Struts 2 Json结果Hibernate LazyInitialization - 如何在休眠会话中反序列化 [英] Struts 2 Json Result Hibernate LazyInitialization - How to deserialize within a hibernate session
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问题描述
我试图在Struts2中实现一个Hibernate会话/事务拦截器来避免json结果 LazyInitializationException ，但我仍然得到这个异常：
245968 [http-8080-7] ERROR util.HibernateEndTransInterceptor - org.apache.struts2.json.JSONException：org.apache.struts2.json.JSONException ：org.apache.struts2.json.JSONException：org.apache.struts2.json.JSONException：java.lang.reflect.InvocationTargetException
org.apache.struts2.json.JSONException：org.apache.struts2.json。 JSONException：org.apache.struts2.json.JSONException：org.apache.struts2.json.JSONException：java.lang.reflect.InvocationTargetException $ b $ org.apache.struts2.json.JSONWriter.bean（JSONWriter.java：
at org.apache.struts2.json.JSONWriter.processCustom（JSONWriter.java:171）
at org.apache.struts2.json.JSONWriter.process（JSONWriter.java:161）
at org.apache.struts2.json.JSONWriter.value（JSONWriter.java:127）
at org .apache.struts2.json.JSONWriter.write（JSONWriter.java:95）
at org.apache.struts2.json.JSONUtil.serialize（JSONUtil.java:116）
at org.apache.struts2 .json.JSONResult.createJSONString（JSONResult.java:196）
at org.apache.struts2.json.JSONResult.execute（JSONResult.java:170）
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult （DefaultActionInvocation.java:374）
在com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:278）
在util.HibernateEndTransInterceptor.intercept（HibernateEndTransInterceptor.java:55）
。在com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept（DebuggingInterceptor.java:256）
at com.opensymphony。 xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept（ DefaultWorkflowInterceptor.java:176）美元，com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:98 B $ B）
在com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept（ValidationInterceptor.java:265）
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept（AnnotationValidationInterceptor.java:68）
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:98）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony .xwork2.interceptor.ConversionErrorInterceptor.intercept（ConversionErrorInterceptor.java:138）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.interceptor.Parameter sInterceptor.doIntercept（ParametersInterceptor.java:236）
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:98）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation。 java：249）
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept（ParametersInterceptor.java:236）
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:98）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept（StaticParametersInterceptor.java:190）
at com .opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
在org.apache.struts2.interceptor.MultiselectInterceptor.intercept（MultiselectInterceptor.java:75）
在com.opensymphony.xwork2.DefaultActionInvocation .invo （DefaultActionInvocation.java:249）
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept（CheckboxInterceptor.java:90）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java： 249）
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept（FileUploadInterceptor.java:243）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
在com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept（ModelDrivenInterceptor.java:100）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2 .interceptor.ScopedModelDrivenInterceptor.intercept（ScopedModelDrivenInterceptor.java:141）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept （ChainingInterceptor.java:145）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept（PrepareInterceptor.java:171）
at com.opensymphony .xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:98）
在com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
在com.opensymphony.xwork2.interceptor.I18nInterceptor .intercept（I18nInterceptor.java:176）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept（ServletConfigInterceptor.java ：164）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept（AliasInterceptor.java:192）
在com.opensymphony.xwork2.DefaultActionInvocation。调用（DefaultActionInvocation.java:249）
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept（ExceptionMappingInterceptor.java:187）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java： 249）
在util.HibernateBeginTransInterceptor.intercept（HibernateBeginTransInterceptor.java:32）
在com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
在util.LoginInterceptor.intercept （LoginInterceptor.java:36）
at com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:249）
at org.apache.struts2.impl.StrutsActionProxy.execute（StrutsActionProxy.java:54 ）
at org.apache.struts2.dispatcher.Dispatcher.serviceAction（Dispatcher.java:511）
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction（ExecuteOperations.java:77）
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.d oFilter（StrutsPrepareAndExecuteFilter.java:91）
