On page 58, when I run AdviceClient it's giving me following error: Exception in thread "main" java.lang.NoClassDefFoundError: AdviceClient and till this last step, everything was just fine. ???
Howdy Sean, You're having a plain old Java problem at the moment... the JVM can't find your AdviceClient, so be CERTAIN that you're in the right directory, etc. And once again verify that your command-line looks like this: java -cp {$CLASSPATH}:AdviceAppClient.jar AdviceClient (allowing for the difference in syntax for your particular shell, of course) Be certain that the -cp APPENDS to the current classpath, rather than changes it. And are you absolutely certain that your classpath includes the *current* directory (i.e. the '.') (it probably does if you made it this far). Remember, the AdviceClient is NOT in a package, so you should simply compile it and run it from the very same directory. So verify again that your class is really in your current working directory that you cd'd to. When I run this, I cd into the /advice directory; the same way I did to compile the client. I'm thinking that it has to be something wrong either with your current working directory, OR that your current directory isn't on the classpath somehow. You might want to give us some more details. Isn't it actually a little fun getting this *&%$# thing to work? My favorite thought: It takes about 5 minutes to write a simple EJB, maybe 10 if you include the client, and about two days to get it deployed. The good news is, once you do get it up and running, as long as you don't touch anything, ever again, on your computer, it should still work. Unless maybe one of those pesky neutrinos comes slamming into your JVM. And there's always a little Heisenberg uncertainty too... and let's not forget entropy... gosh, I'm getting depressed now just thinking about it. Quantum physics can really SUCK sometimes OK, sorry. I've snapped out of it Keep us posted. You WILL get this to work Sean! You're almost there... thanks for being persistent. cheers, Kathy [see you all tomorrow... it's bedtime in Boulder]
OK, now I've completely forgotten what system you are on... this doesn't sound like J2EE 1.3.1... or else there's still a classpath issue or... hmmm... can you please verify your system details again? And maybe paste in the stack trace here. Thanks! -Kathy
I 'll write down two different senario: First Senario: (Considernig I have set the CLASSPATH to E:\j2sdkee1.3.1E:\j2sdkee1.3.1\lib\j2ee.jar; D:\Java\Head First EJB Projects\projects\advice\AdviceAppClient.jar; D:\Java\Head First EJB Projects\projects\advice through Windows Environment Variables): and then: D:\Java\Head First EJB Projects\projects\advice>java AdviceClient javax.naming.CommunicationException: Can't find SerialContextProvider at com.sun.enterprise.naming.SerialContext.getProvider(SerialContext.jav a:63) at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:120 ) at javax.naming.InitialContext.lookup(Unknown Source) at AdviceClient.go(AdviceClient.java:20) at AdviceClient.main(AdviceClient.java:12) Second Senario: (Setting CLASSPATH at runtime in COMMAND PROMPT) and then: D:\Java\Head First EJB Projects\projects\advice>java -cp d:\java\head first ejb projects\projects\advice:AdviceAppClient.jar AdviceClient Exception in thread "main" java.lang.NoClassDefFoundError: first j2sdee1.3.1 and j2sdk1.3.1 and Win 2000 Thank you very much in advance Sean
Originally posted by Sean Mohseni: I 'll write down two different senario: First Senario: (Considernig I have set the CLASSPATH to E:\j2sdkee1.3.1E:\j2sdkee1.3.1\lib\j2ee.jar; D:\Java\Head First EJB Projects\projects\advice\AdviceAppClient.jar; D:\Java\Head First EJB Projects\projects\advice through Windows Environment Variables): and then: D:\Java\Head First EJB Projects\projects\advice>java AdviceClient javax.naming.CommunicationException: Can't find SerialContextProvider at com.sun.enterprise.naming.SerialContext.getProvider(SerialContext.jav a:63) at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:120 ) at javax.naming.InitialContext.lookup(Unknown Source) at AdviceClient.go(AdviceClient.java:20) at AdviceClient.main(AdviceClient.java:12) Second Senario: (Setting CLASSPATH at runtime in COMMAND PROMPT) and then: D:\Java\Head First EJB Projects\projects\advice>java -cp d:\java\head first ejb projects\projects\advice:AdviceAppClient.jar AdviceClient Exception in thread "main" java.lang.NoClassDefFoundError: first j2sdee1.3.1 and j2sdk1.3.1 and Win 2000 Thank you very much in advance Sean
For the 2nd scenario, the no class found exception is thrown because you don't have currently directory in your classpath (I assume you are running in your currently directory: D:\Java\Head First EJB Projects\projects\advice>java -cp "d:\java\head first ejb projects\projects\advice";AdviceAppClient.jar;. AdviceClient the period at the end means include current directory. Try this, I think you need to include j2ee.jar as well.
