Trouble looking up EJB from a JSP in another server
I'm using the Sun Reference Implementation of J2EE. I'm deploying a session EJB in one J2EE app on one machine, and accessing it from a JSP in another J2EE app on another machine. My lookup code that is called from the JSP first sets the properties of the InitialContext as follows:
Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.cosnaming.CNCtxFactory");
env.put(Context.PROVIDER_URL, "iiop://afowlertest:1050");
Context initial = new InitialContext(env);When I run both apps in the same server using this code, they work fine. However, when I run them in separate servers, the code throws the following exception (even if the JSP and EJB are deployed in the same server):
javax.naming.NameNotFoundException. Root exception is org.omg.CosNaming.NamingContextPackage.NotFound:
IDL:omg.org/CosNaming/NamingContext/NotFound:1.0
at org.omg.CosNaming.NamingContextPackage.NotFoundHelper.read(NotFoundHelper.java:72)
at org.omg.CosNaming._NamingContextExtStub.resolve(_NamingContextExtStub.java:406)
at com.sun.jndi.cosnaming.CNCtx.callResolve(CNCtx.java:440)
at com.sun.jndi.cosnaming.CNCtx.lookup(CNCtx.java:492)
at com.sun.jndi.cosnaming.CNCtx.lookup(CNCtx.java:470)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at com.sun.enterprise.naming.NamingManagerImpl.lookup(NamingManagerImpl.java:599)
at com.sun.enterprise.naming.java.javaURLContext.lookup(javaURLContext.java:90)
at microminer.client.SearchHandler.search(SearchHandler.java:127)
at org.apache.jsp.test$jsp._jspService(test$jsp.java:79)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
. . .(My class is the microminer.client.SearchHandler in the stack above.)
I've searched the forum for answers, but have not hit on anything yet. Any ideas? Thanks in advance!
Abraham Fowler
I'm going to answer my own question, because I kept searching the forums and eventually found the answer... maybe someone else in the same situation will find this answer here too. I got the answer from the following thread:
http://forum.java.sun.com/thread.jsp?forum=13&thread=256151
Basically, if you are doing a JNDI lookup with "java:comp/env" prefixed to the JNDI name, the app server will try to do a lookup within the current machine. If you leave that prefix off, it will look up using whatever properties you set in the InitialContext. At least, this is how I understood it from the thread I mentioned above.
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Looking up EJBs from a java client
While trying to migrate my application from standalone-oc4j
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Please help a confused and frustrated user.Looking at your example, it looks like you are using a J2EE client container or some properties file to specify the JNDI environment used to create the initial context (for you use the no-arg constructor to InitialContext). Since our application needs to the ability to dynamically connect to ejb's running on different Java application servers (e.g., WebLogic, WebSphere, JBoss), such an approach will not work. Instead we must do it the old-fashioned way and pass the jdni connection info to the InitialContext constructor.
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D:\SRC\jbproject\TestEntity>java weblogic.servlet.ejb2jsp.gui.Main
error occurred: java.lang.NullPointerException
java.lang.NullPointerException
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:287)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at weblogic.servlet.ejb2jsp.Utils.createBeanDescriptor(Utils.java:343)
at weblogic.servlet.ejb2jsp.Utils.createDefaultDescriptor(Utils.java:314
at weblogic.servlet.ejb2jsp.Utils.createDefaultDescriptor(Utils.java:266
at weblogic.servlet.ejb2jsp.gui.Main.loadFromPaths(Main.java:391)
at weblogic.servlet.ejb2jsp.gui.Main.doNew(Main.java:378)
at weblogic.servlet.ejb2jsp.gui.Main$5.run(Main.java:575)
at weblogic.servlet.ejb2jsp.gui.MainWorker.run(Main.java:757)
at java.lang.Thread.run(Thread.java:479)
error occurred: java.lang.NullPointerException
java.lang.NullPointerException
at weblogic.servlet.ejb2jsp.gui.Main.doNew(Main.java:379)
at weblogic.servlet.ejb2jsp.gui.Main$5.run(Main.java:575)
at weblogic.servlet.ejb2jsp.gui.MainWorker.run(Main.java:757)
at java.lang.Thread.run(Thread.java:479)
"Xiang Rao" <[email protected]> wrote:
>
>EJB and Java Bean are two different things. I don't think you can use
>useBean tag
>for EJB. On the other hand, you can write a Java Bean to wrap your EJB
>and use
>useBean tag.
>
>"Marek Kossak" <[email protected]> wrote:
>>
>>A scenario from some one new to web server, server application development.
>>
>>I have downloaded and installed an evaluation copy of WebLogic 7.x and
>>successfully
>>installed it (W2K version). The product starts up without error and
>>I can connect
>>to is successfully. I have created a simple java bean (actually an
>EJB)
>>and have
>>been able to deploy it successfully without any errors.
>>
>>I have a simple JSP invoked from a simple HTML page that contains a
>simple
>>form.
