Gradle – Could not find or load main class

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I see two problems here, one with sourceSet another with mainClassName.

  1. Either move java source files to src/main/java instead of just src. Or set sourceSet properly by adding the following to build.gradle.

    sourceSets.main.java.srcDirs = ['src']

  2. mainClassName should be fully qualified class name, not path.

    mainClassName = "hello.HelloWorld"

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