Getting Error in NW : jce.jar is not signed by a trusted signer.

We have deployed our application on SAP NetWeaver 6.40 SP11. We have used j2sdk1.4.2._12 and in our application we are using cryptography. But when we start our application it is giving following exception
java.lang.SecurityException: Cannot authenticate JCE framework java.util.jar.JarException: jar:file:/C:/j2sdk1.4.2_12/jre/lib/jce.jar!/ is not signed by a trusted signer.
Same cryptography is working on other application servers.

importing public key?
have you ever seen JCE source code?
well if you write provider you have to send it to SUN they will sign it,
with Java Code Signing CA certificate.
These certficate's other part of asymetric cipher code is hardcoded in jce.jar
JCESecurity.java.
I finally solved that configuration problem with making own modified jce.jar.,
with provider signature checking turned off.
Btw i think problem was caused with multiple libraries in system using same classes.
There was some archaic jce.jar in SUNwam or somewhere.

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