud to share with you that I recently joined the legendary NFJS troupe. My hope is that this will help solve the lingering problem of effectively spreading the Java EE message here in the US. I had my tour debut on April 4-5 with the NFJS New York Software Symposium. I did four of my most favorite talks and it was not that bad for a start - I have more in the coming months in Columbus Ohio, Denver Colorado and Austin Texas. More details on the tour posted on my personal blog. Hope to see you on the tour soon?

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  • Converting ANTLR AST to Java bytecode using ASM

    - by Nick
    I am currently trying to write my own compiler, targeting the JVM. I have completed the parsing step using Java classes generated by ANTLR, and have an AST of the source code to work from (An ANTLR "CommonTree", specifically). I am using ASM to simplify the generating of the bytecode. Could anyone give a broad overview of how to convert this AST to bytecode? My current strategy is to explore down the tree, generating different code depending on the current node (using "Tree.getType()"). The problem is that I can only recognise tokens from my lexer this way, rather than more complex patterns from the parser. Is there something I am missing, or am I simply approaching this wrong? Thanks in advance :)

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  • Management Software in Java for Networked Bus Systems

    - by Geertjan
    Telemotive AG develops complex networked bus systems such as Ethernet, MOST, CAN, FlexRay, LIN and Bluetooth as well as in-house product developments in infotainment, entertainment, and telematics related to driver assistance, connectivity, diagnosis, and e-mobility. Devices such as those developed by Telemotive typically come with management software, so that the device can be configured. (Just like an internet router comes with management software too.) The blue AdmiraL is a development and analysis device for the APIX (Automotive Pixel Link) technology. Here is its management tool: The blue PiraT is an optimised multi-data logger, developed by Telemotive specifically for the automotive industry. With the blue PiraT the communication of bus systems and control units are monitored and relevant data can be recorded very precisely. And here is how the tool is managed: Both applications are created in Java and, as clearly indicated in many ways in the screenshots above, are based on the NetBeans Platform. More details can be found on the Telemotive site.

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  • JDK 7 In Action - Learn With Java Tutorials and Developer Guides

    - by sowmya
    At JavaOne 2012, Stuart Marks, Mike Duigou, and Joe Darcy gave a presentation about JDK 7 In Action. Learn more about using JDK 7 features with the help of Java Tutorials and JDK 7 Developer Guides. Links to relevant information are provided below. If you are considering moving to JDK 7 from a previous release, the JDK 7 Release Notes and JDK 7 Adoption Guide are great resources. Project Coin Features Improved Literals * Literals section in Primitive Datatypes topic. * Binary Literals * Underscores in Numeric Literals Strings In Switch * Strings In Switch Diamond * Type Inference for Generic Instance Creation * Type Inference and Instantiation of Generic Classes Multi-catch and Precise Throw * Catching Multiple Exception Types and Rethrowing Exceptions with Improved Type Checking * Catch Blocks Try-with-resources * The try-with-resources Statement NIO.2 File System API * File I/O for information on path, files, change notification, and more * Zip File System Provider * Zip File System Provider * Developing a Custom File System Provider Fork Join Framework * Fork/Join - Sowmya

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  • Choix technologique : Spring 3.0 ou Java EE 6 pour vos projets Java en 2010 ?

    Fin 2009, ce sont deux solutions très attendues qui ont finalement été livrées : D'un coté Spring 3.0, framework déjà fort utilisé en entreprise, et qui arrive avec quelques nouveautés : Support de Rest, Expression Language, .. Principal atout : Il est déjà utilisable sur des serveurs omniprésents en production (Tomcat, Websphere 6.1,..) De l'autre coté, Java EE 6. Un nouvelle version du standard, beaucoup plus légère et souple que les anciennes versions. Il propose également un profil Web, qui propose des fonctionnalités fort similaire à ce qui est proposé par Spring (EJB Lite, Injection de dépendances, ..). Pour l'heure, la seule implémentation disponible est Glassfish. De votre coté, quelle solution utilise...

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  • Java JRE 7 Certified with Oracle E-Business Suite

    - by LuciaC
    Java Runtime Environment 7u10 (a.k.a. JRE 1.7.0_10 build 18) and later updates on the JRE 7 codeline are now certified with Oracle E-Business Suite Release 11i and 12 Windows-based desktop clients. What do you need to do and where are the official patch requirements? EBS customers should ensure that they are running JRE 7u10, at minimum, on Windows desktop clients.  There are also official patch requirements to avoid compatibility issues of E-Business Suite with JRE 7.  Please refer to Steven Chan's Oracle E-Business Suite Technology blog for all the detailed information regarding this certification.

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  • Removal of the JDBC-ODBC Bridge from Java SE 8 JDK

    - by user12629431
    Starting with Java SE 8, the JDBC-ODBC Bridge will no longer be included with the JDK. The JDBC-ODBC Bridge has always been considered transitional and a non-supported product[1] that was only provided with select JDK bundles and not included with the JRE. The JDBC-ODBC bridge provides limited support for JDBC 2.0 and does not support more recent versions of the JDBC specification. I would recommend that you use a JDBC driver provided by the vendor of your database or a commercial JDBC Driver instead of the JDBC-ODBC Bridge. [1]http://docs.oracle.com/javase/7/docs/technotes/guides/jdbc/bridge.html.

