I migrated 4 projects from WSAD 4 to WSAD 5 on the same day using the same methodology. Only one of those converted project can be exported as a jar. In addition, that one project is the only one that shows up in the "J2EE" perspective. I only can see the others from the "Java" perspective. Taking this one step further I noticed that the ".project" files from the projects that I can't export are missing elements in my <natures> node. Once I manually mocked the <natures> node from the working project I am able to export the project as a jar. However, I have no idea what I am mocking up. I am afraid that I could introduce another problem by moving forward on this path. Any suggestions?