I installed the r.xml mode file and then tested it by opening a file with .R extension. The syntax highlighting worked just fine, so I thought I did the installation correctly, but now I'm unable to close that file, exiting jedit and re-opening doesn't help, the file is still open. I get this error message:
java.lang.NullPointerException: Mode must be non-null
at org.gjt.sp.jedit.Buffer.setMode(Buffer.java:2016)
at org.gjt.sp.jedit.Buffer.setMode(Buffer.java:2066)
at org.gjt.sp.jedit.Buffer.finishLoading(Buffer.java:3920)
at org.gjt.sp.jedit.Buffer.access$800(Buffer.java:71)
at org.gjt.sp.jedit.Buffer$1.run(Buffer.java:280)
at org.gjt.sp.util.WorkThreadPool.addWorkRequest(WorkThreadPool.java:110)
at org.gjt.sp.jedit.io.VFSManager.runInAWTThread(VFSManager.java:261)
at org.gjt.sp.jedit.Buffer.load(Buffer.java:317)
at org.gjt.sp.jedit.jEdit.openFile(jEdit.java:1473)
at org.gjt.sp.jedit.jEdit.newFile(jEdit.java:1617)
at org.gjt.sp.jedit.jEdit.newFile(jEdit.java:1572)
at org.gjt.sp.jedit.jEdit._closeBuffer(jEdit.java:1717)
at org.gjt.sp.jedit.jEdit.closeBuffer(jEdit.java:1664)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at bsh.Reflect.invokeOnMethod(Reflect.java:149)
at bsh.Reflect.invokeStaticMethod(Reflect.java:100)
at bsh.Name.invokeMethod(Name.java:872)
at bsh.BSHMethodInvocation.eval(BSHMethodInvocation.java:72)
at bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:102)
at bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:47)
at bsh.BSHBlock.evalBlock(BSHBlock.java:130)
at bsh.BSHBlock.eval(BSHBlock.java:80)
at bsh.BshMethod.invokeImpl(BshMethod.java:349)
at bsh.BshMethod.invoke(BshMethod.java:246)
at bsh.BshMethod.invoke(BshMethod.java:171)
at org.gjt.sp.jedit.BeanShell.runCachedBlock(BeanShell.java:523)
at org.gjt.sp.jedit.BeanShellAction.invoke(BeanShellAction.java:76)
at org.gjt.sp.jedit.gui.InputHandler.invokeAction(InputHandler.java:229)
at org.gjt.sp.jedit.jEdit$3.invokeAction(jEdit.java:2910)
at org.gjt.sp.jedit.EditAction$Wrapper.actionPerformed(EditAction.java:216)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)