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From "Witham, Darren (Contractor)" <wit...@bp.com>
Subject Custom Task Error
Date Thu, 06 Mar 2003 17:13:38 GMT

Hi,

  I am working with a very large generated build file and have had the need to write an Ant
task to ping Weblogic and continue when it is up.

  I have written a simple user task that has about 3 lines in the execute method. I have made
use of a Weblogic class to connect to the server (T3Client). This code works fine when I just
run it from my IDE however when I run it as an Ant task i.e set up task in build file and
invoke it - the code doesn't work. I am supplying the correct classpath's etc as the stacktrace
shows the error occuring within the T3Client code...

[wlping] java.lang.ExceptionInInitializerError: java.lang.NullPointerException
[wlping]     at weblogic.utils.classloaders.ServletClassFinder.<init>(ServletClassFinder.java:32)
[wlping]     at weblogic.j2ee.ApplicationManager.getFinder(ApplicationManager.java:283)
[wlping]     at weblogic.j2ee.ApplicationManager.loadFromNetwork(ApplicationManager.java:261)
[wlping]     at weblogic.j2ee.ApplicationManager.loadClass(ApplicationManager.java:194)
[wlping]     at weblogic.j2ee.ApplicationManager.loadClass(ApplicationManager.java:106)
[wlping]     at weblogic.rmi.internal.ClientRuntimeDescriptor.computeInterfaces(ClientRuntimeDescriptor.java:218)
[wlping]     at weblogic.rmi.internal.ClientRuntimeDescriptor.intern(ClientRuntimeDescriptor.java:111)
[wlping]     at weblogic.rmi.internal.dgc.DGCClientImpl.<clinit>(DGCClientImpl.java:66)
[wlping]     at weblogic.rmi.internal.RMIKernelService.initialize(RMIKernelService.java:13)
[wlping]     at weblogic.kernel.Kernel.initialize(Kernel.java:159)
[wlping]     at weblogic.kernel.Kernel.ensureInitialized(Kernel.java:101)
[wlping]     at weblogic.common.T3Client.<init>(T3Client.java:215)
[wlping]     at weblogic.common.T3Client.<init>(T3Client.java:263)
[wlping]     at weblogic.common.T3Client.<init>(T3Client.java:316)
[wlping]     at com.bp.ist.tools.wlping.WLPing.doPing(WLPing.java:88)
[wlping]     at com.bp.ist.tools.wlping.WLPing.execute(WLPing.java:158)
[wlping]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:104)
[wlping]     at org.apache.tools.ant.Task.perform(Task.java:217)
[wlping]     at org.apache.tools.ant.Target.execute(Target.java:184)
[wlping]     at org.apache.tools.ant.Target.performTasks(Target.java:202)
[wlping]     at org.apache.tools.ant.Project.executeTarget(Project.java:601)
[wlping]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:266)
[wlping]     at org.apache.tools.ant.Task.perform(Task.java:217)
[wlping]     at org.apache.tools.ant.Target.execute(Target.java:184)
[wlping]     at org.apache.tools.ant.Target.performTasks(Target.java:202)
[wlping]     at org.apache.tools.ant.Project.executeTarget(Project.java:601)
[wlping]     at org.apache.tools.ant.Project.executeTargets(Project.java:560)

It would appear to be some sort of path problem. I decided to call the code via <java classname="com.bp.ist.tools.wlping.WLPing">.
This works but I notice an  Ant classloader/nullpointer exception of some description occurs
unless I set fork="true" (which is no good for me).

Without knowing what the T3Client code does, are there any obvious reasons why working code
should fall over when placed in a user written task or why just running the code via <java...>
would appear to effect Ant after it returns unless it is run in another JVM ?

Thx

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