I installed graalvm-ce-19.2.0 (/usr/lib/jvm/graalvm-ce-19.2.0/bin/java) and GraalVM contains /usr/lib/jvm/graalvm-ce-19.2.0/src.zip file. All java core files are open fine but not classes from org.graalvm.polyglot.*. How to attach sources to Eclipse IDE?
The sources for the org.graalvm.polyglot package can be found under jre/lib/boot/graal-sdk.src.zip. Those can be attached to graal-sdk.jar in the IDE. In general GraalVM contains *.src.zip files with the sources next to the corresponding .jar files.