使用 Hibernate Persistence Provider 和 MySQL 数据库在 Apache TomEE 中部署 EJB
EJB deployment in Apache TomEE using Hibernate Persistence Provider and MySQL DB
我在配置基于 EJB 3.0 技术的项目时遇到问题。作为服务器容器，我使用 Apache TomEE v.7.0（内置 OpenEJB 模块）、MySQL 数据库和休眠作为持久性提供程序。
下面是我的配置文件：
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>
人实体（其他实体类似）
@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;
}
本地接口：
import javax.ejb.Local;
import edu.drg.interfaces.ILRSManager;
@Local
public interface LRSManager extends ILRSManager {
}
我正在尝试通过 servlet 中的接口管理器访问 getAllPersons() 方法，如下所示：
@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);
}
}
但是，我不知道为什么会出现以下异常：
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
TransactionManager 似乎有问题，我想知道我是否仍然需要通过 hibernate.cfg.xml 映射我的实体并将此映射添加为对 persistence.xml 的引用。我还注意到，当我尝试访问我的方法时，entitymanager 从 table 中删除了我的所有记录。
我仍然没有找到任何可以帮助我处理 tomee 文档的东西。有什么想法吗？
找到解决方案，可能对某人有用。
由于我们要使用 Hibernate Persistence Provider 和 JTA，因此事务管理器也应该是相应的，直到现在我一直在尝试使用 implicit，open ejb 事务管理器。
为了解决这个问题，我们应该使用persistence.xml，而不是
<property name="hibernate.transaction.manager_lookup_class"
value="org.apache.openejb.hibernate.TransactionManagerLookup"/>
这个：
<property
name="transaction.factory_class" value="org.hibernate.transaction.JTATransactionFactory"/>
还要注意您正在使用的休眠版本，我正在使用 4.x，提供程序
<provider>org.hibernate.ejb.HibernatePersistence</provider>
已弃用，请改用：
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
我在配置基于 EJB 3.0 技术的项目时遇到问题。作为服务器容器，我使用 Apache TomEE v.7.0（内置 OpenEJB 模块）、MySQL 数据库和休眠作为持久性提供程序。
下面是我的配置文件：
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>
人实体（其他实体类似）
@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;
}
本地接口：
import javax.ejb.Local;
import edu.drg.interfaces.ILRSManager;
@Local
public interface LRSManager extends ILRSManager {
}
我正在尝试通过 servlet 中的接口管理器访问 getAllPersons() 方法，如下所示：
@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);
}
}
但是，我不知道为什么会出现以下异常：
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
TransactionManager 似乎有问题，我想知道我是否仍然需要通过 hibernate.cfg.xml 映射我的实体并将此映射添加为对 persistence.xml 的引用。我还注意到，当我尝试访问我的方法时，entitymanager 从 table 中删除了我的所有记录。 我仍然没有找到任何可以帮助我处理 tomee 文档的东西。有什么想法吗？
找到解决方案，可能对某人有用。
由于我们要使用 Hibernate Persistence Provider 和 JTA，因此事务管理器也应该是相应的，直到现在我一直在尝试使用 implicit，open ejb 事务管理器。
为了解决这个问题，我们应该使用persistence.xml，而不是
<property name="hibernate.transaction.manager_lookup_class"
value="org.apache.openejb.hibernate.TransactionManagerLookup"/>
这个：
<property
name="transaction.factory_class" value="org.hibernate.transaction.JTATransactionFactory"/>
还要注意您正在使用的休眠版本，我正在使用 4.x，提供程序
<provider>org.hibernate.ejb.HibernatePersistence</provider>
已弃用，请改用：
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>