javax.xml.transform.TransformerException: java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "java.lang.reflect.InvocationHandler.invoke(Object, java.lang.reflect.Method, Object[])" is null java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "java.lang.reflect.InvocationHandler.invoke(Object, java.lang.reflect.Method, Object[])" is null Cannot invoke "java.lang.Boolean.booleanValue()" because the return value of "java.lang.reflect.InvocationHandler.invoke(Object, java.lang.reflect.Method, Object[])" is null