diff --git a/LSP-jdtls.sublime-settings b/LSP-jdtls.sublime-settings
index 805e883..ef78f3e 100644
--- a/LSP-jdtls.sublime-settings
+++ b/LSP-jdtls.sublime-settings
@@ -1,6 +1,13 @@
 {
     // We start this language server when we open java files.
     "selector": "source.java",
+    // Declares what URI schemes this server attaches to.
+    "schemes": [
+        // regular files on disk
+        "file",
+        // opened by a DAP-compatible debugger
+        "jdt"
+    ],
     // The startup command.
     "command": [
         "${java_executable}",
diff --git a/plugin.py b/plugin.py
index 28f9d84..77951c9 100644
--- a/plugin.py
+++ b/plugin.py
@@ -3,9 +3,9 @@
 from LSP.plugin import Session
 from LSP.plugin import unregister_plugin
 from LSP.plugin import Request
+from LSP.plugin import Notification
 from LSP.plugin.core.typing import Optional, Any, List, Dict, Mapping, Callable
-from LSP.plugin.core.registry import LspTextCommand
-from LSP.plugin.core.protocol import ExecuteCommandParams, Notification
+
 import os
 import sublime
 from urllib.request import urlopen
@@ -18,7 +18,11 @@
 # TODO: Not part of the public API :(
 from LSP.plugin.core.edit import apply_workspace_edit
 from LSP.plugin.core.edit import parse_workspace_edit
-from LSP.plugin.core.views import location_to_encoded_filename, text_document_identifier
+from LSP.plugin.core.protocol import DocumentUri
+from LSP.plugin.core.protocol import ExecuteCommandParams
+from LSP.plugin.core.registry import LspTextCommand
+from LSP.plugin.core.views import location_to_encoded_filename
+from LSP.plugin.core.views import text_document_identifier
 
 
 DOWNLOAD_URL = "http://download.eclipse.org/jdtls/snapshots"
@@ -156,6 +160,22 @@ def install_or_update(cls) -> None:
                 if os.path.isdir(absdir):
                     shutil.move(absdir, serverdir(cls.storage_subpath()))
 
+    def on_open_uri_async(self, uri: DocumentUri, callback: Callable[[str, str, str], None]) -> bool:
+        if not uri.startswith("jdt:"):
+            return False
+        session = self.weaksession()
+        if not session:
+            return False
+        # https://github.com/redhat-developer/vscode-java/blob/9f32875a67352487f5c414bb7fef04c9b00af89d/src/protocol.ts#L105-L107
+        # https://github.com/redhat-developer/vscode-java/blob/9f32875a67352487f5c414bb7fef04c9b00af89d/src/providerDispatcher.ts#L61-L76
+        # https://github.com/redhat-developer/vscode-java/blob/9f32875a67352487f5c414bb7fef04c9b00af89d/src/providerDispatcher.ts#L27-L28
+        session.send_request_async(
+            Request("java/classFileContents", text_document_identifier(uri), progress=True),
+            lambda resp: callback(uri, resp, "Packages/Java/Java.sublime-syntax"),
+            lambda err: callback("ERROR", str(err), "Packages/Text/Plain text.tmLanguage")
+        )
+        return True
+
     def on_pre_server_command(self, command: Mapping[str, Any], done: Callable[[], None]) -> bool:
         session = self.weaksession()
         if not session: