Installer step 4 empty and NPE thrown

nattura:9.0.0 rasp$ java -jar jboss-devstudio-9.0.0.Alpha2-v20150413-0429-B2940-installer-standalone.jar 
java.lang.NullPointerException
	at com.jboss.devstudio.core.installer.JREPathPanel.change(JREPathPanel.java:483)
	at com.jboss.devstudio.core.installer.PathSelectionPanel.fireChange(PathSelectionPanel.java:237)
	at com.jboss.devstudio.core.installer.PathSelectionPanel.access$000(PathSelectionPanel.java:34)
	at com.jboss.devstudio.core.installer.PathSelectionPanel$1.insertUpdate(PathSelectionPanel.java:101)
	at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:202)
	at javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:749)
	at javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:708)
	at javax.swing.text.PlainDocument.insertString(PlainDocument.java:130)
	at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:670)
	at javax.swing.text.JTextComponent.setText(JTextComponent.java:1718)
	at com.jboss.devstudio.core.installer.PathSelectionPanel.setPath(PathSelectionPanel.java:202)
	at com.jboss.devstudio.core.installer.JREPathPanel.updateJava(JREPathPanel.java:287)
	at com.jboss.devstudio.core.installer.JREPathPanel.panelActivate(JREPathPanel.java:273)
	at com.izforge.izpack.installer.InstallerFrame.switchPanel(InstallerFrame.java:864)
	at com.izforge.izpack.installer.InstallerFrame.navigateNext(InstallerFrame.java:1475)
	at com.izforge.izpack.installer.InstallerFrame.navigateNext(InstallerFrame.java:1443)
	at com.izforge.izpack.installer.InstallerFrame$NavigationHandler.actionPerformed(InstallerFrame.java:1585)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6516)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
	at java.awt.Component.processEvent(Component.java:6281)
	at java.awt.Container.processEvent(Container.java:2229)
	at java.awt.Component.dispatchEventImpl(Component.java:4872)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4698)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
	at java.awt.Container.dispatchEventImpl(Container.java:2273)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	at java.awt.Component.dispatchEvent(Component.java:4698)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:694)
	at java.awt.EventQueue$3.run(EventQueue.java:692)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.awt.EventQueue$4.run(EventQueue.java:708)
	at java.awt.EventQueue$4.run(EventQueue.java:706)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)