Bind to IPv4 Loopback Address

cli/src/main/java/de/jplag/cli/server/ReportViewer.java

@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.BindException;
+import java.net.InetAddress;
 import java.net.InetSocketAddress;
 
 import org.apache.commons.lang3.ArrayUtils;
@@ -27,7 +28,6 @@ public class ReportViewer implements HttpHandler {
     private static final int SUCCESS_RESPONSE = 200;
     private static final int NOT_FOUND_RESPONSE = 404;
     private static final int MAX_PORT_LOOKUPS = 4;
-    private static final String DEFAULT_IP_ADDRESS = "0.0.0.0";
 
     private final RoutingTree routingTree;
     private final int port;
@@ -59,12 +59,14 @@ public int start() throws IOException {
             throw new IllegalStateException("Server already started");
         }
 
+        System.setProperty("java.net.preferIPv4Stack", "true");
+
         int currentPort = this.port;
         int remainingLookups = MAX_PORT_LOOKUPS;
         BindException lastException = new BindException("Could not create server. Probably due to no free port found.");
         while (server == null && remainingLookups-- > 0) {
             try {
-                server = HttpServer.create(new InetSocketAddress(DEFAULT_IP_ADDRESS, currentPort), 0);
+                server = HttpServer.create(new InetSocketAddress(InetAddress.getByAddress(new byte[] {127, 0, 0, 1}), currentPort), 0);
             } catch (BindException e) {
                 logger.info("Port {} is not available. Trying to find a different one.", currentPort);
                 lastException = e;