Hi all, Bug: https://bugs.openjdk.java.net/browse/JDK-8066985
The problem is that packer/unpacker changes global state( default time zone ) without proper synchronization: http://hg.openjdk.java.net/jdk9/client/jdk/file/a159e5358e25/src/java.base/share/classes/com/sun/java/util/jar/pack/PackerImpl.java#l85
however javadoc says that it's save to use it in concurrent way if each thread has it's own packer/unpacker instance: http://hg.openjdk.java.net/jdk9/client/jdk/file/a159e5358e25/src/java.base/share/classes/java/util/jar/Pack200.java#l149
The fix is: 1. first packer/unpacker saves default time zone 2. the last set it back. Webrev: http://cr.openjdk.java.net/~mcherkas/8066985/webrev.00/ Thanks, Mikhail.
