Refine doc & Remove redundant file

CONTRIBUTING.md

@@ -51,11 +51,7 @@ The extension uses a Gradle plugin (`com.microsoft.gradle.GradlePlugin`) to get
 1. Run vscode launch configuration `Debug Gradle Server & Extension`.
 2. Run vscode launch configuration `Attach to Gradle Server` when you notice the `Gradle: Connecting...` message in the bottom status bar.
 
-> **Note:** If the "Java: Error" message appears in the bottom status bar and the following error is logged in the `.log` file:
-> ```java
-> java.lang.NullPointerException: Cannot invoke "ch.epfl.scala.bsp4j.WorkspaceBuildTargetsResult.getTargets()"
-> ```
-> it indicates that the connection attempt to the Gradle Server was too slow. The [GradleBuildClient](/extension/jdtls.ext/com.microsoft.gradle.bs.importer/src/com/microsoft/gradle/bs/importer/ImporterPlugin.java#L107) requires an active Gradle Server to successfully establish a connection. If you encounter this issue, please retry the connection promptly to avoid this error.
+> **Note:** If `[error] Error connecting to gradle server: Failed to connect before the deadline`  appears in the `Gradle for Java` output channel, it indicates that the connection attempt to the Gradle Server was too slow. The [GradleBuildClient](/extension/jdtls.ext/com.microsoft.gradle.bs.importer/src/com/microsoft/gradle/bs/importer/ImporterPlugin.java#L107) requires an active Gradle Server to successfully establish a connection. If you encounter this issue, please retry the connection promptly to avoid this error.
 
 ## Development Workflow
 

proto/gradle.proto

@@ -11,9 +11,6 @@ service Gradle {
   rpc RunBuild(RunBuildRequest) returns (stream RunBuildReply) {}
   rpc CancelBuild(CancelBuildRequest) returns (CancelBuildReply) {}
   rpc CancelBuilds(CancelBuildsRequest) returns (CancelBuildsReply) {}
-  rpc GetDaemonsStatus(GetDaemonsStatusRequest) returns (GetDaemonsStatusReply) {}
-  rpc StopDaemons(StopDaemonsRequest) returns (StopDaemonsReply) {}
-  rpc StopDaemon(StopDaemonRequest) returns (StopDaemonReply) {}
   rpc executeCommand(ExecuteCommandRequest) returns (ExecuteCommandReply) {}
 }
 
@@ -109,43 +106,6 @@ message CancelBuildsReply {
   string message = 1;
 }
 
-message GetDaemonsStatusRequest {
-  string project_dir = 1;
-}
-
-message GetDaemonsStatusReply {
-  repeated DaemonInfo daemon_info = 1;
-}
-
-message StopDaemonsRequest {
-  string project_dir = 1;
-}
-
-message StopDaemonsReply {
-  string message = 1;
-}
-
-message StopDaemonRequest {
-  string pid = 1;
-}
-
-message StopDaemonReply {
-  string message = 1;
-}
-
-message DaemonInfo {
-  enum DaemonStatus {
-    IDLE = 0;
-    BUSY = 1;
-    STOPPED = 2;
-    STOPPING = 3;
-    CANCELED = 4;
-  }
-  string pid = 1;
-  DaemonStatus status = 2;
-  string info = 3;
-}
-
 message GradleConfig {
   string gradle_home = 1;
   string user_home = 2;