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william shen

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Recent posts by william shen

hi,

i installed oracle 9.2.0.4 on linux 9.0, and i created a database called 'test'. but somehow i deleted all the related control and data files of 'test'. when i tried the "startup" command i got the following error message
"ORA-01079: ORACLE database was not properly created, operation aborted".


then i tried to regenerated 'test' but was told

"ORA-01501: CREATE DATABASE failed
ORA-01100: database already mounted"

what should i do? looking forward to reply!
17 years ago
i think the ejbobject is the new name for the stub and skeleton object. IMHO from what i have done it should be the bean instance. correct me if i am wrong.
Hello, Chris are you there?

is my question too stupid? is the way i test the program wrong?
somebody please help.
1) i am using Jboss

2)i put an instance variable i to the bean class,and put a counter in the findbyprimekey method.

class samplebean implements entitybean{
private int i;

... ejbfindbyprimekey(){
i++;
System.out.println("i");

}
}
i call the findbyprimekey from client, and everytime the console output i as 1. so i guess everytime a new bean instance was created. am i right?

"3) Are you aware of the difference between a bean instance and an EJBObject instance and how they are associated? "

i do not know the answer for this question. maybe this is the problem?
Thanks Chris for your explanation.
i did not read the spec yet.

i run the example again, it seems fell into non of the options.
1. the ejbload is called only for findbyprimekey with different keys.

for example:
when i call findbyprimekey(1)the first time, it will call ejbload
if i run it for a second time, ejbload was not called, while at the same time a new instance was created.

if i call findbyprimekey with a different key findbyprimekey(2), ejbload was called and a new instance was created.

so it seems everytime it created new instance but ejbload was not always called. how to explain it

Originally posted by Srinivas:
Entity beans stay until they are deleted.Check ur program whether u hv written any where to delete the bean.

Generally when the program terminates,object is lost but entity bean stays until it is deleted.



Srinivas,

Thanks for your reply. i think that is not my question. my question is why the container generates new instance everytime i call the findByPrimekey method even i call it with exactly the same key. according to you reuse the existing instance(since it is not gone yet) for the same primekey would make more sense than create a new one. i think Kyle answer it. but i am still confused what is the benefit of doing this, what is the context that will fit into this policy. Since RJB spec put this as an option, it should have its use. Kyle can you explain it?
hello,

i am new to the EJB world, i created a sample entity bean which is accessed through a stateless session bean. it seems like everytime i called the findByPrimaryKey method on the entity bean, it created a new instance of the bean even i called findByPrimaryKey with exactly the same key. is it normal, or i did something wrong. coz, why does the container create new instance of the bean everytime instead of reusing the same instance to save memory? can somebody clear this out for me? thanks in advance.
hello,

i am new to the EJB world, i created a sample entity bean which is accessed through a stateless session bean. it seems like everytime i called the findByPrimaryKey method on the entity bean, it created a new instance of the bean even i called findByPrimaryKey with exactly the same key. is it normal, or i did something wrong. coz, why does the container create new instance of the bean everytime instead of reusing the same instance to save memory? can somebody clear this out for me? thanks in advance.

Originally posted by Cliff Liang:
Exception is thrown?
More details may be helpful !



Hello Cliff,
Thank you for your reply.There is no exception thrown. it is not i created a test client already and the client can not find the ejb located in the jboss server. The problem is that the lomboz new test client wizard can not find the deployed beans in the Jboss server, such as when the wizard dialog window pop up, i specifies the server and it try to search for the matching interfaces as the home and remote interfaces, it always give me nothing but empty list.

while i did get some exceptions when i run the jboss as debug mode. i pasted it below, see if it can help:

