JBoss Tools 3.1.1ではメソッド名の変更リファクタリングができない

以前からなんとなく気になっていたのですが、やはりJBossTools上でメソッド名を変更するリファクタリングを実行しようとしても、内部エラーなって変更できません。以下の例外が発生してしまい、名称変更がロールバックされてしまいます。

eclipse.buildId=unknown
java.version=1.6.0_21
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=ja_JP
Framework arguments:  -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.jee.product -clean

エラー
Sun Oct 03 13:21:39 JST 2010
内部エラー

java.lang.reflect.InvocationTargetException
at org.eclipse.jdt.internal.ui.actions.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:110)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Caused by: Java Model Exception: Java Model Status [1.0.com.sun.codemodel [in D:\dev\tools\jboss-5.1.0.GA\client\jaxb-xjc.jar] は存在しません]
at org.eclipse.jdt.internal.core.JavaElement.newJavaModelException(JavaElement.java:502)
at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:246)
at org.eclipse.jdt.internal.core.Openable.openAncestors(Openable.java:504)
at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:240)
at org.eclipse.jdt.internal.core.SourceRefElement.generateInfos(SourceRefElement.java:107)
at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:515)
at org.eclipse.jdt.internal.core.BinaryType.getElementInfo(BinaryType.java:285)
at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:238)
at org.eclipse.jdt.internal.core.BinaryType.isInterface(BinaryType.java:722)
at org.eclipse.jdt.internal.corext.refactoring.rename.RippleMethodFinder2.findAllRippleMethods(RippleMethodFinder2.java:242)
at org.eclipse.jdt.internal.corext.refactoring.rename.RippleMethodFinder2.getAllRippleMethods(RippleMethodFinder2.java:168)
at org.eclipse.jdt.internal.corext.refactoring.rename.RippleMethodFinder2.getRelatedMethods(RippleMethodFinder2.java:161)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameMethodProcessor.initializeMethodsToRename(RenameMethodProcessor.java:236)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameMethodProcessor.doCheckFinalConditions(RenameMethodProcessor.java:360)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameVirtualMethodProcessor.doCheckFinalConditions(RenameVirtualMethodProcessor.java:143)
at org.eclipse.jdt.internal.corext.refactoring.rename.JavaRenameProcessor.checkFinalConditions(JavaRenameProcessor.java:46)
at org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring.checkFinalConditions(ProcessorBasedRefactoring.java:224)
at org.eclipse.ltk.core.refactoring.Refactoring.checkAllConditions(Refactoring.java:160)
at org.eclipse.jdt.internal.ui.refactoring.RefactoringExecutionHelper$Operation.run(RefactoringExecutionHelper.java:80)
at org.eclipse.jdt.internal.core.BatchOperation.executeOperation(BatchOperation.java:39)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)
at org.eclipse.jdt.core.JavaCore.run(JavaCore.java:4694)
at org.eclipse.jdt.internal.ui.actions.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:106)
... 1 more
Root exception:
Java Model Exception: Java Model Status [1.0.com.sun.codemodel [in D:\dev\tools\jboss-5.1.0.GA\client\jaxb-xjc.jar] は存在しません]
at org.eclipse.jdt.internal.core.JavaElement.newJavaModelException(JavaElement.java:502)
at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:246)
at org.eclipse.jdt.internal.core.Openable.openAncestors(Openable.java:504)
at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:240)
at org.eclipse.jdt.internal.core.SourceRefElement.generateInfos(SourceRefElement.java:107)
at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:515)
at org.eclipse.jdt.internal.core.BinaryType.getElementInfo(BinaryType.java:285)
at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:238)
at org.eclipse.jdt.internal.core.BinaryType.isInterface(BinaryType.java:722)
at org.eclipse.jdt.internal.corext.refactoring.rename.RippleMethodFinder2.findAllRippleMethods(RippleMethodFinder2.java:242)
at org.eclipse.jdt.internal.corext.refactoring.rename.RippleMethodFinder2.getAllRippleMethods(RippleMethodFinder2.java:168)
at org.eclipse.jdt.internal.corext.refactoring.rename.RippleMethodFinder2.getRelatedMethods(RippleMethodFinder2.java:161)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameMethodProcessor.initializeMethodsToRename(RenameMethodProcessor.java:236)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameMethodProcessor.doCheckFinalConditions(RenameMethodProcessor.java:360)
at org.eclipse.jdt.internal.corext.refactoring.rename.RenameVirtualMethodProcessor.doCheckFinalConditions(RenameVirtualMethodProcessor.java:143)
at org.eclipse.jdt.internal.corext.refactoring.rename.JavaRenameProcessor.checkFinalConditions(JavaRenameProcessor.java:46)
at org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring.checkFinalConditions(ProcessorBasedRefactoring.java:224)
at org.eclipse.ltk.core.refactoring.Refactoring.checkAllConditions(Refactoring.java:160)
at org.eclipse.jdt.internal.ui.refactoring.RefactoringExecutionHelper$Operation.run(RefactoringExecutionHelper.java:80)
at org.eclipse.jdt.internal.core.BatchOperation.executeOperation(BatchOperation.java:39)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)
at org.eclipse.jdt.core.JavaCore.run(JavaCore.java:4694)
at org.eclipse.jdt.internal.ui.actions.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:106)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

クラスパス内にあるjaxb-xjc.jarというファイルが関係していそうとのことなのですが、単純にこのファイルを削除すると一応解消されるようです。
https://bugs.eclipse.org/bugs/show_bug.cgi?id=293861
https://jira.jboss.org/browse/JBIDE-5036
ちなみに、JBossTools 3.2.0M2では修正されているようです。しかし、このバージョンはエンティティクラスの自動生成ができないという問題が残っており、あっちをたてればこっちがたたずという状態です。