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:202）
at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain。 java：173）
at org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:213）
at org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:178）
at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:126）
at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:105）
在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:107）
at org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:148）
at org.apache .coyote.http11.Http11AprProcessor.process（Http11AprProcessor.java:831）
at org.apache.coyote.http11.Http11AprProtocol $ Http11ConnectionHandler.process（Http11A $ java.util.run（Thread.java：652） 722）
导致：org.apache.struts2.json.JSONException：org.apache.struts2.json.JSONException：org.apache.struts2.json.JSONException：java.lang.reflect.InvocationTargetException
在org.apache.struts2.json.JSONWriter.bean（JSONWriter.java:238）
at org.apache.struts2.json.JSONWriter.processCustom（JSONWriter.java:171）
at org.apache .struts2.json.JSONWriter.process（JSONWriter.java:161）
at org.apache.struts2.json.JSONWriter.value（JSONWriter.java:127）
at org.apache.struts2.json .JSONWriter.add（JSONWriter.java:363）
at org.apache.struts2.json.JSONWriter.bean（JSONWriter.java:223）
... 73 more
引起： org.apache.struts2.json.JSONException：org.apache.struts2.json.JSONException：java.lang.reflect.InvocationTargetException $ b $ org.apache.struts2.json.JSONWriter.bean（JSONWr iter.java:238）
at org.apache.struts2.json.JSONWriter.processCustom（JSONWriter.java:171）
at org.apache.struts2.json.JSONWriter.process（JSONWriter.java： ）
at org.apache.struts2.json.JSONWriter.value（JSONWriter.java:127）
at org.apache.struts2.json.JSONWriter.add（JSONWriter.java:363）
at org.apache.struts2.json.JSONWriter.bean（JSONWriter.java:223）
... 78 more
引起：org.apache.struts2.json.JSONException：java.lang .reflect.InvocationTargetException
at org.apache.struts2.json.JSONWriter.bean（JSONWriter.java:238）
at org.apache.struts2.json.JSONWriter.processCustom（JSONWriter.java:171）
at org.apache.struts2.json.JSONWriter.process（JSONWriter.java:161）
at org.apache.struts2.json.JSONWriter.value（JSONWriter.java:127）
at org.apache.struts2.json.JSONWriter.add（JSONWriter.java:363）
at org.apache.struts2.json.JSONWriter.bean（JSONWriter.java:223）
... 83更多
引起：j ava.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）
at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57）
at sun.reflect .DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
at java.lang.reflect.Method.invoke（Method.java:601）
at org.apache.struts2.json.JSONWriter.bean（JSONWriter .java：218）
... 88 more
导致：org.hibernate.LazyInitializationException：无法初始化代理 - 没有会话
在org.hibernate.proxy.AbstractLazyInitializer.initialize（AbstractLazyInitializer .java：165）
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation（AbstractLazyInitializer.java:272）
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke（JavassistLazyInitializer.java:185 ）
at com.lm.model.common.Language _ $$ _ javassist_0.getName（Language _ $$ _ javassist_0.java）
... 93 more
My Interceptor看起来像这样：
package util;
import java.util.Map;
导入org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
导入util.hibernate.HibernateUtil;
import com.lm.action.ActionsConstants;
import com.lm.action.user.Constants;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class HibernateEndTransInterceptor实现了Interceptor，Constants，ActionsConstants {
private static final long serialVersionUID = -8734958511612355789L;
private static SessionFactory sessionFactory = HibernateUtil.getSessionFactory（）;
private transient Logger log = Logger.getLogger（HibernateEndTransInterceptor.class）;
private Session s = null;
私人交易t = null;
@Override
public void destroy（）{
}
@Override
public void init（）{
}
@Override
public String intercept（final ActionInvocation invocation）throws Exception {
/*invocation.addPreResultListener(new PreResultListener（）{
@Override
public void beforeResult（ActionInvocation arg0，String arg1）{
Map< String，ResultConfig> resultsMap = invocation.getProxy（）.getConfig（）。getResults（）;
// ResultConfig finalResultConfig = resultsMap.get（resultCode）;
}
}）; * /
Map< String，Object> strutsSession = invocation.getInvocationContext（）。getSession（）;
String res = null;
尝试{
s = sessionFactory.openSession（）;
t = s.beginTransaction（）;
strutsSession.put（hibernateSession，s）;
strutsSession.put（hibernateTransaction，t）;
res = invocation.invoke（）;
t.commit（）;
} catch（Throwable t2）{
log.error（t2，t2）;
尝试{
t.rollback（）;
} catch（Throwable t3）{
log.error（t3，t3）;
}
} finally {
try {
s.close（）;
} catch（Throwable t）{
log.error（t，t）;
}
strutsSession.remove（hibernateSession）;
strutsSession.remove（hibernateTransaction）;
}
return res;
这不起作用，即使在 trans.commit（）和 session.close（）之前获得 LazyInitializationException / code>
解决方案好了，终于我解决了添加注入通用DAO（使用会话和事务）一个genericAction。这适用于JSONResults& jsp's with lazy hibernate beans。
感谢您对bmorris591和Roman C的贡献（我不想，甚至需要所有插件） p>
我留下我的例子，我希望我不会忘记任何东西......