"rg.jboss.deployment.DeploymentException: create operation failed for package file:/D:/jboss/jboss-3.2.3/server/all/deploy/jboss-net.sar/; - nested throwable: (org.jboss.deployment.DeploymentException: - nested throwable: (java.lang.reflect.UndeclaredThrowableException))
at org.jboss.deployment.SARDeployer.create(SARDeployer.java:202)
at org.jboss.deployment.MainDeployer.create(MainDeployer.java:786)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:641)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:605)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy6.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:302)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:476)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:201)
at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:274)
at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:976)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:394)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:226)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:832)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:642)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:605)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:589)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy5.deploy(Unknown Source)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:384)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:291)
at org.jboss.Main.boot(Main.java:150)
at org.jboss.Main$1.run(Main.java:395)
at java.lang.Thread.run(Unknown Source)
Caused by: org.jboss.deployment.DeploymentException: - nested throwable: (java.lang.reflect.UndeclaredThrowableException)
at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:139)
at org.jboss.system.ServiceController.install(ServiceController.java:225)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.install(Unknown Source)
at org.jboss.deployment.SARDeployer.create(SARDeployer.java:183)
... 49 more
Caused by: java.lang.reflect.UndeclaredThrowableException
at org.jboss.system.ServiceCreator.install(ServiceCreator.java:181)
at org.jboss.system.ServiceConfigurator.internalInstall(ServiceConfigurator.java:151)
at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:114)
... 59 more
Caused by: java.lang.NoClassDefFoundError: org/jboss/net/axis/Deployment
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getConstructor(Unknown Source)
at org.jboss.mx.server.MBeanServerImpl.instantiate(MBeanServerImpl.java:846)
at org.jboss.mx.server.MBeanServerImpl.instantiate(MBeanServerImpl.java:291)
at org.jboss.mx.server.MBeanServerImpl.createMBean(MBeanServerImpl.java:318)
at org.jboss.system.ServiceCreator.install(ServiceCreator.java:98)
... 61 more
java.lang.NoClassDefFoundError: org/jgroups/JChannel
at org.jboss.ha.framework.server.ClusterPartition.createService(ClusterPartition.java:231)
at org.jboss.system.ServiceMBeanSupport.create(ServiceMBeanSupport.java:158)
at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:976)
at $Proxy14.create(Unknown Source)
at org.jboss.system.ServiceController.create(ServiceController.java:310)
at org.jboss.system.ServiceController.create(ServiceController.java:243)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.create(Unknown Source)
at org.jboss.deployment.SARDeployer.create(SARDeployer.java:192)
at org.jboss.deployment.MainDeployer.create(MainDeployer.java:786)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:641)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:605)
at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy6.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:302)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:476)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:201)
at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:274)
at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:976)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:394)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:226)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:832)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:642)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:605)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:589)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy5.deploy(Unknown Source)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:384)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:291)
at org.jboss.Main.boot(Main.java:150)
at org.jboss.Main$1.run(Main.java:395)
at java.lang.Thread.run(Unknown Source)
08:07:43,203 INFO [JRMPInvokerHA] Started jboss:service=invoker,type=jrmpha
08:07:43,218 INFO [MainDeployer] Deployed package: file:/D:/jboss/jboss-3.2.3/server/all/deploy/cluster-service.xml
08:07:43,281 INFO [MainDeployer] Starting deployment of package: file:/D:/jboss/jboss-3.2.3/server/all/deploy/iiop-service.xml
08:07:43,484 INFO [CorbaORBService] Using OAIAddr=null
08:07:44,250 WARN [ServiceController] Problem creating service jboss:service=CorbaORB
java.lang.IllegalAccessError: tried to access method org.jboss.iiop.CorbaORB.setInstance(Lorg/omg/CORBA/ORB V from class org.jboss.iiop.CorbaORBService
at org.jboss.iiop.CorbaORBService.createService(CorbaORBService.java:113)
at org.jboss.system.ServiceMBeanSupport.create(ServiceMBeanSupport.java:158)
at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:976)
at $Proxy14.create(Unknown Source)
at org.jboss.system.ServiceController.create(ServiceController.java:310)
at org.jboss.system.ServiceController.create(ServiceController.java:243)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.create(Unknown Source)
at org.jboss.deployment.SARDeployer.create(SARDeployer.java:192)
at org.jboss.deployment.MainDeployer.create(MainDeployer.java:786)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:641)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:605)
at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy6.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:302)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:476)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:201)
at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:274)
at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:976)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:394)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy4.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:226)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:832)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:642)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:605)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:589)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy5.deploy(Unknown Source)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:384)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:291)
at org.jboss.Main.boot(Main.java:150)
at org.jboss.Main$1.run(Main.java:395)
at java.lang.Thread.run(Unknown Source)"
18 years ago
i am creating a J2EE test client using lomboz 2.1.3 for a ejb deployed in Jboss 3.2.3 in Eclipse 2.1.2. the bean was deployed successfully but when i am trying to create a test client, the create test client wizard can not find the deployed beans in the Jboss server. what's the problem? i am following the tutorial from http://www.tusc.com.au/tutorial/html/chap1.html. Pls help me out.
[ May 31, 2004: Message edited by: william shen ]
18 years ago
I took the exam today. When i ended the exam, it showed that "you do not agree the Non_closure agreement of Sun and there will be no result for this exam". And i can not check my sectionscore either. However it can print my score and it showed that i pass the exam with 83%. How come?
Did it mean that Sun will not consider the result of my exam? Anybody can clear this for me?
I think you can call it multi-times, but only the first call will be effective. You might use the outputstream in your case.