When restarting eclipse, it rebuilds the whole workspace and I encounter the following error:

Errors occurred during the build.
Errors running builder 'JAX-RS Builder' on project 'some-project-name'.
org.eclipse.jdt.internal.core.TypeParameter cannot be cast to org.eclipse.jdt.core.IType

Looking at the logs, I found the following:
!ENTRY org.eclipse.core.resources 4 75 2011-09-29 18:28:26.111
!MESSAGE Errors occurred during the build.
!SUBENTRY 1 org.jboss.tools.ws.jaxrs.core 4 75 2011-09-29 18:28:26.111
!MESSAGE Errors running builder 'JAX-RS Builder' on project 'some-project-name'.
!STACK 0
java.lang.ClassCastException: org.eclipse.jdt.internal.core.TypeParameter cannot be cast to org.eclipse.jdt.core.IType
at org.jboss.tools.ws.jaxrs.core.metamodel.ResourceMethod.merge(ResourceMethod.java:103)
at org.jboss.tools.ws.jaxrs.core.metamodel.ResourceMethod.<init>(ResourceMethod.java:58)
at org.jboss.tools.ws.jaxrs.core.metamodel.Resource.mergeMethods(Resource.java:210)
at org.jboss.tools.ws.jaxrs.core.metamodel.Resource.merge(Resource.java:160)
at org.jboss.tools.ws.jaxrs.core.metamodel.Resource$ResourceBuilder.build(Resource.java:101)
at org.jboss.tools.ws.jaxrs.core.metamodel.Resources.addFrom(Resources.java:53)
at org.jboss.tools.ws.jaxrs.core.metamodel.Metamodel.addElements(Metamodel.java:221)
at org.jboss.tools.ws.jaxrs.core.internal.builder.JaxrsMetamodelBuilder.fullBuild(JaxrsMetamodelBuilder.java:184)
at org.jboss.tools.ws.jaxrs.core.internal.builder.JaxrsMetamodelBuilder.build(JaxrsMetamodelBuilder.java:92)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

Not sure what other information may be important here, so please let me know.