diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt
index dfc16bc35..a028f44a2 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt
@@ -127,7 +127,7 @@ class Bot(val account: BotAccount, val logger: MiraiLogger) {
         suspend fun getGroup(id: GroupId): Group = id.value.let {
             if (groups.containsKey(it)) groups[it]!!
             else groupsLock.withLock {
-                groups.getOrPut(it) { Group(this@Bot, it) }
+                groups.getOrPut(it) { Group(this@Bot, id) }
             }
         }
     }
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt
index c56b6e869..77220cc42 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt
@@ -66,7 +66,8 @@ inline class GroupInternalId(val value: UInt)
  * - Group ID([Group.internalId]) 是与调用 API 时使用的 id.(在 QQ 客户端中不可见)
  * @author Him188moe
  */
-class Group internal constructor(bot: Bot, id: UInt) : Contact(bot, id) {
+@Suppress("MemberVisibilityCanBePrivate", "CanBeParameter")
+class Group internal constructor(bot: Bot, val groupId: GroupId) : Contact(bot, groupId.value) {
     val internalId = GroupId(id).toInternalId()
     val members: ContactList<QQ>
         //todo members
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/Event.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/Event.kt
index 2f61138b9..1dbf61861 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/Event.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/Event.kt
@@ -8,6 +8,8 @@ import kotlinx.coroutines.withContext
 import net.mamoe.mirai.contact.Contact
 import net.mamoe.mirai.event.internal.broadcastInternal
 import net.mamoe.mirai.network.BotNetworkHandler
+import net.mamoe.mirai.utils.DefaultLogger
+import net.mamoe.mirai.utils.MiraiLogger
 import net.mamoe.mirai.utils.log
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
@@ -39,6 +41,18 @@ abstract class Event {
     fun cancel() {
         cancelled = true
     }
+
+    init {
+        if (EventDebuggingFlag) {
+            EventLogger.logDebug(this::class.simpleName + " created")
+        }
+    }
+}
+
+internal object EventLogger : MiraiLogger by DefaultLogger("Event")
+
+val EventDebuggingFlag: Boolean by lazy {
+    false
 }
 
 /**
@@ -58,7 +72,16 @@ interface Cancellable {
 @Suppress("UNCHECKED_CAST")
 @JvmOverloads
 suspend fun <E : Event> E.broadcast(context: CoroutineContext = EmptyCoroutineContext): E {
-    return withContext(EventScope.coroutineContext + context) { this@broadcast.broadcastInternal() }
+    if (EventDebuggingFlag) {
+        EventLogger.logDebug(this::class.simpleName + " pre broadcast")
+    }
+    try {
+        return withContext(EventScope.coroutineContext + context) { this@broadcast.broadcastInternal() }
+    } finally {
+        if (EventDebuggingFlag) {
+            EventLogger.logDebug(this::class.simpleName + " after broadcast")
+        }
+    }
 }
 
 /**
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/MessageSubscribers.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/MessageSubscribers.kt
index 58bbcc8fd..445c0358a 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/MessageSubscribers.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/MessageSubscribers.kt
@@ -10,6 +10,9 @@ import net.mamoe.mirai.event.events.BotEvent
 import net.mamoe.mirai.event.events.FriendMessageEvent
 import net.mamoe.mirai.event.events.GroupMessageEvent
 import net.mamoe.mirai.message.*
+import net.mamoe.mirai.utils.ExternalImage
+import net.mamoe.mirai.utils.sendTo
+import net.mamoe.mirai.utils.upload
 import kotlin.jvm.JvmName
 
 /**
@@ -33,8 +36,19 @@ abstract class SenderAndMessage<S : Contact>(
      */
     suspend fun reply(message: MessageChain) = subject.sendMessage(message)
 
-    suspend fun reply(plain: String) = reply(PlainText(plain))
     suspend fun reply(message: Message) = reply(message.toChain())
+    suspend fun reply(plain: String) = reply(PlainText(plain))
+
+
+    // region Send to subject
+    suspend inline fun ExternalImage.send() = this.sendTo(subject)
+
+    suspend inline fun ExternalImage.upload(): Image = this.upload(subject)
+    suspend inline fun Image.send() = this.sendTo(subject)
+    suspend inline fun ImageId.send() = this.sendTo(subject)
+    suspend inline fun Message.send() = this.sendTo(subject)
+
+    // endregion
 }
 
 /**
@@ -134,11 +148,16 @@ suspend inline fun Bot.subscribeFriendMessages(noinline listeners: suspend Messa
 
 internal typealias MessageListener<T> = @MessageListenerDsl suspend T.(String) -> Unit
 
-internal typealias MessageReplier<T> = @MessageListenerDsl suspend T.(String) -> String
+internal typealias MessageReplier<T> = @MessageListenerDsl suspend T.(String) -> Message
 
-internal suspend inline operator fun <T : SenderAndMessage<*>> MessageListener<T>.invoke(t: T) = this.invoke(t, t.message.toString())
+internal typealias StringReplier<T> = @MessageListenerDsl suspend T.(String) -> String
+
+internal suspend inline operator fun <T : SenderAndMessage<*>> MessageListener<T>.invoke(t: T) = this.invoke(t, t.message.stringValue)
 @JvmName("invoke1") //Avoid Platform declaration clash
-internal suspend inline operator fun <T : SenderAndMessage<*>> MessageReplier<T>.invoke(t: T) = this.invoke(t, t.message.toString())
+internal suspend inline operator fun <T : SenderAndMessage<*>> StringReplier<T>.invoke(t: T): String = this.invoke(t, t.message.stringValue)
+
+@JvmName("invoke2") //Avoid Platform declaration clash
+internal suspend inline operator fun <T : SenderAndMessage<*>> MessageReplier<T>.invoke(t: T): Message = this.invoke(t, t.message.stringValue)
 
 /**
  * 消息订阅构造器
@@ -148,27 +167,35 @@ internal suspend inline operator fun <T : SenderAndMessage<*>> MessageReplier<T>
  */
 @Suppress("unused")
 @MessageListenerDsl
-inline class MessageSubscribersBuilder<T : SenderAndMessage<*>>(
+//TODO 将这个类 inline 后会导致 kotlin 编译错误. 等待修复后再 inline
+class MessageSubscribersBuilder<T : SenderAndMessage<*>>(
     val handlerConsumer: suspend (MessageListener<T>) -> Unit
 ) {
     suspend inline fun case(equals: String, trim: Boolean = true, noinline listener: MessageListener<T>) = content({ equals == if (trim) it.trim() else it }, listener)
     suspend inline fun contains(value: String, noinline listener: MessageListener<T>) = content({ value in it }, listener)
-    suspend inline fun replyEndsWith(value: String, noinline replier: MessageReplier<T>) = content({ it.endsWith(value) }) { replier(this) }
     suspend inline fun startsWith(start: String, noinline listener: MessageListener<T>) = content({ it.startsWith(start) }, listener)
     suspend inline fun endsWith(start: String, noinline listener: MessageListener<T>) = content({ it.endsWith(start) }, listener)
     suspend inline fun sentBy(id: UInt, noinline listener: MessageListener<T>) = content({ sender.id == id }, listener)
     suspend inline fun sentBy(id: Long, noinline listener: MessageListener<T>) = sentBy(id.toUInt(), listener)
     suspend inline fun <reified M : Message> has(noinline listener: MessageListener<T>) = handlerConsumer { if (message.any<M>()) listener(this) }
     suspend inline fun content(noinline filter: T.(String) -> Boolean, noinline listener: MessageListener<T>) =
-        handlerConsumer { if (this.filter(message.toString())) listener(this) }
+        handlerConsumer { if (this.filter(message.stringValue)) listener(this) }
+
+    suspend infix fun String.caseReply(replier: StringReplier<T>) = case(this, true) { this@case.reply(replier(this)) }
+    suspend infix fun String.containsReply(replier: StringReplier<T>) = content({ this@containsReply in it }) { replier(this) }
+    suspend infix fun String.startsWithReply(replier: StringReplier<T>) = content({ it.startsWith(this@startsWithReply) }) { replier(this) }
+    suspend infix fun String.endswithReply(replier: StringReplier<T>) = content({ it.endsWith(this@endswithReply) }) { replier(this) }
+
+    suspend infix fun String.reply(reply: String) = case(this) { this@case.reply(reply) }
+    suspend infix fun String.reply(reply: StringReplier<T>) = case(this) { this@case.reply(reply(this)) }
 