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  • Environment Award for AgroSense Java Farm Management System

    - by Geertjan
    Beating IBM's energy information system and Evoswitch's modular data central hall, Ordina's AgroSense, a farm management system for precision agriculture, received the prestigious IT Environment Award in the Netherlands yesterday. AgroSense is an agricultural services platform created in Java on the NetBeans Platform. It looks like this: Among other things, the team has been investigating whether and how to integrate JavaFX games into the AgroSense platform, as well as other JavaFX-oriented effects. Here's a pic of the red tulip award that the team received yesterday at a black tie award ceremony: The original announcement of the nominations for this competition in English can be read here. On Twitter, you can follow the AgroSense project here: @AgroSense Congratulations, AgroSense team, for this fantastic achievement!

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  • AgroSense in Java Magazine November/December 2012

    - by Geertjan
    AgroSense, the Duke's Choice Award winning open source farm management system from the Netherlands, is featured in the hot-off-the-presses latest edition of the always awesome Java Magazine (November/December 2012): Read the whole article after subscribing for free to the magazine, via clicking the image above or by clicking this link. Note: If you're reading this and your sofware organization is doing anything at all that relates to farm management, consider porting your software to an AgroSense plugin. That would save you an immense amount of time and your users will get a comprehensive farm management system out of the box. Don't reinvent the wheel: create your farm management software on top of the AgroSense Platform!

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  • Android - Multiplayer Game - Client / Server - Java etc

    - by user1405328
    I must write a multiplayer pong game for the school. Where are thousand of rooms and where two players can go in to a room and play together and collect points. I programmed the Pong game using Java (LibGDX). How can I do the Network part. I searched the web. And I came across Kryonet. Is there something better? What should I google. On the Internet there are a lot of those questions. And no good answers. I hope that this most questions can be answered. If someone has actual Open Source network game links, tutorials, books, network tutorial, etc. All this would help everyone. Thank you.

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  • Logica cherche une dizaine de développeurs Java/JEE un peu partout en France et au Luxembourg

    Logica cherche une dizaine de développeurs Java/JEE Un peu partout en France et au Luxembourg Cotée à la Bourse de Londres et d'Amsterdam, Logica est une entreprise de service en business et technologie qui compte plus de 40.000 collaborateurs. Ses activités principales regroupent le conseil en management, l'intégration de technologies et l'externalisation. Des conseils qu'elle promulgue à ses clients un peu partout dans le monde et en Europe. Pour accompagner l'évolution de l'IT (mobilité, montée en puissance des services web, etc.), Logica cherche de nouveaux profils. Et notamment en France. « Nos développeurs travaillent sur plusieurs projets dans une appr...

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  • Moving from a traditional in memory Java session to persistent storage sessions

    - by Benju
    We have decided to take the plunge and move from using a typical java session provider in Tomcat/Jetty/etc to persisting everything to a central datastore. We are looking at using MongoDB for this. A few options come to mind... http://wiki.eclipse.org/Jetty/Tutorial/MongoDB_Session_Clustering This is nice because it will "auto-magically" persist our session to a Mongo installation. I am concerned however that we will not have fine grained control of what is happening. https://github.com/mattinsler/com.lowereast.guiceymongo/ GuiceMongo is interesting as it integrates with Guice. Perhaps we could persist everything via this ORM. Has anybody had to deal with this kind of move? It seems that moving from in memory to persistent session storage has a lot of gotchas.

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  • Invoking JavaScript from Java

    - by Geertjan
    Here's an Action class defined in Java. The Action class executes a script via the JavaFX WebEngine: @NbBundle.Messages("CTL_AddBananasAction=Add Banana") private class AddBananasAction extends AbstractAction { public AddBananasAction() { super(Bundle.CTL_AddBananasAction()); } @Override public void actionPerformed(ActionEvent e) { Platform.runLater(new Runnable() { @Override public void run() { webengine.executeScript("addBanana(' " + newBanana + " ') "); } }); } }How does the 'executescript' call know where to find the JavaScript file? Well, earlier in the code, the WebEngine loaded an HTML file, where the JavaScript file was registered: WebView view = new WebView(); view.setMinSize(widthDouble, heightDouble); view.setPrefSize(widthDouble, heightDouble); webengine = view.getEngine(); URL url = getClass().getResource("home.html"); webengine.load(url.toExternalForm()); Finally, here's a skeleton 'addBanana' method, which is invoked via the Action class shown above: function addBanana(user){ statustext.text(user); } By the way, if you have your JavaScript and CSS embedded within your HTML file, the code navigator combines all three into the same window, which is kind of cool:

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  • Versioning Java APIs in a non-web context

    - by GAP
    I have modular java application which consists of 40 modules. Some of these modules needs to expose external APIs which other modules or any external integration should be using. The system runs as a desktop application and each module is bundled as a separate jar file. My plan is to bundle the external api as a separate jar. But now the question is: how can I maintain multiple versions of the same API to keep backward compatibility in cases where it can co-exist? Are there any de facto standards on handling APIs versioning out of a web context ?

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  • HTML5, PHP, JAVA or asp?