拦截器配置（struts.xml片段）：
< package name =lmpextends =struts-default，json-default>
<拦截器>
< interceptor name =loginclass =util.LoginInterceptor/>
< interceptor name =hibernateSessionTransInjectorclass =util.HibernateSessionTransInjectorInterceptor/>
< interceptor-stack name =loggingStack>
< interceptor-ref name =login/>
< interceptor-ref name =defaultStack/>
< interceptor-ref name =hibernateSessionTransInjector/>
< / interceptor-stack>
< /拦截器>
< default-interceptor-ref name =loggingStack/>
< global-results>
< result name =logintype =redirectAction>登入< / result>
< / global-results>
< / package>
< package name =myActionextends =lmp>
< param name =ignoreHierarchy> false< / param>
< / result>
< result name =*> /jsp/myAction.jsp< / result>
< / action>
< / package>
拦截器实现：
package util;
导入org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
导入util.hibernate.HibernateUtil;
import com.lm.action.ActionsConstants;
import com.lm.action.user.Constants;
import com.lm.dao.DAO;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class HibernateSessionTransInjectorInterceptor实现了Interceptor，Constants，ActionsConstants {
private static final long serialVersionUID = -8734958511612355789L;
private static SessionFactory sessionFactory = HibernateUtil.getSessionFactory（）;
私有临时记录器日志= Logger.getLogger（HibernateSessionTransInjectorInterceptor.class）;
@Override
public void destroy（）{
}
@Override
public void init（）{
}
@Override
public String intercept（final ActionInvocation invocation）throws Exception {
String res = null;
DAO dao = null;
尝试{
Session s = sessionFactory.openSession（）;
dao =新的DAO（s）;
dao.beginTransaction（）;
** invocation.getStack（）。setValue（dao，dao，true）; **
res = invocation.invoke（）;
boolean rollback =（Boolean）invocation.getStack（）。findValue（rollbackTransaction，Boolean.class）;
if（rollback）
dao.rollBackTransaction（）;
if（！dao.getT（）。wasRolledBack（））
dao.commitTransaction（）;
} catch（Throwable t2）{
log.error（t2，t2）;
if（dao！= null）
try {
dao.rollBackTransaction（）;
} catch（Throwable t3）{
log.error（t3，t3）;
}
} finally {
if（dao！= null）
try {
dao.finallyClose（）;
} catch（Throwable t）{
log.error（t，t）;
}
}
return res;
}
}
UserDAO示例：
public class UserDAO extends DAO {
[...]
public UserDAO（Session s）{
super（s）;
}
[...]
}
GenericDAO示例：
public class DAO {
保护静态最终瞬态Logger log = Logger.getLogger（DAO。类）;
public static SessionFactory sessionFactory = HibernateUtil.getSessionFactory（）;
public Session s = null;
公共交易t = null;
public DAO（Session s）{
this.s = s;
}
public void beginTransaction（Transaction t）{
this.t = t;
}
private int exceptionErr = 0;
public void beginTransaction（）{
try {
t = s.beginTransaction（）;
} catch（Throwable t）{
log.error（t，t）;
public void rollBackTransaction（）{
if（t！= null& t.isActive（））
t.rollback（）;
public void commitTransaction（）{
if（t！= null&& t.isActive（））
t.commit（）;
$ b $ public void finallyClose（）{
if（t！= null& t.isActive（））
t.rollback（）;
if（s！= null&& s.isOpen（））
s.close（）;
}
public Session getS（）{
return s;
}
public void setS（Session s）{
this.s = s;
}
公共交易getT（）{
return t;
}
public void setT（Transaction t）{
this.t = t;
$ b code
$ b GenericAction public class GenericAction extends ActionSupport {
private DAO dao = null; // Interceptor注入
public GenericAction（）{
}
...
