Description Gunnar Wagenknecht 2004-10-21 06:26:15 EDT

We have a job that looks through a project to find all types inheriting from a 
specific class to build a model. For this purpose it uses 
IJavaProject#isOnClasspath. This job is executed with our own rule to prevent 
concurrency issues.

Sometimes we get an IllegalArgumentException "Attempted to beginRule: R/, does 
not match outer scope rule: My Loading Model Rule" while calling 
IJavaProject#isOnClasspath. The problem turns out to be a container 
initialization. JavaCore#setClasspathContainer wants to lock the complete 
workspace.

The problem we have now is what to do? We can't include the COMPLETE workspace 
rule into our own rule. Furthermore are API clients of 
IJavaProject#isOnClasspath expected to lock the whole workspace?

This is the detailed stack trace:

java.lang.IllegalArgumentException: Attempted to beginRule: R/, does not match 
outer scope rule: My Loading Model Rule
 at org.eclipse.core.internal.runtime.Assert.isLegal(Assert.java:58)
 at org.eclipse.core.internal.jobs.ThreadJob.illegalPush(ThreadJob.java:106)
 at org.eclipse.core.internal.jobs.ThreadJob.push(ThreadJob.java:200)
 at org.eclipse.core.internal.jobs.ImplicitJobs.begin(ImplicitJobs.java:80)
 at org.eclipse.core.internal.jobs.JobManager.beginRule(JobManager.java:170)
 at org.eclipse.core.internal.resources.WorkManager.checkIn
(WorkManager.java:95)
 at org.eclipse.core.internal.resources.Workspace.prepareOperation
(Workspace.java:1628)
 at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1668)
 at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation
(JavaModelOperation.java:744)
 at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath
(JavaProject.java:2650)
 at org.eclipse.jdt.core.JavaCore$3.run(JavaCore.java:3433)
 at org.eclipse.jdt.internal.core.BatchOperation.executeOperation
(BatchOperation.java:34)
 at org.eclipse.jdt.internal.core.JavaModelOperation.run
(JavaModelOperation.java:700)
 at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1673)
 at org.eclipse.jdt.core.JavaCore.run(JavaCore.java:3246)
 at org.eclipse.jdt.core.JavaCore.setClasspathContainer(JavaCore.java:3416)
 at org.eclipse.jdt.internal.launching.JREContainerInitializer.initialize
(JREContainerInitializer.java:51)
 at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer
(JavaModelManager.java:1261)
 at org.eclipse.jdt.internal.core.JavaModelManager.initializeAllContainers
(JavaModelManager.java:1226)
 at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer
(JavaModelManager.java:833)
 at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:1184)
 at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath
(JavaProject.java:1888)
 at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath
(JavaProject.java:1798)
 at org.eclipse.jdt.internal.core.JavaProject.isOnClasspath
(JavaProject.java:2130)
 at my.custom.code.MyRegistry.findMySpecialClassesInFolder()