René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"unable to work with objects created using net.imglib2.loops.ClassCopyProvider","articleBody":"Hi!\n\nwhile working on this https://github.com/BIOP/ijp-atlas/issues/7#issuecomment-2619511900, I got stuck when i tried to get a [`java.net.imglib2.display.RealARGBColorConverter`](https://github.com/imglib/imglib2/blob/176c0f26dc7527d79c5b44e29071b8967fbcb84b/src/main/java/net/imglib2/display/RealARGBColorConverter.java) object built with [`net.imglib2.display.RealARGBColorConverterFactory`](https://github.com/imglib/imglib2/blob/176c0f26dc7527d79c5b44e29071b8967fbcb84b/src/main/java/net/imglib2/display/RealARGBColorConverterFactory.java#L53). The factory uses [`net.imglib2.loops.ClassCopyProvider`](https://javadoc.scijava.org/ImgLib2/net/imglib2/loops/ClassCopyProvider.html), which internally instantiate the objects with [`net.imglib2.loops.ClassCopyLoader`](https://github.com/imglib/imglib2/blob/176c0f26dc7527d79c5b44e29071b8967fbcb84b/src/main/java/net/imglib2/loops/ClassCopier.java#L90), _a different classloader from the one used by scyjava_.\n\nIn the end, jpype crashes with:\n\n```\nTraceback (most recent call last):\n  File \"org.jpype.manager.TypeManager.java\", line 0, in org.jpype.manager.TypeManager.findClassForObject\nException: Java Exception\n\nThe above exception was the direct cause of the following exception:\n\nTraceback (most recent call last):\n  [...]\njava.lang.java.lang.IllegalAccessError: java.lang.IllegalAccessError:\n    failed to access class net.imglib2.display.RealARGBColorConverterFactory from class net.imglib2.display.RealARGBColorConverterFactory$Imp\n    (\n        net.imglib2.display.RealARGBColorConverterFactory is in unnamed module of loader 'app';\n        net.imglib2.display.RealARGBColorConverterFactory$Imp is in unnamed module of loader net.imglib2.loops.ClassCopier$ClassCopyLoader @25464154\n    )\n\n```\n\nCan you please help me? Do you think there is an ~easy workaround (perhaps telling jpype to avoid trying to find the class for that object?)","author":{"url":"https://github.com/carlocastoldi","@type":"Person","name":"carlocastoldi"},"datePublished":"2025-01-29T15:57:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/72/scyjava/issues/72"}