Do you really need a JTA transaction?

Can you not re-configure your persistence unit to use a RESOURCE_LOCAL transaction?

Googling shows you're not alone with wanting (but not necessarily needing) JTA in Tomcat...

2010/9/3 liang <zhuyx808@gmail.com>
i found that tomcat 6 have not JTA,which server is able to persistence?

在 2010年9月3日 下午12:02，liang <zhuyx808@gmail.com>写道：
THS,Esteban,I found it which is resin's problem, so i replaced it to tomcat6, i got other questions:

 in my webapp webroot/meta-inf/content.xml:
<?xml version="1.0" encoding="UTF-8"?>
<Context>
  <Resource name="jdbc/mysql" auth="Container" type="javax.sql.DataSource"
               maxActive="10" maxIdle="2" maxWait="10000" logAbandoned="true"
               username="root" password="111111" driverClassName="com.mysql.jdbc.Driver"
               url="jdbc:mysql://localhost:3306/test"/>
</Context>

webroot/web-inf/web.xml:

 <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/mysql</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
</resource-ref>

webroot/meta-inf/persistence.xml:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence
    version="1.0"
    xsi:schemaLocation=
        "http://java.sun.com/xml/ns/persistence
         http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
         http://java.sun.com/xml/ns/persistence/orm
         http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
    xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/persistence">

 <!--persistence-unit name="ProcessService">
  <jta-data-source>java:/DefaultDS</jta-data-source>
  <properties>
   <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
  </properties>
 </persistence-unit-->


    <persistence-unit name="org.drools.persistence.jpa" transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:comp/env/jdbc/mysql</jta-data-source>       
    <class>org.drools.persistence.session.SessionInfo</class>
 <class>org.drools.persistence.processinstance.ProcessInstanceInfo</class>
    <class>org.drools.persistence.processinstance.ProcessInstanceEventInfo</class>
    <class>org.drools.persistence.processinstance.WorkItemInfo</class>
   

        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>           
            <property name="hibernate.max_fetch_depth" value="3"/>
            <property name="hibernate.hbm2ddl.auto" value="create" />
            <property name="hibernate.show_sql" value="true" />   
            <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup" />
        </properties>       
    </persistence-unit>
   
</persistence>

webroot/testJNDI.jsp:

<%@ page import='java.sql.*, javax.sql.*, javax.naming.*' %>
<%
Context ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup("java:comp/env/jdbc/mysql");

Connection conn = ds.getConnection();

try {
  Statement stmt = conn.createStatement();
  ResultSet rs = stmt.executeQuery("select * from test");
  while (rs.next()) { %>
<%= rs.getString(1) %> <%= rs.getString(2) %><br><%
  }
} finally {
  conn.close();
}
%>

webroot/testDroolsFlow.jsp:

<%@ page import='java.sql.*, javax.sql.*, javax.naming.*,com.abc.*' %>
<%
VdcService.exec();
%>

run the testJNDI.jsp,its OK.when i run testDroolsFlow.jsp, appears this exception:

java.lang.RuntimeException: Could not commit session
    at org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:119)
    at org.drools.persistence.jpa.impl.JPAKnowledgeServiceProviderImpl.newStatefulKnowledgeSession(JPAKnowledgeServiceProviderImpl.java:44)
    at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:93)
    at com.abc.VdcService.exec(VdcService.java:39)
    at org.apache.jsp._testDroolsFlow_jsp._jspService(_testDroolsFlow_jsp.java:60)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    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:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    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:298)
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)

    at java.lang.Thread.run(Thread.java:619)
Caused by: javax.naming.NamingException: Cannot create resource instance
    at org.apache.naming.factory.TransactionFactory.getObjectInstance(TransactionFactory.java:113)
    at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:793)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:140)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:781)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
    at org.apache.naming.SelectorContext.lookup(SelectorContext.java:152)
    at javax.naming.InitialContext.lookup(InitialContext.java:392)
    at org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:102)
    ... 22 more

JNDI is OK,so i guess the question is in drools side,is right of my guess? the exception is here:
38          StatefulKnowledgeSession ksession =
39                  JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );



PS:

i write the webapp  is want to know:

1.       How to save drools into database

2.       What data is saved in the tables; are all the instances of a process stored?

3.       Are all nodes in a ruleflow saved?

4.       Are there any nodes which are not running saved in the tables?

5.       What status are running and non-running nodes in the tables?



2010/9/1 Esteban Aliverti <esteban.aliverti@gmail.com>

As far as I can see, this has nothing to do with drools. You can't even create the EntityManagerFactory. Try to set a finest log level for com.caucho.amber.* and org.hibernate.* to see why it is throwing a NPE. 

Best,

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


2010/9/1 亮亮 <zhuyx808@gmail.com>
hi:

in my webapp, I use JPA to store the runtime state,i use this code in VdcService.java which is a sample  java class:

EntityManagerFactory emf =Persistence.createEntityManagerFactory( "org.drools.persistence.jpa" );
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );

 // create a new knowledge session that uses JPA to store the runtime state
StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );

I put persistence.xml to webRoot/META-INF/  , persistence.xml:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence
    version="1.0"
    xsi:schemaLocation=
        "http://java.sun.com/xml/ns/persistence
         http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
         http://java.sun.com/xml/ns/persistence/orm
         http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
    xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/persistence">

    <persistence-unit name="org.drools.persistence.jpa" transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:comp/env/jdbc/mysql</jta-data-source>       
    <class>org.drools.persistence.session.SessionInfo</class>
 <class>org.drools.persistence.processinstance.ProcessInstanceInfo</class>
    <class>org.drools.persistence.processinstance.ProcessInstanceEventInfo</class>
    <class>org.drools.persistence.processinstance.WorkItemInfo</class>
   

        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>           
            <property name="hibernate.max_fetch_depth" value="3"/>
            <property name="hibernate.hbm2ddl.auto" value="create" />
            <property name="hibernate.show_sql" value="true" />   
            <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup" />
        </properties>       
    </persistence-unit>
   
</persistence>

I use resin 3.1.10,  $resin-home/conf/resin.conf:

           <database>
           <jndi-name>jdbc/mysql</jndi-name>
           <driver type="org.gjt.mm.mysql.Driver">
             <url>jdbc:mysql://127.0.0.1:3306/test</url>
             <user>root</user>
             <password></password>
            </driver>
            <prepared-statement-cache-size>8</prepared-statement-cache-size>
            <max-connections>20</max-connections>
            <max-idle-time>30s</max-idle-time>
          </database>

when i run this webapp , i got this exception:

java.lang.NullPointerException
    at com.caucho.amber.manager.AmberPersistenceProvider.createEntityManagerFactory(AmberPersistenceProvider.java:65)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:69)
    at com.abc.abc.service.VdcService.exec(VdcService.java:32)
    at com.abc.abc.resources.Apply.apply(Apply.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:156)
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:208)
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:75)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:115)
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:67)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:724)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:689)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:680)
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:324)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:425)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:604)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
    at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
    at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:416)
    at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
    at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99)
    at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
    at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
    at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265)
    at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:273)
    at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682)
    at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:743)
    at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:662)
    at java.lang.Thread.run(Thread.java:619)

i can't solve it.How to solve it?help me ,THS

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