@JSON（deserialize = false，serialize = false）
public DAO getDao（）{
return dao;
}
@JSON（deserialize = false，serialize = false）
public void setDao（DAO dao）{
this.dao = dao;
}
}
MyAction：
public class MyAction extends GenericAction {
public MyAction（）{
}
@Override
public String execute（）抛出异常{
super.execute（）;
UserDAO userDAO = new UserDAO（getDao（）。getS（））;
OtherDAO otherDAO = new OtherDAO（getDao（）。getS（））;
userDAO.loadUsers（...）;
返回SUCCESS;
}
}
I'm trying to implement a Hibernate session/transaction interceptor to avoid LazyInitializationException on json results in Struts2, but I get this exception anyway:
245968 [http-8080-7] ERROR util.HibernateEndTransInterceptor - org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:238)
at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:171)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:161)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:127)
at org.apache.struts2.json.JSONWriter.write(JSONWriter.java:95)
at org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:116)
at org.apache.struts2.json.JSONResult.createJSONString(JSONResult.java:196)
at org.apache.struts2.json.JSONResult.execute(JSONResult.java:170)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:374)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:278)
at util.HibernateEndTransInterceptor.intercept(HibernateEndTransInterceptor.java:55)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at util.HibernateBeginTransInterceptor.intercept(HibernateBeginTransInterceptor.java:32)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at util.LoginInterceptor.intercept(LoginInterceptor.java:36)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:831)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:652)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1203)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:238)
at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:171)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:161)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:127)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:363)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:223)
... 73 more
Caused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:238)
at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:171)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:161)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:127)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:363)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:223)
... 78 more
Caused by: org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:238)
at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:171)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:161)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:127)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:363)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:223)
... 83 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:218)
... 88 more
Caused by: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:165)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:272)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
at com.lm.model.common.Language_$$_javassist_0.getName(Language_$$_javassist_0.java)
... 93 more
My Interceptor looks like this:
package util;
import java.util.Map;
import org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import util.hibernate.HibernateUtil;
import com.lm.action.ActionsConstants;
import com.lm.action.user.Constants;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class HibernateEndTransInterceptor implements Interceptor, Constants, ActionsConstants {
private static final long serialVersionUID = -8734958511612355789L;
private static SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
private transient Logger log = Logger.getLogger(HibernateEndTransInterceptor.class);
private Session s=null;
private Transaction t=null;
@Override
public void destroy() {
}
@Override
public void init() {
}
@Override
public String intercept(final ActionInvocation invocation) throws Exception {
/*invocation.addPreResultListener(new PreResultListener() {
@Override
public void beforeResult(ActionInvocation arg0, String arg1) {
Map<String, ResultConfig> resultsMap = invocation.getProxy().getConfig().getResults();
//ResultConfig finalResultConfig = resultsMap.get(resultCode);
}
});*/
Map<String,Object> strutsSession = invocation.getInvocationContext().getSession();
String res=null;
try {
s=sessionFactory.openSession();
t = s.beginTransaction();
strutsSession.put("hibernateSession", s);
strutsSession.put("hibernateTransaction", t);
res=invocation.invoke();
t.commit();
} catch (Throwable t2) {
log.error(t2,t2);
try {
t.rollback();
} catch (Throwable t3) {
log.error(t3,t3);
}
} finally {
try {
s.close();
} catch (Throwable t) {
log.error(t,t);
}
strutsSession.remove("hibernateSession");
strutsSession.remove("hibernateTransaction");
}
return res;
}
}
This is not working, I'm getting LazyInitializationException even before trans.commit() and session.close();
解决方案 Ok, finally I've solved adding injection of generic DAO (with session and transaction) to a genericAction. This works for JSONResults & jsp's with lazy hibernate beans.
