Receiving ' not a servlet class ' error while deploying a maven war to websphere portal
我已经将portlet项目转换为maven并创建了其war文件。当我部署war文件时，它在websphere门户控制台中不会生成任何错误，但是在SystemOut.log文件中会生成以下错误日志-----
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | [8/29/17 18:01:45:380 IST] 00006095 jsp W com.ibm.ws.jsp.taglib.TldParser endElement JSPG0235E: The JSP container failed to loa d the TagExtraInfo class [org.apache.taglibs.standard.tei.XmlTransformTEI] from META-INF/x-1_0-rt.tld [8/29/17 18:01:45:381 IST] 00006095 jsp W com.ibm.ws.jsp.taglib.TldParser endElement JSPG0235E: The JSP container failed to loa d the TagExtraInfo class [org.apache.taglibs.standard.tei.XmlParseTEI] from META-INF/x-1_0.tld [8/29/17 18:01:45:381 IST] 00006095 jsp W com.ibm.ws.jsp.taglib.TldParser endElement JSPG0235E: The JSP container failed to loa d the TagExtraInfo class [org.apache.taglibs.standard.tei.XmlTransformTEI] from META-INF/x-1_0.tld [8/29/17 18:01:45:381 IST] 00006095 jsp W com.ibm.ws.jsp.taglib.TldParser endElement JSPG0235E: The JSP container failed to loa d the TagExtraInfo class [org.apache.taglibs.standard.tei.XmlParseTEI] from META-INF/x.tld [8/29/17 18:01:45:382 IST] 00006095 jsp W com.ibm.ws.jsp.taglib.TldParser endElement JSPG0235E: The JSP container failed to loa d the TagExtraInfo class [org.apache.taglibs.standard.tei.XmlTransformTEI] from META-INF/x.tld [8/29/17 18:01:45:418 IST] 00006095 webapp E com.ibm.ws.webcontainer.webapp.WebApp commonInitializationFinally CWSRV0266E: Error o ccured while initializing servlets: {0} javax.servlet.UnavailableException: CWSRV0201E: Servlet [com.bluestar.servlet.InitializationServlet]: no t a servlet class at com.ibm.ws.webcontainer.servlet.ServletWrapper$1.run(ServletWrapper.java:1501) at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118) at com.ibm.ws.webcontainer.servlet.ServletWrapper.loadServlet(ServletWrapper.java:1475) at com.ibm.ws.webcontainer.servlet.ServletWrapper.loadOnStartupCheck(ServletWrapper.java:1354) at com.ibm.ws.webcontainer.webapp.WebApp.doLoadOnStartupActions(WebApp.java:614) at com.ibm.ws.webcontainer.webapp.WebApp.commonInitializationFinally(WebApp.java:584) at com.ibm.ws.webcontainer.webapp.WebAppImpl.initialize(WebAppImpl.java:425) at com.ibm.ws.webcontainer.webapp.WebGroupImpl.addWebApplication(WebGroupImpl.java:88) at com.ibm.ws.webcontainer.VirtualHostImpl.addWebApplication(VirtualHostImpl.java:169) at com.ibm.ws.webcontainer.WSWebContainer.addWebApp(WSWebContainer.java:746) at com.ibm.ws.webcontainer.WSWebContainer.addWebApplication(WSWebContainer.java:634) at com.ibm.ws.webcontainer.component.WebContainerImpl.install(WebContainerImpl.java:426) at com.ibm.ws.webcontainer.component.WebContainerImpl.start(WebContainerImpl.java:718) at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:1177) at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:1370) at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:639) at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:968) at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:776) at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplicationDynamically(ApplicationMgrImpl.java:1379) at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2189) at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:446) at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:123) at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:389) at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$500(CompositionUnitMgrImpl.java:117) at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$1.run(CompositionUnitMgrImpl.java:664) at com.ibm.ws.security.auth.ContextManagerImpl.runAs(ContextManagerImpl.java:5474) at com.ibm.ws.security.auth.ContextManagerImpl.runAsSystem(ContextManagerImpl.java:5600) at com.ibm.ws.security.core.SecurityContext.runAsSystem(SecurityContext.java:255) at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.startCompositionUnit(CompositionUnitMgrImpl.java:678) at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.startCompositionUnit(CompositionUnitMgrImpl.java:622) at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:1269) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:88) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) at