Hawkular (Agent) won't start properly without -Djava.awt.headless=true on Mac OS X

2015-11-23 12:18:57,692 ERROR [org.hawkular.agent.monitor.service.MonitorService] (Controller Boot Thread) HAWKMONITOR010054: Agent encountered errors during start up and will be stopped.: java.lang.Error: Cannot load com.apple.laf.AquaLookAndFeel
	at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1351)
	at javax.swing.UIManager.initialize(UIManager.java:1459)
	at javax.swing.UIManager.maybeInitialize(UIManager.java:1426)
	at javax.swing.UIManager.getDefaults(UIManager.java:659)
	at javax.swing.UIManager.getString(UIManager.java:788)
	at javax.swing.filechooser.UnixFileSystemView.<clinit>(FileSystemView.java:610)
	at javax.swing.filechooser.FileSystemView.getFileSystemView(FileSystemView.java:86)
	at oshi.software.os.mac.local.MacFileSystem.getFileStores(MacFileSystem.java:52)
	at oshi.software.os.mac.MacHardwareAbstractionLayer.getFileStores(MacHardwareAbstractionLayer.java:100)
	at org.hawkular.agent.monitor.protocol.platform.OshiPlatformCache.getFileStores(OshiPlatformCache.java:111)
	at org.hawkular.agent.monitor.protocol.platform.OshiPlatformCache.discoverResources(OshiPlatformCache.java:391)
	at org.hawkular.agent.monitor.protocol.platform.PlatformDriver.fetchNodes(PlatformDriver.java:53)
	at org.hawkular.agent.monitor.protocol.platform.PlatformDriver.fetchNodes(PlatformDriver.java:38)
	at org.hawkular.agent.monitor.protocol.Discovery.discoverChildren(Discovery.java:121)
	at org.hawkular.agent.monitor.protocol.Discovery.discoverChildren(Discovery.java:155)
	at org.hawkular.agent.monitor.protocol.Discovery.discoverAllResources(Discovery.java:108)
	at org.hawkular.agent.monitor.protocol.EndpointService.doDiscoverAll(EndpointService.java:197)
	at org.hawkular.agent.monitor.protocol.EndpointService.start(EndpointService.java:353)
	at org.hawkular.agent.monitor.protocol.ProtocolService.start(ProtocolService.java:73)
	at org.hawkular.agent.monitor.protocol.ProtocolServices.start(ProtocolServices.java:197)
	at org.hawkular.agent.monitor.service.MonitorService.startMonitorService(MonitorService.java:491)
	at org.hawkular.agent.monitor.service.MonitorService$1.propertyChange(MonitorService.java:390)
	at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
	at org.jboss.as.controller.ControlledProcessStateService.stateChanged(ControlledProcessStateService.java:114)
	at org.jboss.as.controller.ControlledProcessState.setRunning(ControlledProcessState.java:115)
	at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:277)
	at java.lang.Thread.run(Thread.java:745)