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It's the eclipse.jdt.ls project to handle the auto compilation, i suggest you have a look at the source code there. https://github.com/eclipse/eclipse.jdt.ls/blob/master/org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/DocumentLifeCycleHandler.java#L204

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modify -> textDocument/didChange
save -> textDocument/didSave

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textDocument/didSave does not seem to work .

I want to know how to implement classes that automatically compile changes？

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Thanks

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@gnegu, you need enable auto building for your work. Refer https://github.com/eclipse/eclipse.jdt.ls/blob/c0656fc1230be7f77202238cac61f1f6cd4b74a1/org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/managers/ProjectsManager.java for enable this value.

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I think , you said the settings

"autobuild": {
      "enabled": true
},

Actually , I set it to true, then I save a file does not appear to take effect.

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setting.json:

    "java.autobuild.enabled": true

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It seems that I am setting the right value for autobuild .

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https://github.com/eclipse/eclipse.jdt.ls/blob/v0.25.0/org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/InitHandler.java#L220

Looks like it was written to false stable.

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