[java][lsp] Error: write EPIPE when refreshing the browser after the backend start

[kittaakos]

It breaks the Java LS.

root ERROR Uncaught Exception:  Error: write EPIPE
root ERROR Error: write EPIPE
    at _errnoException (util.js:992:11)
    at WriteWrap.afterWrite [as oncomplete] (net.js:864:14)
root INFO Stopped watching the git repository: file:///Users/akos.kitta/git/eclipse.jdt.ls
root ERROR Uncaught Exception:  Error: This socket is closed
root ERROR Error: This socket is closed
    at Socket._writeGeneric (net.js:729:18)
    at Socket._write (net.js:783:8)
    at doWrite (_stream_writable.js:397:12)
    at writeOrBuffer (_stream_writable.js:383:5)
    at Socket.Writable.write (_stream_writable.js:290:11)
    at Socket.write (net.js:707:40)
    at Sender.sendFrame (/Users/akos.kitta/Desktop/theia/packages/core/node_modules/ws/lib/Sender.js:390:20)
    at Sender.send (/Users/akos.kitta/Desktop/theia/packages/core/node_modules/ws/lib/Sender.js:312:12)
    at WebSocket.send (/Users/akos.kitta/Desktop/theia/packages/core/node_modules/ws/lib/WebSocket.js:377:18)
    at WebSocketChannel.doSend (/Users/akos.kitta/Desktop/theia/packages/core/lib/node/messaging/messaging-contribution.js:226:24)