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how to handle this?
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created by <a href="https://community.jboss.org/people/zydzjy">yu zhou</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/827890#827890">View the full discussion</a>
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<div class="jive-rendered-content"><p> This is my task server:</p><pre class="jive-pre"><code class="jive-code jive-java">
<font color="navy"><b>import</b></font> java.util.HashMap;
<font color="navy"><b>import</b></font> java.util.Map;
<font color="navy"><b>import</b></font> javax.persistence.EntityManagerFactory;
<font color="navy"><b>import</b></font> javax.persistence.Persistence;
<font color="navy"><b>import</b></font> org.drools.KnowledgeBaseFactory;
<font color="navy"><b>import</b></font> org.drools.SystemEventListenerFactory;
<font color="navy"><b>import</b></font> org.drools.runtime.Environment;
<font color="navy"><b>import</b></font> org.drools.runtime.EnvironmentName;
<font color="navy"><b>import</b></font> org.jbpm.task.User;
<font color="navy"><b>import</b></font> org.jbpm.task.service.TaskService;
<font color="navy"><b>import</b></font> org.jbpm.task.service.TaskServiceSession;
<font color="navy"><b>import</b></font> org.jbpm.task.service.mina.MinaTaskServer;
<font color="navy"><b>import</b></font> bitronix.tm.resource.jdbc.PoolingDataSource;
 
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> JBPMTaskServer<font color="navy">{</font>
<font color="navy"><b>public</b></font> JBPMTaskServer() <font color="navy">{</font>
  <font color="darkgreen">// TODO Auto-generated constructor stub</font>
<font color="navy">}</font>
<font color="darkgreen">/**
  * @param args
  */</font>
<font color="navy"><b>public</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>void</b></font> main(String[] args) <font color="navy">{</font>
  <font color="darkgreen">// TODO Auto-generated method stub</font>
  setupDataSource();
  <font color="darkgreen">//String dialect = properties.getProperty("persistence.persistenceunit.dialect", "org.hibernate.dialect.H2Dialect");</font>
  Map<String, String> map = <font color="navy"><b>new</b></font> HashMap<String, String>();
  map.put(<font color="red">"hibernate.dialect"</font>, <font color="red">"org.hibernate.dialect.MySQL5Dialect"</font>);
        EntityManagerFactory emf = Persistence
    .createEntityManagerFactory(<font color="red">"org.jbpm.persistence.jpa"</font>,map);
  
<font color="darkgreen">/*  Environment env = KnowledgeBaseFactory.newEnvironment();
  env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);*/</font>
  TaskService taskService = <font color="navy"><b>new</b></font> TaskService(emf, SystemEventListenerFactory.getSystemEventListener());
  TaskServiceSession taskSession = taskService.createSession();
        <font color="darkgreen">// now register new users and groups</font>
        <font color="darkgreen">//taskSession.addUser(new User("mary"));</font>
        <font color="darkgreen">//taskSession.addUser(new User("john"));</font>
 
  MinaTaskServer server = <font color="navy"><b>new</b></font> MinaTaskServer( taskService );
  Thread thread = <font color="navy"><b>new</b></font> Thread( server );
  thread.start();
<font color="navy">}</font>
<font color="navy"><b>private</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>void</b></font> setupDataSource()<font color="navy">{</font>
  PoolingDataSource ds = <font color="navy"><b>new</b></font> PoolingDataSource();
  ds.setUniqueName(<font color="red">"jdbc/jbpm-ds"</font>);
  ds.setClassName(com.mysql.jdbc.jdbc2.optional.MysqlXADataSource.class
    .getName());
  ds.setMaxPoolSize(3);
  ds.setAllowLocalTransactions(<font color="navy"><b>true</b></font>);
  ds.getDriverProperties().put(<font color="red">"user"</font>, <font color="red">"jbossjbpm"</font>);
  ds.getDriverProperties().put(<font color="red">"password"</font>, <font color="red">"jbossjbpm"</font>);
  ds.getDriverProperties().put(<font color="red">"URL"</font>, <font color="red">"jdbc:mysql://localhost:3306/jbpm"</font>);
  <font color="darkgreen">// ds.getDriverProperties().put("driverClassName",</font>
  <font color="darkgreen">// "com.mysql.jdbc.Driver");</font>
  ds.init();
<font color="navy">}</font>
<font color="navy">}</font>
</code></pre><p> And this is my task client,</p><p>and i seprate this class into two projects:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">
<font color="navy"><b>import</b></font> java.util.HashMap;
<font color="navy"><b>import</b></font> java.util.Map;
<font color="navy"><b>import</b></font> javax.persistence.EntityManagerFactory;
<font color="navy"><b>import</b></font> javax.persistence.Persistence;
<font color="navy"><b>import</b></font> org.drools.KnowledgeBaseFactory;
<font color="navy"><b>import</b></font> org.drools.SystemEventListenerFactory;
<font color="navy"><b>import</b></font> org.drools.runtime.Environment;
<font color="navy"><b>import</b></font> org.drools.runtime.EnvironmentName;
<font color="navy"><b>import</b></font> org.jbpm.task.User;
<font color="navy"><b>import</b></font> org.jbpm.task.service.TaskService;
<font color="navy"><b>import</b></font> org.jbpm.task.service.TaskServiceSession;
<font color="navy"><b>import</b></font> org.jbpm.task.service.mina.MinaTaskServer;
<font color="navy"><b>import</b></font> bitronix.tm.resource.jdbc.PoolingDataSource;
 
