JBoss 4.2.2.GA - Deploying issue on class loading and out of memory

While deploying my applications with JBoss 4.2.2.GA, using JDK 1.5 I got some issue with class loading issue something like:

1. If meet such error:

org.jboss.deployment.DeploymentException: Error while fixing table name; - nested throwable: (org.jboss.util.NestedSQLException: Could not create connection; - nested throwable: (org.jboss.resource.JBossResourceException: Failed to register driver for: oracle.jdbc.driver.OracleDriver; - nested throwable: (java.lang.ClassNotFoundException: No ClassLoaders found for: oracle.jdbc.driver.OracleDriver)); - nested throwable: (org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (org.jboss.resource.JBossResourceException: Failed to register driver for: oracle.jdbc.driver.OracleDriver; - nested throwable: (java.lang.ClassNotFoundException: No ClassLoaders found for: oracle.jdbc.driver.OracleDriver))))

For sure, missing Oracle JDBC driver so Copy the Oracle JDBC Driver (10.2.0.1.0) (ojdbc14.jar) to lib folder of %JBOSS_HOME%/lib or at your server %JBOSS_HOME%/server/default/lib directory.

2. If something around:

2010-01-25 15:03:27,113 DEBUG [org.jboss.web.tomcat.service.TomcatDeployer] Classes needed for clustered webapp unavailable
java.lang.NoClassDefFoundError: org/jgroups/blocks/MethodCall
at org.jboss.web.tomcat.service.session.JBossCacheService.(JBossCacheService.java:70)
at org.jboss.web.tomcat.service.session.JBossCacheManager.init(JBossCacheManager.java:157)
at org.jboss.web.tomcat.service.TomcatDeployer.performDeployInternal(TomcatDeployer.java:336) 

So please try as following:

• Define a isolated classloader. To do it, change %JBOSS_HOME%/server/default/conf/jboss-service.xml :

<mbean code="org.jboss.naming.NamingService" name="jboss:service=Naming" dd="resource:xmdesc/NamingService-xmbean.xml">
[ ... ]
<attribute name="CallByValue">true</attribute>
[ ... ]
</mbean>

• change %JBOSS_HOME%/server/default/deploy/ear-deployer.xml :
  

<server>
[...]
<attribute name="Isolated">true</attribute>
[...]
<attribute name="CallByValue">true</attribute>
[...]
</server>

• change %JBOSS_HOME%/server/default/deploy/jboss-web.deployer/META-INF/jboss-service.xml :
  

[...]
<attribute name="Java2ClassLoadingCompliance">true</attribute>
[...]
<attribute name="UseJBossWebLoader">true</attribute>
[...]



3. When you wanna to deploy more than 2 applications on the same JBoss server instance, you may face some issues with unsuccessful deployment and with some error around Out of Memory.
So we need to increase memory allocation for Jboss, let's try to add/change JAVA_OPTS for memory allocation in file %JBOSS_HOME%/bin/run.bat as


set JAVA_OPTS=%JAVA_OPTS% -Xms512m -Xmx1024m -XX:MaxPermSize=128m

My applications are now deployed.

At BarCamp 2009, topic: The State of The Art of Web Development

Hi,
Here is my presentation at barcamp phnom penh 2009, on Sunday 4th of October at Pannasastra University (Norodom), in hall room, Room Phnom Tamao at 11:30am to 12:30pm.

It was about the state of the art of web development, wanna to express how web technologies going on since it was started and today; also a bit view on how the future is.

The presentation, it's just starting or a beginning of the topic. Among those points, parts related to technologies of Java/J2EE, Django/Ruby on Rails, PHP style coding need to improve in the presentation, hope to do it more in next part.

Enjoy here: