How do I get doc window for completion menu with nvim-jdtls.

[231tr0n]

Hi and thank you for this wonderful plugin. It works like a charm for me at my work. I only had one issue with it. I am not able to get the completion menu docs as well with it like i do for other languages. I use mini.completion plugin.

In lua I get it but this only happens with jdtls. What do you think am I getting wrong.

Below is my configuration for nvim-jdtls

                                Global = {}
                                Global.capabilities = vim.lsp.make_client_capabilities()
	                        Global.lspCapabilities.textDocument.completion.completionItem.snippetSupport = true
				require("jdtls").start_or_attach((function()
					local config = {
						cmd = { "/usr/bin/jdtls" },
						root_dir = require("jdtls.setup").find_root({ ".git", "mvnw", "gradlew" }),
						settings = {
							java = {
								references = {
									includeDecompiledSources = true,
								},
								eclipse = {
									downloadSources = true,
								},
								maven = {
									downloadSources = true,
								},
								format = {
									enabled = true,
								},
								inlayHints = {
									parameterNames = {
										enabled = "all",
										exclusions = { "this" },
									},
								},
								signatureHelp = { enabled = true },
								contentProvider = { preferred = "fernflower" },
								codeGeneration = {
									toString = {
										template = "${object.className}{${member.name()}=${member.value}, ${otherMembers}}",
									},
									useBlocks = true,
								},
								configuration = {
									runtimes = {
										{
											name = "JavaSE-11",
											path = "/usr/lib/jvm/java-1.11.0-openjdk-amd64/",
										},
										{
											name = "JavaSE-17",
											path = "/usr/lib/jvm/java-1.17.0-openjdk-amd64/",
										},
										{
											name = "JavaSE-21",
											path = "/usr/lib/jvm/java-1.21.0-openjdk-amd64/",
										},
									},
								},
							},
						},
						capabilities = Global.lspCapabilities,
					}
					local bundles = {
						vim.fn.glob("/usr/share/java-debug/com.microsoft.java.debug.plugin.jar", true),
					}
					vim.list_extend(bundles, vim.split(vim.fn.glob("/usr/share/java-test/*.jar", true), "\n"))
					local extendedClientCapabilities = require("jdtls").extendedClientCapabilities
					extendedClientCapabilities.resolveAdditionalTextEditsSupport = true
					config["init_options"] = {
						bundles = bundles,
						extendedClientCapabilities = extendedClientCapabilities,
					}
					return config
				end)())

[mikehaertl]

@231tr0n It works for me with this slightly different signatureHelp config:

  settings = {
    java = {
      signatureHelp = {
        description = { enabled = true },
      },

Check here for a full list of available config options:
https://github.com/eclipse-jdtls/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request

[231tr0n]

					require("jdtls").start_or_attach((function()
						local config = {
							cmd = { "/usr/bin/jdtls" },
							root_dir = require("jdtls.setup").find_root({ ".git", "mvnw", "gradlew" }),
							settings = {
								java = {
									references = {
										includeDecompiledSources = true,
									},
									eclipse = {
										downloadSources = true,
									},
									maven = {
										downloadSources = true,
									},
									format = {
										enabled = true,
									},
									inlayHints = {
										parameterNames = {
											enabled = "all",
											exclusions = { "this" },
										},
									},
									signatureHelp = { enabled = true, description = { enabled = true } },
									contentProvider = { preferred = "fernflower" },
									codeGeneration = {
										toString = {
											template = "${object.className}{${member.name()}=${member.value}, ${otherMembers}}",
										},
										useBlocks = true,
									},
									configuration = {
										runtimes = {
											{
												name = "JavaSE-11",
												path = "/usr/lib/jvm/java-1.11.0-openjdk-amd64/",
											},
											{
												name = "JavaSE-17",
												path = "/usr/lib/jvm/java-1.17.0-openjdk-amd64/",
											},
											{
												name = "JavaSE-21",
												path = "/usr/lib/jvm/java-1.21.0-openjdk-amd64/",
											},
										},
									},
								},
							},
							capabilities = Global.lspCapabilities,
						}
						local bundles = {
							vim.fn.glob("/usr/share/java-debug/com.microsoft.java.debug.plugin.jar", true),
						}
						vim.list_extend(bundles, vim.split(vim.fn.glob("/usr/share/java-test/*.jar", true), "\n"))
						local extendedClientCapabilities = require("jdtls").extendedClientCapabilities
						extendedClientCapabilities.resolveAdditionalTextEditsSupport = true
						config["init_options"] = {
							bundles = bundles,
							extendedClientCapabilities = extendedClientCapabilities,
						}
						return config
					end)())

This is the configuration I am currently using. Am i doing something wrong here?

[mikehaertl]

Could be related to missing capabilities (i.e. what nvim reports to the LSP server about what features it supports).

I use nvim-cmp (and also lsp-file-operations plugin) which both extend nvims default capabilities. Therefore I build my config.capabilities like this:

  -- Inject nvim-cmp capabilities, e.g. to support snippets provided by jdtls
  capabilities = vim.tbl_deep_extend(
    "force",
    vim.lsp.protocol.make_client_capabilities(),
    require'cmp_nvim_lsp'.default_capabilities(),
    require'lsp-file-operations'.default_capabilities()
  ),

Just checked but it seems mini.completion doesn't provide anything like this. But maybe you want to give nvim-cmp a try. Descriptions work fine there for me.

[mikehaertl]

Here's what require'cmp_nvim_lsp'.default_capabilities() returns. Maybe you can try to add different options to your capabilities. labelDetailsSupport sound like a good candidate:

The client has support for completion item label details (see also CompletionItemLabelDetails).

{
  textDocument = {
    completion = {
      completionItem = {
        commitCharactersSupport = true,
        deprecatedSupport = true,
        insertReplaceSupport = true,
        insertTextModeSupport = {
          valueSet = { 1, 2 }
        },
        labelDetailsSupport = true,
        preselectSupport = true,
        resolveSupport = {
          properties = { "documentation", "detail", "additionalTextEdits", "sortText", "filterText", "insertText", "textEdit", "insertTextFormat", "insertTextMode" }
        },
        snippetSupport = true,
        tagSupport = {
          valueSet = { 1 }
        }
      },
      completionList = {
        itemDefaults = { "commitCharacters", "editRange", "insertTextFormat", "insertTextMode", "data" }
      },
      contextSupport = true,
      dynamicRegistration = false,
      insertTextMode = 1
    }
  }
}

[231tr0n]

Cool will try enabling the capabilities manually, currently my capabilities are just these.

		Global.lspCapabilities = vim.lsp.protocol.make_client_capabilities(),

[231tr0n]

Yup seems to work if I set this explictly.

	Global.lspCapabilities.textDocument.completion.completionItem.resolveSupport.properties = {
		"documentation",
		"detail",
		"additionalTextEdits",
		"sortText",
		"filterText",
		"insertText",
		"textEdit",
		"insertTextFormat",
		"insertTextMode",
	}

Thank you soo much for helping me out.