Some questions about the debug adapter protocol

[EricCD-S]

i am trying to realize debug function via --dap, i start "graalpy --dap test.py" in a subprocess and communicate by socket, but i can not set breakpoints. I follow the message order "initialize setbreakpoints configurationDone launch (or attach, i tried different requests)....". I do recieve response for each request, but breakpoints are always "verified: false", i can not get variablies i want and "continue" request ends with the results of my program, it always generates an error message at the same time. If there is a more detailed and specific tutorial than the one in the official document? I can figure out what's wrong with my code. thanks.

[entlicher]

Are you writing the debugger communication via DAP yourself? You can use Visual Studio Code to test the functionality.
Our launchers can provide logging of the DAP communication for verification. You can turn logging on via:

--log.dap.level=FINEST

When debugging with Visual Studio Code, we get a request:

Received request 'setBreakpoints - (2)'
Args: {"source":{"path":"/tmp/VSC_Work/JS_Completion.js","name":"JS_Completion.js"},"breakpoints":[{"line":6}],"lines":[6],"sourceModified":false}

and we reply with:

Result: {"breakpoints":[{"line":6,"verified":false,"id":1}]}

After the execution starts and the given source file is loaded:

Sending event 'loadedSource'
Body: {"reason":"new","source":{"path":"/tmp/VSC_Work/JS_Completion.js","name":"JS_Completion.js"}}

we also send update of the breakpoint:

Sending event 'breakpoint'
Body: {"reason":"changed","breakpoint":{"endLine":6,"endColumn":15,"line":6,"verified":true,"column":1,"id":1}}

If a problem persists, provide the communication log and exact steps please.

[EricCD-S]

Here are my requests and responses, i still can not receive "changed" response，do i miss something?

1.{"arguments:{"adapterID":"python","clientID":"debugger","clientName":"debugger","columnsStartAt1":true,"linesStartAt1":true,"pathFormat":"path"},"command":"initialize","seq":0,"type":"request"}

{"success":true,"type":"response","body":{"supportsConditionalBreakpoints":true,"supportsLoadedSourcesRequest":true,"supportsFunctionBreakpoints":true,"supportsExceptionInfoRequest":true,"supportsBreakpointLocationsRequest":true,"supportsHitConditionalBreakpoints":true,"supportsLogPoints":true,"supportsSetVariable":true,"supportsConfigurationDoneRequest":true,"exceptionBreakpointFilters":[{"filter":"all","label":"All Exceptions"},{"filter":"uncaught","label":"Uncaught Exceptions"}]},"request_seq":0,"command":"initialize","seq":1}

{"event":"initialized","type":"event","seq":2}

2.{"arguments":{"port":4711,"protocol":"debugAdapter"},"command":"attach","seq":1,"type":"request"}

{"event":"output","body":{"output":"Debugger attached.","category":"stderr"},"type":"event","seq":3}
[dap] FINER: [Trace - 2025-04-02T07:53:44.731500100Z] Sending response '(1)'Result: null
{"success":true,"type":"response","request_seq":1,"command":"attach","seq":4}

3.{"arguments":{"breakpoints":[{"line":5},{"line":10}],"lines":[5,10],"source":{"name":"test.py","path":"C:/Users/user/Desktop/test/test.py"},"sourceModified":false},"command":"setBreakpoints","seq":2,"type":"request"}

[dap] FINER: [Trace - 2025-04-02T07:55:37.868401900Z] Received request 'setBreakpoints - (2)'Args: {"breakpoints":[{"line":5},{"line":10}],"source":{"path":"C:/Users/user/Desktop/test/test.py","name":"test.py"},"lines":[5,10],"sourceModified":false}
[dap] FINER: [Trace - 2025-04-02T07:55:37.868401900Z] Sending response '(2)'Result: {"breakpoints":[{"line":5,"verified":false,"id":1},{"line":10,"verified":false,"id":2}]}

{"success":true,"body":{"breakpoints":[{"line":5,"verified":false,"id":1},{"line":10,"verified":false,"id":2}]},"type":"response","request_seq":2,"command":"setBreakpoints","seq":5}

4.{"command":"configurationDone","seq":3,"type":"request"}

{"success":true,"type":"response","request_seq":3,"command":"configurationDone","seq":6}

[dap] FINER: [Trace - 2025-04-02T07:57:25.718350800Z] Sending event 'loadedSource'
Body: {"reason":"new","source":{"path":"D:\Java\graalpy-24.2.0-windows-amd64\Lib\copyreg.py","name":""}}

{"event":"loadedSource","body":{"reason":"new","source":{"path":"D:\Java\graalpy-24.2.0-windows-amd64\Lib\copyreg.py","name":""}},"type":"event","seq":7}

[dap] FINER: [Trace - 2025-04-02T07:57:25.728703600Z] Sending event 'loadedSource'
Body: {"reason":"new","source":{"sourceReference":26,"name":""}}

{"event":"loadedSource","body":{"reason":"new","source":{"sourceReference":26,"name":""}},"type":"event","seq":8}

[dap] FINER: [Trace - 2025-04-02T07:57:25.765660600Z] Sending event 'loadedSource'Body: {"reason":"new","source":{"path":"D:\Java\graalpy-24.2.0-windows-amd64\Lib\site-packages\_distutils_hack\init.py","name":""}}

{"event":"loadedSource","body":{"reason":"new","source":{"path":"D:\Java\graalpy-24.2.0-windows-amd64\Lib\site-packages\_distutils_hack\init.py","name":""}},"type":"event","seq":9}

[dap] FINER: [Trace - 2025-04-02T07:57:25.802136400Z] Sending event 'loadedSource'Body: {"reason":"new","source":{"path":"C:\Users\user\Desktop\test\test.py","name":"test.py"}}

{"event":"loadedSource","body":{"reason":"new","source":{"path":"C:\Users\dzq\Desktop\test\test.py","name":"test.py"}},"type":"event","seq":10}[dap] FINER: [Trace - 2025-04-02T07:57:25.805206900Z] Sending event 'stopped'
Body: {"threadId":1,"reason":"debugger_statement","description":"Paused on debugger statement"}

{"event":"stopped","body":{"threadId":1,"reason":"debugger_statement","description":"Paused on debugger statement"},"type":"event","seq":11}