Thanks for contributions to "bmorris591" and "Roman C" (I don't want, even need, all this plugin).
I leave my examples, I hope I don't forget anything...
Interceptor configuration (struts.xml fragment):
<package name="lmp" extends="struts-default,json-default">
<interceptors>
<interceptor name="login" class="util.LoginInterceptor"/>
<interceptor name="hibernateSessionTransInjector" class="util.HibernateSessionTransInjectorInterceptor"/>
<interceptor-stack name="loggingStack">
<interceptor-ref name="login" />
<interceptor-ref name="defaultStack" />
<interceptor-ref name="hibernateSessionTransInjector"/>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="loggingStack"/>
<global-results>
<result name="login" type="redirectAction">login</result>
</global-results>
</package>
<package name="myAction" extends="lmp">
<action name="myAction" class="com.lmp.MyAction">
<result name="json" type="json">
<param name="ignoreHierarchy">false</param>
</result>
<result name="*">/jsp/myAction.jsp</result>
</action>
</package>
Interceptor implementation:
package util;
import org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import util.hibernate.HibernateUtil;
import com.lm.action.ActionsConstants;
import com.lm.action.user.Constants;
import com.lm.dao.DAO;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class HibernateSessionTransInjectorInterceptor implements Interceptor, Constants, ActionsConstants {
private static final long serialVersionUID = -8734958511612355789L;
private static SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
private transient Logger log = Logger.getLogger(HibernateSessionTransInjectorInterceptor.class);
@Override
public void destroy() {
}
@Override
public void init() {
}
@Override
public String intercept(final ActionInvocation invocation) throws Exception {
String res=null;
DAO dao=null;
try {
Session s=sessionFactory.openSession();
dao = new DAO(s);
dao.beginTransaction();
**invocation.getStack().setValue("dao", dao, true);**
res=invocation.invoke();
boolean rollback=(Boolean)invocation.getStack().findValue("rollbackTransaction", Boolean.class);
if (rollback)
dao.rollBackTransaction();
if (!dao.getT().wasRolledBack())
dao.commitTransaction();
} catch (Throwable t2) {
log.error(t2,t2);
if (dao!=null)
try {
dao.rollBackTransaction();
} catch (Throwable t3) {
log.error(t3,t3);
}
} finally {
if (dao!=null)
try {
dao.finallyClose();
} catch (Throwable t) {
log.error(t,t);
}
}
return res;
}
}
UserDAO example:
public class UserDAO extends DAO {
[...]
public UserDAO(Session s) {
super(s);
}
[...]
}
GenericDAO example:
public class DAO {
protected static final transient Logger log = Logger.getLogger(DAO.class);
public static SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
public Session s = null;
public Transaction t = null;
public DAO(Session s) {
this.s=s;
}
public void beginTransaction(Transaction t) {
this.t=t;
}
private int exceptionErr=0;
public void beginTransaction() {
try {
t=s.beginTransaction();
} catch (Throwable t) {
log.error(t,t);
}
}
public void rollBackTransaction() {
if (t!=null && t.isActive())
t.rollback();
}
public void commitTransaction() {
if (t!=null && t.isActive())
t.commit();
}
public void finallyClose() {
if (t!=null && t.isActive())
t.rollback();
if (s!=null && s.isOpen())
s.close();
}
public Session getS() {
return s;
}
public void setS(Session s) {
this.s = s;
}
public Transaction getT() {
return t;
}
public void setT(Transaction t) {
this.t = t;
}
}
GenericAction:
public class GenericAction extends ActionSupport {
private DAO dao=null; //Interceptor injects here
public GenericAction() {
}
...
@JSON(deserialize=false, serialize=false)
public DAO getDao() {
return dao;
}
@JSON(deserialize=false, serialize=false)
public void setDao(DAO dao) {
this.dao = dao;
}
}
MyAction:
public class MyAction extends GenericAction {
public MyAction() {
}
@Override
public String execute() throws Exception {
super.execute();
UserDAO userDAO=new UserDAO(getDao().getS());
OtherDAO otherDAO=new OtherDAO(getDao().getS());
userDAO.loadUsers(...);
return SUCCESS;
}
}
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