How to install Jdeveloper 11.1.1.9.0 on OS X El Capitan

You will need Apple JDK 1.6 to run the JDeveloper installer. Download and install Apple Java 1.6 from: http://support.apple.com/kb/DL1572
After Apple JDK 1.6 was installed, you should check "Known Issues" from Jdev Release Notes and create symbolic link as mentioned above:

cd /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/  
 su root  
 mkdir jre  
 cd jre  
 mkdir lib  
 cd lib  
 ln -s ../../../Classes/classes.jar rt.jar

And now you could run Jdev installer:

/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/java -jar ~/Downloads/jdevstudio11119install.jar

When installer asks for JDK, point it to Oracle JDK 1.7 location. JDeveloper and integrated WebLogic Server will use Oracle JDK 1.7 after installation. You could find JDK 1.7 in your OS if you'll run:

/usr/libexec/java_home -v 1.7

Now get back to release notes and open jdev.conf from MW_HOME/jdeveloper/jdev/bin. Add this line to jdev.conf:

AddVmOption -Djava.io.tmpdir=/var/tmp

Now you can run Jdev!