Multiple deployed modules using log4j log to same file

We have deployed two modules in ias 6.5 Solaris - moduleA and moduleB. Each of these modules uses log4j to write to a log file - logA and logB. Each module includes logj4.jar in it's WEB-INF/lib directory and the classes are unzipped upon deployment into an org/apache/log4j directory under each module.
Upon app server startup, neither module is loaded. A request is sent to /NASApp/moduleA. logA is written to as the module is initialized. A request is then sent to /NASApp/moduleB. logB is written to as the module in initialized. A request is then sent to /NASApp/moduleA again. This request should be logged in logA but is instead written to logB.
This happened in ias 6.0 sp3 as well as ias 6.5.
An attempt to determine the source of the problem:
The /APPS/modules/moduleB/WEB-INF/lib/org/apache/log4j directory was removed. This should cause ClassNotFoundExceptions to be thrown when attempts are made to write to log4j from moduleB. The appserver is first stopped, then killed, then started again - neither module is loaded. A request is sent to /NASApp/moduleA. logA is written to as the module is initialized. A request is then sent to /NASApp/moduleB - a request that should result in ClassNotFoundExceptions being thrown because the log4j classes are no longer present in the module's classpath. Instead, logB is written and everything behaves as was described above.
Based on this test, we believe that the root of this problem is once again a class loader issue. Apparently, the log4j classes are being loaded by a class loader that is shared between both moduleA and moduleB. Normally this would not cause a problem, but in the case of log4j, the target log file is being overwritten and causes the log entries to be shared between the two modules.
What must we do to remedy this problem? At present, the only fix we know will work is to run a separate appserver instance for each module - a solution that is not acceptable due to the amount of resources consumed by all of the deployed code.

Hi,
You are correct it is a classloader problem, in sp4/6.5 you have a separate classloader for each module (war/jar) but all the helping classes inside modules share a single classloader, that's why even after deleting the helping files from ModuleB it was working.
The remedy to your problem is to create ear module out of those ModuleA and ModuleB and put the helping jar files in both of the ear modules. For ias an ear file is an J2EE application and a separate classloader instance is dedicated to it, it holds true for all the helping classes in the ear module too and the helping classes in two J2EE application (ear module) no longer share the classloader.
I hope it will solve your problem. For further information regarding classloaders please visit Classloader runtime hierarchy.
Please feel free to ask further questions.
Sanjeev,
Developer Support, Sun ONE Application Server-India.

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     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@70b01a for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Logger) (Caused by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@70b01a for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Logger))
     at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
     at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
     at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
     at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
     at org.apache.axis2.transport.http.AxisServlet.<clinit>(AxisServlet.java:83)
     ... 50 more
Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@70b01a for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Logger)
     at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:413)
     at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
     ... 54 more
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Logger
     at java.lang.Class.getDeclaredConstructors0(Native Method)
     at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
     at java.lang.Class.getConstructor0(Class.java:2699)
     at java.lang.Class.getConstructor(Class.java:1657)
     at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)
     ... 55 moreThanks

Go to Environments >> servers>> adminServer >> logging >> advanced
change the default JDK logging to log4j
by default weblogic provides two types of logging JDK and log4j

Multiple deployed modules using log4j log to same file

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