EJB下remote not bound 错误
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2024-02-22 21:56:00
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EJB报错如下:
javax.naming.NameNotFoundException: remote not bound
at org.jnp.server.NamingServer.getBinding(NamingServer.java:529)
at org.jnp.server.NamingServer.getBinding(NamingServer.java:537)
at org.jnp.server.NamingServer.getObject(NamingServer.java:543)
at org.jnp.server.NamingServer.lookup(NamingServer.java:296)
at org.jnp.server.NamingServer.lookup(NamingServer.java:270)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)
at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:667)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:627)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at junit.test.PersionServiceTest.setUpBeforeClass(PersionServiceTest.java:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.internal.runners.BeforeAndAfterRunner.invokeMethod(BeforeAndAfterRunner.java:74)
at org.junit.internal.runners.BeforeAndAfterRunner.runBefores(BeforeAndAfterRunner.java:50)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:33)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
当然就算是初学者也知道,绑定不上远程!可到底是哪里绑定不上呢?可以一步步的测试!
先看三个文件:
远程接口文件:
package service.impl;
import java.util.List;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import service.PersionService;
import bean.Persion;
@Stateless
@Remote(PersionService.class)
public class PersoinServiceBean implements PersionService {
@PersistenceContext(unitName = "golden")
EntityManager en;
public void delete(Integer persionid) {
en.remove(en.getReference(Persion.class, persionid));
}
public Persion getPersion(Integer persionid) {
return en.find(Persion.class, persionid);
}
@SuppressWarnings("unchecked")
public List<Persion> getPersions() {
return en.createQuery("select * from Persion p").getResultList();
}
public void save(Persion persion) {
en.persist(persion);
}
public void update(Persion persion) {
en.merge(persion);
}
}
连接池配置文件:persistence.xml(在项目SRC下的META-INF下)
<?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_1_0.xsd"
version="1.0">
<persistence-unit name="golden" transaction-type="JTA">
<jta-data-source>java:goldenDS</jta-data-source>
</persistence-unit>
</persistence>
Jboss连接数据库配置文件,这里是用的是Mysql
<?xml version="1.0" encoding="UTF-8"?>
<datasources>
<local-tx-datasource>
<jndi-name>goldenDS</jndi-name>
<connection-url>
jdbc:mysql://localhost:3306/golden?useUnicode=true&characterEncoding=utf-8
</connection-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<user-name>root</user-name>
<password>root</password>
<exception-sorter-class-name>
org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter
</exception-sorter-class-name>
<metadata>
<type-mapping>mySQL</type-mapping>
</metadata>
</local-tx-datasource>
</datasources>
1.先看服务器是否连接上了数据库,启动服务器 连接到主页从 JMX Console 可以看到相应链接池的情况
2.看远程接口是否正确,去除管理对象
@PersistenceContext(unitName = "golden") EntityManager en;
这时通过测试看是否能得到远程的对象
如果远程无法绑定或相应的远程接口无法绑定,则一个可能是由于接口本身创建时错误,还有可能是接口实现类内部调用的对象出错!
本次错误就是因为调用的管理对象无法创建造成的!
首选是服务器配置文件的错误,连接字符串不正确,再者,persistence.xml一定要在META-INF下切这个文件名称全是小写!
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