Setting up nvim-jdtls for a big java project.

[BodeaPeGitHub]

Hello, I'm working on a big java project and I try to set up my nvim-jdtls but I can't figure out why aren't my functions working. Whenever I try to use "go to definition" it gets me to the import and none of the functions really work.
I use the project in Eclipse and I want to make it usable in Neovim.

In Eclipse I don't load all the classes, I only use a few folders that are included in my build path, I tried to add them here too.

Other important details:

• I use Neovim in Windows 10.
• The project needs Java 1.8 and I have installed Java 20 for jdtls.

I have a few errors in the console too that I can't fix but they shouldn't interfere with the "go to definition" function.
Here's the console:

[ERROR][2024-03-04 01:13:37] .../vim/lsp/rpc.lua:734	"rpc"	"C:\\Users\\myName\\jdk-20.0.2\\bin\\java.exe"	"stderr"	"WARNING: Using incubator modules: jdk.incubator.vector, jdk.incubator.concurrent\r\n"
[ERROR][2024-03-04 01:13:38] .../vim/lsp/rpc.lua:734	"rpc"	"C:\\Users\\myName\\jdk-20.0.2\\bin\\java.exe"	"stderr"	"Mar 04, 2024 1:13:38 AM org.apache.aries.spifly.BaseActivator log\r\nINFO: Registered provider ch.qos.logback.classic.servlet.LogbackServletContainerInitializer of service jakarta.servlet.ServletContainerInitializer in bundle ch.qos.logback.classic\r\n"
[ERROR][2024-03-04 01:13:38] .../vim/lsp/rpc.lua:734	"rpc"	"C:\\Users\\myName\\jdk-20.0.2\\bin\\java.exe"	"stderr"	"Mar 04, 2024 1:13:38 AM org.apache.aries.spifly.BaseActivator log\r\nINFO: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic\r\n"
[WARN][2024-03-04 01:13:40] ...lsp/handlers.lua:137	"The language server jdtls triggers a registerCapability handler despite dynamicRegistration set to false. Report upstream, this warning is harmless"
[ERROR][2024-03-04 01:13:40] ...lsp/handlers.lua:535	"4 Mar 2024, 01:13:40 Command _java.reloadBundles.command not supported on client"

Here's my config:

return {
	{ 'mfussenegger/nvim-dap' },
	{ 
		'mfussenegger/nvim-jdtls',
		config = function() 

			local jdtls = require('jdtls')
			local root_markers = {'gui.bat', '.git', 'bin'}
			local root_dir = require('jdtls.setup').find_root(root_markers)
			local workspace_folder = "C:\\Users\\myName\\Workspace\\" .. vim.fn.fnamemodify(root_dir, ":p:h:t")
			function nnoremap(rhs, lhs, bufopts, desc)
				bufopts.desc = desc
				vim.keymap.set("n", rhs, lhs, bufopts)
			end

			local on_attach = function(client, bufnr)
				local bufopts = { noremap=true, silent=true, buffer=bufnr }
				nnoremap('gD', vim.lsp.buf.declaration, bufopts, "Go to declaration")
				nnoremap('gd', vim.lsp.buf.definition, bufopts, "Go to definition")
				nnoremap('gi', vim.lsp.buf.implementation, bufopts, "Go to implementation")
				nnoremap('K', vim.lsp.buf.hover, bufopts, "Hover text")
				nnoremap('<C-k>', vim.lsp.buf.signature_help, bufopts, "Show signature")
				nnoremap('<space>wa', vim.lsp.buf.add_workspace_folder, bufopts, "Add workspace folder")
				nnoremap('<space>wr', vim.lsp.buf.remove_workspace_folder, bufopts, "Remove workspace folder")
				nnoremap('<space>wl', function()
					print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
					end, bufopts, "List workspace folders")
				nnoremap('<space>D', vim.lsp.buf.type_definition, bufopts, "Go to type definition")
				nnoremap('<space>rn', vim.lsp.buf.rename, bufopts, "Rename")
				nnoremap('<space>ca', vim.lsp.buf.code_action, bufopts, "Code actions")
				vim.keymap.set('v', "<space>ca", "<ESC><CMD>lua vim.lsp.buf.range_code_action()<CR>",
					{ noremap=true, silent=true, buffer=bufnr, desc = "Code actions" })
				nnoremap('<space>f', function() vim.lsp.buf.format { async = true } end, bufopts, "Format file")
				nnoremap("<C-o>", jdtls.organize_imports, bufopts, "Organize imports")
				nnoremap("<space>ev", jdtls.extract_variable, bufopts, "Extract variable")
				nnoremap("<space>ec", jdtls.extract_constant, bufopts, "Extract constant")
				vim.keymap.set('v', "<space>em", [[<ESC><CMD>lua require('jdtls').extract_method(true)<CR>]],
					{ noremap=true, silent=true, buffer=bufnr, desc = "Extract method" })
			end

