Struts 1 Validation - XML defined Constants in \xNN Format leading to false errors on bea weblogic 11g

Im defining validation constants in "Struts 1" validation using a notation like:

<constant-name>chars</constant-name>
<constant-value>[\x20\x21\x5C\x22]</constant-value>

This seemed to work for a long time on Oracle IAS 10g, but now after migration to Bea Weblogic 11g the validation against this MASK returns false errors.

<var-name>mask</var-name>
<var-value>^$开发者_JS百科{chars}*$</var-name>

Debugging into the Validation Framework I have found out, that the above constant value is seemingly taken literally.

The Files are encoded in ANSI as ISO-8859-1 Standard with Unix Format.

Does anyone know what could have gone wrong here?

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The Cause for my Problem was seemingly that multiple source files were encoded in UTF-8 while the Server environment was expecting ansi encoding.