Error: Could not find or load main class Caused by: java.lang.ClassNotFoundException: java code example

Example 1: > Task :run FAILED Error: Could not find or load main class Caused by: java.lang.ClassNotFoundException:

Check your build.gradle file and update the application block:

application {
    // Define the main class for the application.
  	// insert the entire name of the class
    mainClassName = 'packageName.MainClass'
}

Example 2: eclipse Error: Could not find or load main class main java.lang.ClassNotFoundException

// Run configurations -> Run -> Run configurations
// In the Classpath tab select "Advanced"
// Add where Eclipse usually put the *.class for the projects, which is (usually) "bin".

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