targetisnullformethodgetBean

An exception has occurred. 
You may continue by restarting the session. 

org.apache.tapestry.ApplicationRuntimeException 
Unable to initialize property studentManagerService of com.page.Register$Enhance_0@12801c5[Register]: Unable to read expression '' of com.page.Register$Enhance_0@12801c5[Register]. 
location: context:/WEB-INF/register/Register.page, line 14, column 44 
   
org.apache.tapestry.ApplicationRuntimeException 
Unable to read expression '' of com.page.Register$Enhance_0@12801c5[Register]. 
   
java.lang.NullPointerException 
target is null for method getBean 
Stack Trace: 
ognl.OgnlRuntime.callMethod(OgnlRuntime.java:821) 
ognl.ASTMethod.getValueBody(ASTMethod.java:75) 
ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170) 
ognl.SimpleNode.getValue(SimpleNode.java:210) 
ognl.ASTChain.getValueBody(ASTChain.java:109) 
ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170) 
ognl.SimpleNode.getValue(SimpleNode.java:210) 
ognl.Ognl.getValue(Ognl.java:333) 
ognl.Ognl.getValue(Ognl.java:310) 
org.apache.tapestry.util.prop.OgnlUtils.get(OgnlUtils.java:133) 
org.apache.tapestry.util.prop.OgnlUtils.get(OgnlUtils.java:158) 
org.apache.tapestry.pageload.PropertyInitializer.pageDetached(PropertyInitializer.java:109) 
org.apache.tapestry.pageload.PageLoader.establishDefaultPropertyValues(PageLoader.java:823) 
org.apache.tapestry.pageload.PageLoader.loadPage(PageLoader.java:774) 
org.apache.tapestry.pageload.PageSource.getPage(PageSource.java:152) 
org.apache.tapestry.engine.RequestCycle.getPage(RequestCycle.java:195) 
org.apache.tapestry.engine.DirectService.service(DirectService.java:127) 
org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:889) 
org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:198) 
org.apache.tapestry.ApplicationServlet.doPost(ApplicationServlet.java:327) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:709) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214) 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118) 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) 
java.lang.Thread.run(Unknown Source) 
 

请大家帮助！  谢谢 

1 个解决方案

#1

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