I have a JFrame with a JPanel in it. I'm loading some untrusted 3rd party code that needs to add some components to my JPanel. How can I sandbox my JPanel such that to make it impossible for the 3rd party components to access resources outside the JPanel (eg. the JFrame)?
Sandbox JPanel within JFrame
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This will be difficult since your JPanel extends JComponent that has getParent() which would return your JFrame... Since every component in Swing implement that, it is likely that your third-party component also implement that. You could try to overwrite these methods, but I don't think that swing will still work correctly because you would cut of the ComponentTree by doing that...
Could you explain how you load that untrusted code? Is it a library or do you load that at runtime by reflection or something similar?