EJB部署失败Error: Exception preparing module
weblogic启动时出现以下错误：
是什么原因？？

{
Module Name: PayEJB, Error: Exception preparing module: EJBModule(PayEJB,status=NEW)


Unable to deploy EJB: PayEJB.jar from PayEJB.jar:


Compiler failed executable.exec

at weblogic.ejb20.ejbc.EJBCompiler.doCompile(EJBCompiler.java:274)
at weblogic.ejb20.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:476)
at weblogic.ejb20.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:407)
at weblogic.ejb20.deployer.EJBDeployer.runEJBC(EJBDeployer.java:493)
at weblogic.ejb20.deployer.EJBDeployer.compileJar(EJBDeployer.java:762)
at weblogic.ejb20.deployer.EJBDeployer.compileIfNecessary(EJBDeployer.java:700)
at weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1317)
at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:498)
at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:3101)
at weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.java:1560)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1208)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1051)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:823)
at weblogic.management.deploy.slave.SlaveDeployer$Application.prepare(SlaveDeployer.java:2925)
at weblogic.management.deploy.slave.SlaveDeployer.prepareAllApplications(SlaveDeployer.java:967)
at weblogic.management.deploy.slave.SlaveDeployer.resume(SlaveDeployer.java:349)
at weblogic.management.deploy.DeploymentManagerServerLifeCycleImpl.resume(DeploymentManagerServerLifeCycleImpl.java:229)
at weblogic.t3.srvr.SubsystemManager.resume(SubsystemManager.java:131)
at weblogic.t3.srvr.T3Srvr.resume(T3Srvr.java:966)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:361)
at weblogic.Server.main(Server.java:32)

java.io.IOException: Compiler failed executable.exec
at weblogic.utils.compiler.CompilerInvoker.compileMaybeExit(CompilerInvoker.java:469)
at weblogic.utils.compiler.CompilerInvoker.compile(CompilerInvoker.java:328)
at weblogic.utils.compiler.CompilerInvoker.compile(CompilerInvoker.java:336)
at weblogic.ejb20.ejbc.EJBCompiler.doCompile(EJBCompiler.java:270)
at weblogic.ejb20.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:476)
at weblogic.ejb20.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:407)
at weblogic.ejb20.deployer.EJBDeployer.runEJBC(EJBDeployer.java:493)
at weblogic.ejb20.deployer.EJBDeployer.compileJar(EJBDeployer.java:762)
at weblogic.ejb20.deployer.EJBDeployer.compileIfNecessary(EJBDeployer.java:700)
at weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1317)
at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:498)
at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:3101)
at weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.java:1560)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1208)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1051)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:823)
at weblogic.management.deploy.slave.SlaveDeployer$Application.prepare(SlaveDeployer.java:2925)
at weblogic.management.deploy.slave.SlaveDeployer.prepareAllApplications(SlaveDeployer.java:967)
at weblogic.management.deploy.slave.SlaveDeployer.resume(SlaveDeployer.java:349)
at weblogic.management.deploy.DeploymentManagerServerLifeCycleImpl.resume(DeploymentManagerServerLifeCycleImpl.java:229)
at weblogic.t3.srvr.SubsystemManager.resume(SubsystemMan