    - by user67418
    I am building a new website for a friend of mine. Its all plain html, and a server side include. The problem is to build static pages for 500 products would not be fun to create, or maintain. So i am forced to at least put dynamic information on these pages based off a spreadsheet, or dynamic pages all together. What i want to do is have a spreadsheet that can be used to keep track of in stock quantity, sku numbers, ecc.. that way i dont have to update hundreds of pages every night. He can just edit the spreadsheet and the pages will automatically adjust. I am a busy man, and i am not asking anyone to just give me the answer. But to save some time what is more worth learning to get this done fastest. HTML5, PHP, JAVA asp, or is there somehthing else better suited?

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  • Android programming. Application stopped unexpectedly.

    - by user277704
    I've just created a prototype of interface for my android app and tried to run it. Unfortunately I get an error that my app has stopped unexpectedly (my reputation doesn't allow me to post images so follow my links): screenshot of error message This is layout mode of editing. Everything looks as I want so there shouldn't be errors: mobileka.freehostia.com/3.png (I can post only one hyperlink...) This is my main.xml code: <code> <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="top" android:background="@drawable/back" > <TextView android:id="@+id/score" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text = "@string/scoreT" android:textColor="@string/scoreColor" android:gravity = "left" android:typeface="serif" android:textStyle="bold|italic" android:textSize="16sp" android:paddingLeft = "10px" android:paddingTop="4px"/ <TextView android:id = "@+id/scoreTxt" android:layout_toRightOf="@+id/score" android:textSize="16sp" android:paddingTop = "5px" android:paddingLeft="4px" android:typeface="serif" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" 0" android:textColor="@string/scoreTextColor" android:gravity = "left"/> <TextView android:id = "@+id/scoreSeparator" android:layout_toRightOf="@+id/scoreTxt" android:textSize="16sp" android:paddingTop = "3px" android:paddingLeft="4px" android:typeface="serif" android:textStyle="bold" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="|" android:textColor="@string/scoreColor" android:gravity = "left"/> <TextView android:id = "@+id/timerTxt" android:layout_alignParentRight="true" android:textSize="16sp" android:paddingRight="10px" android:paddingTop="4px" android:typeface="serif" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@string/scoreTextColor" android:gravity = "right" android:text="00:00" /> <TextView android:id = "@+id/timer" android:layout_toLeftOf="@+id/timerTxt" android:textColor="@string/scoreColor" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="16sp" android:padding = "3px" android:typeface="serif" android:textStyle="bold|italic" android:text="@string/timerT" android:gravity = "left"/> <TextView android:id = "@+id/timerSeparator" android:layout_toLeftOf="@+id/timer" android:textSize="16sp" android:paddingTop = "3px" android:paddingLeft="4px" android:typeface="serif" android:textStyle="bold" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="|" android:textColor="@string/scoreColor" android:gravity = "left"/> <ImageButton android:id="@+id/buttonOne" android:layout_below="@+id/score" android:layout_marginTop="40px" android:layout_marginLeft="14px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:clickable="true" android:src="@drawable/inactive"/> <ImageButton android:id="@+id/buttonTwo" android:layout_toRightOf="@+id/buttonOne" android:layout_marginTop="63px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonThree" android:layout_toRightOf="@+id/buttonTwo" android:layout_marginTop="63px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonFour" android:layout_toRightOf="@+id/buttonThree" android:layout_marginTop="63px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonFive" android:layout_below="@+id/buttonOne" android:layout_marginTop="40px" android:layout_marginLeft="14px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonSix" android:layout_toRightOf="@+id/buttonFive" android:layout_marginTop="164px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonSeven" android:layout_toRightOf="@+id/buttonSix" android:layout_marginTop="164px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonEight" android:layout_toRightOf="@+id/buttonSeven" android:layout_marginTop="164px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonNine" android:layout_below="@+id/buttonEight" android:layout_marginTop="40px" android:layout_marginLeft="14px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonTen" android:layout_toRightOf="@+id/buttonNine" android:layout_marginTop="264px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonEleven" android:layout_toRightOf="@+id/buttonTen" android:layout_marginTop="264px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> <ImageButton android:id="@+id/buttonTwelve" android:layout_toRightOf="@+id/buttonEleven" android:layout_marginTop="264px" android:layout_marginLeft="10px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/inactive" /> And this is my logcat errors (p.s. line #12 is the first TextView in main.xml): 03-26 22:59:31.670: WARN/dalvikvm(185): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 03-26 22:59:31.727: ERROR/AndroidRuntime(185): Uncaught handler: thread main exiting due to uncaught exception 03-26 22:59:31.784: ERROR/AndroidRuntime(185): java.lang.RuntimeException: Unable to start activity ComponentInfo{kz.androidmarket.www.randomtest1/kz.androidmarket.www.randomtest1.randomTest1}: android.view.InflateException: Binary XML file line #12: Error inflating class 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.os.Handler.dispatchMessage(Handler.java:99) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.os.Looper.loop(Looper.java:123) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.ActivityThread.main(ActivityThread.java:4363) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at java.lang.reflect.Method.invokeNative(Native Method) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at java.lang.reflect.Method.invoke(Method.java:521) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at dalvik.system.NativeStart.main(Native Method) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.view.LayoutInflater.createView(LayoutInflater.java:513) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.view.LayoutInflater.rInflate(LayoutInflater.java:618) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.view.LayoutInflater.inflate(LayoutInflater.java:407) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.Activity.setContentView(Activity.java:1622) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at kz.androidmarket.www.randomtest1.randomTest1.onCreate(randomTest1.java:11) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): ... 11 more 03-26 22:59:31.784: ERROR/AndroidRuntime(185): Caused by: java.lang.reflect.InvocationTargetException 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.widget.TextView.(TextView.java:320) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at java.lang.reflect.Constructor.constructNative(Native Method) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at java.lang.reflect.Constructor.newInstance(Constructor.java:446) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.view.LayoutInflater.createView(LayoutInflater.java:500) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): ... 22 more 03-26 22:59:31.784: ERROR/AndroidRuntime(185): Caused by: android.content.res.Resources$NotFoundException: File #ffff9900 from drawable resource ID #0x7f040002: .xml extension required 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.content.res.Resources.loadColorStateList(Resources.java:1820) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.content.res.TypedArray.getColorStateList(TypedArray.java:289) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): at android.widget.TextView.(TextView.java:627) 03-26 22:59:31.784: ERROR/AndroidRuntime(185): ... 26 more Could anybody help me?

