Build failed when running `gradlew run` about onjava8-examples HOT 3 OPEN

You are running Gradle with JDK 17 (based on the error message "Unsupported class file major version 61").

Following the Gradle compatibility matrix JDK 15 is the highest supported Java version for Gradle versions lower than 7.0. The wrapper in the repository is configured to be version 6.8.1.

To solve the issue, the easiest (without changing anything in the repository) would be to run gradlew with a JDK version lower than 16.

Another possibility could be to update the Gradle wrapper to version 7.3 (as this one would support JDK 17). But updating the wrapper probably require other changes too.

from onjava8-examples.

I found the solution worked for me: modify the file named java.gradle in the gradle subfolder, change the sourceCompatibility and targetCompatibility to the jdk version you're using, then everything works fine.

from onjava8-examples.

PS: version above Java14(or 15, 16?) needs higher version of gradle, so the Java 17 is not able to be used in this project.

from onjava8-examples.