[rules-users] Persistence.createEntityManagerFactory NullPointerException

[Esteban Aliverti]

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 at 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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