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  • Which is more secure: Tomcat standalone or Tomcat behind Apache?

    - by NoozNooz42
    This question is not about performance, nor about load-balancing, etc. Which would be more secure: running Tomcat in standalone mode or running Tomcat behind apache? The thing is, Tomcat is written in Java and hence it is pretty much immune to buffer overrun/overflow (unless a buffer overrun in a C-written lib used by Tomcat can be triggered, but they're rare [the last I remember was in zlib, many many moons ago] and one heck of a hack to actually exploit), which gets rid of a lot of potential exploits. This page: http://wiki.apache.org/tomcat/FAQ/Security has this to say: There have been no public cases of damage done to a company, organization, or individual due to a Tomcat security issue... there have been only theoretical vulnerabilities found. All of those were addressed even though there were no documented cases of actual exploitation of these vulnerabilities. This, combined with the fact that buffer overrun/overflow are pretty much non-existent in Java, makes me believe that Tomcat in standalone mode is pretty secure. In addition to that, I can install both Java and Tomcat on Linux without needing to be root. The only moment I need to be root is to set up a transparent port 8080 to port 80 forwarding (and 8443 to 443). Two iptables line as root, that's all root is needed for. (I don't know for Apache). Apache is much more used than Tomcat and definitely does not have a security track record as good as Tomcat. What would make Tomcat + Apache more secure? What would make Tomcat + Apache less secure? In short: which is more secure, Tomcat standalone or Tomcat with Apache? (remembering that performance aren't an issue here)

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  • Should I use nginx exclusively, or have it as a proxy to Tomcat (performance related)?

    - by Kevin
    I've planned to create a website that'll be pretty heavy on dynamic content, and want to know what would be the wisest choice for part of my webstack. Right now I'm trying to decide whether I should develop upon nginx, using PHP to deliver the dynamic content, or use nginx as a proxy to Tomcat and use servlets to deliver the dynamic content. I have a good amount of experience with Java, JSP, and servlets, so that's a plus right off the bat. Also, since it is a compiled language, it will execute faster than PHP (it is implied here that Java is around 37x faster than PHP) , and will create the web pages faster. I have no experience with PHP, however i'm under the impression that it is easy to pick up. It's slower than Java, but since the client will only be communicating with nginx, I'm thinking that serving the dynamically created web pages to the client will be faster this way. Considering these things, i'd like to know: Are my assumptions correct? Where does the bottleneck occur: creating pages or serving them back to the client? Will proxying Tomcat with nginx give me any of nginx performance benefits if I'm going to be using Tomcat to generate the dynamic content (keeping in mind my site is going to be heavy in this aspect)? I don't mind learning PHP if, in the end, its going to give me the best performance. I just want to know what would be the best choice from that standpoint.

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  • How to troubleshoot this memory usage?

    - by Camran
    I have a classifieds website. I use PHP, MySql, and SOLR. Solr uses a Servlet Container, in my case JETTY, which is java application. I just noticed that something was terribly wrong on my website. I opened the terminal and entered the "top" command and noticed that JAVA was EATING all the cpu and mem. Now I thought "Ok, maybe I need more mem and cpu" So I increased it. But along with the increase the java app started eating more. This has never happened before, and it is either a bug, or a hack of some kind. Anyways, I need to troubleshoot this now, and so I wonder how do I do this? Can I somehow pinpoint exactly when the memory usage started to go up from some error log? How does one troubleshoot this? How do I prevent it? Is it possible to prevent too many requests somehow, if they are within a timeline? Thanks

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  • Resolve a URL from a Partial View (ASP.NET MVC)

    Working on an ASP.NET MVC application and needed the ability to resolve a URL from a partial view. For example, I have an image I want to display, but I need to resolve the virtual path (say, ~/Content/Images/New.png) into a relative path that the browser can use, such as ../../Content/Images/New.png or /MyAppName/Content/Images/New.png. Astandard view derives from the System.Web.UI.Page class, meaning you have access to the ResolveUrl and ResolveClientUrl methods. Consequently, you can write markup/code like the following:' /The problem is that the above code does not work as expected in a partial view. What's a little confusing is that while the above code compiles and the page, when visited through a browser, renders, the call to Page.ResolveClientUrl returns precisely what you pass in, ~/Content/Images/New.png, in this instance. The browser doesn't know what to do with ~, it presumes it's part of the URL, so it sends the request to the server for the image with the ~ in the URL, which results in a broken image.I did a bit of searching online and found this handy tip from Stephen Walther - Using ResolveUrl in an HTML Helper. In a nutshell, Stephen shows how to create an extension method for the HtmlHelper class that uses the UrlHelper class to resolve a URL. Specifically, Stephen shows how to add an Image extension method to HtmlHelper. I incorporated Stephen's code into my codebase and also created a more generic extension method, which I named ResolveUrl.public static MvcHtmlString ResolveUrl(this HtmlHelper htmlHelper, string url) { var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext); return MvcHtmlString.Create(urlHelper.Content(url)); }With this method in place you can resolve a URL in a partial view like so:' /Or you could use Stephen's Html.Image extension method (althoughmy more generic Html.ResolveUrl method could be used in non-image related scenarios where you needed to get a relative URL from a virtual one in a partial view). Thanks for the helpful tip, Stephen!Happy Programming!Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Resolve a URL from a Partial View (ASP.NET MVC)