>> The JSP is attempting to instaniate the bean via the jsp:useBean tag
>>however,
>>all I am able to get back is an error that tells me that my class "could
>>not be
>>loaded". Here is the stack trace:
>>
>>weblogic.servlet.jsp.JspException: (line 3): class 'USDataworks.MICRworks.MICRworksBean'
>>could not be loaded
>> at weblogic.servlet.jsp.JspLexer.jspException(JspLexer.java:710)
>> at weblogic.servlet.jsp.JspLexer.processBeanTag(JspLexer.java:1372)
>> at weblogic.servlet.jsp.JspLexer.mXML_OPEN_USEBEAN(JspLexer.java:3612)
>> at weblogic.servlet.jsp.JspLexer.mXML_THING(JspLexer.java:1924)
>> at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1817)
>> at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1745)
>> at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:959)
>> at weblogic.servlet.jsp.JspParser.doit(JspParser.java:90)
>> at weblogic.servlet.jsp.JspParser.parse(JspParser.java:213)
>> at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:119)
>> at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:258)
>> at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:353)
>> at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:211)
>> at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:164)
>> at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:517)
>> at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:351)
>> at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:306)
>> at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:5445)
>> at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:780)
>> at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3105)
>> at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2588)
>> at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)
>> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)
>>
>>If I leave out the jsp:useBean tag I am able to return a simple HTML
>>page based
>>on information sent to the server, so I know some of the environment
>>is properly
>>set up.
>>
>>I have browsed through some of the WebLogic site and have been referred
>>to any
>>number of configuration files (*.properties) which do not appear to
>exist.
>> I
>>am frustrated and confused and would appreciate any help in getting
>this
>>to work.
>>
>>Thank you.
>
-
Invalid guid error looking up EJB from a startup class
Gentlemen,
I am receiving an "invalid guid at GDS" error that is similar to others reported at:
http://softwareforum.sun.com/servlet/ProcessRequest?RHIVEID=181&RPAGEID=135&HOID=50B500000008000000FE090000&UCATEGORY_0=_29_%24_24_6_&UCATEGORY_S=0
and
http://softwareforum.sun.com/servlet/ProcessRequest?RHIVEID=181&RPAGEID=135&HOID=50B500000008000000FE090000&UCATEGORY_0=_29_%24_24_6_&UCATEGORY_S=0
In my case, I can retrieve the EJB from my rich client with no problems. However, if I execute the exact
same code from within a startup class (i.e. com.iplanet.ias.startup.StartupClass) then I get the following error repeated until memory runs out:
javax.naming.NameNotFoundException: MessageRepositoryBean : Invalid guid null in
GDS
at com.netscape.server.ejb.EjbContext.lookup(Unknown Source)
at com.netscape.server.jndi.RootContext.lookup(Unknown Source)
at com.netscape.server.jndi.RootContext.lookup(Unknown Source)
at javax.naming.InitialContext.lookup(InitialContext.java:357)
at com.netscape.ejb.CorbaHomeFactoryImpl.ConstructEJBHome(Unknown Source
at com.netscape.CosNaming.NamingContextImpl.resolve(Unknown Source)
at org.omg.CosNaming._NamingContextImplBase.invoke(_NamingContextImplBas
e.java:233)
at com.sun.corba.ee.internal.corba.ServerDelegate.dispatch(ServerDelegat
e.java:236)
at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:227)
at com.sun.corba.ee.internal.iiop.CachedWorkerThread.doWork(IIOPConnecti
on.java:262)
at com.sun.corba.ee.internal.iiop.CachedWorkerThread.run(IIOPConnection.
java:230)
javax.naming.NameNotFoundException: MessageRepositoryBean : Invalid guid null in
In previous answers people have suggested adding various things to the app server classpath. This does not make any difference for me. I am puzzled why code runs fine in a normal rich client, but not in a startup class. Here is the code that I am running:
try
String contextFactory = "com.sun.jndi.cosnaming.CNCtxFactory";
String providerURL = "iiop://localhost:9010";
Properties p = new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY, contextFactory);
p.put(Context.PROVIDER_URL, providerURL);
Context context = new InitialContext(p);
MessageRepositoryHome home = (MessageRepositoryHome)
PortableRemoteObject.narrow(context.lookup("ejb/MessageRepository"), MessageRepositoryHome.class);
MessageRepository repository = home.create();
catch(Exception e)
e.printStackTrace(Log.err);
System.exit(1);
Thanks for your help,
MarkI was mistaken in this posting. I was able to access the EJB from the startup class so there must be something else that I am doing to cause this problem. I'd still like to know why I get those invalid guid errors though.
By the way, please forgive me for using the gender-specific gentlemen in my posting. That was accidental. -
Having trouble moving mail messages from one user to another
I am trying to move mail messages from one user to another on my Macbook, and I cannot seem to do it. I've tried archive, but I don't think I'm doing it right. Any suggestions?
Thanks,
Noreen
Message was edited by: reensjpI had to go to the Mac store to get the answer to this one... i was archiving correctly, but you need to save the mbox files to your desktop, then move them to the shared folder, that way all users have access. I also had to edit the permissions on the files, as the user i wanted to have the emails didn't have permission to even look at the files.
Noreen
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