problem with starting Struts2

[Jimmy Wales]

Hello fellow ranchers,

Please help me get started with Struts 2. I have no previous experience of struts 1...so my question might seem a bit naiive

I've written a hello world program in struts 2. When I run the application, the index file is displayed, which indicates that my web.xml is rightly configured. But when i do an action(submitting my name and redisplaying it with another jsp page), I get this error

 javax.servlet.ServletException: Unable to intantiate Action! - action - file:/home/aluru/NetBeansProjects/StrutsTraining/build/web/WEB-INF/classes/struts.xml:8:80[code]    

So, I began digging my struts.xml file. Here are the contents of the file

  <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
  "-//Apache Software Foundation//DTD Struts Configuration
2.0//EN"
  "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
  <package name="karthik" extends="struts-default">
     <action name="helloWorld" class="fr.irit.karthik.struts.HelloWorldAction">
       <result name="success">/HelloWorldSuccess.jsp</result>
     </action>
  </package>
</struts>
  

So, basically server points that there is an error at the action tag in the configuration file. Can anyone point me what's causing the problem? Could it be anything from the java file?

  /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package fr.irit.karthik.struts;

import com.opensymphony.xwork2.ActionSupport;

/**
 *
 * @author aluru
 */
public class HelloWorldAction extends ActionSupport {
    private String myName;

    @Override
    public String execute(){
        return "success";
    }
    public void setMyName(String name){
        myName = name;
    }
    public String getMyName(){
        return myName;
    }

}  

Many thanks in advance for your replies. I'm kinda deadlocked with this problem!

[David Newton]

Turn devMode on, put logging at DEBUG level, and check the logs.

[Jimmy Wales]

Hi David,

Thanks for your reply. As I mentioned I'm new to struts, so kindly bear with my naivety(if it seems so)

I was able to turn devMode on struts.xml file, but how can i put logging to debug and initialize logging? I tried googling, but I couldn't get any good answer for struts2. I'm surprised, considering that struts2 has a huge developer base and expected good documentation/articles/tutorials.

Anyway, could you let me know how do I proceed with logging or any link which could explain the same?

Thanks a bunch.

[David Newton]

It uses commons-logging; just configure whatever underlying logging system you're using and CL will pick it up.

[Jimmy Wales]

Hi David,

I haven't been able to get my hands on logging, but I checked out the server log. I got these warnings/errors while deploying the app. Could you let me know if this indicates any problem? I'm using glass fish v3 server.

  
WARNING: Unable to load config class com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor at Class: java.lang.Class
File: Class.java
Method: newInstance0
Line: 340 - java/lang/Class.java:340:-1 probably due to a missing jar, which might be fine if you never plan to use the workflow interceptor
SEVERE: Actual exception
Unable to instantiate an instance of Interceptor class [com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor]. - Class: java.lang.Class
File: Class.java
Method: newInstance0
Line: 340 - java/lang/Class.java:340:-1
        at org.apache.struts2.plexus.PlexusObjectFactory.buildInterceptor(PlexusObjectFactory.java:173)
        at com.opensymphony.xwork2.config.providers.InterceptorBuilder.constructInterceptorReference(InterceptorBuilder.java:57)
        at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.lookupInterceptorReference(XmlConfigurationProvider.java:905)
        at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptorStack(XmlConfigurationProvider.java:743)
        at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptorStacks(XmlConfigurationProvider.java:756)
        at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptors(XmlConfigurationProvider.java:777)
        at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:410)
        at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:239)
        at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
        at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:152)
        at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
        at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
        at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
        at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
        at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:259)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
        at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
        at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
        at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
        at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
        at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
        at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
        at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
        at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
        at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.InstantiationException: com.opensymphony.xwork2.interceptor.Interceptor
        at java.lang.Class.newInstance0(Class.java:340)
        at java.lang.Class.newInstance(Class.java:308)
        at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:123)
        at org.apache.struts2.plexus.PlexusObjectFactory.lookup(PlexusObjectFactory.java:298)
        at org.apache.struts2.plexus.PlexusObjectFactory.buildBean(PlexusObjectFactory.java:216)
        at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:154)
        at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:143)
        at org.apache.struts2.plexus.PlexusObjectFactory.buildInterceptor(PlexusObjectFactory.java:146)
        ... 39 more
  

I have around 20 of these kind of errors, for various classes, like for Execute and Wait Interceptor, AnnotationValidationInterceptor, StrutsConversionErrorInterceptor etc.

Am I missing something? I added all of the struts 2.0.14 jar files to the libraries of my current project.


And then I get this log, when I try to perform an action.

  WARNING: StandardWrapperValve[default]: PWC1406: Servlet.service() for servlet default threw exception
Unable to intantiate Action! - action - file:/home/aluru/NetBeansProjects/StrutsTraining/build/web/WEB-INF/classes/struts.xml:9:80
        at com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:277)
        at com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:365)
        at com.opensymphony.xwork2.DefaultActionInvocation.access$000(DefaultActionInvocation.java:38)
        at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:83)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.<init>(DefaultActionInvocation.java:74)
        at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:189)
        at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:41)
        at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:494)
        at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:422)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
        at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
        at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
        at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
        at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
        at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
        at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
        at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
        at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
        at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.InstantiationException: com.opensymphony.xwork2.Action
        at java.lang.Class.newInstance0(Class.java:340)
        at java.lang.Class.newInstance(Class.java:308)
        at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:123)
        at org.apache.struts2.plexus.PlexusObjectFactory.lookup(PlexusObjectFactory.java:298)
        at org.apache.struts2.plexus.PlexusObjectFactory.buildBean(PlexusObjectFactory.java:216)
        at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:154)
        at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:143)
        at com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:113)
        at org.apache.struts2.plexus.PlexusObjectFactory.buildAction(PlexusObjectFactory.java:127)
        at com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:275)
        ... 34 more  

Does this help to trace the problem?

PS: There is some problem with netbeans 6.8 + tomcat 6.0. I can't get the application running. So, I'm using glassfish. With this atleast I can see the index page

Thanks in advance.

[David Newton]

What libraries (specifically) are you deploying, and are you deploying them correctly (to WEB-INF/lib)?

[sarada srinivas]

If you are new to struts2 you can run struts2-blank-2.0.14.war provided in struts-2.0.14\apps

-Sarada