Packaged jar is not working

[dkovalenko]

Hello, after a quick test I can't get working jar out of this example app.

% ./pants package ::                                       
14:04:12.59 [INFO] Wrote dist/src.jvm.org.pantsbuild.example.app/bin.jar

% java -jar dist/src.jvm.org.pantsbuild.example.app/bin.jar
Error: Main method is not static in class org.pantsbuild.example.app.ExampleApp, please define the main method as:
   public static void main(String[] args)

java -cp dist/src.jvm.org.pantsbuild.example.app/bin.jar org.pantsbuild.example.app.ExampleApp
Error: Main method is not static in class org.pantsbuild.example.app.ExampleApp, please define the main method as:
   public static void main(String[] args)

Am I doing something wrong? Thanks.

[benjyw]

Hi, I think you've found a bug in this example repo! The main() method should be in an object, not a class, IIRC.

We'll fix this asap, thanks for the bug report!

[benjyw]

Note that running the main requires the scala runtime on the classpath. We'll add some documentation on how to do that.

[benjyw]

Fixed in #6

[dkovalenko]

Note that running the main requires the scala runtime on the classpath. We'll add some documentation on how to do that.

It's now clear, thanks. Is any way to "run" the application without packaging it to jar?

[benjyw]

I believe we haven't yet implemented ./pants run for JVM, but it should be coming soon.

[benjyw]

I wonder if we should have a java-only main(), so that people can run it with java -jar and not have to worry about scala...

[stuhood]

Thanks for the report! Have opened pantsbuild/pants#14171 about this. In the meantime, I'll likely declare the dependency explicitly.