javax.ejb.EJBException java.lang.IllegalStateException：无法为 unitName 检索 EntityManagerFactory答案

【问题标题】：javax.ejb.EJBException java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitNamejavax.ejb.EJBException java.lang.IllegalStateException：无法为 unitName 检索 EntityManagerFactory
【发布时间】：2015-02-27 02:22:43
【问题描述】：

我正在使用 EJB 开发 JavaEE 应用程序。

我有一个名为 Medico 的实体，其代码是：

@Entity
public class Medico implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 1L;

/**
 * 
 */

public Medico(String nome_medico, String morada_medico,
        String esp, GregorianCalendar dnasc_medico, int tel_medico) { //construtor parametrico
    super();
    this.nome_medico = nome_medico;
    this.morada_medico = morada_medico;
    this.esp = esp;
    this.dnasc_medico = dnasc_medico;
    this.tel_medico = tel_medico;
}


@Id
@GeneratedValue
private int cod_medico; //bi
private String nome_medico;
private String morada_medico;
private String esp;
@Temporal(TemporalType.DATE)
private GregorianCalendar dnasc_medico;
private int tel_medico;
private ArrayList<GregorianCalendar> agenda_consultas;
private ArrayList<GregorianCalendar> agenda_atos;
private int total_atos;
private int total_presc;



public int getTotal_presc() {
    return total_presc;
}

public void setTotal_presc(int total_presc) {
    this.total_presc = total_presc;
}

public Medico(){ //construtor vazio
    super();
}

public int getTotal_atos() {
    return total_atos;
}



public void setTotal_atos(int total_atos) {
    this.total_atos = total_atos;
}

public ArrayList<GregorianCalendar> getAgenda_consultas() {
    return agenda_consultas;
}

public void setAgenda_consultas(ArrayList<GregorianCalendar> agenda_consultas) {
    this.agenda_consultas = agenda_consultas;
}

public ArrayList<GregorianCalendar> getAgenda_atos() {
    return agenda_atos;
}

public void setAgenda_atos(ArrayList<GregorianCalendar> agenda_atos) {
    this.agenda_atos = agenda_atos;
}

public int getCod_medico() {
    return cod_medico;
}

public void setCod_medico(int cod_medico) {
    this.cod_medico = cod_medico;
}

public String getNome_medico() {
    return nome_medico;
}

public void setNome_medico(String nome_medico) {
    this.nome_medico = nome_medico;
}

public String getMorada_medico() {
    return morada_medico;
}

public void setMorada_medico(String morada_medico) {
    this.morada_medico = morada_medico;
}

public String getEsp() {
    return esp;
}

public void setEsp(String esp) {
    this.esp = esp;
}

public GregorianCalendar getDnasc_medico() {
    return dnasc_medico;
}

public void setDnasc_medico(GregorianCalendar dnasc_medico) {
    this.dnasc_medico = dnasc_medico;
}

public int getTel_medico() {
    return tel_medico;
}

public void setTel_medico(int tel_medico) {
    this.tel_medico = tel_medico;
}

@Override
public String toString() {
    return "Medico [cod_medico=" + cod_medico + ", nome_medico="
            + nome_medico + ", morada_medico=" + morada_medico + ", esp="
            + esp + ", dnasc_medico=" + dnasc_medico + ", tel_medico="
            + tel_medico + "]";
}
}

然后我创建了一个会话bean实现类：

@Stateless
public class HospitalManagement implements AdministradorSessionRemote,GestorSessionRemote {

/**
 * Default constructor. 
 */
@PersistenceContext(unitName="Hospital")
private EntityManager em;
public HospitalManagement() {
    // TODO Auto-generated constructor stub
}


@Override
public String cria_medico(String nome_medico, String morada_medico,
        String esp, GregorianCalendar dnasc_medico, int tel_medico) {
        Medico md = new Medico (nome_medico, morada_medico, esp, dnasc_medico,tel_medico);
    em.persist(md);
    return "Medico "+Integer.toString(md.getCod_medico())+" criado!"; 
}

这个类实现了两个接口，但是上面的方法只用在下面一个：

@Remote
public interface GestorSessionRemote {


public String cria_medico(String nome_medico,String morada_medico,String esp,GregorianCalendar dnasc_medico, int tel_medico);
public String procura_nome_medico(String nome);
public String procura_cod_medico(int cod);
public String altera_morada_med(int cod, String morada);
public String altera_telemovel_med(int cod, int tel);

然后我创建了一个客户端：

public class GestorClient {

public static void main(String[] args){

        InitialContext ctx =new InitialContext();
        GestorSessionRemote g=(GestorSessionRemote)ctx.lookup("java:global/HospitalEAR/Hospital/HospitalManagement!Sessions.GestorSessionRemote");
        System.out.println(g.cria_medico(nomem, moradam, esp,cal,telm));

其中方法的参数是通过键盘扫描获得的。

我还创建了以下 persistence.xml 文件：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence    http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
    <persistence-unit name="Hospital">
    <properties>
    <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
    </properties>
    </persistence-unit>
    </persistence>

当我尝试部署应用程序时，出现错误。这是完整的堆栈跟踪：

Exception in thread "main" javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748)
at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:698)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:503)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4566)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2074)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2044)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:212)
at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:79)
at com.sun.proxy.$Proxy236.cria_medico(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie.dispatchToMethod(ReflectiveTie.java:143)
at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:173)
at com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatchToServant(ServerRequestDispatcherImpl.java:528)
at com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatch(ServerRequestDispatcherImpl.java:199)
at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleRequestRequest(MessageMediatorImpl.java:1549)
at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleRequest(MessageMediatorImpl.java:1425)
at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleInput(MessageMediatorImpl.java:930)
at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:213)
at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleRequest(MessageMediatorImpl.java:694)
at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.dispatch(MessageMediatorImpl.java:496)
at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.doWork(MessageMediatorImpl.java:2222)
at com.sun.corba.ee.impl.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:497)
at com.sun.corba.ee.impl.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:540)
Caused by: java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName Hospital
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.init(EntityManagerWrapper.java:138)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.doTxRequiredCheck(EntityManagerWrapper.java:158)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.doTransactionScopedTxCheck(EntityManagerWrapper.java:151)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.persist(EntityManagerWrapper.java:281)
at Sessions.HospitalManagement.cria_medico(HospitalManagement.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4786)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:55)
at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4758)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4746)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:205)
... 19 more

有人可以帮助我了解发生这种情况的原因吗？

【问题讨论】：

标签： java-ee-6 glassfish-4

【解决方案1】：

明显的问题是您没有在persistence.xml 中指定jta-data-source 和transaction-type。

jta-data-source 是这样指定的：

  <persistence-unit name="Hospital">
    <jta-data-source>jdbc/sample</jta-data-source>
  </persistence-unit>

您必须在 Glassfish 实例中创建 JDBC 资源。为此，请打开 http://localhost:4848 下的 Glassfish 管理 GUI，并在 Resources -> JDBC Connection Pools 下创建一个连接池。然后在Resources->JDBC Resources下创建一个JDBC资源，命名为jdbc/sample，并使其引用新的连接池。

此外，服务器似乎以某种方式认为您想使用 transaction-type RESOURCE_LOCAL，这要求您指定 EntityManagerFactory 以获取 EntityManager 的实例。

JTA 应该是 Java EE 环境中的默认 transaction-type，但您可能必须在 persistence.xml 中显式指定 transaction-type，如下所示：

<persistence-unit name="Hospital" transaction-type="JTA">

另请参阅：

persistence.xml different transaction-type attributes

【讨论】：