			local config = {
				flags = {
					debounce_text_changes = 80,
				},
				on_attach = on_attach,  
				root_dir = root_dir, 
				settings = {
					java = {
						format = {
							settings = {
								url = "C:\\Users\\myName\\Downloads\\eclipse-java-google-style.xml",
								profile = "GoogleStyle",
							},
						},
						signatureHelp = { enabled = true },
						contentProvider = { preferred = 'fernflower' },
						-- Specify any completion options
--						completion = {
--							favoriteStaticMembers = {
--								"org.hamcrest.MatcherAssert.assertThat",
--								"org.hamcrest.Matchers.*",
--								"org.hamcrest.CoreMatchers.*",
--								"org.junit.jupiter.api.Assertions.*",
--								"java.util.Objects.requireNonNull",
--								"java.util.Objects.requireNonNullElse",
--								"org.mockito.Mockito.*"
--							},
--							filteredTypes = {
--								"com.sun.*",
--								"io.micrometer.shaded.*",
--								"java.awt.*",
--								"jdk.*", "sun.*",
--							},
--						},
						-- Specify any options for organizing imports
						sources = {
							organizeImports = {
								starThreshold = 9999;
								staticStarThreshold = 9999;
							},
						},
						-- How code generation should act
						codeGeneration = {
							toString = {
								template = "${object.className}{${member.name()}=${member.value}, ${otherMembers}}"
							},
							hashCodeEquals = {
								useJava7Objects = true,
							},
							useBlocks = true,
						},
						configuration = {
							runtimes = {
								{
									name = "JavaSE-1.8",
									path = "C:\\jdk_1.8",
								}
							}
						},
         -- I have tried do add the full paths and the relative paths but they don't seem to work at all.
						build = {
							sources = {
								root_dir .. "path/in/my/project",
								root_dir .. "another_path/in/my/project",
								root_dir .. "more/path/in/my/project/src",
								"path/in/my/project",
								"another_path/in/my/project",
								"more/path/in/my/project/src",
							}
						}
					}
				},
				cmd = {
					"C:\\Users\\myName\\jdk-20.0.2\\bin\\java.exe",
					'-Declipse.application=org.eclipse.jdt.ls.core.id1',
					-- '-Dosgi.bundles.defaultStartLevel=4',
					'-Declipse.product=org.eclipse.jdt.ls.core.product',
					'-Dlog.protocol=true',
					'-Dlog.level=ALL',
					'-Xmx4g',
					'--add-modules=ALL-SYSTEM',
					'--add-opens', 'java.base/java.util=ALL-UNNAMED',
					'--add-opens', 'java.base/java.lang=ALL-UNNAMED',
					'-jar', vim.fn.glob('C:\\Users\\myName\\Downloads\\jdtls\\plugins\\org.eclipse.equinox.launcher_*.jar'),
                                       '-configuration', 'C:\\Users\\myName\\Downloads\\jdtls\\config_win',
                                       '-data', workspace_folder,
				},
			}
                        jdtls.start_or_attach(config)
		end

	},
	{ 'nvim-lua/plenary.nvim' }
}

Any help is welcomed, thank you!

[psvkushal]

Hi @BodeaPeGitHub were you able to set java 1.8 for nvim ?