Struts2 + JSON : Getting Class Not Found Error

[Girish Kumar Prabhakar]

Hi All,

I am integrating Struts2 and JSON. For this, i am using Struts2 inbuilt support for JSON. But i am getting the following error.
java.lang.NoClassDefFoundError: org/apache/commons/lang/xwork/StringUtils

I have searched on net, but could find this jar, instead commons-lang.jar have org/apache/commons/lang/StringUtils class and no xwork package.

Here is my struts.xml and jsp code.

struts.xml
<package name="default" namespace="/" extends="struts-default">
<result-types>
<result-type name="json" class="org.apache.struts2.json.JSONResult" />
</result-types>

<action name="jsonAction" class="com.AutoComplete">
<result name="SUCCESS" type="json"><param name="root">myList</param></result>
</action>
</package>

jsp code
<s:url id="myList" value="jsonAction"/>
<sx:autocompleter label="Enter" href="%{myList}" name="city" autoComplete="true"></sx:autocompleter>

I am using spring2-core-2.1.6.jar and xwork-2.1.2.jar.

Thanks in advance.
Girish

[David Newton]

spring2-core-2.1.6.jar?

That aside: is there more to the stack trace than that?

[Girish Kumar Prabhakar]

Hi David,

Thanks for your reply.
This is the full stacktrace which i am getting.

java.lang.NoClassDefFoundError: org/apache/commons/lang/xwork/StringUtils
	at org.apache.struts2.json.SerializationParams.<init>(SerializationParams.java:57)
	at org.apache.struts2.json.JSONResult.writeToResponse(JSONResult.java:214)
	at org.apache.struts2.json.JSONResult.execute(JSONResult.java:204)
	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:361)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:265)
	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249)
	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:148)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:93)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:128)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:148)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:128)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:468)
	at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)

Or, is there any better way to implement json?

Thanks

[David Newton]

Please list the actual jars you're deploying.

[Girish Kumar Prabhakar]

Hi David,

These are the jars i am using :

struts2-core-2.1.6.jar
xstream-1.2.2.jar
xwork-2.1.2.jar
freemarker-2.3.8.jar
ognl-2.6.9.jar
dom4j-1.6.1.jar
commons-collections-3.1.jar
commons-dbcp-1.2.2.jar
commons-logging-1.0.4.jar
struts2-spring-plugin-2.0.11.2.jar
tiles-api-2.1.2.jar
tiles-core-2.1.2.jar
tiles-jsp-2.1.2.jar
struts2-tiles-plugin-2.0.12.jar
spring.jar


Is there any other information you require.

Thanks.

[David Newton]

Where is the JSON plugin jar?

And *please* only use plugins from the same version of Struts you're using? It isn't reasonable to mix-and-match like that.

[Girish Kumar Prabhakar]

I am using struts2-json-plugin-2.1.8.1.jar for JSON plugin jar.

I am new to Struts2, so can you please explain your last line, or point out which plugins i am mixing and matching or using wrong versions.

Thanks David.

[David Newton]

If I asked you to list all the jars you're deploying, why isn't that one in the list?!

In any case: see all those Struts 2 jars? See how the versions aren't the same? That *will not work*.

[Girish Kumar Prabhakar]

Is the version of JSON plugin correct or there is some other version.

[David Newton]

YOU CANNOT MIX PLUGIN VERSIONS AS YOU ARE DOING NOW.

1) Do you see the Struts 2 jars you've listed?

I'll list them again for you:

struts2-core-2.1.6.jar
struts2-spring-plugin-2.0.11.2.jar
struts2-tiles-plugin-2.0.12.jar
struts2-json-plugin-2.1.8.1.jar

2) Do you see how the version numbers are different?

That won't work.

Use the version of the plugin that matches the version of Struts 2 you're using.