No valid JDK found

java.lang.Exception: No valid JDK found in your eclipse workspace for JBoss Tools Launching Support. Please add one at Window -> Preferences -> Installed JREs.

java.lang.Exception: No valid JDK found in your eclipse workspace for JBoss Tools Launching Support. Please add one at Window -> Preferences -> Installed JREs.
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.findFirstValidVMInstall(Tools.java:275)
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.findSecondaryVMInstall(Tools.java:432)
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.findHomeDirectoryToAddToClasspath(Tools.java:417)
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.getToolsJar(Tools.java:146)
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.getToolsLoader(Tools.java:121)
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.reset(Tools.java:114)
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.<init>(Tools.java:82)
	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.getInstance(Tools.java:73)
	at org.jboss.tools.common.jdt.debug.tools.ToolsCore.getActiveProcessIds(ToolsCore.java:179)
	at org.jboss.tools.jmx.jvmmonitor.internal.tools.JvmAttachHandler.updatesActiveJvms(JvmAttachHandler.java:100)
	at org.jboss.tools.jmx.jvmmonitor.internal.tools.JvmAttachHandler$1.run(JvmAttachHandler.java:78)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)