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Package java.awt.datatransfer
Class MimeTypeParameterList
Method hashCode
File java\awt\datatransfer\MimeTypeParameterList.java, line 51

public int hashCode() {
    int code = Integer.MAX_VALUE/45; // "random" value for empty lists
    String paramName = null;
    for (Enumeration enum = this.getNames();
        (enum.hasMoreElements()); paramName = (String)enum.nextElement()){
        code += paramName.hashCode();
        code += this.get(paramName).hashCode();
    }
     return code;
} // hashCode()

Expression
paramName = (String)enum.nextElement()
is executed only AFTER first loop iteration; on first iteration paramName is
always null, therefore the next line
code += paramName.hashCode();
must cause NullPointer error.