From Maven, how do I run a class that lives under src/test/java?

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I faced the same problem and figured it out.

Shortly speaking, the class must be compiled before exec:java goal. (It surely works without test-compile phase if the class is already compiled by other user action. Note that Pascal Thivent, in his answer, invoked mvn test before exec:java.)

$ mvn -Dexec.mainClass=... -Dexec.classpathScope=test test-compile exec:java

You can prove it for yourself if you want to see the ClassNotFoundException again.

$ mvn -Dexec.mainClass=... -Dexec.classpathScope=test clean exec:java

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