Warum bekomme ich NullPointerException in liveray?

Question

Ich bin ein NullPointerException in der folgenden Zeile bekommen:

originalStrutsPortletAction.processAction(
        originalStrutsPortletAction, portletConfig, actionRequest, 
         actionResponse); 

Ich drucke alle Werte:

System.out.println(originalStrutsPortletAction); 
System.out.println(portletConfig); 
System.out.println(actionRequest); 
System.out.println(actionResponse); 

Ausgang:

com.liferay.portal.struts.StrutsPortletActionAdapter@2f20c4be 
com.liferay.portlet.PortletConfigImpl@5f4268dd 
com.liferay.portlet.ActionRequestImpl@1054ae1e 
com.liferay.portlet.ActionResponseImpl@27733bf2 

Warum ich NullPointerException immer bin ? Bitte helfen. Vielen Dank im Voraus. Der vollständige Stack-Trace ist wie folgt: -

java.lang.NullPointerException 
    at com.liferay.portlet.login.action.LoginAction.login(LoginAction.java:196) 
    at com.liferay.portlet.login.action.LoginAction.processAction(LoginAction.java:93) 
    at com.liferay.portal.struts.StrutsPortletActionAdapter.processAction(StrutsPortletActionAdapter.java:60) 
    at com.liferay.portal.kernel.struts.BaseStrutsPortletAction.processAction(BaseStrutsPortletAction.java:44) 
    at com.abhishek.ExampleLoginAction.check(ExampleLoginAction.java:185) 
    at org.apache.jsp.jsp.otpCheck_jsp._jspService(otpCheck_jsp.java:71) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) 
    at sun.reflect.GeneratedMethodAccessor503.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:67) 
    at com.sun.proxy.$Proxy660.doFilter(Unknown Source) 
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116) 
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:165) 
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:96) 
    at com.liferay.portal.kernel.servlet.PortalClassLoaderFilter.doFilter(PortalClassLoaderFilter.java:74) 
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:204) 
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:109) 
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:96) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

Answer 1

Einfache Antwort: Sie erhalten nicht eine Nullpointer an dieser orts- zumindest nicht nach der stacktrace Sie Beiträge verfassen. Liferays LoginAction hat keine originalStrutsAction. Falls Sie 6.2 GA5 verwenden, this is the code, die die NullpointerException auslöst. Warum? Das hast du nicht gefragt.

Oder, um es anders auszudrücken: Sie erhalten eine NullpointerException, weil Sie einen Nullpointer dereferenzieren. Sie müssen nur identifizieren, wo Sie es tatsächlich bekommen. Der Stacktrace hilft. Wer weiß, was Ihre ExampleLoginAction macht, bevor sie die von Ihnen gepostete Zeile aufruft ...