xvrl opened a new pull request #8392: Do not assume system classloader is URLClassLoader in Java 9+ URL: https://github.com/apache/incubator-druid/pull/8392 * Fallback to parsing classpath for hadoop task in Java 9+ In Java 9 and above we cannot assume that the system classloader is an instance of URLClassLoader. This change adds a fallback method to parse the system classpath in that case, and adds a unit test to validate it matches what JDK8 would do. Note: This has not been tested in an actual hadoop setup, so this is mostly to help us pass unit tests. * Remove granularity test of dubious value One of our granularity tests relies on system classloader being a URLClassLoaders to catch a bug related to class initialization and static initializers using a subclass (see https://github.com/apache/incubator-druid/issues/2979) This test was added to catch a potential regression, but it assumes we would add back the same type of static initializers to this specific class, so it seems to be of dubious value as a unit test and mostly serves to illustrate the bug. relates to #5589
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