How to prevent my ToolWindow from been Garbage collected?

I'm new to IntelliJ platform.
I am writing a plugin with a ToolWindow.

When I run my plugin the ToolWindow shows correctly, but it will got GCed and disappear, then the `finalize()` method was called.

```kotlion
class MyToolWindowFactory: ToolWindowFactory, DumbAware {
    override fun createToolWindowContent(project: Project, toolWindow: ToolWindow) {
        val w = MyPanel(toolWindow)
        val contentFactory = ContentFactory.SERVICE.getInstance()
        val content = contentFactory.createContent(w, "", false)
        toolWindow.contentManager.addContent(content)
    }
}

class MyPanel(tw: ToolWindow) : SimpleToolWindowPanel(true, false) {
    private val panel= OnePixelSplitter(false,"My.DetailComponentSplitter", 0.3f)
    private val list = ProblemListView()
    private val detail = ProblemDetailView()
    init {
        panel.firstComponent = list.getComponent()
        panel.secondComponent = detail.getComponent()
        setContent(panel)
    }

    fun finalize() {
        print("")
    }
}
```

5 comments
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Xpol Wan,

Can you try with removing the DumbAware from your MyToolWindowFactory and check if the problem still occures?

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Thanks for replay!

Remove the DumbAware still got GCed.

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Can I ask you to provide more details regarding your IDE/OS versions?

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IntelliJ IDEA 2020.1.2 (Community Edition)
Build #IC-201.7846.76, built on June 1, 2020
Runtime version: 11.0.7+10-b765.53 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
macOS 10.15.5
GC: G1 Young Generation, G1 Old Generation
Memory: 512M
Cores: 8

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A similar issue has been reported in our YouTrack. You can follow it here.

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