The Oracle sql developer is NOT supported on 64 bits JDK. To solve it,install a 32 bits / x86 JDK and update your sql developer config file,so that it points to the 32 bits JDK.

Edit the “sqldeveloper.conf“,which can be found under “{ORACLE_HOME}\sqldeveloper\sqldeveloper\bin\sqldeveloper.conf“,make sure “SetJavaHome” is pointing to your 32 bits JDK.

For example,“SetJavaHome C:\Program Files (x86) \Java\jdk1.6.0_13“.