尝试卸载NetBeans 12.0时出现NullPointerException

我正在尝试卸载NetBeans 12.0，但向导在启动时引发以下异常：

日志上说：

[2020-08-11 14:03:20.249]:     initializing product registry properties
[2020-08-11 14:03:20.249]:     exiting -- org.netbeans.installer.product.Registry.initializeRegistry():170
[2020-08-11 14:03:20.253]:     ... loading registry from file:/C:/Users/Kai/.nbi/registry.xml
[2020-08-11 14:03:20.311]:     entering -- org.netbeans.installer.product.Registry.loadProductRegistry():981
[2020-08-11 14:03:20.312]:     validating previous installations
[2020-08-11 14:03:20.378]:         NameResolver - to parse C:\Program Files\NetBeans 8.2
[2020-08-11 14:03:20.392]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.396]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.404]:         NameResolver - to parse C:\Program Files\NetBeans 8.2\bin\jre
[2020-08-11 14:03:20.407]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.410]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.414]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.417]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.424]:         NameResolver - to parse C:\Program Files\NetBeans 8.2
[2020-08-11 14:03:20.425]:     ... validating installations finished
[2020-08-11 14:03:20.425]:     exiting -- org.netbeans.installer.product.Registry.loadProductRegistry():981
[2020-08-11 14:03:20.425]:     ... loading registry from resource:data/registry.xml
[2020-08-11 14:03:20.434]:     entering -- org.netbeans.installer.product.Registry.loadProductRegistry():981
[2020-08-11 14:03:20.434]:     validating previous installations
[2020-08-11 14:03:20.434]:         NameResolver - to parse C:\Program Files\NetBeans 8.2
[2020-08-11 14:03:20.435]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.437]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.437]:         NameResolver - to parse C:\Program Files\NetBeans 8.2\bin\jre
[2020-08-11 14:03:20.438]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.439]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.440]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.441]:         NameResolver - to parse C:\Program Files\NetBeans-12.0
[2020-08-11 14:03:20.442]:         NameResolver - to parse C:\Program Files\NetBeans 8.2
[2020-08-11 14:03:20.443]:     ... validating installations finished
[2020-08-11 14:03:20.443]:     exiting -- org.netbeans.installer.product.Registry.loadProductRegistry():981
[2020-08-11 14:03:20.447]:     An unexpected exception happened in thread Thread-2
[2020-08-11 14:03:20.448]:     java.lang.NullPointerException
[2020-08-11 14:03:20.448]:      at org.netbeans.installer.utils.helper.Version.equals(Version.java:69)
[2020-08-11 14:03:20.448]:      at org.netbeans.installer.product.Registry.changeStatuses(Registry.java:600)
[2020-08-11 14:03:20.448]:      at org.netbeans.installer.product.Registry.initializeRegistry(Registry.java:184)
[2020-08-11 14:03:20.448]:      at org.netbeans.installer.wizard.components.actions.InitializeRegistryAction.execute(InitializeRegistryAction.java:53)
[2020-08-11 14:03:20.448]:      at org.netbeans.installer.wizard.components.actions.netbeans.NbInitializationAction.execute(NbInitializationAction.java:69)
[2020-08-11 14:03:20.448]:      at org.netbeans.installer.wizard.components.WizardAction$1.run(WizardAction.java:103)
[2020-08-11 14:03:20.448]:     ... show message dialog
[2020-08-11 14:03:20.448]:         title: Critical Error
[2020-08-11 14:03:20.448]:         message: An unexpected exception happened in thread Thread-2
[2020-08-11 14:03:20.449]:         
[2020-08-11 14:03:20.449]:         Exception:
[2020-08-11 14:03:20.449]:           java.lang.NullPointerException:
[2020-08-11 14:03:20.449]:           null
[2020-08-11 14:03:20.449]:         
[2020-08-11 14:03:20.449]:         You can get more details about the issue in the installer log file:
[2020-08-11 14:03:20.449]:          C:\Users\Kai\.nbi\log\20200811140318.log
[2020-08-11 14:03:27.074]:     ... dialog closed

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有人知道如何修复此错误或使用其他方法卸载NetBeans 12.0吗？

经过一些尝试和错误后，以下方法对我有效：

• 进入您的用户目录（C:\Users\YourUsername\）并找到其中的.nbi目录
• 删除.nbi目录（或将其移动到其他位置）
• 运行NetBeans 12.0卸载程序

在此之后，卸载向导找不到NetBeans 12.0的注册表项，并停止了卸载过程。为了解决这个问题，我做了以下工作：

• 删除您的Netbeans 12.0目录（C:\Programs\Netbeans 12.0\）
• 使用安装向导再次安装NetBeans 12.0
• 通过Windows 10设置卸载NetBeans 12.0

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最后，我能够卸载NetBeans 12.0，没有任何空指针异常。

[1]安装NB12.0时使用的是什么版本的Java，卸载时使用的是什么版本？[2] 不幸的是，由于您删除了.nbi目录，现在进行进一步研究为时已晚，但日志中明确说明了实现此目的的适当方法：

您可以在安装程序日志文件[2020-08-11 14:03:20.449]：C:\Users\Kai\.nbi\log\20200811140318.log

[1]中获得有关此问题的更多详细信息我使用开放JDK11进行开发。[2] 我在这篇文章中发布了日志文件的相关部分，但我不知道问题出在哪里。