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 <[email protected]> > 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 > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > >
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