EJB deployment in Apache TomEE using Hibernate Persistence Provider and MySQL DB - mysql

Question

I'm facing a problem in configuration for a project what is build on EJB 3.0 technology. As the server container i'm using Apache TomEE v.7.0 with (with built in OpenEJB module), MySQL database and hibernate as the persistence provider.
Below is my configuration files:
tomee.xml
<?xml version="1.0" encoding="UTF-8"?>
<tomee>
<Resource id="lrsDataSource" type="javax.sql.DataSource">
JdbcDriver com.mysql.jdbc.Driver
JdbcUrl jdbc:mysql://localhost:3306/lbrentalservice
UserName root
Password 123456
JtaManaged true
</Resource>
</tomee>
persistence.xml
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="lrs-unit" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>lrsDataSource</jta-data-source>
<non-jta-data-source>lrsDataSourceUnmanaged</non-jta-data-source>
<class>edu.drg.entity.Book</class>
<class>edu.drg.entity.Category</class>
<class>edu.drg.entity.Person</class>
<class>edu.drg.entity.RentActivity</class>
<properties>
<property name="hibernate.hbm2ddl.auto" value="create"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.query.factory_class"
value="org.hibernate.hql.internal.classic.ClassicQueryTranslatorFactory" />
<property name="hibernate.transaction.manager_lookup_class"
value="org.apache.openejb.hibernate.TransactionManagerLookup"/>
</properties>
</persistence-unit>
</persistence>
Person entity (other entities are similar)
#Entity
#Table (name="person", uniqueConstraints = { #UniqueConstraint(columnNames = "prs_id")})
#NamedQueries({
#NamedQuery(name="findAllPersons", query = "SELECT p FROM Person p")
})
public class Person implements IPerson, Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private Long personId;
private String personName;
private String personSurname;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="prs_id")
public Long getPersonId() {
return personId;
}
public void setPersonId(Long personId) {
this.personId = personId;
}
#Column(name="name")
public String getPersonName() {
return personName;
}
public void setPersonName(String personName) {
this.personName = personName;
}
#Column(name="surname")
public String getPersonSurname() {
return personSurname;
}
public void setPersonSurname(String personSurname) {
this.personSurname = personSurname;
}
#Override
public String toString() {
return "Person [personId=" + personId + ", personName=" + personName
+ ", personSurname=" + personSurname + "]";
}
}
ManagerBean
#Stateless(name="LRSManager")
public class LRSManagerBean implements LRSManager{
#Resource(name="lrsDataSource")
DataSource ds;
#PersistenceContext(unitName="lrs-unit")
private EntityManager entityManager;
#Resource
private SessionContext sessionContext;
private static final Log logger = LogFactory.getLog(LRSManagerBean.class);
#Override
public void addBook (IBook book) {
entityManager.persist(book);
}
#Override
public List<IPerson> getAllPersons() {
System.out.println("Is entityManager not null: "+entityManager!=null);
List<IPerson> allPersons = null;
try {
final Query query = entityManager.createNamedQuery("findAllPersons");
allPersons = query.getResultList();
} catch (PersistenceException e) {
e.printStackTrace();
}
return allPersons;
}
Local interface:
import javax.ejb.Local;
import edu.drg.interfaces.ILRSManager;
#Local
public interface LRSManager extends ILRSManager {
}
I'm trying to access the getAllPersons() method via the Interface manager in a servlet as followss:
#WebServlet("/RetrieveAllPersons")
public class RetrieveAllPersons extends HttpServlet {
private static final long serialVersionUID = 1L;
//private ILRSManager manager = LRSManagerFactory.getInstance().getLRSManager();
#EJB
private LRSManager manager;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Log logger = LogFactory.getLog(this.getClass());
logger.debug("Entering servlet");
List<IPerson> allPersons = manager.getAllPersons();
request.setAttribute("allPersons", allPersons);
logger.debug("Retrieved from persons: "+allPersons);
RequestDispatcher rd = request.getRequestDispatcher("persons.jsp");
rd.forward(request, response);
}
}
However, i have no idea why i'm getting the following exception:
lug 07, 2015 2:12:40 PM org.apache.openejb.core.transaction.EjbTransactionUtil handleSystemException
SEVERE: EjbTransactionUtil.handleSystemException: null
java.lang.NullPointerException
at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:76)
at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:118)
at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1602)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:210)
at org.hibernate.jpa.internal.EntityManagerImpl.<init>(EntityManagerImpl.java:91)
at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:345)
at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:332)
at org.apache.openejb.assembler.classic.ReloadableEntityManagerFactory.createEntityManager(ReloadableEntityManagerFactory.java:160)
at org.apache.openejb.persistence.JtaEntityManagerRegistry.getEntityManager(JtaEntityManagerRegistry.java:119)
at org.apache.openejb.persistence.JtaEntityManager.getEntityManager(JtaEntityManager.java:96)
