问题3:WebLogic下Argument(s) "type" can't be null.

启动项目出现Argument(s) "type" can't be null.异常。异常如下：

java.lang.IllegalArgumentException: Argument(s) "type" can't be null.
at com.sun.xml.bind.api.TypeReference.<init>(TypeReference.java:93)
at com.sun.xml.ws.model.RuntimeModeler.processDocWrappedMethod(RuntimeModeler.java:758)
at com.sun.xml.ws.model.RuntimeModeler.processMethod(RuntimeModeler.java:678)
at com.sun.xml.ws.model.RuntimeModeler.processClass(RuntimeModeler.java:428)
at com.sun.xml.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:277)
Truncated. see log file for complete stacktrace
> 
<11.02.2014 22:28 Uhr FET> <Error> <Deployer> <BEA-149265> <Failure occurred in the execution of deployment request with ID '1392146884362' for task '17'. Error is: 'weblogic.application.ModuleException: [HTTP:101216]Servlet: "ItvasDAS" failed to preload on startup in Web application: "itvas-das-0.0.1.war".
java.lang.IllegalArgumentException: Argument(s) "type" can't be null.
at com.sun.xml.bind.api.TypeReference.<init>(TypeReference.java:93)
at com.sun.xml.ws.model.RuntimeModeler.processDocWrappedMethod(RuntimeModeler.java:758)
at com.sun.xml.ws.model.RuntimeModeler.processMethod(RuntimeModeler.java:678)
at com.sun.xml.ws.model.RuntimeModeler.processClass(RuntimeModeler.java:428)
at com.sun.xml.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:277)
at com.sun.xml.ws.server.EndpointFactory.createSEIModel(EndpointFactory.java:363)
at com.sun.xml.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:202)
at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:496)
at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:539)
at weblogic.wsee.jaxws.JAXWSDeployedServlet.getEndpoint(JAXWSDeployedServlet.java:183)
at weblogic.wsee.jaxws.JAXWSServlet.registerEndpoint(JAXWSServlet.java:139)
at weblogic.wsee.jaxws.JAXWSServlet.init(JAXWSServlet.java:68)
at weblogic.wsee.jaxws.JAXWSDeployedServlet.init(JAXWSDeployedServlet.java:54)
at javax.servlet.GenericServlet.init(GenericServlet.java:241)
at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:283)
...
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:68)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:545)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)

搜了好久，最后在一篇来外的文章上（http://www.intropro.com/resources/blog/66-argument-s-type-can-t-be-null）找到解决方法：删除WEB-INF/lib下jaxb-api-2.2.3-2.5.2.jar、jaxb-impl-2.2.4-1-2.5.2.jar、jaxb-xjc-2.2.4-1-2.5.2.jar 三个jar包。问题解决。

最后整个项目终于成功启动运行。

总结：Tomcat下项目运行正常，发布到WebLogic下出现异常，多半是jar包不兼容问题。找到报错的类，查找jar，删除冲突即可。