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via Google Groups by Brian Rosner, 10 months ago
duplicate entry: META-INF/ > at java.util.zip.ZipOutputStream.putNextEntry > (ZipOutputStream.java:175) > at java.util.jar.JarOutputStream.putNextEntry > (JarOutputStream.java:92)
java.util.zip.ZipException: duplicate entry: META-INF/
 >         at java.util.zip.ZipOutputStream.putNextEntry
 > (ZipOutputStream.java:175)
 >         at java.util.jar.JarOutputStream.putNextEntry
 > (JarOutputStream.java:92)	at sun.tools.jar.Main.update(Main.java:507)	at sun.tools.jar.Main.run(Main.java:184)	at sun.tools.jar.Main.main(Main.java:1022)