[rules-users] Persistence.createEntityManagerFactory NullPointerException
Gustavo Tenrreiro
gustavo at tenrreiro.com
Fri Sep 3 11:49:24 EDT 2010
If it helps at all; I spent almost a full week trying to get JPA to
work with Tomcat 5.5 + Hibernate + Bitronix and this is what I found.
The instructions for Bitronix in
http://docs.codehaus.org/display/BTM/Tomcat13 did not help me much.
The datasource that gets created via the resource.properties could
never be found.
- So to get it to work, do deploy the Bitronix jar files into your
server / context
- In the Tomcat conf/context.xml I do have "<Transaction
factory="bitronix.tm.BitronixUserTransactionObjectFactory" />" but I
am not sure if it is required ( haven't tested removing it ).
- In the web.xml I do have:
<resource-env-ref>
<resource-env-ref-name>java:comp/env/jdbc/processInstanceDS</resource-env-ref-name>
<resource-env-ref-type>javax.sql.DataSource</resource-env-ref-type>
</resource-env-ref>
where jdbc/processInstanceDS is your jdbc/mysql
- In the Hibernate persistence.xml I do have:
<property name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.BTMTransactionManagerLookup" />
<property name="hibernate.jndi.class"
value="bitronix.tm.jndi.BitronixInitialContextFactory" />
although I don't think it is using the jndi.class specified there, so
the second line might be redundant.
Then in my code I create the datasource by hand ( in a ServletContextListener ):
PoolingDataSource ds = new PoolingDataSource();
ds.setUniqueName( "jdbc/processInstanceDS" );
ds.setClassName( "bitronix.tm.resource.jdbc.lrc.LrcXADataSource");
ds.setMaxPoolSize( 3 );
ds.setAllowLocalTransactions( true );
ds.getDriverProperties().put("driverClassName","com.microsoft.sqlserver.jdbc.SQLServerDriver");
ds.getDriverProperties().put( "user", "xxxxxxx" );
ds.getDriverProperties().put( "password", "xxxxxxxx" );
ds.getDriverProperties().put( "url", "mySqlServerUrl..." );
replace the driverClassName, user, password, and url for your setup. I
am using SQLServer, but I guess you are on MySql.
After that the JPA stuff works, and persistence works as advertised.
This is the only setup that worked for me. I tried creating the
datasource from Spring but that didn't work either.
Please let me know what you find out.
Thanks
2010/9/3 Pablo Nussembaum <baunax at gmail.com>:
> You need to configure bitronix[0] to provide JTA. Or use drools-spring that
> allows you to use drools-persisntece-jpa without JTA.
>
> [0] http://docs.codehaus.org/display/BTM/Tomcat13
> On 09/03/2010 08:53 AM, liang wrote:
>
> 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 at 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 at 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 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
>>>>
>>>> _______________________________________________
>>>> rules-users mailing list
>>>> rules-users at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>
>>>
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>>
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