MAC OS X: To open "IntelliJ IDEA" you need to install the legacy Java SE 6 runtime.

Change IntelliJ JVM version to a version you have installed to avoid this error. 

1. Check your version of java:

          alexandra$ java -version

          java version "1.8.0_20"

          Java(TM) SE Runtime Environment (build 1.8.0_20-b26)

          Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)

2. Open IntelliJ configuration file:

          vim /Applications/IntelliJ\ IDEA\ 13\ CE.app/Contents/Info.plist

3. Change JVMVersion to whatever version of Java you have installed

Change this - 

<key>JVMVersion</key>

 <string>1.6*</string> 

to this -

<key>JVMVersion</key>

 <string>1.8*</string>