Duplicate :
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Name: sdR10048 Date: 11/11/2002 JDK version: Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-beta-b05) Java HotSpot(TM) Client VM (build 1.4.2-beta-b05, mixed mode) Method public MemoryHandler() always throws NPE. Doc says: --------- public MemoryHandler() Create a MemoryHandler and configure it based on LogManager configuration properties. Small demo: ----------- import java.util.logging.*; class T { public static void main(String args[]) { MemoryHandler handler = new MemoryHandler(); } } Output: ------- MemoryHandler can't load handler "null" java.lang.NullPointerException Exception in thread "main" java.lang.RuntimeException: Can't load null at java.util.logging.MemoryHandler.<init>(MemoryHandler.java:100) at T.main(T.java:5) ======================================================================