Exception in execute jar

java.lang.SecurityException: SHA1 digest error for com/.../classfilename.class

I just changed 开发者_如何学Goone class in jar using winrar

The jar you modified was signed. Now your modification was detected by the system which doesn't allow execution of modified, signed jar files.

There's a reason that the jar was signed in the first place ...

You should try to unzip your jar, Put your new class file and sign jar again with the required certificate.