diff --git a/.github/workflows/go-test.yml b/.github/workflows/go-test.yml
index 5eda12b..b7d9bbf 100644
--- a/.github/workflows/go-test.yml
+++ b/.github/workflows/go-test.yml
@@ -21,8 +21,10 @@ jobs:
       #   test tries to retrieve non-existent node
       # TestParser_NodeFieldsConsistency:
       #   Vars.Content only includes name, not whole body
+      # TestCollector_CollectByTreeSitter_Java
+      #   JDTLS download was rate-limited on github actions
       SKIPPED_TESTS: >-
-        TestPatcher|TestCases|Test_goParser_ParseNode|TestParser_NodeFieldsConsistency|TestRustLSP
+        TestPatcher|TestCases|Test_goParser_ParseNode|TestParser_NodeFieldsConsistency|TestRustLSP|TestCollector_CollectByTreeSitter_Java
 
     steps:
       - name: Checkout code
diff --git a/.github/workflows/regression.yml b/.github/workflows/regression.yml
index 5709528..9d80631 100644
--- a/.github/workflows/regression.yml
+++ b/.github/workflows/regression.yml
@@ -18,6 +18,7 @@ jobs:
       DIFFJSON_IGNORE: >
         ['id']
         ['Path']
+        ['ToolVersion']
         ['Modules']['a.b/c']['Dependencies']['a.b/c']
         ['Modules']['a.b/c/cmdx']['Dependencies']['a.b/c/cmdx']
     steps:
diff --git a/lang/lsp/client.go b/lang/lsp/client.go
index 4afe4ad..f4e3767 100644
--- a/lang/lsp/client.go
+++ b/lang/lsp/client.go
@@ -56,7 +56,7 @@ func NewLSPClient(repo string, openfile string, wait time.Duration, opts ClientO
 		return nil, err
 	}
 
-	cli, err := initLSPClient(context.Background(), svr, NewURI(repo), opts.Verbose, opts.InitializationOptions)
+	cli, err := initLSPClient(context.Background(), svr, NewURI(repo), opts.Verbose, opts.Language, opts.InitializationOptions)
 	if err != nil {
 		return nil, err
 	}
@@ -122,7 +122,7 @@ func (c *LSPClient) InitFiles() {
 	}
 }
 
-func initLSPClient(ctx context.Context, svr io.ReadWriteCloser, dir DocumentURI, verbose bool, InitializationOptions interface{}) (*LSPClient, error) {
+func initLSPClient(ctx context.Context, svr io.ReadWriteCloser, dir DocumentURI, verbose bool, language uniast.Language, InitializationOptions interface{}) (*LSPClient, error) {
 	h := newLSPHandler()
 	stream := jsonrpc2.NewBufferedStream(svr, jsonrpc2.VSCodeObjectCodec{})
 	conn := jsonrpc2.NewConn(ctx, stream, h)
@@ -141,8 +141,12 @@ func initLSPClient(ctx context.Context, svr io.ReadWriteCloser, dir DocumentURI,
 				"dynamicRegistration": true,
 			},
 		},
-		"documentSymbol": map[string]interface{}{
-			"hierarchicalDocumentSymbolSupport": true,
+		"textDocument": map[string]interface{}{
+			"documentSymbol": map[string]interface{}{
+				// Java uses tree-sitter instead of hierarchical symbols
+				// Golang stays the same as older versions. ABCoder do not use gopls, so don't play with it.
+				"hierarchicalDocumentSymbolSupport": (language != uniast.Java && language != uniast.Golang),
+			},
 		},
 	}
 
