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how-to-run-eclipse-on-macos.md

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How to run a custom Eclipse on macOS

(Apparantly, this was only tested on AMD64-based Macs = Intel Macs only!)

Problem

If you just run a custom Eclipse without further configuration on modern macOS systems, you will propably get one of the following error messages:

Solution

The following steps are necessary to run a custom Eclipse on modern macOS systems.

  • Allow your Terminal the privileges to Full Disk Access and Developer Tools in the Settings app of macOS.
    • Settings -> Privacy & Security -> Full Disk Access -> Add Terminal app and/or toggle its setting to on.
    • Settings -> Privacy & Security -> Developer Tools -> Add Terminal app and/or toggle its setting to on.
  • Install the recommend JDK, e.g., Eclipse Temurin JDK 17.
  • Download the custom Eclipse archive (e.g., from https://emoflon.org or GitHub).
  • Extract it with a double click.
  • Right click on Eclipse.app -> Show Package Contents -> Navigate into Contents.
  • Open Info.plist with a text editor of your choice (e.g., VSCodium).
  • Open a Terminal window and run $ /usr/libexec/java_home
    • This should return you a single path to your default Java JDK installation, e.g., /Library/Java/JavaVirtualMachines/temurin-17.jdk/Contents/Home
  • Leave your Terminal window open and return to your text editor (showing the contents of Info.plist). Scroll down into the block below the line <key>Eclipse</key> and enter your Java JDK's path with this syntax: <string>-vm</string><string>$YOUR_PATH/bin/java</string>
    • Example: <string>-vm</string><string>/Library/Java/JavaVirtualMachines/temurin-17.jdk/Contents/Home/bin/java</string>
  • Save the file, close your editor, and open your Terminal window again.
  • Navigate the Terminal window to your Eclipse folder using cd $FOLDER_NAME, e.g., cd Downloads/eclipste.
    • Verify that your custom Eclipse.app is located in the currently selected folder via ls.
  • Sign the modified Eclipse.app with this command: $ sudo codesign --force --deep --sign - ./Eclipse.app
    • When requested, type in the password of your user account and hit enter.
  • Run $ xattr -d com.apple.quarantine ./Eclipse.app within the Terminal.
  • As for the Terminal app, add the privileges for Full Disk Access and Developer Tools to your Eclipse.app.

You can now start your custom Eclipse.app with a double click on it. If macOS asks if you really want to start the "broken" app, select Run.

Currently known issues

... besides the hustle to get Eclipse running.

  • Custom eMoflon settings will not be honored.
    • The default perspective is not the eMoflon perspective.
    • The default workspace encoding may not be UTF8.
    • The default git clone path is not ${workspace_loc}/git as required to run eMoflon.
  • There is no specific build for ARM64/Apple ARM-based macOS systems.

References/Pointers to useful websites