[java] Package doesn't exist error in intelliJ

In case you're facing very weird "unable to resolve java, sun packages problem", try the following:

  1. Open Project Structure and change Project SDK to another version, example: java 8 -> 9; 11->13, etc, and wait until it re-index all jdk's jars. Switch between jdks with same version may not work! (Ex: jetbrains jdk11 -> openjdk 11)
  2. Open a new project (or create a empty one); pause new project's indexing; close the old one; start indexing; open the old project and pause the new project's indexing and wait.

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