When a wrong JAR file is selected (one that does not contain chosen JDBC driver) then the install throws NPE and hangs - either when doing Test JDBC Connection or when continuing with next steps.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:190)
	at com.redhat.installer.util.JDBCConnectionUtils.findDriverClass(JDBCConnectionUtils.java:156)
	at com.redhat.installer.panels.JBossJDBCDriverSetupPanel$JDBCPanel.verifyDriver(JBossJDBCDriverSetupPanel.java:506)
	at com.redhat.installer.panels.JBossJDBCDriverSetupPanelFSW$JDBCPanelFSW.testJDBCConnection(JBossJDBCDriverSetupPanelFSW.java:190)
	at com.redhat.installer.panels.JBossJDBCDriverSetupPanelFSW$JDBCPanelFSW$1.actionPerformed(JBossJDBCDriverSetupPanelFSW.java:119)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
	at javax.swing.AbstractButton$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:6505)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
	at java.awt.Component.processEvent(Component.java:6270)
	at java.awt.Container.processEvent(Container.java:2229)
	at java.awt.Component.dispatchEventImpl(Component.java:4861)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	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:4687)
	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)

Exception in thread "Thread-10" java.lang.NullPointerException
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:190)
	at com.redhat.installer.util.JDBCConnectionUtils.findDriverClass(JDBCConnectionUtils.java:156)
	at com.redhat.installer.panels.JBossJDBCDriverSetupPanel$JDBCPanel.verifyDriver(JBossJDBCDriverSetupPanel.java:506)
	at com.redhat.installer.panels.JBossJDBCDriverSetupPanel$JDBCPanel.validated(JBossJDBCDriverSetupPanel.java:438)
	at com.redhat.installer.panels.JBossJDBCDriverSetupPanelFSW$JDBCPanelFSW.validated(JBossJDBCDriverSetupPanelFSW.java:162)
	at com.redhat.installer.panels.JBossJDBCDriverSetupPanel.isValidated(JBossJDBCDriverSetupPanel.java:85)
	at com.izforge.izpack.installer.IzPanel.panelValidated(IzPanel.java:434)
	at com.izforge.izpack.installer.InstallerFrame.navigateNext(InstallerFrame.java:1664)
	at com.izforge.izpack.installer.InstallerFrame.navigateNext(InstallerFrame.java:1649)
	at com.izforge.izpack.installer.InstallerFrame$NavigationHandler.navigate(InstallerFrame.java:1812)
	at com.izforge.izpack.installer.InstallerFrame$NavigationHandler.access$100(InstallerFrame.java:1779)
	at com.izforge.izpack.installer.InstallerFrame$NavigationHandler$1.run(InstallerFrame.java:1796)
	at java.lang.Thread.run(Thread.java:724)