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> JBPMTaskServer<font color="navy">{</font>
<font color="navy"><b>public</b></font> JBPMTaskServer() <font color="navy">{</font>
  <font color="darkgreen">// TODO Auto-generated constructor stub</font>
<font color="navy">}</font>
<font color="darkgreen">/**
  * @param args
  */</font>
<font color="navy"><b>public</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>void</b></font> main(String[] args) <font color="navy">{</font>
  <font color="darkgreen">// TODO Auto-generated method stub</font>
  setupDataSource();
  <font color="darkgreen">//String dialect = properties.getProperty("persistence.persistenceunit.dialect", "org.hibernate.dialect.H2Dialect");</font>
  Map<String, String> map = <font color="navy"><b>new</b></font> HashMap<String, String>();
  map.put(<font color="red">"hibernate.dialect"</font>, <font color="red">"org.hibernate.dialect.MySQL5Dialect"</font>);
        EntityManagerFactory emf = Persistence
    .createEntityManagerFactory(<font color="red">"org.jbpm.persistence.jpa"</font>,map);
  
<font color="darkgreen">/*  Environment env = KnowledgeBaseFactory.newEnvironment();
  env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);*/</font>
  TaskService taskService = <font color="navy"><b>new</b></font> TaskService(emf, SystemEventListenerFactory.getSystemEventListener());
  TaskServiceSession taskSession = taskService.createSession();
        <font color="darkgreen">// now register new users and groups</font>
        <font color="darkgreen">//taskSession.addUser(new User("mary"));</font>
        <font color="darkgreen">//taskSession.addUser(new User("john"));</font>
 
  MinaTaskServer server = <font color="navy"><b>new</b></font> MinaTaskServer( taskService );
  Thread thread = <font color="navy"><b>new</b></font> Thread( server );
  thread.start();
<font color="navy">}</font>
<font color="navy"><b>private</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>void</b></font> setupDataSource()<font color="navy">{</font>
  PoolingDataSource ds = <font color="navy"><b>new</b></font> PoolingDataSource();
  ds.setUniqueName(<font color="red">"jdbc/jbpm-ds"</font>);
  ds.setClassName(com.mysql.jdbc.jdbc2.optional.MysqlXADataSource.class
    .getName());
  ds.setMaxPoolSize(3);
  ds.setAllowLocalTransactions(<font color="navy"><b>true</b></font>);
  ds.getDriverProperties().put(<font color="red">"user"</font>, <font color="red">"jbossjbpm"</font>);
  ds.getDriverProperties().put(<font color="red">"password"</font>, <font color="red">"jbossjbpm"</font>);
  ds.getDriverProperties().put(<font color="red">"URL"</font>, <font color="red">"jdbc:mysql://localhost:3306/jbpm"</font>);
  <font color="darkgreen">// ds.getDriverProperties().put("driverClassName",</font>
  <font color="darkgreen">// "com.mysql.jdbc.Driver");</font>
  ds.init();
<font color="navy">}</font>
<font color="navy">}</font>
 
</code></pre><p>When i run these two classes,and threw the exception:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">1    15/07 09:30:33,936[main] ERROR workitem.wsht.GenericHTWorkItemHandler.executeWorkItem  - Mon Jul 15 09:30:33 CST 2013: Error when creating task on task server <font color="navy"><b>for</b></font> work item id 7. Error reported by task server: Command AddTaskRequest faild due to Could not commit transaction. Please contact task server administrator.
java.lang.RuntimeException: Command AddTaskRequest faild due to Could not commit transaction. Please contact task server administrator.
at org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:729)
at org.jbpm.task.service.mina.MinaTaskServerHandler.messageReceived(MinaTaskServerHandler.java:41)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:716)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:427)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:245)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
at org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:177)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:692)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:645)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:634)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:66)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1078)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Process started ...7
 
</code></pre></div>
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