java.lang.reflect.Method.invoke(Method.java:618) at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:87) at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) at java.lang.reflect.Method.invoke(Method.java:618) at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:291) at javax.management.modelmbean.RequiredModelMBean$4.run(RequiredModelMBean.java:1260) at java.security.AccessController.doPrivileged(AccessController.java:300) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) at javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1254) at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:1092) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:831) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:813) at com.ibm.ws.management.AdminServiceImpl$1.run(AdminServiceImpl.java:1335) at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118) at com.ibm.ws.management.AdminServiceImpl.invoke(AdminServiceImpl.java:1228) at com.ibm.ws.management.application.AppManagementImpl._startApplication(AppManagementImpl.java:1482) at com.ibm.ws.management.application.AppManagementImpl.startApplication(AppManagementImpl.java:1371) at com.ibm.ws.management.application.AppManagementImpl.startApplication(AppManagementImpl.java:1320) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:88) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) at java.lang.reflect.Method.invoke(Method.java:618) at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:87) at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) at java.lang.reflect.Method.invoke(Method.java:618) at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:291) at javax.management.modelmbean.RequiredModelMBean$4.run(RequiredModelMBean.java:1260) at java.security.AccessController.doPrivileged(AccessController.java:300) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) at javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1254) at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:1092) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:831) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:813) at com.ibm.ws.management.AdminServiceImpl$1.run(AdminServiceImpl.java:1335) at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118) at com.ibm.ws.management.AdminServiceImpl.invoke(AdminServiceImpl.java:1228) at com.ibm.ws.management.connector.AdminServiceDelegator.invoke(AdminServiceDelegator.java:181) at sun.reflect.GeneratedMethodAccessor327.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55) at java.lang.reflect.Method.invoke(Method.java:618) at com.ibm.ws.management.connector.soap.SOAPConnector.invoke(SOAPConnector.java:488) at com.ibm.ws.management.connector.soap.SOAPConnector.service(SOAPConnector.java:322) at com.ibm.ws.management.connector.soap.SOAPConnection.handleRequest(SOAPConnection.java:65) at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:733) at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:522) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1864) [8/29/17 18:01:45:419 IST] 00006095 webcontainer I com.ibm.ws.webcontainer.VirtualHostImpl addWebApplication CWSRV0250I: Web Module CMSMaterialRequestPortlet has been bound to default_host[*:10012,*:80,*:10014,*:10028,*:10029,*:443,*:10039,*:10042,*:10041]. [8/29/17 18:01:45:448 IST] 00006095 ApplicationMg A CWWSR0221I: Application started: PA_CMSMaterialRequest [8/29/17 18:01:45:448 IST] 00006095 CompositionUn A CWWSR0191I: Composition unit WebSphere:cuname=PA_CMSMaterialRequest in BLA WebSphere:blaname=PA_CMSMaterialRequest started. [8/29/17 18:03:00:842 IST] 000000f4 ServletWrappe E com.ibm.ws.webcontainer.servlet.ServletWrapper init Uncaught.init.exception.thrown.by.servlet [8/29/17 18:03:00:848 IST] 000000f4 ServletWrappe E com.ibm.ws.webcontainer.servlet.ServletWrapper init Uncaught.init.exception.thrown.by.servlet |
当我将此portlet分配给Websphere Portal中的页面时
"不是Servlet类"消息几乎总是表明存在package问题，在该问题中，应用程序在PARENT_LAST类加载器中包括了自己的Servlet API副本。启动Web应用程序时，服务器的Web容器将从应用程序中加载Servlet类。 Web容器链接到服务器的Java EE API中打包的Servlet版本，而应用程序类则链接到与其一起打包的Servlet版本。 JVM认为由单独的类装入器装入的类是不兼容的(无论它们的实际字节码如何)，因此导致的强制转换失败。
解决方案是将Web模块的类加载器切换为PARENT_FIRST，或者从应用程序中删除Servlet API(实际上是任何Java EE API，除非您明确使用自己的版本)。两种解决方案都应消除此问题。