堆栈内存溢出
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NPE使用GTK LAF运行Netbeans时

[英]NPE When running Netbeans using the GTK LAF

 原文  2011-09-26 13:06:52  8   1    java/ properties/ gtk/ look-and-feel

问题描述

Recently, I got a weird stack trace in the netbeans logs (I added it to the end of this post). 最近，我在netbeans日志中得到了一个奇怪的堆栈跟踪（我将其添加到了本文的结尾）。 I was able to track it down to the LAF. 我能够将其追踪到LAF。 This error happens, when running Netbeans using the GTK LAF, but works fine in Metal, and using the native Windows LAF. 当使用GTK LAF运行Netbeans时，会发生此错误，但在Metal和使用本机Windows LAF中可以正常工作。

It seems, that the PropertyChangeSupport instance is NULL, so it throws an error when adding a Property change listener. 似乎PropertyChangeSupport实例为NULL，因此添加属性更改侦听器时会引发错误。 Here's the abbreviated source of my custom component: 这是我的自定义组件的缩写来源： 

public class EnterprisePicker extends javax.swing.JPanel implements ActionListener, KeyListener, ListSelectionListener, UnitContainer {

    private static final Logger logger = IdeUiUtil.initLogger(EnterprisePicker.class.getName());
    protected InfoPanelStyle infoPanelStyle = InfoPanelStyle.FULL;
    private final PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
    public static final String PROP_INFOPANELSTYLE = "infoPanelStyle";

    /** Creates the new component */
    public EnterprisePicker() {
        // [... snip ...]
    }

    // [ ... snip ... ]

    /**
     * Add PropertyChangeListener.
     *
     * @param listener
     */
    @Override
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.addPropertyChangeListener(listener);
    }

    // [ ... snip ... ]

}

Obviously I could simply protect these calls using if (propertyChangeSupport == null) ... But would that not break properties later on in the application? 显然，我可以使用if (propertyChangeSupport == null)来保护这些调用。但是那不会在以后的应用程序中破坏属性吗？ Assuming that no listener will ever be attached as the instance is null ...? 假设实例为null假设没有侦听器将被附加……？

