我想用Hibernate JPA为EJB创建一个POC，同样遵循this article，我得到的连接异常如下所示。我尝试按照on this thread发布的解决方案，但仍然无法连接。
我创建了一个专用的hibernate POC，我能够连接，但不能从EJB - Hibernate组合。
22:27:42,258 INFO [org.hibernate.tool.hbm2ddl.SchemaExport] exporting generated schema to database
22:27:42,258 WARN [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] Throwable while attempting to get a new connection: null: org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (org.jboss.resource.JBossResourceException: Failed to register driver for: com.mysql.jdbc.Driver; - nested throwable: (java.lang.ClassNotFoundException: com.mysql.jdbc.Driver from BaseClassLoader@a1665c{vfs:///C:/Users/[myname]/workspace/.metadata/.plugins/org.jboss.ide.eclipse.as.core/JBoss_AS_6.x1481865411227/deploy/EmployeeManagementEJB.jar}))
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:261) [:6.1.0.Final]
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:215) [:6.1.0.Final]
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:648) [:6.1.0.Final]
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:272) [:6.1.0.Final]
at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection(JBossManagedConnectionPool.java:690) [:6.1.0.Final]
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection(BaseConnectionManager2.java:403) [:6.1.0.Final]
at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:414) [:6.1.0.Final]
at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:496) [:6.1.0.Final]
at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:941) [:6.1.0.Final]
at
//deleted few error lines due to space constrain
org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.getDriver(LocalManagedConnectionFactory.java:538) [:6.1.0.Final]
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:228) [:6.1.0.Final]
... 86 more
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver from BaseClassLoader@a1665c{vfs:///C:/Users/[myname]/workspace/.metadata/.plugins/org.jboss.ide.eclipse.as.core/JBoss_AS_6.x1481865411227/deploy/EmployeeManagementEJB.jar}
at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:480) [jboss-classloader.jar:2.2.1.GA]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) [:1.8.0_77]
at java.lang.Class.forName0(Native Method) [:1.8.0_77]
at java.lang.Class.forName(Class.java:348) [:1.8.0_77]
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.getDriver(LocalManagedConnectionFactory.java:523) [:6.1.0.Final]
... 87 more
22:27:42,262 INFO [org.hibernate.validator.engine.resolver.DefaultTraversableResolver] Instantiated an instance of org.hibernate.validator.engine.resolver.JPATraversableResolver.
22:27:42,270 INFO [org.hibernate.validator.engine.resolver.DefaultTraversableResolver] Instantiated an instance of org.hibernate.validator.engine.resolver.JPATraversableResolver.
22:27:42,272 INFO [org.hibernate.util.NamingHelper] JNDI InitialContext properties:{java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory, java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces}
22:27:42,285 INFO [org.jboss.ejb3.session.SessionSpecContainer] Starting jboss.j2ee:jar=EmployeeManagementEJB.jar,name=ManageEmployeeBean,service=EJB3
22:27:42,294 INFO [org.jboss.ejb3.EJBContainer] STARTED EJB: com.jwt.ejb.business.impl.ManageEmployeeBean ejbName: ManageEmployeeBean
22:27:42,297 INFO [org.jboss.ejb3.proxy.impl.jndiregistrar.JndiSessionRegistrarBase] Binding the following Entries in Global JNDI:
ManageEmployeeBean/remote - EJB3.x Default Remote Business Interface
ManageEmployeeBean/remote-com.jwt.ejb.business.impl.ManageEmployeeBeanRemote - EJB3.x Remote Business Interface
以下是我的数据来源
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE datasources
PUBLIC "-//JBoss//DTD JBOSS JCA Config 1.5//EN"
"http://www.jboss.org/j2ee/dtd/jboss-ds_1_5.dtd">
<datasources>
<local-tx-datasource>
<jndi-name>EmpMngEJBDatasource</jndi-name>
<use-java-context>true</use-java-context>
<connection-url>jdbc:mysql://localhost:3306/new_schema</connection-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<user-name>root</user-name>
<password>admin</password>
</local-tx-datasource>
</datasources>
以下是我的设置
<?xml version="1.0" encoding="UTF-8"?>
<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="EmpMgmtPU" transaction-type="JTA">
<jta-data-source>java:/EmpMngEJBDatasource</jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
</properties>
</persistence-unit>
</persistence>
以下是我的实体
package com.jwt.ejb.entity;
import java.io.Serializable;
import javax.persistence.*;
@Entity(name="employee")
public class Employee implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@Column(name = "id")
private Integer id;
@Column(name = "first_name", length = 50)
private String firstName;
@Column(name = "last_name", length = 50)
private String lastName;
@Column(name = "email", length = 50)
private String email;
//setter getter - trimed due to space constrain
}
以下是托管bean
package com.jwt.ejb.business.impl;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.*;
import com.jwt.ejb.entity.Employee;
@Stateless
public class ManageEmployeeBean implements ManageEmployeeBeanRemote {
@PersistenceContext(unitName = "EmpMgmtPU")
private EntityManager entityManager;
@Override
public boolean addEmployee(Employee employee) {
entityManager.persist(employee);
return true;
}
@Override
public List<Employee> getEmployees() {
return entityManager.createQuery("SELECT e FROM employee e").getResultList();
}
}
以下是我的客户代码
package com.jwt.ejb.client;
import java.util.List;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import com.jwt.ejb.business.impl.ManageEmployeeBeanRemote;
import com.jwt.ejb.entity.Employee;
public class Client {
public static void main(String[] args) {
ManageEmployeeBeanRemote remote = doLookup();
List<Employee> employees = remote.getEmployees();
for(Employee emp : employees){
System.out.println("---");
System.out.println("getFirstName : "+emp.getFirstName());
System.out.println("getLastName : "+emp.getLastName());
System.out.println("getEmail : "+emp.getEmail());
System.out.println("getId : "+emp.getId());
}
}
private static ManageEmployeeBeanRemote doLookup() {
Context context = null;
ManageEmployeeBeanRemote bean = null;
try {
context = getInitialContext();
bean = (ManageEmployeeBeanRemote) context.lookup(LOOKUP_STRING);
} catch (NamingException e) {
e.printStackTrace();
}
return bean;
}
private static final String LOOKUP_STRING = "ManageEmployeeBean/remote";
private static final String PROVIDER_URL = "jnp://localhost:1099";
private static final String JNP_INTERFACES = "org.jboss.naming:org.jnp.interfaces";
private static final String INITIAL_CONTEXT_FACTORY = "org.jnp.interfaces.NamingContextFactory";
private static Context initialContext;
public static Context getInitialContext() throws NamingException {
if (initialContext == null) {
// Properties extends HashTable
Properties prop = new Properties();
prop.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_FACTORY);
prop.put(Context.URL_PKG_PREFIXES, JNP_INTERFACES);
prop.put(Context.PROVIDER_URL, PROVIDER_URL);
initialContext = new InitialContext(prop);
}
return initialContext;
}
}
答案 0 :(得分：1)
驱动程序类必须在类路径上可用。最简单的方法是将.jar库放在部署目录中。
对于EAP 6，它是： JBOSS_HOME /独立/部署/