HELP with java.lang.NullPointerException on doFilter

[gaston e lopez]

HI, I need some helo with this. I cant resolve.

I have the next error: javax.servlet.ServletException: java.lang.NullPointerException inside a method doFilter.
I dont know what else to do... I cant find the error.

org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:508)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:415)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:225)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1858)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:446)
javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:333)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
negocio.DAO.Hibernation.doFilter(Hibernation.java:126)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:313)
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291)
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:666)
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:597)
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:872)
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(PortUnificationPipeline.java:382)
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:264)
com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)

[Vicky Vijay]

Which version of struts you are using.. ??

Please provide more details on it..

If possible provide your configuration file and source code..

[gaston e lopez]

Yes!.

Struts version: 1.1
I use this controller:

<controller processorClass="org.apache.struts.tiles.TilesRequestProcessor"/>

and this plugins:

<plug-in className="org.apache.struts.tiles.TilesPlugin">
        <set-property property="definitions-config" value="/WEB-INF/tiles-defs.xml"/>
        <set-property property="moduleAware" value="true"/>
        <set-property property="definitions-parser-validate" value="false"/>
</plug-in>
    
<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
        <set-property property="pathnames" value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
        <set-property property="stopOnFirstError" value="true"/>
</plug-in>

I have a class Hibernation.java with a method doFilter where the error is produced:

This is the method:

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        if (((hibernateHolder.get()) != null) || (hibernateHolderSQLServer.get() != null)) {
            logger.error("A session is already associated with this thread!  " + "Someone must have called getSession() outside of the context " + "of a servlet request");
            throw new IllegalStateException("A session is already associated with this thread!  " + "Someone must have called getSession() outside of the context " + "of a servlet request.");
        }

        try {
            chain.doFilter(request, response); // [b]this is the line  negocio.DAO.Hibernation.doFilter(Hibernation.java:126) [/b] 
        } catch (Exception e) {
            logger.error( stacktrace(e) );
        } finally {
            Session sess = (Session) hibernateHolder.get();
            Session sessO = (Session) hibernateHolderSQLServer.get();

            Transaction tx = (Transaction) txHolder.get();
            Transaction txO = (Transaction) txHolderSQLServer.get();

            if (sess != null) {
                hibernateHolder.set(null);
                try {
                    if (sess.isOpen()) 
                        sess.close();
                } catch (HibernateException ex) {
                    Error error = ServiceMessageErrorDriver.obtenerMensajeError(ex, "Hibernation - Error en doFilter (ref 2)", 5L);
                    logger.error("<xml>"+ error.getErrorXML() + "</xml>");
                    throw new ServletException(ex);
                }
            }

            if (sessO != null) {
                hibernateHolderSQLServer.set(null);
                try {
                    if (sessO.isOpen()) 
                        sessO.close();
                } catch (HibernateException ex) {
                    logger.error(ex);
                    throw new ServletException(ex);
                }
            }

        }
    }