om.google.appengine.tools.admin.AdminException: Unable to update app: Failed to

om.google.appengine.tools.admin.AdminException: Unable to update app: Failed to compile jsp files.
at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:333)
at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:52)
at com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy(AppEngineBridgeImpl.java:400)
at com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace(DeployProjectJob.java:148)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: com.google.appengine.tools.admin.JspCompilationException: Failed to compile jsp files.
at com.google.appengine.tools.admin.Application.compileJsps(Application.java:583)
at com.google.appengine.tools.admin.Application.createStagingDirectory(Application.java:434)
at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:327)
... 5 more

解决方法：The problem was that my jakarta-standard-1.1.2.jar is corrupted, when
> > i replaced it with another one, the problem was solved.