    Working on an ASP.NET MVC application and needed the ability to resolve a URL from a partial view. For example, I have an image I want to display, but I need to resolve the virtual path (say, ~/Content/Images/New.png) into a relative path that the browser can use, such as ../../Content/Images/New.png or /MyAppName/Content/Images/New.png. Astandard view derives from the System.Web.UI.Page class, meaning you have access to the ResolveUrl and ResolveClientUrl methods. Consequently, you can write markup/code like the following:' /The problem is that the above code does not work as expected in a partial view. What's a little confusing is that while the above code compiles and the page, when visited through a browser, renders, the call to Page.ResolveClientUrl returns precisely what you pass in, ~/Content/Images/New.png, in this instance. The browser doesn't know what to do with ~, it presumes it's part of the URL, so it sends the request to the server for the image with the ~ in the URL, which results in a broken image.I did a bit of searching online and found this handy tip from Stephen Walther - Using ResolveUrl in an HTML Helper. In a nutshell, Stephen shows how to create an extension method for the HtmlHelper class that uses the UrlHelper class to resolve a URL. Specifically, Stephen shows how to add an Image extension method to HtmlHelper. I incorporated Stephen's code into my codebase and also created a more generic extension method, which I named ResolveUrl.public static MvcHtmlString ResolveUrl(this HtmlHelper htmlHelper, string url) { var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext); return MvcHtmlString.Create(urlHelper.Content(url)); }With this method in place you can resolve a URL in a partial view like so:' /Or you could use Stephen's Html.Image extension method (althoughmy more generic Html.ResolveUrl method could be used in non-image related scenarios where you needed to get a relative URL from a virtual one in a partial view). Thanks for the helpful tip, Stephen!Happy Programming!Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • SecurityException when accessing (ejb2-) session bean via local interface in JBoss 5

