kezhenxu94 opened a new pull request #3541: Upgrade guava version to support higher JDK version URL: https://github.com/apache/skywalking/pull/3541 Please answer these questions before submitting pull request - Why submit this pull request? - [x] Bug fix - [ ] New feature provided - [ ] Improve performance - Related issues #3540 and #3477 https://github.com/apache/skywalking/blob/5b039e9747fac98444b4ec423a5d57524202f286/oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/annotation/AnnotationScan.java#L54-L56 the `classpath.getTopLevelClassesRecursive("org.apache.skywalking")` returns empty `set` under JDK 8+, and it turns out to be an issue of Guava, see https://github.com/google/guava/issues/3249#issuecomment-416234877 , this patch upgrades the Guava version to 23.1, and I've verified locally the exception disappear and OAP starts successfully
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