Trouble in communicating with another EJB from an EJB

I have created a stateless session bean, and inside this bean I have methods that calls methods in another stateless session bean (called myEJB, for example). When I run the code, it kept giving me the "noClassDefFoundError":
java.rmi.RemoteException: Error in ejbCreate:; nested exception is:
java.lang.NoClassDefFoundError: com.mybean.myEJBHome
Someone suggested to me that this is because they aren't remote objects, so I created local interfaces for "myEJB". When I run the code again (by binding to the Local interface now), I got this error:
javax.naming.LinkException: [Root exception is javax.naming.NameNotFoundException: Unable to resolve
'app/ejb/mybeans.jar#myEJB/local-home' Resolved: 'app/ejb/ Unresolved:'mybeans.jar#myEJB' ;
remaining name 'mybeans.jar#myEJB/local-home']; Link Remaining Name:
'java:app/ejb/mybeans.jar#myEJB/local-home'
Any ideas??
Thanks

To refer a Ejb from another Ejb include <ejb-ref> in ejb-jar.xml
<session>
<ejb-name>EjbA</ejb-name>
<ejb-ref>
<ejb-ref-name>Ejb2</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>com.ejb.Ejb2Home</home>
<remote>com.ejb.Ejb2</remote>
</ejb-ref>
<session>
Include a <reference-discriptor> in weblogic-ejb-jar.xml
<weblogic-enterprise-bean>
<ejb-name>EjbA</ejb-name>
<reference-descriptor>
<ejb-reference-description>
<ejb-ref-name>Ejb2</ejb-ref-name>
<jndi-name>protocol://<Ejb2host>:<PortNumber>/com.ejb.Ejb2Home</jndi-name>
</ejb-reference-description>
</reference-descriptor>
</weblogic-enterprise-bean>
Example <jndi-name>:http://localhost:7001/com.ejb.Ejb2Home
In EjbA bean class refer to Ejb2 method with a reference to Ejb2 remote interface.
InitialContext initialContext = new InitialContext();
Ejb2Home ejb2Home = (Ejb2Home)initialContext.lookup("protocol://<Ejb2host>:<PortNumber>/com.ejb.Ejb2Home");

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Message was edited by: mangamak1

Hi
Testing Camera and Cable is important - very common origin to problems.
Especially the Cable (fortunately)
I had a serious accident some Years ago. FW-connector on the back of that Mac
and I plugging in the FW-connector 180 deg wrong. Shouldn't go but sorry
to say did and without a gigant of effort.
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Tricky:
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my thoughts.
Capture/Import problems:
a) File-Vault is on - turn it off
b) don’t Daisy chain camcorder - external hard disk - Mac
(except for some Canon-Cameras)
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e) Bad RAM-chips
f) drop outs on the miniDV-tape - make a camera to camera copy on a tape which You have previous recorded with a time code (dummy recording).
g) FW-wire cable OK?
h) Break in the time-code on the miniDV tape (make a camera to camera copy on a tape which is prerecorded with nothing/anything so that the tape has a time-code from beginning to the end)
i) defective camera TRY IT ON ANOTHER MAC !
j) remove bookmarks in iMovie project
k) Do You have desktop pictures or screen-savers active? Try turning them off.
l) Updating - OS has to be a clean install - not an update eg from X.3.x to X.4.x (no good)
OS X.4.0-2 needs a clean install to work (I use X.3.9)
m) Updating QT and/or other updates (to 7 needs v6 to be cleaned out first)
QT v.7 needs a clean install to work (I use 6.5.2)
n) Have you tried the crazy fix:
Open GarageBand, play a few notes, close it and reopen iMovie. The camera should import fine now. (Sue/SDillini)
o) NEW (from Sue/SDillini):
Trash the Font Collections Folder.
These files are found:
/YourUserName/Library/FontCollections folder.
Drag the folder to the trash and launch iMovie. iMovie will create a new FontCollections folder containing the files it needs when it next opens.
p) or thrashing the com.apple.imovie.plist file (Rodney Brown2)
q) - Other programs interfering like Flip4Mac
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Mac:
• hardware
◊ Slow hard disk (fragmented: repair permissions, repair hard disk, use a faster hard disk)
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10% free is recommended + space for Import/Capture + work space (about 4 to
5 times the amount needed for Capture) eg on a 200Gb hard disk You need 20Gb + (one hour tape)
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◊ Disconnect all other ext devices (FW and USB) exept Camera (and keyboard + mouse) and try again
◊ Rebuild Desktop (Tech-tool or fingersetting during start-up) (System up to 9)
◊ Reset PRAM (Tech-tool or keyboard finger settings alt-cmd-P-R ??)
◊ Reset PMU ( Restting the PMU...is the the alt-ctrl-shift and powerbutton shortcut? ) (Sue)
PMU: http://docs.info.apple.com/article.html?artnum=86760
PMU/SMU are essentially the same in the PM G5.
◊ Reset SMU
SMU: http://docs.info.apple.com/article.html?artnum=300341
◊ Bad RAM-chips
◊ disconnect Mac from powerline (not just switch off, really plug out) for a few minutes to reset FW ports
• software
◊ File-Vault is on - turn it off
◊ Something is occupying the CPU/System, like other programs, Internet etc.
◊ Do You have desktop pictures or screen or energy-savers active? Try turning them off.
◊ Updating - OS has to be a clean install - not an update eg from X.3.x to X.4.x (no good) OS X.4.0-5 needs a clean install to work (I use X.3.9)
◊ Updating QT and/or other updates (to 7 needs v6 to be cleaned out first) QT v.7.0.0-4 needs a clean install to work (I use 6.5.2)
◊ Have you tried the crazy fix: Open GarageBand, play a few notes, close it and reopen iMovie. The camera should import fine now. Sue/SDillini
◊ Running iDVD at the same time as iMovie can cause problems: (Lennart Thelander)
◊ If You also have installed FinalCut Express/pro there are possibly problems with this
◊ Other programs that interferes like Flip4Mac
◊ Codecs added to QuickTime
◊ Old plug-ins to iMovie or third party alike
iMovie:
◊ remove bookmarks in iMovie project
◊ Trash: com.apple.iMovie.plist and com.apple.iMovie3.plist : files (Xinram)
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◊ don’t Daisy chain Camcorder <--> external hard disk <--> Mac
◊ FW-wire cable, is it OK?
◊ USB/USB2 is NO GO !
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◊ Cheque FW connection at Mac end. OK?
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◊ The Camera is set to VTR ? (not as when You ”film” record with it)
◊ You may be need to go to the Camera menu and select digital out.
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◊ connect camera to power-line, not battery-only....(Karsten Schlüter)
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◊ Drop outs on the miniDV-tape - make a camera to camera copy on a tape which You have previous recorded with a time code (dummy recording).
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More:
◊ follow advises here http://docs.info.apple.com/article.html?artnum=43000
◊ follow Grandmaster Dan's advice for Sony cameras here: http://www.danslagle.com/mac/iMovie/usage/5020.shtml
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Hi Siarhei,
thank's for your answers , i'll explain the scenario , i think i copied wrong the code that i have ,
i have two EAR's applications , i want to call one EJB from the other EJB in other EAR , the call have to be remote , my code is the next :
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provider-name="sap.com"
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regards

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Trouble in communicating with another EJB from an EJB

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