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Be aware that it is not really directly related to the JDK - it is related to the JAX-WS API and implementation being used. By default the JDK comes bundled with Metro (or at least the important bits of it), which is the reference implementation of JAX-WS. Java 7 will naturally have a newer version of the reference implementation (to match the new JAX-WS 2.2 API), so the difference will originate there.
My point there is that the project has some decent documentation you can check:
java.net projects are also tied to a jira issue tracker where you could register a new issue if you think you've found one. If you really can't find a solution or workaround you could try bundling an older JAX-WS 2.1 API and implementation with your application to see if that resolves the compatibility issue you're experiencing.