One often has to use JDeveloper when working on Oracle Technology.
So you’ll be surprised to discover that while your development computers may allow up to 8Gb or 16Gb Ram; JDeveloper by default will only use 512Mb!
And the same applies to your integrated WebLogic environment.

JDeveloper before increase will only use 512Mb memory!

I’ll highly advise to do yourself a favor and enhance your JDeveloper performance with a recent JDK and all the memor your computer can give.
Your sanity and development productivity will skyrocket.

To do so, you’ll need to update those three files as follow :

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