Consider to use the DebugAdapterDescriptorFactor #751

Instead of making VS Code start new debug sessions by connecting to a port via this code we suggest that you use the official API that we've introduced for this use case.

Mock debug shows how the DebugAdapterDescriptorFactory can be used to start a server and make VS Code connect to it.

The factory can be registered for Java in the extension's activate function like this:

context.subscriptions.push(vscode.debug.registerDebugAdapterDescriptorFactory('java', factory));