Linkage error

[Former Member]

Hi All,

I am deploying a web application in the form of an ear file on SAP J2EE WAS. The deployment using NWDS goes fine but at runtime I have the following error:

java.lang.LinkageError: loader constraints violated when linking javax/xml/namespace/QName class

It seems like it is a Java compatibility error, I recompiled using the WAS's version of JDK but it doesn’t help.

Have you ever encountered such problems? Any hint may help

Thank you.

[Former Member · Accepted solution]

Hi,

make sure that you use the same Version of NWDS and WAS. The linkageError can be a hint to different versions...

best Regards,

Rene

[Former Member · Accepted solution]

Hi,

I developed my web app an a normal eclipse, and all I am using NWDS for is to build the ear and deploy.

First I got a NoSuchMethodError on the QName(String, String, String). Then I used an sda to use my own version of javax.xml.namespace.QName.

Now I have this LinkageError, I recompiled the javax.xml.namespace package using JDK 1.4.2_08 (the same as my WAS) but still have the LinkageError

Do you really think updating my NWDS might help?

Thanks

Adil

[Former Member · Accepted solution]

Hi,

My linkageError problem is not solved yet.

After some investigation I concluded that It is a classloader problem and that I need my QName class to be loaded with the same class loader as my servlet and other API.

I tried to put all my API including my servlet in the same jar and then in an SDA. Doing so make the server throw a :

com.sap.engine.services.servlets_jsp.server.exceptions.ServletNotFoundException: Cannot load the requested servlet [HRW/servlet/WebServiceCaller].

I need help to get my servlet loaded from within the SDA. any ideas?

Thank you