    - by sme
    I have the following problem with an EJB 2 SessionBean when deploying in JBoss 5: The SessionBean (called LVSKeepAliveDispatcher) requires a specific user role (called "LVSUser"), specified by <method-permission > <description></description> <role-name>LVSUser</role-name> <method > <description></description> <ejb-name>LVSKeepAliveDispatcher</ejb-name> <method-name>*</method-name> </method> </method-permission> in ejb-jar.xml. I now want to access this SessionBean from a Service (i.e. a class implementing the org.jboss.varia.scheduler.Schedulable interface that is then registered as a service) running inside the same JBoss instance. This is my jboss-service.xml: <server> <mbean code="org.jboss.varia.scheduler.Scheduler" name="lvs:service=TranslationService"> <attribute name="StartAtStartup">true</attribute> <attribute name="SchedulableClass">de.repower.lvs.server.service.translation.TranslationService</attribute> <attribute name="SchedulableArguments"></attribute> <attribute name="SchedulableArgumentTypes"></attribute> <attribute name="InitialStartDate">NOW</attribute> <attribute name="SchedulePeriod">60000</attribute> <attribute name="InitialRepetitions">1</attribute> <attribute name="TimerName">jboss:service=Timer,name=TranslationServiceTimer</attribute> <depends><mbean code="javax.management.timer.Timer" name="jboss:service=Timer,name=TranslationServiceTimer"/></depends> <depends>jboss.j2ee:service=EJB,jndiName=de/repower/lvs/i18n/sessionbeans/LVSTranslation</depends> </mbean> As the service is deployed in the same vm as the session bean I want to call the session bean via the local interface, but I get a SecurityException when I try to create an instance. When instead I do a lookup of the RemoteInterface it works. This is the code inside the perform method of my service class: public void perform(Date now, long remainingRepetitions) { try { final UsernamePasswordHandler handler = new UsernamePasswordHandler(USERNAME, PASSWORD); final LoginContext lc = new LoginContext("client-login", handler); lc.login(); // Trying to instantiate an LVSKeepAliveDispatcher via remote interface // This part works LVSKeepAliveDispatcher localvHome = LVSKeepAliveDispatcherUtil.getHome().create(); LOGGER.info("Successfully instantiated an LVSKeepAliveDispatcher " + localvHome.toString()); // Trying to instantiate an LVSKeepAliveDispatcherLocal via local interface LVSKeepAliveDispatcherLocal localvLocalHome = LVSKeepAliveDispatcherUtil.getLocalHome().create(); // this code is unforunately never reached LOGGER.info("Successfully instantiated an LVSKeepAliveDispatcherLocal " + localvLocalHome.toString()); lc.logout(); } catch (final Exception ex) { LOGGER.error("Error: ", ex); } } Exception: 2009-02-17 10:38:02,266 INFO [lvsi18n] (Timer-2) Successfully instantiated an LVSKeepAliveDispatcher de/repower/lvs/server/service/alive/sessionbeans/LVSKeepAliveDispatcher:Stateless 2009-02-17 10:38:02,297 ERROR [org.jboss.ejb.plugins.SecurityInterceptor] (Timer-2) Error in Security Interceptor java.lang.SecurityException: Authentication exception, principal=internalSystemUser at org.jboss.ejb.plugins.SecurityInterceptor.checkSecurityContext(SecurityInterceptor.java:321) at org.jboss.ejb.plugins.SecurityInterceptor.process(SecurityInterceptor.java:243) at org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:205) at org.jboss.ejb.plugins.security.PreSecurityInterceptor.process(PreSecurityInterceptor.java:136) at org.jboss.ejb.plugins.security.PreSecurityInterceptor.invokeHome(PreSecurityInterceptor.java:88) at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:132) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invokeHome(ProxyFactoryFinderInterceptor.java:107) at org.jboss.ejb.SessionContainer.internalInvokeHome(SessionContainer.java:639) at org.jboss.ejb.Container.invoke(Container.java:1046) at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invokeHome(BaseLocalProxyFactory.java:362) at org.jboss.ejb.plugins.local.LocalHomeProxy.invoke(LocalHomeProxy.java:133) at $Proxy193.create(Unknown Source) at de.repower.lvs.server.service.translation.TranslationService.perform(TranslationService.java:68) at org.jboss.varia.scheduler.Scheduler$PojoScheduler.invoke(Scheduler.java:1267) at org.jboss.varia.scheduler.Scheduler$BaseListener.handleNotification(Scheduler.java:1235) at sun.reflect.GeneratedMethodAccessor281.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.mx.notification.NotificationListenerProxy.invoke(NotificationListenerProxy.java:153) at $Proxy87.handleNotification(Unknown Source) at javax.management.NotificationBroadcasterSupport.handleNotification(NotificationBroadcasterSupport.java:257) at javax.management.NotificationBroadcasterSupport$SendNotifJob.run(NotificationBroadcasterSupport.java:322) at javax.management.NotificationBroadcasterSupport$1.execute(NotificationBroadcasterSupport.java:307) at javax.management.NotificationBroadcasterSupport.sendNotification(NotificationBroadcasterSupport.java:229) at javax.management.timer.Timer.sendNotification(Timer.java:1234) at javax.management.timer.Timer.notifyAlarmClock(Timer.java:1203) at javax.management.timer.TimerAlarmClock.run(Timer.java:1286) at java.util.TimerThread.mainLoop(Timer.java:512) at java.util.TimerThread.run(Timer.java:462) To further diagnose the error I debugged through the SecurityInterceptor and found that in the first case (successful creating an instance via the remote interface) the security context "lvs-security" (which I defined in login-config.xml) is being used whereas in the second case (failure when creating an instance via the local interface) the generic security context "CLIENT-LOGIN" is being used. This is the definition of the securit context "lvs-security" in login-config.xml: <application-policy name = "lvs-security"> <authentication> <login-module code = "org.jboss.security.ClientLoginModule" flag = "required"> </login-module> <login-module code = "de.repower.lvs.security.UsersRolesLoginModule" flag = "sufficient"> </login-module> <login-module code = "de.repower.lvs.security.login.LVSLoginModule" flag = "required"> <module-option name = "lvs-jboss-host">localhost</module-option> <module-option name = "lvs-jboss-jndi-port">1099</module-option> </login-module> </authentication> </application-policy> I'm now kind of stuck and hope someone can give me a hint about where to further look for the cause of the problem. This worked fine in JBoss 3.2.7. Edit: My current workaround for this problem: create a new container configuration in jboss.xml and remove the security interceptor stuff from this configuration use this newly created container configuration for all my session beans that I only use locally (i.e. via local interface).

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  • Java2Days 2012 Trip Report

