问题
I'm working on a JavaEE application with EJB.
I have an Entity called Medico which code is:
@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 + "]";
}
}
Then I created a session bean implementation class:
@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!";
}
This class implements two interfaces, but the method above is only used in the following one:
@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);
Then I created a client:
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));
where the parameters of the method are obtained by scannig from the keyboard.
I've also created the following persistence.xml file:
<?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>
When I try to deploy the application, an error occurs. Here is the complete stacktrace:
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
Could someone help me understand the reason why this is happening?
回答1:
The obvious problem is that you didn't specify a jta-data-source and the transaction-type in your persistence.xml.
A jta-data-source is specified like this:
<persistence-unit name="Hospital">
<jta-data-source>jdbc/sample</jta-data-source>
</persistence-unit>
You have to create the JDBC resource in your Glassfish instance. To do this open the Glassfish Admin GUI under http://localhost:4848 and create a Connection Pool under Resources -> JDBC Connection Pools. Then create a JDBC resource under Resources -> JDBC Resources named jdbc/sample and make it reference the new connection pool.
Further, it looks like the server somehow thinks that you want to use transaction-type RESOURCE_LOCAL which requires that you specify an EntityManagerFactory to get an instance of the EntityManager.
JTA should be the default transaction-type in a Java EE environment but you may have to explicitly specifiy the transaction-type in the persistence.xml like this:
<persistence-unit name="Hospital" transaction-type="JTA">
See also:
- persistence.xml different transaction-type attributes
来源：https://stackoverflow.com/questions/27713599/javax-ejb-ejbexception-java-lang-illegalstateexception-unable-to-retrieve-entit