What is the issue with Jenkins when using Java 12 OpenJDK and the JAVA_HOME environment variable is not set up properly?

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When using Jenkins with Java 12 OpenJDK and the JAVA_HOME environment variable is not set up properly, it may cause issues with the Jenkins build process. Jenkins may not be able to locate the Java executable and may throw a "Java not found" error during the build. This can also cause issues with plugins and other tools that rely on a properly configured Java environment.