Using JDK 9 with Project Jigsaw in IntelliJ IDEA
Andrey Cheptsov

Seem like Java 9 support is broken for latest JDK9 builds, IDEA is unable to find basic classes like Object or Integer in a project with configured JDK 1.9 and Java 9 language level. If I try to force rebuild the project it fails with the “Error:java: invalid source release: 1.9”. I think, there is some kind of a fallback to Java 1.8 compiler of hosting JDK or something like that.

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