Hi,
I'm getting an NPE when trying to use DWR validation in Struts 2.1.6.
Basically, porting a Struts 2.0.x app that used DWR validation.
The ValueStackFactory is null during the invocation and this throws the NPE
while calling valueStackFactory.createValueStack();
In normal invocation, all is fine.
How is the valueStackFactory set ? . Do i need to add any config so that the
DWR flow initializes valueStackFactory properly?
Below is the stacktrace and web.xml config:
[4/24/09 17:25:15:942 IST] 0000002b DWRValidator E
com.opensymphony.xwork2.util.logging.commons.CommonsLogger error Error while
trying to validate
java.lang.NullPointerException
at
com.opensymphony.xwork2.DefaultActionInvocation.createContextMap(DefaultActionInvocation.java:331)
at
com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:377)
at
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:186)
at
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)
at
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
at
org.apache.struts2.validators.DWRValidator.doPost(DWRValidator.java:106)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:618)
at uk.ltd.getahead.dwr.impl.ExecuteQuery.execute(ExecuteQuery.java:233)
at
uk.ltd.getahead.dwr.impl.DefaultExecProcessor.handle(DefaultExecProcessor.java:48)
at
uk.ltd.getahead.dwr.impl.DefaultProcessor.handle(DefaultProcessor.java:83)
at
uk.ltd.getahead.dwr.AbstractDWRServlet.doPost(AbstractDWRServlet.java:162)
---------web.xml---------------
<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>
<servlet>
<servlet-name>dwr</servlet-name>
<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
---------end web.xml---------------
Any help is very much appreciated,
s2user
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