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Aiside from play .jar support the addition of a Java Webstart deployment support can be really nice for people developing games and desktop apps. JNLP files are now core java and the 5.0 Webstart is really improved making multiplatform deployment and update support a reality. The project manager can generate the jnlp according to the libraries used by the project and prepare a directory with the .jnlp + all the required jars, ready for uploading on a .jnlp enabled server. The option to enable the uploading too can be seriously taken into consideration.
Yes, a JNLP project type has certainly been considered. There was no time to implement one for 4.0. However there has been some experimentation with the concepts. Tim was starting to write one. Besides the obvious deployment benefit, JNLP permits a much stronger project concept than the standard Java project type since it lets you define how to aggregate JARs (subprojects) in a structured way so they can be run as a coherent app - more like a J2EE EAR, for example.
*** This issue has been marked as a duplicate of 52638 ***