I need to use SQL developer where there are existing connections. however, SQL developer 3.1 asked the java.exe location, and I chose java 6, now I can launch SQL developer but not able to continue running it. SQL developer starts and then disappears without any warning. Could anyone help me on this problem?
Can you start the exe from the BIN subdirectory? That should open a command console, and maybe you can see any error messages there that explain what's happening. For step-by-step directions, here's some help:
Install SQL Developer to a new directory and run it from there and see if that helps you get around your current install's issue.