I used the Oracle SQL Developer(Version: 2.1.0.63) and has the same problem. Then I changed the ide.conf file located under ide\bin\.
follow the below steps:
1. open the file ide.conf located under ide\bin\
2. located line "AddVMOption -XX:MaxPermSize=640M".
3. changed to "AddVMOption -XX:MaxPermSize=256M".
4. done.
and the Oracle SQL Developer works.
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