    - by reza_rahman
    Java2Days 2012 was held in beautiful Sofia, Bulgaria on October 25-26. For those of you not familiar with it, this is the third installment of the premier Java conference for the Balkan region. It is an excellent effort by admirable husband and wife team Emo Abadjiev and Iva Abadjieva as well as the rest of the Java2Days team including Yoana Ivanova and Nadia Kostova. Thanks to their hard work, the conference continues to grow vigorously with almost a thousand enthusiastic, bright young people attending this year and no less than three tracks on Java, the Cloud and Mobile. The conference is a true gem in this region of the world and I am very proud to have been a part of it again, along with the other world class speakers the event rightfully attracts. It was my honor to present the first talk of the conference. It was a full-house session on Java EE 7 and 8 titled "JavaEE.Next(): Java EE 7, 8, and Beyond". The talk was primarily along the same lines as Arun Gupta's JavaOne 2012 technical keynote. I covered the changes in JMS 2, the Java API for WebSocket (JSR 356), the Java API for JSON Processing (JSON-P), JAX-RS 2, JCache, JPA 2.1, JTA 1.2, JSF 2.2, Java Batch, Bean Validation 1.1 and the rest of the APIs in Java EE 7. I also briefly talked about the possible contents of Java EE 8. My stretch goal was to gather some feedback on some open issues in the Java EE EG (more on that soon) but I ran out of time in the short format forty-five minute session. The talk was received well and I had some pretty good discussions afterwards. The slides for the talk are here: JavaEE.Next(): Java EE 7, 8, and Beyond from reza_rahman To my delight, the Java2Days folks were very interested in my domain-driven design/Java EE 6 talk (titled "Domain Driven Design with Java EE 6"). I've had this talk in my inventory for a long time now but it always gets overridden by less theoretical talks on APIs, tools, etc. The talk has three parts -- a brief overview of DDD theory, mapping DDD to Java EE and actual running DDD code in Java EE 6/GlassFish. For the demo, I converted the well-known DDD sample application (http://dddsample.sourceforge.net/) written mostly in Spring 2 and Hibernate 2 to Java EE 6. My eventual plan is to make the code available via a top level java.net project. Even despite the broad topic and time constraints, the talk went very well. It was a full house, the Q & A was excellent and one of the other speakers even told me they thought this was the best talk of the conference! The slides for the talk are here: Domain Driven Design with Java EE 6 from Reza Rahman The code examples are available here: https://blogs.oracle.com/reza/resource/dddsample.zip for now, as a simple zip file. Give me a shout if you would like to get it up and running. It was also a great honor to present the last session of the conference. It was a talk on the Java API for WebSocket/JSR 356 titled "Building HTML5/WebSocket Applications with JSR 356 and GlassFish". The talk is based on Danny Coward's JavaOne 2012 talk. The talk covers the basic of WebSocket, the JSR 356 API and a simple demo using Tyrus/GlassFish. The talk went very well and there were some very good questions afterwards. The slides for the talk are here: Building HTML5/WebSocket Applications with GlassFish and JSR 356 from Reza Rahman The code samples are available here: https://blogs.oracle.com/arungupta/resource/totd183-HelloWebSocket.zip. You'll need the latest promoted GlassFish 4 build to run the code. Give me a shout if you need help. Besides presenting my talks, I got to attend some great sessions on OSGi, HTML5, cloud, agile and Java 8. I got an invite to speak at the Macedonia JUG when possible. Victor Grazi of InfoQ wrote about my sessions and Java2Days here: http://www.infoq.com/news/2012/11/Java2DaysConference. Stoyan Rachev was very kind to blog about my sessions here: http://www.stoyanr.com/2012/11/java2days-2012-java-ee.html. I definitely enjoyed Java2Days 2012 and hope to be part of the conference next year!

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  • Problem deploying servlets in JBoss 5.1 on eclipse.

    - by Jeremy Goodell
    Yesterday I created a simple image servlet and attempted to deploy it. I am getting an error on JBoss startup, and then further errors on trying to invoke the servlet. I spent about 8 hours yesterday searching the web for answers and trying different scenarios. I ended up making my JBoss problems worse and then fixing them, but I never did get the servlet to work. The servlet is com.controller.MyImageServlet, and looks like this: package com.controller; import javax.servlet.http.*; /** * Servlet implementation class MyImageServlet */ public class MyImageServlet extends HttpServlet { private static final long serialVersionUID = 1L; public MyImageServlet() { super(); } // Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* ... */ } } The tags I've added to web.xml looks like this: <servlet> <servlet-name>ImageServlet</servlet-name> <servlet-class>com.controller.MyImageServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ImageServlet</servlet-name> <url-pattern>/CERTIMAGE/*</url-pattern> </servlet-mapping> On server startup, this is the only indication in the log that something is amiss: 01:59:25,328 WARN [JAXWSDeployerHookPreJSE] Cannot load servlet class: com.controller.MyImageServlet When I try the URL pattern (http://localhost:9980/CERTIMAGE/1), I get the following stack trace in the log (and in the Browser): 01:59:39,640 INFO [[/]] Marking servlet ImageServlet as unavailable 01:59:39,640 ERROR [[ImageServlet]] Allocate exception for servlet ImageServlet java.lang.ClassNotFoundException: com.controller.MyImageServlet at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:262) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:256) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1006) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:777) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) If I try the URL pattern again, I get the following message in the log: 09:33:32,390 INFO [[ImageServlet]] Servlet ImageServlet is currently unavailable I have verified that MyImageServlet.class is in the WAR at WEB-INF/classes/com/controller/images. As a matter of fact, I even added some code to one of my JSPs to attempt to instantiate the Servlet and call the doGet method. This actually works and outputs the correct debug sequences to the log indicating that the Servlet constructor and doGet methods were called. I also tried following some instructions for creating/deploying a very simple HelloWorld servlet, and that has exactly the same problem. Note that web.xml already contained a servlet put there by JBoss: org.jboss.web.tomcat.service.StatusServlet -- that Servlet does not give any errors in the log. As an experiment, I removed ".web" from that path and ended up getting exactly the same error as I'm getting on my Servlet. So it would appear that JBoss is not able to locate my Servlet given the specified path. Just for kicks, I've tried all sorts of other paths, like just plain MyImageServlet, controller.MyImageServlet, and more. Also, the servlet was originally named ImageServlet, but I attempted the name change thinking maybe there was some conflict with an existing ImageServlet. In all cases, the behavior is the same. After all of my research yesterday, I would say that this appears to be a problem with the JBoss servlet container, and I also learned that JBoss 5.1.0.GA should come bundled with a tomcat servlet container. I installed JBoss on my PC (Windows XP) myself less than 2 months ago (from jboss.org) and used it pretty much as is. Note that I am running on JDK 1.6, so I did use the jboss-jdk6 installation version. I am running on Windows, but I also deploy to a Linux virtual dedicated server. I deployed the current version of my program, including the servlet to the Linux box, but I get the exact same errors. I'm reluctant to just try reinstalling JBoss, since it's hard to place the blame on the JBoss installation when I get the same errors on two completely different installations. I am a bit suspicious of the bundled tomcat servlet container, because using eclipse, I haven't been able to locate any indication that there is a tomcat bundled into JBoss. I did locate servlet-api.jar in the JBoss common/lib directory. This is on the eclipse build path. One possibly useful note: I had previously used a standalone tomcat server for other projects using the same eclipse, so maybe it's some sort of eclipse issue? But, as I said, I do get the same errors when I deploy to the Linux server, and that deployment process just involves ftping files to the server and then putting them into the deployed war package and restarting JBoss. Thanks for any help you can provide.

