初学ejb，这个小问题折磨我2天了。问题解决，马上揭帖

[rising201]

我想用ejb写个了打印出hello，world字符串的小例子，但往weblogic上部署总不成功，不知写法哪儿错了。望大家给指条路。另注：部署一个同事的ejb是可以的，说明weblogic没问题。
src/examples目录下的文件
1.Hello
package examples;

import javax.ejb.EJBObject;

public interface Hello extends EJBObject {
public String hello() throws java.rmi.RemoteException;
}
----------------------------------
2.HelloBean
package examples;

import javax.ejb.EJBException;
import javax.ejb.SessionContext;

public class HelloBean implements javax.ejb.SessionBean {
private SessionContext ctx;

public void ejbCreate() {
System.out.println("ejbCreate");
}

public void setSessionContext(SessionContext sessionContext) throws EJBException {
ctx = sessionContext;
}

public void ejbRemove() throws EJBException {
System.out.println("ejbRemove");
}

public void ejbActivate() throws EJBException {
System.out.println("ejbActivate");
}

public void ejbPassivate() throws EJBException {
System.out.println("ejbPassivate");
}

public String hello() {
System.out.println("hello,world");
return "Hello,world";
}
}
----------------------------------
3.HelloHome
package examples;

public interface HelloHome extends javax.ejb.EJBHome{
Hello create() throws java.rmi.RemoteException,javax.ejb.CreateException;
}
**********************************
META-INF目录
1.ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<enterprise-beans>
<session>
<ejb-name>Hello</ejb-name>
<home>examples.HelloHome</home>
<remote>examples.Hello</remote>
<ejb-class>examples.HelloBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>
2.weblogic-ejb-jar.xml
<?xml version="1.0"?>

<!DOCTYPE weblogic-ejb-jar PUBLIC "-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB//EN" "http://www.bea.com/servers/wls700/dtd/weblogic-ejb-jar.dtd" >


<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>Hello</ejb-name>
<jndi-name>Hello</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
**********************************
然后，我用jar cvf Hello.jar *.*打包，放到weblogic的对应目录下，部署出现如下异常
Exception:weblogic.management.ApplicationException: prepare failed for Hello Module: Hello Error: Exception preparing module: EJBModule(Hello,status=NEW) Unable to deploy EJB: C:\bea\user_projects\domains\mydomain\applications\Hello.jar from Hello.jar: weblogic.ejb20.deployer.DeploymentDescriptorException: Unable to load a class specified in your ejb-jar.xml: examples.HelloBean at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(Lweblogic.management.descriptors.toplevel.EJBDescriptorMBean;Lweblogic.utils.classloaders.GenericClassLoader;)V(MBeanDeploymentInfoImpl.java:550) at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.<init>(Lweblogic.management.descriptors.toplevel.EJBDescriptorMBean;Lweblogic.utils.classloaders.GenericClassLoader;Ljava.lang.String;Ljava.lang.String;Ljava.lang.String;Lweblogic.utils.jars.VirtualJarFile;)V(MBeanDeploymentInfoImpl.java:232) at weblogic.ejb20.deployer.EJBDeployer.prepare(Lweblogic.utils.jars.VirtualJarFile;Ljava.lang.ClassLoader;Lweblogic.management.descriptors.toplevel.EJBDescriptorMBean;Ljavax.naming.Context;Ljava.util.Map;)V(EJBDeployer.java:1302) at weblogic.ejb20.deployer.EJBModule.prepare(Ljava.lang.ClassLoader;)V(EJBModule.java:498) at weblogic.j2ee.J2EEApplicationContainer.prepareModule(Lweblogic.utils.classloaders.GenericClassLoader;Lweblogic.j2ee.J2EEApplicationContainer$Component;Z)V(J2EEApplicationContainer.java:3101) at weblogic.j2ee.J2EEApplicationContainer.prepareModules([Lweblogic.j2ee.J2EEApplicationContainer$Component;Ljava.lang.String;Z)V(J2EEApplicationContainer.java:1560) at weblogic.j2ee.J2EEApplicationContainer.prepare([Lweblogic.j2ee.J2EEApplicationContainer$Component;[Ljava.lang.String;Ljava.lang.String;Ljava.lang.String;)V(J2EEApplicationContainer.java:1208) at weblogic.j2ee.J2EEApplicationContainer.prepare(Ljava.lang.String;[Lweblogic.management.configuration.ComponentMBean;[Ljava.lang.String;)V(J2EEApplicationContainer.java:1051) at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareContainer()V(SlaveDeployer.java:2444) at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer()Z(SlaveDeployer.java:2394) at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare()V(SlaveDeployer.java:2310) at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(Lweblogic.management.deploy.OamVersion;Lweblogic.management.runtime.DeploymentTaskRuntimeMBean;Z)V(SlaveDeployer.java:866) at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(Lweblogic.management.deploy.OamDelta;Lweblogic.management.deploy.OamVersion;ZLjava.lang.StringBuffer;)Z(SlaveDeployer.java:594) at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(Ljava.util.ArrayList;Z)V(SlaveDeployer.java:508) at weblogic.drs.internal.SlaveCallbackHandler$1.execute(Lweblogic.kernel.ExecuteThread;)V(SlaveCallbackHandler.java:25) at weblogic.kernel.ExecuteThread.execute(Lweblogic.kernel.ExecuteRequest;)V(ExecuteThread.java:219) at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:178) at java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Unknown Source)

望有识之士一定要帮我，不然睡不好觉。

[crazycy]

从这句weblogic.ejb20.deployer.DeploymentDescriptorException: Unable to load a class specified in your ejb-jar.xml: examples.HelloBean；可以推测可能jar cvf Hello.jar *.*这个地方出了问题，比如打包后的类缺少包等；其次public void ejbCreate() 最好增加throws CreateException这个异常

[crazycy]

我完全按这个例子做了一次 没有问题的 打包后的jar包目录应该是：
examples （应该是这个地方出的问题）
.
.......若干.class文件
META-INF
.
......ejb-jar.xml
weblogic-ejb-jar.xml
还可以有些工具生成的

[rising201]

真是怪了。我的就是不行。
我的文件结构：
classes/examples/
- Hello.class
- HelloBean.class
- HelloHome.class
META-INF/
- ejb-jar.xml
- weblogic-ejb-jar.xml
src/examples/
- Hello.java
- HelloBean.java
- HelloHome.java
然后我打包为jar，jar的目录结构也是这样的，可就是不行，weblogic还保上面的异常。苦恼ing

crazycy(代言人)，我的msn是：[e-mail]，你的msn是多少，能否交流一下。

[rising201]

另外想问一下，我用idea开发的，文件结构是：
classes/examples/
- Hello.class
- HelloBean.class
- HelloHome.class
META-INF/
- ejb-jar.xml
- weblogic-ejb-jar.xml
src/examples/
- Hello.java
- HelloBean.java
- HelloHome.java
这样的，怎么打包才能打成
examples/
- Hello.class
- HelloBean.class
- HelloHome.class
META-INF/
- ejb-jar.xml
- weblogic-ejb-jar.xml
格式的呢？谢谢