Using Persistence
Hi Everyone,
I am trying to understand/learn persistence but have been unsuccessful as there aren't good guides on how to get started. I have been following the documentation online as well as examples found throughout the forums but nothing has been fruitful.
Can anyone point me to a step by step guide for using persistence from a simple task with a log to viewing this log within the database through a GUI?
I have created a persistence.xml file and this is how I have set-up my environment.
JBPMHelper.startH2Server();
JBPMHelper.setupDataSource();
EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.jbpm.domain");
RuntimeEnvironment environment = RuntimeEnvironmentBuilder.Factory.get().newEmptyBuilder().entityManagerFactory(emf)
//.knowledgeBase(kbase)
.addAsset(ResourceFactory.newClassPathResource("newRule.drl"), ResourceType.DRL)
.addAsset(ResourceFactory.newClassPathResource("sample.bpmn"), ResourceType.BPMN2).get();
RuntimeManager manager = RuntimeManagerFactory.Factory.get().newSingletonRuntimeManager(environment);
RuntimeEngine runtime = manager.getRuntimeEngine(EmptyContext.get());
KieSession ksession = runtime.getKieSession();
With my persistence.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence
version="2.0"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd
http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_2_0.xsd"
xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<persistence-unit name="org.jbpm.domain" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>jdbc/jbpm-ds</jta-data-source>
<mapping-file>META-INF/JBPMorm.xml</mapping-file>
<class>org.drools.persistence.info.SessionInfo</class>
<class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
<class>org.drools.persistence.info.WorkItemInfo</class>
<class>org.jbpm.persistence.correlation.CorrelationKeyInfo</class>
<class>org.jbpm.persistence.correlation.CorrelationPropertyInfo</class>
<class>org.jbpm.runtime.manager.impl.jpa.ContextMappingInfo</class>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
<property name="hibernate.max_fetch_depth" value="3"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.transaction.jta.platform"
value="org.hibernate.service.jta.platform.internal.BitronixJtaPlatform"/>
</properties>
</persistence-unit>
</persistence>
I was wondering where I can find the H2 database that I will be persisting my information? I haven't told the program to store anything yet but as I understand it there is a GUI that allows me to view the the entries that are currently held within the H2?
When I try to access localhost:8080, I have my Jboss AS 7 Server console up since I followed the installer on the documentation page and it starts up this server for me. Is the H2 Embedded into the AS 7 console somehow?
Also, I ran a sample maven project which will also start the H2 server and execute a task. But where can I see the result if I cannot access the H2 server.
JBPMHelper.startH2Server();
JBPMHelper.setupDataSource();
EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.jbpm.persistence.jpa");
RuntimeEnvironmentBuilder builder = RuntimeEnvironmentBuilder.Factory.get()
.newDefaultBuilder().entityManagerFactory(emf)
.knowledgeBase(kbase);
return RuntimeManagerFactory.Factory.get()
.newSingletonRuntimeManager(builder.get(), "com.sample:example:1.0");
}
// let john execute Task 1
List<TaskSummary> list = taskService.getTasksAssignedAsPotentialOwner("john", "en-UK");
TaskSummary task = list.get(0);
System.out.println("John is executing task " + task.getName());
taskService.start(task.getId(), "john");
taskService.complete(task.getId(), "john", null);
