用JBuilder6.0+WebLogic6.0開發EJB的一個問題?

[andyzhu98]

我用http://bdn.borland.com/article/images/28943/12289_3jbweblogic.pdf上的Working with entity beans的例子,在JBuilder6.0+WebLogic6.0環境上開發,make成功後在運行時提示如下錯誤;
C:\JBuilder6\jdk1.3.1\bin\javaw -classpath "D:\Zhunian\MyProject\TestEntity\TestEnt\classes;C:\bea\wlserver6.1\lib\weblogic_sp.jar;C:\bea\wlserver6.1\lib\weblogic.jar;C:\JBuilder6\lib\jdsserver.jar;C:\JBuilder6\lib\beandt.jar;C:\JBuilder6\lib\dx.jar;C:\JBuilder6\lib\jbuilder.jar;C:\JBuilder6\lib\help.jar;C:\JBuilder6\lib\gnuregexp.jar;C:\JBuilder6\jdk1.3.1\demo\jfc\Java2D\Java2Demo.jar;C:\JBuilder6\jdk1.3.1\jre\lib\i18n.jar;C:\JBuilder6\jdk1.3.1\jre\lib\jaws.jar;C:\JBuilder6\jdk1.3.1\jre\lib\rt.jar;C:\JBuilder6\jdk1.3.1\jre\lib\sunrsasign.jar;C:\JBuilder6\jdk1.3.1\lib\dt.jar;C:\JBuilder6\jdk1.3.1\lib\htmlconverter.jar;C:\JBuilder6\jdk1.3.1\lib\tools.jar" testent.EmpSesTestClient
-- Initializing bean access.
javax.naming.NameNotFoundException: Unable to resolve EmployeeSes. Resolved: '' Unresolved:'EmployeeSes' ; remaining name ''
at weblogic.rmi.internal.BasicOutboundRequest.sendReceive(BasicOutboundRequest.java:85)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:253)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:220)-- Failed initializing bean access.

at weblogic.rmi.internal.ProxyStub.invoke(ProxyStub.java:35)
at $Proxy0.lookup(Unknown Source)
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:323)
at javax.naming.InitialContext.lookup(InitialContext.java:350)
at testent.EmpSesTestClient.<init>(EmpSesTestClient.java:27)
at testent.EmpSesTestClient.main(EmpSesTestClient.java:155)
-- Calling create()
java.lang.NullPointerException
at testent.EmpSesTestClient.create(EmpSesTestClient.java:79)
at testent.EmpSesTestClient.main(EmpSesTestClient.java:157)
-- Failed: create()
-- Return value from create(): null.
Error in getEmpName(): Remote interface reference is null. It must be created by calling one of the Home interface methods first.
Employee Name from the Test Client is =

我又試著部署,提示如下錯誤;
C:\JBuilder6\jdk1.3.1\bin\javaw -classpath ";C:\bea\wlserver6.1\lib\weblogic_sp.jar;C:\bea\wlserver6.1\lib\weblogic.jar;" weblogic.deploy -component TestEntMod:myserver deploy 19781025 TestEntMod D:/Zhunian/MyProject/TestEntity/TestEnt/TestEntMod.jar
weblogic.j2ee.DeploymentException: Error deploying application TestEntMod:

Unable to deploy EJB: Employee from TestEntMod.jar:

The DataSource with the JNDI name: DemoDataSource could not be located. Please ensure that the DataSource has been deployed successfully and that the JNDI name in your EJB Deployment descriptor is correct.



at weblogic.deploy.deploy(deploy.java:665)
at weblogic.deploy.runBody(deploy.java:358)
at weblogic.utils.compiler.Tool.run(Tool.java:79)
at weblogic.deploy.main(deploy.java:1601)
Error deploying application TestEntMod:

Unable to deploy EJB: Employee from TestEntMod.jar:

The DataSource with the JNDI name: DemoDataSource could not be located. Please ensure that the DataSource has been deployed successfully and that the JNDI name in your EJB Deployment descriptor is correct.

不知是何故,請指教,謝謝.

