Help needed: Can't find documentation to configure Java Attach to Process Debug  #340

Activity

1. me-heer

   added

   bugSomething isn't workingSomething isn't working

   on Jan 6, 2025
2. s1n7ax commented on Jan 7, 2025

   

   s1n7ax

   on Jan 7, 2025

   Member

   More actions

   This is automatically configured when you open a Java file. If you want custom configuration then you have to use dap APIs to do so. It's not in the scope of this project.

   👎React with 👎1Reacted by Luis Calle
3. s1n7ax commented on Jan 7, 2025

   

   s1n7ax

   on Jan 7, 2025

   Member

   More actions

   If what you are trying to say is that debug is not working out of the box, then i could look into it
4. me-heer commented on Jan 7, 2025

   

   me-heer

   on Jan 7, 2025

   Author

   More actions

   If attach to process configuration is automatically configured, how do I invoke it?

   :DapContinue only shows classes which have main method in them, and there's no debug configuration of attaching to a process

   👍React with 👍1Reacted by Thomas Fehér
5. TheLeoP commented on Jan 8, 2025

   

   TheLeoP

   on Jan 8, 2025

   Last edited by TheLeoP

   Contributor

   More actions

   This is automatically configured when you open a Java file. If you want custom configuration then you have to use dap APIs to do so. It's not in the scope of this project.

   The problem is that this plugin is overriding completely require'dap'.configurations.java on LspAttach, so it doens't matter if users are creating custom configurations, this plugin overrides them.

   To fix this, instead of setting require'dap'.configurations.java directly

   nvim-java/lua/java/dap/init.lua

   Line 108 in e8e8441

   nvim_dap.configurations.java = dap_config

   a better approach would be to

   local dap = require'dap'
   dap.configurations.java = dap.configurations.java or {} -- define the array of configurations only if not previously defined
   
   -- do this in a for loop for each discovered configuration
   table.insert(dap.configurations.java, {
   -- some discovered configuration
   })

   👍React with 👍1Reacted by Mihir Joshi
6. s1n7ax commented on Jan 8, 2025

   

   s1n7ax

   on Jan 8, 2025

   Member

   More actions

   I would happily accept this PR

   👍React with 👍1Reacted by Luis Calle
7. s1n7ax

   closed this as completedin #342on Jan 10, 2025
8. me-heer commented on Jan 10, 2025

   

   me-heer

   on Jan 10, 2025

   Last edited by me-heer

   Author

   More actions

   Thanks for the help.

   I have updated the plugin, and now my custom configuration (Attach to process) shows up in the :DapContinue options.

   However, when I execute it, I get the following error:

   Error executing vim.schedule lua callback: ...e/nvim/lazy/nvim-java-core/lua/java-core/utils/async.lua:41: unhandled error ...share/nvim/lazy
   /nvim-java-dap/lua/java-dap/api/setup.lua:50: To enrich the config, mainClass should already be present
   stack traceback:
           [C]: in function 'error'
           ...e/nvim/lazy/nvim-java-core/lua/java-core/utils/async.lua:41: in function 'callback'
           ...nvim-java-core/lua/java-core/ls/clients/jdtls-client.lua:72: in function 'handler'
           .../neovim/0.10.3/share/nvim/runtime/lua/vim/lsp/client.lua:687: in function ''
           vim/_editor.lua: in function <vim/_editor.lua:0>
   

   I have gone through the Trobleshooting section and applied this: https://github.com/nvim-java/nvim-java/wiki/Troubleshooting#no_entry-to-enrich-the-config-xxx-should-already-be-present

   My configuration for reference: https://github.com/me-heer/nvim/blob/master/init.lua#L1056-L1065
9. TheLeoP commented on Jan 10, 2025

   

   TheLeoP

   on Jan 10, 2025

   Contributor

   More actions

   nvim-jdtls (the other java plugin for nvim from the same creator of nvim-dap) seems to discover the main clases during enrich_dap_config instead of before, like nvim-java (which is throwing an error because it expects those fields to be there). I don't know enough about how the java debug adapter works to help here, but nvim-jdtls has always worked for me, so I guess nvim-java-dap has to be modified to do the discovering of main classes later (?)
10. me-heer commented on Jan 10, 2025

    

    me-heer

    on Jan 10, 2025

    Author

    More actions

    I don't know if this helps, but the directory I am opening has multiple Java projects in the subdirectories.

    Also, I don't understand why there needs to be a main class (or class with a main method) altogether since I am going to use "Attach to Debug" in a Spring MVC project where there's no custom class with a main method.
11. agraven commented on Jun 16, 2025

    

    agraven

    on Jun 16, 2025

    More actions

    As a workaround adding the mainClass field to the debug configuration by hand will resolve this. The value should be the fully qualified reference to the main class, e.g. com.organization.foo.FooApplication.
12. me-heer commented on Jun 18, 2025

    

    me-heer

    on Jun 18, 2025

    Author

    More actions

    Thanks for the suggestion, I appreaciate it. I use Spring MVC, so there's no main class, rather it's deployed on a web server like Tomcat and then we "Attach" to Debug