Stack Trace 堆栈跟踪 

INFO [org.netbeans.modules.form.BeanSupport]: Cannot create default instance of: org.statec.ide.ui.components.EnterprisePicker
java.lang.NullPointerException
        at org.statec.ide.ui.components.EnterprisePicker.addPropertyChangeListener(EnterprisePicker.java:654)
        at javax.swing.plaf.synth.SynthPanelUI.installListeners(SynthPanelUI.java:49)
        at javax.swing.plaf.synth.SynthPanelUI.installUI(SynthPanelUI.java:38)
        at javax.swing.JComponent.setUI(JComponent.java:662)
        at javax.swing.JPanel.setUI(JPanel.java:136)
        at javax.swing.JPanel.updateUI(JPanel.java:109)
        at javax.swing.JPanel.<init>(JPanel.java:69)
        at javax.swing.JPanel.<init>(JPanel.java:92)
        at javax.swing.JPanel.<init>(JPanel.java:100)
        at org.statec.ide.ui.components.EnterprisePicker.<init>(EnterprisePicker.java:39)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at java.lang.Class.newInstance0(Class.java:355)
        at java.lang.Class.newInstance(Class.java:308)
        at org.netbeans.modules.form.CreationFactory.createDefaultInstance(CreationFactory.java:168)
[catch] at org.netbeans.modules.form.BeanSupport.createBeanInstance(BeanSupport.java:83)
        at org.netbeans.modules.form.BeanSupport.getDefaultInstance(BeanSupport.java:109)
        at org.netbeans.modules.form.GandalfPersistenceManager.restoreComponent(GandalfPersistenceManager.java:769)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadComponent(GandalfPersistenceManager.java:1007)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:527)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:299)
        at org.netbeans.modules.form.FormEditor$3.run(FormEditor.java:337)
        at org.netbeans.modules.form.FormLAF$2.run(FormLAF.java:293)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:1361)
        at org.openide.util.Mutex.readAccess(Mutex.java:320)
        at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:276)
        at org.netbeans.modules.form.FormEditor.loadFormData(FormEditor.java:334)
        at org.netbeans.modules.form.FormEditor.loadFormDesigner(FormEditor.java:232)
        at org.netbeans.modules.form.FormDesigner.finishComponentShowing(FormDesigner.java:1932)
        at org.netbeans.modules.form.FormDesigner.access$1100(FormDesigner.java:107)
        at org.netbeans.modules.form.FormDesigner$PreLoadTask$1.run(FormDesigner.java:1897)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
        at java.awt.EventQueue.access$000(EventQueue.java:84)
        at java.awt.EventQueue$1.run(EventQueue.java:602)
        at java.awt.EventQueue$1.run(EventQueue.java:600)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
INFO
org.openide.ErrorManager$AnnException: msg
        at org.openide.ErrorManager$AnnException.findOrCreate(ErrorManager.java:866)
        at org.openide.ErrorManager$DelegatingErrorManager.annotate(ErrorManager.java:653)
        at org.netbeans.modules.form.GandalfPersistenceManager.annotateException(GandalfPersistenceManager.java:237)
        at org.netbeans.modules.form.GandalfPersistenceManager.annotateException(GandalfPersistenceManager.java:247)
        at org.netbeans.modules.form.GandalfPersistenceManager.restoreComponent(GandalfPersistenceManager.java:865)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadComponent(GandalfPersistenceManager.java:1007)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:527)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:299)
        at org.netbeans.modules.form.FormEditor$3.run(FormEditor.java:337)
        at org.netbeans.modules.form.FormLAF$2.run(FormLAF.java:293)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:1361)
        at org.openide.util.Mutex.readAccess(Mutex.java:320)
        at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:276)
        at org.netbeans.modules.form.FormEditor.loadFormData(FormEditor.java:334)
        at org.netbeans.modules.form.FormEditor.loadFormDesigner(FormEditor.java:232)
        at org.netbeans.modules.form.FormDesigner.finishComponentShowing(FormDesigner.java:1932)
        at org.netbeans.modules.form.FormDesigner.access$1100(FormDesigner.java:107)
        at org.netbeans.modules.form.FormDesigner$PreLoadTask$1.run(FormDesigner.java:1897)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
        at java.awt.EventQueue.access$000(EventQueue.java:84)
        at java.awt.EventQueue$1.run(EventQueue.java:602)
        at java.awt.EventQueue$1.run(EventQueue.java:600)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
msg
Caused: java.lang.NullPointerException
        at org.statec.ide.ui.components.EnterprisePicker.addPropertyChangeListener(EnterprisePicker.java:654)
        at javax.swing.plaf.synth.SynthPanelUI.installListeners(SynthPanelUI.java:49)
        at javax.swing.plaf.synth.SynthPanelUI.installUI(SynthPanelUI.java:38)
        at javax.swing.JComponent.setUI(JComponent.java:662)
        at javax.swing.JPanel.setUI(JPanel.java:136)
        at javax.swing.JPanel.updateUI(JPanel.java:109)
        at javax.swing.JPanel.<init>(JPanel.java:69)
        at javax.swing.JPanel.<init>(JPanel.java:92)
        at javax.swing.JPanel.<init>(JPanel.java:100)
        at org.statec.ide.ui.components.EnterprisePicker.<init>(EnterprisePicker.java:39)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at java.lang.Class.newInstance0(Class.java:355)
        at java.lang.Class.newInstance(Class.java:308)
        at org.netbeans.modules.form.CreationFactory.createDefaultInstance(CreationFactory.java:168)
        at org.netbeans.modules.form.RADComponent.createBeanInstance(RADComponent.java:252)
        at org.netbeans.modules.form.RADComponent.initInstance(RADComponent.java:191)
        at org.netbeans.modules.form.GandalfPersistenceManager.restoreComponent(GandalfPersistenceManager.java:851)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadComponent(GandalfPersistenceManager.java:1007)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:527)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:299)
        at org.netbeans.modules.form.FormEditor$3.run(FormEditor.java:337)
        at org.netbeans.modules.form.FormLAF$2.run(FormLAF.java:293)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:1361)
        at org.openide.util.Mutex.readAccess(Mutex.java:320)
        at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:276)
        at org.netbeans.modules.form.FormEditor.loadFormData(FormEditor.java:334)
[catch] at org.netbeans.modules.form.FormEditor.loadFormDesigner(FormEditor.java:232)
        at org.netbeans.modules.form.FormDesigner.finishComponentShowing(FormDesigner.java:1932)
        at org.netbeans.modules.form.FormDesigner.access$1100(FormDesigner.java:107)
        at org.netbeans.modules.form.FormDesigner$PreLoadTask$1.run(FormDesigner.java:1897)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
        at java.awt.EventQueue.access$000(EventQueue.java:84)
        at java.awt.EventQueue$1.run(EventQueue.java:602)
        at java.awt.EventQueue$1.run(EventQueue.java:600)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Error in loading component: [JDialog]->enterprisePicker1
Cannot create instance of org.statec.ide.ui.components.EnterprisePicker.
The component cannot be loaded.

And for reference: 供参考： 

malbert@dredg:~/.netbeans/7.0/var/log$ java -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Server VM (build 20.1-b02, mixed mode)

malbert@dredg:~/.netbeans/7.0/var/log$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.04
DISTRIB_CODENAME=natty
DISTRIB_DESCRIPTION="Ubuntu 11.04"

1 个解决方案

解决方案1
 3 已采纳  2011-09-26 13:17:28

Just a guess, but the problem could be that during initialization of some super class addPropertyChangeListener(...) is called ( javax.swing.JPanel.<init> might be the culprit), thus this call happens before propertyChangeSupport is initialized. 只是一个猜测，但是问题可能是在某些超类的初始化期间调用了addPropertyChangeListener(...) （ javax.swing.JPanel.<init>可能是罪魁祸首），因此此调用发生在初始化propertyChangeSupport之前。

The initialization sequence of instance fields would be: 实例字段的初始化顺序为：

  • Object 宾语
  • Component 零件
  • Container 容器
  • JComponent 的JComponent
  • JPanel 的JPanel
  • EnterprisePicker EnterprisePicker

If during initialization of JPanel the addPropertyChangeListener(...) method is called, it would actually be the overridden version of EnterprisePicker , but EnterprisePicker 's fields would not have been initialized yet. 如果在JPanel初始化期间调用了addPropertyChangeListener(...)方法，则该方法实际上是EnterprisePicker的重写版本，但EnterprisePicker的字段尚未初始化。

To fix this you'd check for null in that method and initialize as needed (or call super.addPropertyChangeListener(...) . Is there any need to have your own implementation (to add your own PropertyChangeSupport )? 要解决此问题，您需要在该方法中检查是否为null并根据需要进行初始化（或调用super.addPropertyChangeListener(...) 。是否需要自己的实现（添加您自己的PropertyChangeSupport ）？

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