[tuhongyu]

原代码呢？

[andyzhu98]

我用的是http://bdn.borland.com/article/images/28943/12289_3jbweblogic.pdf
中的Working with entity beans中的例子,主要的代碼如下:
Import a database schema部分
Driver: com.borland.datastore.jdbc.DataStoreDriver
URL: jdbc:borland:dsremote://localhost//C:\JBuilder6\samples\JDataStore\datastores\employee.jds
JNDI name: DemoDataSource.

接著根據EMPLOYEE表Create Entity Bean(Employee);

session bean部分(EmployeeSes)
Add a method to EmployeeSes and provide the following parameters.
Method name: getEmpName
Return type: String
Input parameters : Short empNo
Interfaces: remote
public String getEmpName(Short empNo) {
String empName = "name not found";
try {
javax.naming.Context context = new javax.naming.InitialContext();
Object object = context.lookup("java:comp/env/ejb/Employee");
EmployeeHome empHome = (EmployeeHome) javax.rmi.PortableRemoteObject.narrow(object,
EmployeeHome.class);
Employee emp = empHome.findByPrimaryKey(empNo);
empName = emp.getFirstName() + " " + emp.getLastName();
}catch (NamingException ex) {
ex.printStackTrace();
}catch (ClassCastException ex) {
ex.printStackTrace();
}catch (Exception ex){
ex.printStackTrace();
}
return empName;
}

然後就是Assign entity bean reference to session bean

test client部分(EmpSesTestClient)
public static void main(String[] args) {
EmployeeSesTestClient client = new EmployeeSesTestClient();
try {
client.create();
String empName = client.getEmpName(new Short("2"));
System.out.println("Employee Name from the Test Client is = " + empName);
}
catch (Exception ex) {
ex.printStackTrace();
}
}

開始的時候我沒有用連接池,添加後依然不能使用.
我換了數據庫oracle創建Entity bean依然顯示同樣的問題,請大家賜教.
萬分感謝.

[weilinwu]

DemoDataSource 这个东东没在Weblogic里配置吧？

建议你看看http://www.ccw.com.cn/htm/center/prog/02_5_23_4.asp

[chen_2001]

uo

[seaarmory]

我想可能是在bea下又一个目录叫WEB_INF有两个.xml文件一个是web.xml.还有一个我忘记了，在同一目录下面的。这里面改成你的开发路径就好了我以前也碰到这样的问题不能发布，直接修改就好了！

[yankk]

我也是这个问题
是在Object ref = ctx.lookup("yourEJBname");这个地方出的问题
我的ejb名字是Enterprise1
*******In the main function()********

Creating Enterprise1TestClient1

-- ************Initializing bean access.

-- *********8Begin to lookup jndi name

javax.naming.NameNotFoundException: Unable to resolve Enterprise1. Resolved: '' Unresolved:'Enterprise1' ; remaining name ''

at weblogic.rmi.internal.BasicOutboundRequest.sendReceive(BasicOutboundRequest.java:85)

at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:253)

at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:220)-- ***************Failed initializing bean access.
不知道怎么解决
等待！

to seaarmory(aaa):
我怎么找不到你说的文件和路径？
麻烦说的清楚一点，谢谢！

[worldheart]

你可以参考这篇文章。

http://www.csdn.net/develop/read_article.asp?id=15283

如果还是不行，可以找我。

MSN：[e-mail]

因为我最近很忙，不能细看您的问题。不好意思。

[cenjava]

我也出现楼主同样的问题，不知那一位热心朋友能够回答一下，seaarmory(aaa) 朋友能不能说的详细一点，究竟是哪个目录下的web.xml文件需要修改，我被这个问题困扰很长时间了，感谢了！

[jery_lee]

为什么没有人用WEBSPHERE?

[cenjava]

up

[cenjava]

seaarmory(aaa) 朋友请回话啊

[Carlson Wang]

哪有讲如何用JB在WEBSPHERE下配置EJB的文章啊？能贴出来吗？

[cenjava]

没用过，好用吗？有没有人能不能回答以上问题啊？