Debugger should allow user to specify launching cli command in launch.json

[testforstephen]

In order to debug spring mvc projects with vscode-java-debug, user need run mvnDebug tomcat7:run on cmd first, then configure attach options in launch.json.
Actually debugger can integrate the launch command in launch.json. And use launchInTerminal feature to execute the launching command in VSCode integrated terminal automatically. Then debugger attaches to the debug port to start debugging.

[akaroml]

Suggest configuring preLaunchTask to trigger the mvnDebug tomcat7:run in launch.json.

@testforstephen, please see if this can address the problem. If so, we won't need to add launchInTerminal now.

[testforstephen]

@akaroml Yes, use preLaunchTask can fix the issue perfectly.

[testforstephen]

Add a new task in tasks.json:

    "tasks": [
        {
            "taskName": "mvnDebug",
            "type": "shell",
            "command": "mvnDebug tomcat7:run",
            "group": "build"
        }
    ]

Then add preLaunchTask in launch.json:

        {
            "type": "java",
            "name": "Debug (Attach)",
            "request": "attach",
            "hostName": "localhost",
            "port": 8000,
            "timeout": 30000,
            "sourcePaths": [
                "${workspaceRoot}"
            ],
            "preLaunchTask": "mvnDebug"
        }

Select the new debug configuration as default config and Click F5. It can launch spring mvc in debug mode.

[akaroml]

Can we ask vscode to add an event like "postDebugTask" to let the user do some cleanup works?

[akaroml]

The original issue can be resolved by adding preLaunchTask. It would be nicer if vscode provide an event to allow cleanups. But this issue can be closed for now.