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The ClassPathProviderImpl creates several instances of CP.BOOT which is illegal as the CP is a live object which supports listening. The CP clients are holding it and listen on it. The returned CP is also broken, after each call of the CP.findClassPath(CP.BOOT) the new jfxrt.jar is added, so after 3 calls the CP looks like Proxy(Proxy(Proxy(boot, jfx), jfx),jfx).
Fixed jet-main 40e0c2cb693b