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  • JavaDay Taipei 2014 Trip Report

    - by reza_rahman
    JavaDay Taipei 2014 was held at the Taipei International Convention Center on August 1st. Organized by Oracle University, it is one of the largest Java developer events in Taiwan. This was another successful year for JavaDay Taipei with a fully sold out venue packed with youthful, energetic developers (this was my second time at the event and I have already been invited to speak again next year!). In addition to Oracle speakers like me, Steve Chin and Naveen Asrani, the event also featured a bevy of local speakers including Taipei Java community leaders. Topics included Java SE, Java EE, JavaFX, cloud and Big Data. It was my pleasure and privilege to present one of the opening keynotes for the event. I presented my session on Java EE titled "JavaEE.Next(): Java EE 7, 8, and Beyond". I covered the changes in Java EE 7 as well as what's coming in Java EE 8. I demoed the Cargo Tracker Java EE BluePrints. I also briefly talked about Adopt-a-JSR for Java EE 8. The slides for the keynote are below (click here to download and view the actual PDF): It appears your Web browser is not configured to display PDF files. No worries, just click here to download the PDF file. In the afternoon I did my JavaScript + Java EE 7 talk titled "Using JavaScript/HTML5 Rich Clients with Java EE 7". This talk is basically about aligning EE 7 with the emerging JavaScript ecosystem (specifically AngularJS). The talk was completely packed. The slide deck for the talk is here: JavaScript/HTML5 Rich Clients Using Java EE 7 from Reza Rahman The demo application code is posted on GitHub. The code should be a helpful resource if this development model is something that interests you. Do let me know if you need help with it but the instructions should be fairly self-explanatory. I am delivering this material at JavaOne 2014 as a two-hour tutorial. This should give me a little more bandwidth to dig a little deeper, especially on the JavaScript end. I finished off Java Day Taipei with my talk titled "Using NoSQL with ~JPA, EclipseLink and Java EE" (this was the last session of the conference). The talk covers an interesting gap that there is surprisingly little material on out there. The talk has three parts -- a birds-eye view of the NoSQL landscape, how to use NoSQL via a JPA centric facade using EclipseLink NoSQL, Hibernate OGM, DataNucleus, Kundera, Easy-Cassandra, etc and how to use NoSQL native APIs in Java EE via CDI. The slides for the talk are here: Using NoSQL with ~JPA, EclipseLink and Java EE from Reza Rahman The JPA based demo is available here, while the CDI based demo is available here. Both demos use MongoDB as the data store. Do let me know if you need help getting the demos up and running. After the event the Oracle University folks hosted a reception in the evening which was very well attended by organizers, speakers and local Java community leaders. I am extremely saddened by the fact that this otherwise excellent trip was scarred by terrible tragedy. After the conference I joined a few folks for a hike on the Maokong Mountain on Saturday. The group included friends in the Taiwanese Java community including Ian and Robbie Cheng. Without warning, fatal tragedy struck on a remote part of the trail. Despite best efforts by us, the excellent Taiwanese Emergency Rescue Team and World class Taiwanese physicians we were unable to save our friend Robbie Cheng's life. Robbie was just thirty-four years old and is survived by his younger brother, mother and father. Being the father of a young child myself, I can only imagine the deep sorrow that this senseless loss unleashes. Robbie was a key member of the Taiwanese Java community and a Java Evangelist at Sun at one point. Ironically the only picture I was able to take of the trail was mere moments before tragedy. I thought I should place him in that picture in profoundly respectful memoriam: Perhaps there is some solace in the fact that there is something inherently honorable in living a bright life, dying young and meeting one's end on a beautiful remote mountain trail few venture to behold let alone attempt to ascend in a long and tired lifetime. Perhaps I'd even say it's a fate I would not entirely regret facing if it were my own. With that thought in mind it seems appropriate to me to quote some lyrics from the song "Runes to My Memory" by legendary Swedish heavy metal band Amon Amarth idealizing a fallen Viking warrior cut down in his prime: "Here I lie on wet sand I will not make it home I clench my sword in my hand Say farewell to those I love When I am dead Lay me in a mound Place my weapons by my side For the journey to Hall up high When I am dead Lay me in a mound Raise a stone for all to see Runes carved to my memory" I submit my deepest condolences to Robbie's family and hope my next trip to Taiwan ends in a less somber note.

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