I have newly installed I cloned project I work with on other workstation without issues, but cannot start any class with main method and IDEA says: I found other comment to check Lombok works and I see it is fine. How to fix the problem? Answer Some configuration were rolled over by the update. How to get back to JDK8

Some configuration were rolled over by the update. How to get back to JDK8 :Go to File > “Project Structure”.In the new window, in left tree, choose “Project Settings” > ProjectAmong params, look at “Project language level”. For me the IJ update had changed it from “8” to “16”. Hence the error. Just put it back to “8” and rollll!

Java, Intellij IDEA problem Unrecognized option: –add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED

I have newly installed

IntelliJ IDEA 2021.2 (Ultimate Edition)
Build #IU-212.4746.92, built on July 27, 2021
Licensed to XXXXXX
Subscription is active until August 15, 2021.
Runtime version: 11.0.11+9-b1504.13 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Linux 5.4.0-80-generic
GC: G1 Young Generation, G1 Old Generation
Memory: 2048M
Cores: 3

Kotlin: 212-1.5.10-release-IJ4746.92
Current Desktop: X-Cinnamon

I cloned project I work with on other workstation without issues, but cannot start any class with main method and IDEA says:

Abnormal build process termination: 
/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin/java -Xmx700m -Djava.awt.headless=true -Djava.endorsed.dirs="" -Dcompile.parallel=false -Drebuild.on.dependency.change=true -Djdt.compiler.useSingleThread=true -Daether.connector.resumeDownloads=false -Dio.netty.initialSeedUniquifier=-5972351880001011455 -Dfile.encoding=UTF-8 -Duser.language=en -Duser.country=US -Didea.paths.selector=IntelliJIdea2021.2 -Didea.home.path=/home/pm/idea-IU-212.4746.92 -Didea.config.path=/home/pm/.config/JetBrains/IntelliJIdea2021.2 -Didea.plugins.path=/home/pm/.local/share/JetBrains/IntelliJIdea2021.2 -Djps.log.dir=/home/pm/.cache/JetBrains/IntelliJIdea2021.2/log/build-log -Djps.fallback.jdk.home=/home/pm/idea-IU-212.4746.92/jbr -Djps.fallback.jdk.version=11.0.11 -Dio.netty.noUnsafe=true -Djava.io.tmpdir=/home/pm/.cache/JetBrains/IntelliJIdea2021.2/compile-server/rfg-survey-api_cc70fc05/_temp_ -Djps.backward.ref.index.builder=true -Djps.track.ap.dependencies=false --add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED -Dtmh.instrument.annotations=true -Dtmh.generate.line.numbers=true -Dkotlin.incremental.compilation=true -Dkotlin.incremental.compilation.js=true -Dkotlin.daemon.enabled -Dkotlin.daemon.client.alive.path="/tmp/kotlin-idea-12426594439704512301-is-running" -classpath /home/pm/idea-IU-212.4746.92/plugins/java/lib/jps-launcher.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/lib/tools.jar org.jetbrains.jps.cmdline.Launcher /home/pm/idea-IU-212.4746.92/lib/slf4j.jar:/home/pm/idea-IU-212.4746.92/lib/idea_rt.jar:/home/pm/idea-IU-212.4746.92/lib/platform-api.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/maven-resolver-transport-file-1.3.3.jar:/home/pm/idea-IU-212.4746.92/lib/forms_rt.jar:/home/pm/idea-IU-212.4746.92/lib/util.jar:/home/pm/idea-IU-212.4746.92/lib/annotations.jar:/home/pm/idea-IU-212.4746.92/lib/3rd-party.jar:/home/pm/idea-IU-212.4746.92/lib/kotlin-stdlib-jdk8.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/maven-resolver-connector-basic-1.3.3.jar:/home/pm/idea-IU-212.4746.92/lib/jna-platform.jar:/home/pm/idea-IU-212.4746.92/lib/protobuf-java-3.15.8.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/jps-builders-6.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/javac2.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/aether-dependency-resolver.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/jps-builders.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/jps-javac-extension-1.jar:/home/pm/idea-IU-212.4746.92/lib/jna.jar:/home/pm/idea-IU-212.4746.92/lib/jps-model.jar:/home/pm/idea-IU-212.4746.92/plugins/java/lib/maven-resolver-transport-http-1.3.3.jar:/home/pm/idea-IU-212.4746.92/plugins/JavaEE/lib/jasper-v2-rt.jar:/home/pm/idea-IU-212.4746.92/plugins/Kotlin/lib/kotlin-reflect.jar:/home/pm/idea-IU-212.4746.92/plugins/Kotlin/lib/kotlin-plugin.jar:/home/pm/idea-IU-212.4746.92/plugins/ant/lib/ant-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/uiDesigner/lib/jps/java-guiForms-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/eclipse/lib/eclipse-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/eclipse/lib/eclipse-common.jar:/home/pm/idea-IU-212.4746.92/plugins/IntelliLang/lib/java-langInjection-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/Groovy/lib/groovy-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/Groovy/lib/groovy-constants-rt.jar:/home/pm/idea-IU-212.4746.92/plugins/maven/lib/maven-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/gradle-java/lib/gradle-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/devkit/lib/devkit-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/javaFX/lib/javaFX-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/javaFX/lib/javaFX-common.jar:/home/pm/idea-IU-212.4746.92/plugins/JavaEE/lib/javaee-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/webSphereIntegration/lib/jps/javaee-appServers-websphere-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/weblogicIntegration/lib/jps/javaee-appServers-weblogic-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/JPA/lib/jps/javaee-jpa-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/Grails/lib/groovy-grails-jps.jar:/home/pm/idea-IU-212.4746.92/plugins/Grails/lib/groovy-grails-compilerPatch.jar:/home/pm/idea-IU-212.4746.92/plugins/Kotlin/lib/jps/kotlin-jps-plugin.jar:/home/pm/idea-IU-212.4746.92/plugins/Kotlin/lib/kotlin-jps-common.jar:/home/pm/idea-IU-212.4746.92/plugins/Kotlin/lib/kotlin-common.jar org.jetbrains.jps.cmdline.BuildMain 127.0.0.1 34781 9f0681bb-da2a-48db-8344-900ddeb29804 /home/pm/.cache/JetBrains/IntelliJIdea2021.2/compile-server
Unrecognized option: --add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

I found other comment to check Lombok works and I see it is fine.

How to fix the problem?

Answer

Some configuration were rolled over by the update. How to get back to JDK8 :

Go to File > “Project Structure”.
In the new window, in left tree, choose “Project Settings” > Project
Among params, look at “Project language level”. For me the IJ update had changed it from “8” to “16”. Hence the error. Just put it back to “8” and rollll!

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Answer