Problème Strut2 json-plugin

Bonjour.

J'ai une application Struts / hibernate .
Je souhaite faire de récupère le enregistrement d'une table sous formé d'un tableau JSON

Code de l'Action:

Code:

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public abstract class BeanAction  extends  ActionSupport {
       public String ListJson(){
		_ListBean = DAO.getList(); 
		return SUCCESS;
		}
       }

Struts.xml

Code:

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<package name="json"  namespace="/json"  extends="json-default"> 			
		<action name="Bean.ListJson" class="BeanAction" method="ListJson">
    		        <result name="success" type="json">
    			         <param name="contentType">text/html</param>
    			         <param name="noCache">true</param>
    			         <param name="ignoreHierarchy">false</param>
				<param name="excludeNullProperties">true</param>
				<param name="root">_ListBean</param>                 
			</result>
  		</action>
  	</package>

mais struts2 détecté l'exception :

Code:

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org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
 
    org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:243)
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
    org.apache.struts2.json.JSONWriter.array(JSONWriter.java:418)
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:155)
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
    org.apache.struts2.json.JSONWriter.write(JSONWriter.java:99)
    org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:112)
    org.apache.struts2.json.JSONResult.execute(JSONResult.java:198)
    com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:362)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
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java.sql.SQLException: Positioned Update not supported.
 
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1075)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:929)
    com.mysql.jdbc.ResultSetImpl.getCursorName(ResultSetImpl.java:2130)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:227)
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
    org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
    org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
    org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
    org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
    org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
    org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
    org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)

struts 2.1.8.1
Hibernate 3.3
json-lib-2.1