From 187fe37cd7cc2ee83a7bcbe3f47faf75b4fa1540 Mon Sep 17 00:00:00 2001
From: Florian Schmaus <flo@geekplace.eu>
Date: Mon, 30 Jan 2017 11:59:09 +0100
Subject: [PATCH] Fix MucEnterConfiguration.Builder.withPresence(Presence)
 throw ISE

when presence is of type available. This inverts the logic to fix
this.
---
 .../org/jivesoftware/smackx/muc/MucEnterConfiguration.java | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MucEnterConfiguration.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MucEnterConfiguration.java
index 93ba18392..a08604a4f 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MucEnterConfiguration.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MucEnterConfiguration.java
@@ -95,15 +95,16 @@ public final class MucEnterConfiguration {
         /**
          * Set the presence used to join the MUC room.
          * <p>
-         * The 'to' value of the given presence will be overridden.
+         * The 'to' value of the given presence will be overridden and the given presence must be of type
+         * 'available', otherwise an {@link IllegalArgumentException} will be thrown.
          * <p>
          *
          * @param presence
          * @return a reference to this builder.
          */
         public Builder withPresence(Presence presence) {
-            if (presence.getType() == Presence.Type.available) {
-                throw new IllegalArgumentException();
+            if (presence.getType() != Presence.Type.available) {
+                throw new IllegalArgumentException("Presence must be of type 'available'");
             }
 
             joinPresence = presence;