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Cannot find Main class from test classpath [message #1801738]

Fri, 25 January 2019 12:20

Alex Mising name

Messages: 149
Registered: March 2010

Senior Member

Hello,

I am using 2018-09 on Windows with a Maven multi-module project.

I created a launch configuration of type "Java Application" (using Java 8 for it).

In the classpath tab, I have NOT checked "Exclude test code" because I want to launch a main class that is actually coming from a Maven test classpath dependency.

However, when I try to launch it, I get the error:

Error: Could not find or load main class my.test.classpath.Main

Now, looking at the "Show Command Line" output I can see that target/test-classes and Maven's test-scope dependencies are NOT present.

Any idea what I am doing wrong?

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Re: Cannot find Main class from test classpath [message #1801827 is a reply to message #1801738]

Mon, 28 January 2019 07:09

Till Brychcy

Messages: 3
Registered: May 2016

Junior Member

M2E has implemented test classpath seperation before the concept was added to JDT and it doesn't use this checkbox yet.

It uses a heuristic (see org.eclipse.m2e.jdt.internal.launch.MavenRuntimeClasspathProvider.getArtifactScope(ILaunchConfiguration)) :

When JUnit and TestNG Tests are launched, the test scope is used.
When a Java Application is run, it checks if the main class is from a test source folder. If yes, it uses the test scope, otherwise the main scope.

So if your main is in a binary test dependency, this goes wrong.

As workaround, you could create a main method in a test source folder that just delegates to the actual main method you want to launch.

You can help by creating a bug report about this at bugs.eclipse.org (product=m2e, component=jdt)

[Updated on: Mon, 28 January 2019 07:10]

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