Tomcat6 throws java.lang.NoSuchMethodError instead a localised error messages.

mod_cluster is compiled with jbossweb-2.1.x where we have in org/apache/tomcat/util/res/StringManager.java.
public String getString(String key, Object arg1, Object arg2, Object arg3)
but Tomcat has:
public String getString(final String key, final Object... args)

So java.io.FileNotFoundException