Catch NullPointerException of Amazon AWS ELB during healthcheck

VerteilteSysteme-Examples/src/verteiltesysteme/socket/simple/TCPServer.java

@@ -21,9 +21,16 @@ class TCPServer {
 			BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
 			DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
 
-			clientSentence = inFromClient.readLine();
-			capitalizedSentence = clientSentence.toUpperCase() + '\n';
-			outToClient.writeBytes(capitalizedSentence);
+			// Try/Catch hinzugefügt, nachdem bei Einsatz Amazon AWS (Healthcheck des ELB) clientSentence null war  
+			try {
+				clientSentence = inFromClient.readLine();
+				capitalizedSentence = clientSentence.toUpperCase() + '\n';
+				outToClient.writeBytes(capitalizedSentence);
+			} catch (IOException ioe) {
+				ioe.printStackTrace();
+			} catch (NullPointerException npe) {
+				npe.printStackTrace();
+			}
 		}
 	}
 }