Enable plugin loading/unloading without restart

[duemir]

Dependencies

Feature Request

According to https://plugins.jetbrains.com/plugin/1885-stapler-framework-support/versions following is what is blocking it:

Plugin Stapler Framework Support 2.0.0 cannot be enabled nor disabled without IDE restart because the following requirements are not satisfied: Plugin cannot be loaded/unloaded without IDE restart because it declares non-dynamic extensions: com.intellij.fileTypeFactory

[duemir]

It requires a newer IntelliJ baseline. com.intellij.fileTypeFactory was deprecated in 2019.2.

[duemir]

Registering a File Type | IntelliJ Platform Plugin SDK

[jgreffe]

Hello @duemir ,

with last master, I tried following this: https://plugins.jetbrains.com/docs/intellij/dynamic-plugins.html#restrictions

But IDEA states nothing to report (?)

And running locally:

$ gradle runPluginVerifier -PideaVersion=2022.2.3
...
Plugin Stapler plugin for IntelliJ IDEA:2.1.0 against IC-222.4345.14: Compatible
    Plugin can probably be enabled or disabled without IDE restart

Plugin Stapler plugin for IntelliJ IDEA:2.1.0 against IC-223.6160.11: Compatible
    Plugin can probably be enabled or disabled without IDE restart
...

But it seems it's still not dynamic, as when installed, trying to uninstall -> requires IDE restart :/

[duemir]

Check https://plugins.jetbrains.com/docs/intellij/dynamic-plugins.html#code

Do not store references to PSI elements in objects which can survive plugin loading or unloading; use SmartPsiElementPointer instead.

A bunch of XmlTag-s and XmlAttributes are stored around directly, I believe. Something to look into as far as this feature goes.

[duemir]

I don't know how much of a clue it is, but when I updated the plugin in IntelliJ Community Edition, dynamic reload worked.

[jgreffe]

I'm my side, can't make it reload dynamically :/
In a terminal:

$ gradle runIde -PrunIde.jvmArgs+="-XX:+UnlockDiagnosticVMOptions" -PideaVersion=2022.1

In the opened sandbox:

• change Registry... configuration with ide.plugins.snapshot.on.unload.fail to true
• open a jelly file

In another terminal:

$ gradle buildPlugin -xbuildSearchableOptions

Switch focus back to sandbox:

• plugin will try to reload dynamically
• a popin will show stating dynamic reload failed
• look at build/idea-sandbox/system/log/idea.log:

2022-11-07 08:41:28,176 [  44771]   INFO - #c.i.i.p.DynamicPlugins - Snapshot analysis result: Root 1:
  ROOT: Global JNI
  com.intellij.openapi.wm.impl.IdeFrameImpl.myFrameHelper
  com.intellij.openapi.wm.impl.ProjectFrameHelper$1.this$0
  com.intellij.openapi.wm.impl.ProjectFrameHelper.project
  com.intellij.openapi.project.impl.ProjectExImpl.componentKeyToAdapter
  java.util.concurrent.ConcurrentHashMap.table
  java.util.concurrent.ConcurrentHashMap$Node[]
  java.util.concurrent.ConcurrentHashMap$Node.val
  com.intellij.serviceContainer.ServiceComponentAdapter.initializedInstance
  com.intellij.ide.structureView.impl.StructureViewFactoryImpl.myImplExtensions
  java.util.concurrent.ConcurrentHashMap.table
  java.util.concurrent.ConcurrentHashMap$Node[]
  java.util.concurrent.ConcurrentHashMap$Node.key
  org.kohsuke.stapler.idea.psi.JellyFileImpl.<loader>
* com.intellij.ide.plugins.cl.PluginClassLoader


2022-11-07 08:41:28,213 [  44808]   INFO - #c.i.i.p.DynamicPlugins - Plugin Stapler plugin for IntelliJ IDEA is not unload-safe because class loader cannot be unloaded. Memory snapshot created at /Users/xxx/unload-Stapler plugin for IntelliJ IDEA-07.11.2022_08.41.21.hprof

[duemir]

That looks like the new PSI class that you introduced, which appears to be used as a key in the map somewhere inside IntelliJ.
Other than asking in Jetbrains Slack and reporting to their YouTrack if that's what they suggest on Slack, I have no ideas.

To be honest this is nice to have category in my head, so I personally would not be spending much time on this.

[jgreffe]

Same issue with standard simple language demo from JetBrains.
Created https://youtrack.jetbrains.com/issue/IDEA-305958/simplelanguageplugin-not-dynamic

[jgreffe]

Created issue is a duplicate of https://youtrack.jetbrains.com/issue/IDEA-263300 (unresolved yet)