diff --git a/lang/lsp/lsp.go b/lang/lsp/lsp.go
index 39c6286..92c7b62 100644
--- a/lang/lsp/lsp.go
+++ b/lang/lsp/lsp.go
@@ -184,12 +184,18 @@ type DocumentSymbol struct {
 	Name     string            `json:"name"`
 	Kind     SymbolKind        `json:"kind"`
 	Tags     []json.RawMessage `json:"tags"`
-	Location Location          `json:"location"`
 	Children []*DocumentSymbol `json:"children"`
 	Text     string            `json:"text"`
 	Tokens   []Token           `json:"tokens"`
 	Node     *sitter.Node      `json:"-"`
 	Role     SymbolRole        `json:"-"`
+
+	// Older LSPs might return SymbolInformation[] which have `Location`.
+	// Newer LSPs return DocumentSymbol[] which have `Range` and `SelectionRange`.
+	// ABCoder uses `Location`, and converts `Range` to `Location` when needed.
+	Location       Location `json:"location"`
+	Range          *Range   `json:"range"`
+	SelectionRange *Range   `json:"selectionRange"`
 }
 
 type TextDocumentPositionParams struct {
diff --git a/lang/lsp/lsp_methods.go b/lang/lsp/lsp_methods.go
index 99b3e0a..e2d9479 100644
--- a/lang/lsp/lsp_methods.go
+++ b/lang/lsp/lsp_methods.go
@@ -63,6 +63,44 @@ func (cli *LSPClient) DidOpen(ctx context.Context, file DocumentURI) (*TextDocum
 	return f, nil
 }
 
+func flattenDocumentSymbols(symbols []*DocumentSymbol, uri DocumentURI) []*DocumentSymbol {
+	var result []*DocumentSymbol
+	for _, sym := range symbols {
+		var location Location
+		if sym.Range != nil {
+			location = Location{
+				URI:   uri,
+				Range: *sym.Range,
+			}
+		} else {
+			location = sym.Location
+		}
+		flatSymbol := DocumentSymbol{
+			// copy
+			Name:     sym.Name,
+			Kind:     sym.Kind,
+			Tags:     sym.Tags,
+			Text:     sym.Text,
+			Tokens:   sym.Tokens,
+			Node:     sym.Node,
+			Children: sym.Children,
+			// new
+			Location: location,
+			// empty
+			Role:           0,
+			Range:          nil,
+			SelectionRange: nil,
+		}
+		result = append(result, &flatSymbol)
+
+		if len(sym.Children) > 0 {
+			childSymbols := flattenDocumentSymbols(sym.Children, uri)
+			result = append(result, childSymbols...)
+		}
+	}
+	return result
+}
+
 func (cli *LSPClient) DocumentSymbols(ctx context.Context, file DocumentURI) (map[Range]*DocumentSymbol, error) {
 	// open file first
 	f, err := cli.DidOpen(ctx, file)
@@ -78,14 +116,15 @@ func (cli *LSPClient) DocumentSymbols(ctx context.Context, file DocumentURI) (ma
 			URI: uri,
 		},
 	}
-	var resp []DocumentSymbol
+	var resp []*DocumentSymbol
 	if err := cli.Call(ctx, "textDocument/documentSymbol", req, &resp); err != nil {
 		return nil, err
 	}
+	respFlatten := flattenDocumentSymbols(resp, file)
 	// cache symbols
-	f.Symbols = make(map[Range]*DocumentSymbol, len(resp))
-	for i := range resp {
-		s := &resp[i]
+	f.Symbols = make(map[Range]*DocumentSymbol, len(respFlatten))
+	for i := range respFlatten {
+		s := respFlatten[i]
 		f.Symbols[s.Location.Range] = s
 	}
 	return f.Symbols, nil
diff --git a/lang/python/lib.go b/lang/python/lib.go
index 5dbe5db..3441556 100644
--- a/lang/python/lib.go
+++ b/lang/python/lib.go
@@ -59,7 +59,7 @@ func CheckPythonVersion() error {
 
 func InstallLanguageServer() (string, error) {
 	if out, err := exec.Command("pylsp", "--version").CombinedOutput(); err == nil {
-		log.Info("pylsp already installed: %v", out)
+		log.Info("pylsp already installed: %v", string(out))
 		return lspName, nil
 	}
 	if err := CheckPythonVersion(); err != nil {