diff --git a/mirai-core/build.gradle b/mirai-core/build.gradle
index 6e3d69b36..2d3d96a90 100644
--- a/mirai-core/build.gradle
+++ b/mirai-core/build.gradle
@@ -6,7 +6,9 @@ kotlin {
         fromPreset(presets.jvm, "jvm")
         //fromPreset(presets.mingwX64, "mingwX64")
     }
-    jvm()
+    jvm{
+        withJava()
+    }
 
     /*
     mingwX64("mingwX64") {
@@ -82,6 +84,8 @@ kotlin {
         }*/
 
         jvmTest {
+            apply plugin: 'java'
+
         }
 
         all {
@@ -92,4 +96,8 @@ kotlin {
 
 compileKotlinJvm {
 
+}
+
+compileTestJava{
+
 }
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/FriendOnlineStatusChanged.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/FriendOnlineStatusChanged.kt
index e9f4a4031..da8bd702e 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/FriendOnlineStatusChanged.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/FriendOnlineStatusChanged.kt
@@ -11,6 +11,8 @@ import kotlin.properties.Delegates
 
 /**
  * 好友在线状态改变
+ *
+ * TODO 真的是在线状态改变么
  */
 @PacketId(0x00_81u)
 class ServerFriendOnlineStatusChangedPacket(input: ByteReadPacket) : ServerPacket(input) {
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginSuccessPacket.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginSuccessPacket.kt
index d63511844..690efe3cb 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginSuccessPacket.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/login/ServerLoginSuccessPacket.kt
@@ -12,4 +12,4 @@ import net.mamoe.mirai.network.protocol.tim.packet.ServerPacket
  * @author Him188moe
  */
 @PacketId(0x00_ECu)
-class ServerLoginSuccessPacket(input: ByteReadPacket) : ServerPacket(input)
\ No newline at end of file
+class ServerLoginSuccessPacket(input: ByteReadPacket) : ServerPacket(input)//TODO 可能只是 login status change 的返回包
\ No newline at end of file