Java 在eclipse中添加动态webmodule时失败：nullpointer异常

我正试图在jbpm项目中添加web模块，但它给了我一个错误“安装动态web模块3.0-java.lang.NullpointerException时失败”

我的jdk版本是1.7_09，eclipse版本是开普勒。那么，出现这个错误有什么不对呢

Stacktrace

!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2014-02-19 14:41:25.210
!MESSAGE Failed while installing Dynamic Web Module 3.0.
!STACK 0
java.lang.NullPointerException
    at org.eclipse.jst.jee.model.internal.WebAnnotationReader.analyzeCompilationUnit(WebAnnotationReader.java:144)
    at org.eclipse.jst.jee.model.internal.WebAnnotationReader.loadModel(WebAnnotationReader.java:99)
    at org.eclipse.jst.jee.model.internal.common.AbstractAnnotationModelProvider.getConcreteModel(AbstractAnnotationModelProvider.java:111)
    at org.eclipse.jst.jee.model.internal.common.AbstractAnnotationModelProvider.getModelObject(AbstractAnnotationModelProvider.java:127)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadProviders(AbstractMergedModelProvider.java:265)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.access$2(AbstractMergedModelProvider.java:255)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider$LoadModelsWorkspaceRunnable.run(AbstractMergedModelProvider.java:278)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2345)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadModel(AbstractMergedModelProvider.java:249)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getMergedModel(AbstractMergedModelProvider.java:219)
    at org.eclipse.jst.jee.model.internal.Web25MergedModelProvider.modify(Web25MergedModelProvider.java:80)
    at org.eclipse.jst.j2ee.web.project.facet.WebFacetInstallDelegate.populateDefaultContent(WebFacetInstallDelegate.java:311)
    at org.eclipse.jst.j2ee.web.project.facet.WebFacetInstallDelegate.createWeb30DeploymentDescriptor(WebFacetInstallDelegate.java:257)
    at org.eclipse.jst.j2ee.web.project.facet.WebFacetInstallDelegate.execute(WebFacetInstallDelegate.java:122)
    at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.callDelegate(FacetedProject.java:1477)
    at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modifyInternal(FacetedProject.java:441)
    at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChangesInternal(FacetedProject.java:1181)
    at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.access$2(FacetedProject.java:1117)
    at org.eclipse.wst.common.project.facet.core.internal.FacetedProject$5.run(FacetedProject.java:1099)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2345)
    at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChanges(FacetedProject.java:1109)
    at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.commitChanges(FacetedProjectWorkingCopy.java:2020)
    at org.eclipse.wst.common.project.facet.ui.internal.FacetsPropertyPage$4.run(FacetsPropertyPage.java:232)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2345)
    at org.eclipse.wst.common.project.facet.ui.internal.FacetsPropertyPage$5.run(FacetsPropertyPage.java:246)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

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这是哪一个开普勒软件包？它是如何安装的？它是动态的还是静态的“web模块”方面？eclipse-jee-kepler-SR1-win32-x86_64是eclipse版本。它的zip文件和动态模块。