Yes I,m running in the directory and i'm not sure about usnig "" that you had but after modifiying to: D:\Java\Head First EJB Projects\projects\advice>java -cp d:\java\head first ejb projects\projects\advice\AdviceAppClient.jar;. adviceClient Exception in thread "main" java.lang.NoClassDefFoundError: first So ??? Sean
You need "" around the directory added to your classpath as Edward suggested because the folder "head first ejb project" has spaces in it's name. With the way you are running things now, D:\java\head is added as the classpath and "first" is the class you are trying to run. Hence, the error.
I have done the same but look at the result: D:\Java\Head First EJB Projects\projects\advice>java -cp "d:\java\head first ejb projects\projects\advice";AdviceAppClient.jar;. AdviceClient javax.naming.NoInitialContextException: Need to specify class name in environmen t or system property, or as an applet parameter, or in an application resource f ile: java.naming.factory.initial at javax.naming.spi.NamingManager.getInitialContext(Unknown Source) at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source) at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source) at javax.naming.InitialContext.lookup(Unknown Source) at AdviceClient.go(AdviceClient.java:20) at AdviceClient.main(AdviceClient.java:12) ??? Sean
I have done this too: D:\Java\Head First EJB Projects\projects\advice>java -cp "d:\java\head first ejb projects\projects\advice";AdviceAppClient.jar;e:\JNDI\jndi.properties;. AdviceClient javax.naming.NoInitialContextException: Need to specify class name in environmen t or system property, or as an applet parameter, or in an application resource f ile: java.naming.factory.initial at javax.naming.spi.NamingManager.getInitialContext(Unknown Source) at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source) at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source) at javax.naming.InitialContext.lookup(Unknown Source) at AdviceClient.go(AdviceClient.java:20) at AdviceClient.main(AdviceClient.java:12) Still ??? Sean
Hey Sean, Here my 2 cents. Keep in mind I'm a newbie. Try including your current classpath in the classpath like the following D:\Java\Head First EJB Projects\projects\advice>java -cp %classpath%;"d:\java\head first ejb projects\projects\advice";AdviceAppClient.jar;e:\JNDI\jndi.properties;. AdviceClient Good luck, Keith Rosenfield SCJP SCWCD
Hi Keith, D:\Java\Head First EJB Projects\projects\advice>java -cp %classpath%;"d:\java\he ad first ejb projects\projects\advice";AdviceAppClient.jar;e:\JNDI\jndi.properti es;. AdviceClient Exception in thread "main" java.lang.NoClassDefFoundError: First Still... Sean
Unfortunately: D:\Java\Head First EJB Projects\projects\advice>java -cp "%classpath%;d:\java\head first ejb projects\projects\advice;AdviceAppClient.jar;e:\JNDI\jndi.propertie s;." AdviceClient javax.naming.CommunicationException: Can't find SerialContextProvider at com.sun.enterprise.naming.SerialContext.getProvider(SerialContext.jav a:63) at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:120 ) at javax.naming.InitialContext.lookup(Unknown Source) at AdviceClient.go(AdviceClient.java:20) at AdviceClient.main(AdviceClient.java:12)
Hey Sean, I would like to try running your code on my machine. If I can recreate the problem, maybe I can find a solution. Please e-mail the code to keithrfield@hotmail.com.
Here is the code I used to get the AdviceClient to work: import javax.naming.*; import java.rmi.*; import javax.rmi.*; import headfirst.*; import javax.ejb.*; import java.util.*; public class AdviceClient { public static void main(String args[]) { new AdviceClient().go(); } public void go() { try { Hashtable map = new Hashtable(); map.put("java.naming.factory.initial", "com.sun.jndi.cosnaming.CNCtxFactory"); map.put("java.naming.provider.url", "iiop://localhost:1050"); Context ic = new InitialContext(map); Object o = ic.lookup("Advisor"); AdviceHome adviceHome = (AdviceHome) PortableRemoteObject.narrow(o, AdviceHome.class);
Advice advice = adviceHome.create(); System.out.println(advice.getTheMessage()); } catch (Exception ex) { ex.printStackTrace(); } } } Don't forget you'll need the AdviceAppClient.jar and j2ee.jar files in the classpath.
Hey Sean, Your problem apparently is in the way you are getting the InitialContext. It is possible that the properties you have put in the hashtable are incorrect. You may want to try using the no argument constructor to get the InitialContext instead. That is how I did it. Good luck.
