To open "Eclipse" you need to install the legacy Java SE 6 runtime

Question

Just installed a fresh version of Kepler 64bit "for Java Developers" on Yosemite, getting this error on first launch. Any thoughts on how to fix? Really do not want to downgrade my Java version!

Answer 1

I just encountered this in another Eclipse-based app on Yosemite and figured out (with help from the references below) how to get the app running without installing the legacy Java SE 6 JRE. Here are the steps in case it helps other devs get Eclipse working.

PRECONDITIONS

$ sw_vers -productVersion  10.10.1 $ java -version java version "1.8.0_25" Java(TM) SE Runtime Environment (build 1.8.0_25-b17) Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode) 

Other configurations might work; this is my environment.

STEPS

1. Edit the info.plist for the JDK after installing:

   $ sudo nano `/usr/libexec/java_home -V`/../info.plist 

2. Change the following section:

   <key>JVMCapabilities</key>  <array>   <string>CommandLine</string>  </array>  

   to

   <key>JVMCapabilities</key>  <array>   <string>JNI</string>   <string>BundledApp</string>   <string>WebStart</string>   <string>Applets</string>   <string>CommandLine</string>  </array> 

3. Try to open the app from the command-line (not sure if this is strictly necessary, but what I did)

   You should get an error "(app) can't be opened because it is from an unidentified developer."

4. Go to System Preferences: Security Settings (General) and you should see the recent app next to a button "Open Anyway" -- click this button to open the app.

This opens Eclipse without requiring the separate download of the legacy Java SE 6 files.

NOTES

When I was solving this on MTGBrowser (below) I also followed advice to change the info.plist of the app by adding the following section to the 'Eclipse' key:

<string>-vm</string><string>/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/java</string> 

However, I'm not sure that's strictly required. In any case, that wasn't sufficient -- I also had to change the JDK info.plist and security as described above for a complete solution.

REFERENCES

• https://sourceforge.net/p/mtgbrowser/bugs/402/#c78c
• http://crunchify.com/os-x-mavericks-eclipse-java-issue/
• http://mac-how-to.wonderhowto.com/how-to/open-third-party-apps-from-unidentified-developers-mac-os-x-0158095/