How to make an internal Java package accessible in Eclipse?

user_9908535 0
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I have a legacy Java (8) project opened in Eclipse with Java 11 (or Java 10). Eclipse is now rightly complaining about inaccessible packages. E.g. com.apple.laf.AquaComboBoxUI.

When compiling from command line I can make those packages accessible explicitly by adding a parameter to javac:

--add-exports java.desktop/com.apple.laf=ALL-UNNAMED

Is there a way to do the same from inside the Eclipse IDE? I tried to add an accessible rule on the JDK library. But that seems to have no effect. Any ideas?

And yes, I know, we should migrate the project to use only official APIs. But that's a long, long way...

java-11 legacy-code eclipse java
3 Answers

I'm answering my own question, since I found a solution.

  1. In Eclipse settings navigate to: Java Build Path → Libraries → Modulepath → JRE System Library
  2. Expand it and double click on: Is modular (modifies encapsulation)
  3. Switch to Details tab
  4. Add a new export: E.g. java.desktop → com.apple.laf
user_99085350

You need to setup problem severity. This falls under forbidden reference (access rules) under Java Compiler -> Errors/Warnings.

user_6003790

As mentioned here you can add the parameters passed with javac in command line to Eclipse with these steps:

  • Click on Run->Run Configurations.

  • In the window that appeared under Main tab Browse the project and the Main class for which you want to pass the arguments.

  • Now click on the Arguments tab.
  • In the text-box labeled Program arguments:, type ${string_prompt}
  • Click on Apply and Close.

Now when you run your Java application a prompt will appear. You can add all your arguments separated with space here.

user_64078580
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