I created a view in my database using SQL Developer version 2.1.1 (for Mac). Now when I click the SQL tab on the view editor a message box pops up saying "Generating DDL..." This runs for several minutes until the connection finally times out. The eventual error message says "Generation of DDL failed"
Bugs Fixed since Oracle SQL Developer 1.5.1 was released in June 2008.
Oracle SQL Developer 1.5.5 is scheduled for inclusion in Oracle Database 11gR2. It has a few code fixes on top of those added in release 1.5.3 and 1.5.4. This list of bugs fixed is a combination of fixes in 1.5.3, 1.5.4 and 1.5.5 and is not all-inclusive. For the list of bugs fixed between SQL Developer 1.5.0 and SQL Developer 1.5.1
see this link