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java 异常处理java.lang.LinkageError

时间:2013-03-23 13:36 来源: IT技术网作者:json

这个是我在做Demo的时候,struts2整合到web工程中报的异常.并且由此引起了一个空指针.

java 异常处理java.lang.LinkageError

严重: Servlet.service() for servlet jsp threw exception

java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature

at org.apache.jsp.index_jsp._jspInit(index_jsp.java:22)

at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)

at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)

at java.lang.Thread.run(Thread.java:662)

2013-3-12 13:10:04 org.apache.catalina.core.StandardWrapperValve invoke

严重: Servlet.service() for servlet jsp threw exception

java.lang.NullPointerException