Duplicate :
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When some XML-related API is used (perhaps, preferences API) on Linux, Mustang b51, it sometimes causes this warning message to be displayed on the screen: Warning: Could not get charToByteConverterClass! It was discovered that this message comes from com/sun/org/apache/xml/internal/serializer/Encodings.java, findCharToByteConverterMethod method. It contains System.err.println in its exception handler. The method is very strange as it doesn't return any value except for null.