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This issue was reported manually by Charlie3D. It already has 1 duplicates Build: NetBeans IDE 8.0.2 (Build 201411181905) VM: Java HotSpot(TM) 64-Bit Server VM, 25.40-b25, Java(TM) SE Runtime Environment, 1.8.0_40-b26 OS: Windows 8 User Comments: Charlie3D: Run my first JSP has failed... Stacktrace: java.io.IOException: Invalid response at org.xnio.http.HttpUpgradeParser.parseVersion(HttpUpgradeParser.java:157) at org.xnio.http.HttpUpgradeParser.parse(HttpUpgradeParser.java:55) at org.xnio.http.HttpUpgrade$HttpUpgradeState$UpgradeResultListener.handleEvent(HttpUpgrade.java:419) at org.xnio.http.HttpUpgrade$HttpUpgradeState$UpgradeResultListener.handleEvent(HttpUpgrade.java:400) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66)
Created attachment 152935 [details] stacktrace
What is your WildFly configuration as it looks like the plugin can't connect to WildFly ?
Created attachment 152952 [details] WildFly configuration
Created attachment 152953 [details] WildFly client configuration
You have changed the management port of your WildFly instance. This is not supported in Netbeans 8.0.2. You should try current nightly dev as you can specify the management port (9991 in your case).
*** Bug 251546 has been marked as a duplicate of this bug. ***