File New Server > JBoss AS 7.1
use Download and install of AS 7.1.1

when in the background and download finishes a nosuchmethoderror occurs:

I assume this is a build error but its rather alarming we have it.

java.lang.NoSuchMethodError: org.jboss.tools.runtime.handlers.JBossASHandler.isEnabled()Z
at org.jboss.tools.runtime.handlers.JBossASHandler.getRuntimeDefinition(JBossASHandler.java:251)
at org.jboss.tools.runtime.core.internal.RuntimeDetector.getRuntimeDefinition(RuntimeDetector.java:43)
at org.jboss.tools.runtime.core.JBossRuntimeLocator.searchDirectory(JBossRuntimeLocator.java:119)
at org.jboss.tools.runtime.core.JBossRuntimeLocator.searchDirectory(JBossRuntimeLocator.java:89)
at org.jboss.tools.runtime.core.JBossRuntimeLocator.searchForRuntimes(JBossRuntimeLocator.java:66)
at org.jboss.tools.runtime.core.JBossRuntimeLocator.searchForRuntimes(JBossRuntimeLocator.java:42)
at org.jboss.tools.runtime.core.JBossRuntimeLocator.searchForRuntimes(JBossRuntimeLocator.java:37)
at org.jboss.tools.runtime.core.util.RuntimeInitializerUtil.createRuntimeDefinitions(RuntimeInitializerUtil.java:77)
at org.jboss.tools.runtime.ui.download.DownloadRuntimeDialog.createRuntimes(DownloadRuntimeDialog.java:692)
at org.jboss.tools.runtime.ui.download.DownloadRuntimeDialog.downloadAndInstall(DownloadRuntimeDialog.java:596)
at org.jboss.tools.runtime.ui.download.DownloadRuntimeDialog.access$9(DownloadRuntimeDialog.java:499)
at org.jboss.tools.runtime.ui.download.DownloadRuntimeDialog$9.run(DownloadRuntimeDialog.java:487)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)