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Struts application throws error

Greenhorn

Posts: 14

posted 10 years ago

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Hi,
I have a web dynamic Struts project which throws error on running.

Project tree:

Code snippets:
1. LoginAction

2. struts.xml:

3. web.xml

error.jsp

success.jsp:

Index.jsp

JAR files are in lib folder and configured.

However when i run the project, it gives me following error:

Struts Problem Report
Struts has detected an unhandled exception:

Messages:
File: org/apache/struts2/impl/StrutsActionProxy.java
Line number: 69

--------------------------------------------------------------------------------

Stacktraces
java.lang.NullPointerException
org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:37)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:552)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
java.lang.Thread.run(Thread.java:619)

Any help will be appreciated.

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Joe Ess

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posted 10 years ago

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I see a couple of things wrong:
In web.xml, FilterDispatcher is deprecated. Use StrutsPrepareAndExecuteFilter.
In struts.xml, you include struts-default.xml. This is unnecessary. Your package declaration also does not declare a namespace.

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Khushi Sing

Greenhorn

Posts: 14

posted 10 years ago

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Hi Joe Ess ,

Thankyou for taking time to reply.
- I modified filter class to "<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>" as you asked.
- Removed 'include file="struts-default.xml'.
- Provided name space for package '<package name="com" extends="struts-default" namespace="/">'.

Modified struts.xml:

Modified web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Struts2HelloWorldExample</display-name>
    <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>    
  </welcome-file-list>
</web-app>

I still get this error:

Struts Problem Report
Struts has detected an unhandled exception:

Messages: There is no Action mapped for namespace [/] and action name [] associated with context path [/Struts2LoginFormExample].

--------------------------------------------------------------------------------

Stacktraces
There is no Action mapped for namespace [/] and action name [] associated with context path [/Struts2LoginFormExample]. - [unknown location] 
    com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
    org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
    org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:37)
    com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:552)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
    java.lang.Thread.run(Thread.java:619)

--------------------------------------------------------------------------------

You are seeing this page because development mode is enabled. Development mode, or devMode, enables extra debugging behaviors and reports to assist developers. To disable this mode, set:

struts.devMode=false

in your WEB-INF/classes/struts.properties file.

Web container is Tomcat 7. Non-struts type web applications are running fine, problem with struts project only.
Is there anything else i need to do to run this project?
Regards

Joe Ess

Bartender

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posted 10 years ago

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It looks like you are entering a URL that does not correspond to an action:

This is odd because you have a default.jsp in your project and declared as a welcome file in web.xml. Try removing the welcome files that don't exist.
I know at some point it was not possible to use a JSP (actually a servlet) as a welcome file and at some point the servlet specification permitted this, but I don't know off the top of my head which version of the specification and Tomcat allow it. Perhaps change your welcome file to a plain HTML page. Also look at your Tomcat logs to see if there is another problem preventing the application from deploying properly. Tomcat also has a built-in manager that can tell you if the application is available.

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Khushi Sing

Greenhorn

Posts: 14

posted 10 years ago

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I really what went wrong. Just to test,made 2 mini dynamic web page project to construct a struts app. 1 works and another does not, though methodology is same.
Working struts project configuration( helloworld application from tutorials point):
web.xml (webcontent>web-inf>web.xml)
/******web.xml code begins*********************************************************/

/********************web.xml ends*********************************/
index.jsp, welcome file configured in web.xml. File location: WebContent>index.jsp
/******************index.jsp begins*****************************/

/*******************index.jsp ends**************************************/
struts.xml. File Location: WebContent>web-inf>classes>struts.xml
/*************************struts.xml begins***********************************/

/***********************************struts.xml ends****************/
Action class, HelloWorldAction. File location: JavaResources> src>com.tutorialspoint.struts2
/*****************HelloWorldAction.java begins****************/

/***************HelloWorldAction ends****************/
HelloWorld.jsp, file location: WebContent>HelloWorld.jsp
/*****************HelloWorld begins******************/

/**************Hello World ends*********************************/
Built path for struts2 jar files in WebContent>WebINF>lib folder.
Deployed the project in web-apps folder of apache tomacat.
On running this project it runs perfectly. But when i run another mini project in same way, same configurations it does not work. i have checked for possible mistakes but they dont work...
Heres the code:
web.xml (webcontent>web-inf>web.xml)
/******web.xml*********************************************************/

/**************web.xml ends********************************/
index.jsp, welcome file configured in web.xml. File location: WebContent>index.jsp
/******************index.jsp begins*****************************/

/*********************index.jsp ends******************************/
struts.xml. File Location: WebContent>web-inf>classes>struts.xml
/*************************struts.xml begins***********************************/

/*****************struts.xml ends********************/
Action class, "ActionClass.java". File location: JavaResources> src>com.unit>ActionClass.java
/*****************ActionClass.java begins****************/

/****************ActionClass ends*****************/
Success.jsp. File location: WebContent>WEB-INF>Success.jsp
/*****************Success.jsp begins******************/

/***************Success.jsp ends*****************/

I have used same jar files in lib folder Same way of deployment. Yet it gives an error:

Why is Hello-World working and the next project isn't when done in same way..? I don't see anything wrong with Action class. I am using eclipse indigo and am not keen on using paid versions of eclipse, so available capabilities is not a very good idea. If any one can help it would be great. Thank-you.

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