Hi Keith, I tried Ringo Code and didn't work and also I tried to Email you my code that is telling me the Email address is not correct. So Would you please check the Email address for me then I send the folder to you. Thank you very much in advance, Sean
Hi Keith, Ringo was the name of the person that 4 row above, has some code as the solution that didnot work for me. anyway I've sent you an Email. Thanks, Sean
I have done some changes and now I get: D:\Java\Head First EJB Projects\projects\advice>java -cp "%classpath%;d:\java\he ad first ejb projects\advice;AdviceAppClient.jar;e:\JNDI\jndi.properties;." AdviceClient javax.naming.NameNotFoundException: Adviser not found <<no stack trace available>> And when I try to compile Kathy's code that I have downloaded, I get: D:\EJB Head First\Code jar\HFEJBCODE\advice>javac -cp "d:\ejb head first\code jar\hfejbcode\advice\AdviceAppClient.jar" AdviceClient.java javac: invalid flag: -cp Usage: javac <options> <source files> where possible options include: -g Generate all debugging info -g:none Generate no debugging info -g:{lines,vars,source} Generate only some debugging info -O Optimize; may hinder debugging or enlarge class file -nowarn Generate no warnings -verbose Output messages about what the compiler is doing -deprecation Output source locations where deprecated APIs are us ed -classpath <path> Specify where to find user class files -sourcepath <path> Specify where to find input source files -bootclasspath <path> Override location of bootstrap class files -extdirs <dirs> Override location of installed extensions -d <directory> Specify where to place generated class files -encoding <encoding> Specify character encoding used by source files -target <release> Generate class files for specific VM version I don't know what the problem is with synthax but anyway I set the classpath through Environment variables in windows and I still get: D:\EJB Head First\Code jar\HFEJBCODE\advice>javac AdviceClient.java AdviceClient.java:28: cannot resolve symbol symbol : method getMessage () location: interface headfirst.Advice System.out.println(advisor.getMessage()); ^ 1 error Any idea appreciated. Sean
Hey Sean, I'm pretty sure I know why you are getting the following error
Originally posted by Sean Mohseni:
D:\Java\Head First EJB Projects\projects\advice>java -cp "%classpath%;d:\java\he ad first ejb projects\advice;AdviceAppClient.jar;e:\JNDI\jndi.properties;." AdviceClient javax.naming.NameNotFoundException: Adviser not found <<no stack trace available>>
When you deployed your bean you probably name it advisor, with an o. The client is looking for a bean named adviser, with an e. Just change the client to look for advisor, recompile and run. Good Luck,
Hi Keith, You were right and now my problem is the Corba problem that I think I know how to solve: D:\Java\Head First EJB Projects\projects\advice>java -cp "%classpath%;d:\java\he ad first ejb projects\advice;AdviceAppClient.jar;e:\JNDI\jndi.properties;." Advi ceClient java.rmi.RemoteException: CORBA BAD_OPERATION 0 No; nested exception is: org.omg.CORBA.BAD_OPERATION: minor code: 0 completed: No org.omg.CORBA.BAD_OPERATION: minor code: 0 completed: No at java.lang.Class.newInstance0(Native Method) at java.lang.Class.newInstance(Unknown Source) at com.sun.corba.ee.internal.iiop.messages.ReplyMessage_1_2.getSystemExc eption(ReplyMessage_1_2.java:93) at com.sun.corba.ee.internal.iiop.ClientResponseImpl.getSystemException( ClientResponseImpl.java:108) at com.sun.corba.ee.internal.POA.GenericPOAClientSC.invoke(GenericPOACli entSC.java:132) at org.omg.CORBA.portable.ObjectImpl._invoke(Unknown Source) at headfirst._Advice_Stub.getAdvice(Unknown Source) at AdviceClient.go(AdviceClient.java:25) at AdviceClient.main(AdviceClient.java:12) but can you tell me about two other problem that I have with Kathy's Source code. Thanks, Sean
Now that I changed my method names and reDeploy the application, it gives me the same error that it gives me when I run Kathy's downloaded code. D:\Java\Head First EJB Projects\projects\advice>javac AdviceClient.java AdviceClient.java:25: cannot resolve symbol symbol : method getMessage () location: interface headfirst.Advice System.out.println(advisor.getMessage()); ^ 1 error Considering the classpath is set. Thanks, Sean
Hey Sean, What you might want to try is to undeploy the bean. Then get rid of any files created as the result of deploying such as any .ear files and AdviceAppClient.jar and anything else that wasn't a file that you were responsible for creating. Also get rid of the .class files. Then recompile the bean, home and component classes. Deploy the bean. Then recompile the client. This process will ensure that the file AdviceAppClient.jar has been updated properly with the new versions of the files. Good luck,
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