intellij-idea-artifact-xxxxwar-exploded-has-invalid-extension

Stop/undeploy your current artifact deployment Edit your run config,

and in the Deployment tab, remove the current exploded war/ear

artifact Open the project’s Artifacts settings and add a new artifact

Use the plus button to add a new war or (in my case) ear exploded artifact

Give it a name, then edit the Output directory to add the appropriate extension (.war or .ear)

In the Output Layout section where you see {output root}, use the plus button to add an Artifact

Select the desired exploded artifact

Edit your run config again, and in the Deployment tab, add the new workaround exploded artifact