setup-java/.github/java.json

{
    "problemMatcher": [
        {
            "owner": "java",
            "pattern": [
                {
                    "regexp": "^Exception in thread \"(.*)\" (.*): (.*)$",
                    "code": 2,
                    "message": 3
                }
            ]
        },
    	{
			"owner": "javac",
			"pattern": [
				{
					"regexp": "^([^:]+):(\\d+): (warning|error): (.+?)$",
					"file": 1,
					"line": 2,
					"severity": 3,
					"message": 4
				}
			]
       }
    ]
}