1. Up-gradation to class loader architecture to avoid deadlocks in non-hierarchical class-loader topologies.
2. A method has been added to free the underlying resources, such as open files, held by a URLClassLoader.
3. A lightweight fork/join framework, flexible and reusable synchronization barriers, transfer queues, a concurrent-reference HashMap, and thread-local pseudo-random number generators.
4. Upgraded to supported version of Unicode 6.0 for more from internationalization.
5. the java.util.Locale class to support IETF BCP 47 and UTR 35 now.
6. Now there will be a two separate locale for user and user-interface.
7. New APIs for filesystem access, scalable asynchronous I/O operations, socket-channel binding and configuration, and multicast datagrams
8. New fully functional file system provider NIO.2 for zip/jar archiving.
9. JDBC upgraded to 4.1 and Rowset to 1.1
10. XML stack is upgraded to new stable version for more on web.
11. JSR 292 providing support for dynamically typed language.
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