at org.apache.openejb.persistence.JtaEntityManager.proxyIfNoTx(JtaEntityManager.java:326)
at org.apache.openejb.persistence.JtaEntityManager.createNamedQuery(JtaEntityManager.java:289)
at edu.drg.ejb.LRSManagerBean.getAllPersons(LRSManagerBean.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:192)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:173)
at org.apache.openejb.monitoring.StatsInterceptor.record(StatsInterceptor.java:181)
at org.apache.openejb.monitoring.StatsInterceptor.invoke(StatsInterceptor.java:100)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:192)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:173)
at org.apache.openejb.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:85)
at org.apache.openejb.core.stateless.StatelessContainer._invoke(StatelessContainer.java:227)
at org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:194)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler.synchronizedBusinessMethod(EjbObjectProxyHandler.java:308)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:303)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:92)
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:308)
at com.sun.proxy.$Proxy76.getAllPersons(Unknown Source)
at edu.drg.servlet.RetrieveAllPersons.doPost(RetrieveAllPersons.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
lug 07, 2015 2:12:40 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [edu.drg.servlet.RetrieveAllPersons] in context with path [/TestingEJB] threw exception
javax.ejb.EJBException: The bean encountered a non-application exception; nested exception is:
java.lang.NullPointerException
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.convertException(BaseEjbProxyHandler.java:408)
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:312)
at com.sun.proxy.$Proxy76.getAllPersons(Unknown Source)
at edu.drg.servlet.RetrieveAllPersons.doPost(RetrieveAllPersons.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:44)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:76)
at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:118)
at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1602)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:210)
at org.hibernate.jpa.internal.EntityManagerImpl.<init>(EntityManagerImpl.java:91)
at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:345)
at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:332)
at org.apache.openejb.assembler.classic.ReloadableEntityManagerFactory.createEntityManager(ReloadableEntityManagerFactory.java:160)
at org.apache.openejb.persistence.JtaEntityManagerRegistry.getEntityManager(JtaEntityManagerRegistry.java:119)
at org.apache.openejb.persistence.JtaEntityManager.getEntityManager(JtaEntityManager.java:96)
at org.apache.openejb.persistence.JtaEntityManager.proxyIfNoTx(JtaEntityManager.java:326)
at org.apache.openejb.persistence.JtaEntityManager.createNamedQuery(JtaEntityManager.java:289)
at edu.drg.ejb.LRSManagerBean.getAllPersons(LRSManagerBean.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:192)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:173)
at org.apache.openejb.monitoring.StatsInterceptor.record(StatsInterceptor.java:181)
at org.apache.openejb.monitoring.StatsInterceptor.invoke(StatsInterceptor.java:100)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:192)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:173)
at org.apache.openejb.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:85)
at org.apache.openejb.core.stateless.StatelessContainer._invoke(StatelessContainer.java:227)
at org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:194)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler.synchronizedBusinessMethod(EjbObjectProxyHandler.java:308)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:303)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:92)
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:308)
... 25 more
It seems something is wrong with TransactionManager, i'm wondering if i still have to map my entities via hibernate.cfg.xml and add this mapping as the reference to persistence.xml. Also i have noticed what when i'm trying to access my method, the entitymanager removes all my records from the table.
I still didn't find anything that could help me on tomee documentation. Any ideas?

Answer 1

Found the solution, may be it could be usefull to someone.
As we are going to use Hibernate Persistence Provider and JTA, the transaction manager also should be the corresponding one, till now i was trying to use implicit, the open ejb transaction manager.
To solove this problem, we should use in persistence.xml, instead of
<property name="hibernate.transaction.manager_lookup_class"
value="org.apache.openejb.hibernate.TransactionManagerLookup"/>
this:
<property
name="transaction.factory_class" value="org.hibernate.transaction.JTATransactionFactory"/>
Also be aware of hibernate version you are using, i'm using 4.x, the provider
<provider>org.hibernate.ejb.HibernatePersistence</provider>
is deprecate, use this instead:
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>