 
+/* 易产生迷惑感
     suspend inline fun replyCase(equals: String, trim: Boolean = true, noinline replier: MessageReplier<T>) = case(equals, trim) { reply(replier(this)) }
     suspend inline fun replyContains(value: String, noinline replier: MessageReplier<T>) = content({ value in it }) { replier(this) }
     suspend inline fun replyStartsWith(value: String, noinline replier: MessageReplier<T>) = content({ it.startsWith(value) }) { replier(this) }
-
-    suspend infix fun String.reply(reply: String) = case(this) { this.reply(reply) }
-    suspend infix fun String.reply(reply: MessageReplier<T>) = case(this) { this.reply(reply(this)) }
+    suspend inline fun replyEndsWith(value: String, noinline replier: MessageReplier<T>) = content({ it.endsWith(value) }) { replier(this) }
+*/
 }
 
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/internal/InternalEventListeners.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/internal/InternalEventListeners.kt
index 9e3e450a1..3415f3982 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/internal/InternalEventListeners.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/internal/InternalEventListeners.kt
@@ -21,11 +21,11 @@ import kotlin.reflect.KClass
  * @author Him188moe
  */
 internal suspend fun <E : Event> KClass<E>.subscribeInternal(listener: Listener<E>): Unit = with(this.listeners()) {
-    if (mainMutex.tryLock()) {//能锁则代表这个事件目前没有正在广播.
+    if (mainMutex.tryLock(listener)) {//能锁则代表这个事件目前没有正在广播.
         try {
             add(listener)//直接修改主监听者列表
         } finally {
-            mainMutex.unlock()
+            mainMutex.unlock(listener)
         }
         return
     }
@@ -38,7 +38,7 @@ internal suspend fun <E : Event> KClass<E>.subscribeInternal(listener: Listener<
     EventScope.launch {
         //启动协程并等待正在进行的广播结束, 然后将缓存转移到主监听者列表
         //启动后的协程马上就会因为锁而被挂起
-        mainMutex.withLock {
+        mainMutex.withLock(listener) {
             cacheMutex.withLock {
                 if (cache.size != 0) {
                     addAll(cache)
@@ -55,6 +55,7 @@ internal suspend fun <E : Event> KClass<E>.subscribeInternal(listener: Listener<
  * @author Him188moe
  */
 sealed class Listener<in E : Event> {
+    internal val lock = Mutex()
     abstract suspend fun onEvent(event: E): ListeningStatus
 }
 
@@ -127,8 +128,25 @@ internal object EventListenerManger {
 
 @Suppress("UNCHECKED_CAST")
 internal suspend fun <E : Event> E.broadcastInternal(): E {
-    suspend fun callListeners(listeners: EventListeners<in E>) = listeners.mainMutex.withLock {
-        listeners.inlinedRemoveIf { it.onEvent(this) == ListeningStatus.STOPPED }
+    suspend fun callListeners(listeners: EventListeners<in E>) {
+        suspend fun callAndRemoveIfRequired() {
+            listeners.inlinedRemoveIf {
+                if (it.lock.tryLock()) {
+                    try {
+                        it.onEvent(this) == ListeningStatus.STOPPED
+                    } finally {
+                        it.lock.unlock()
+                    }
+                } else false
+            }
+        }
+
+        //自己持有, 则是在一个事件中
+        if (listeners.mainMutex.holdsLock(listeners)) {
+            callAndRemoveIfRequired()
+        } else listeners.mainMutex.withLock(listeners) {
+            callAndRemoveIfRequired()
+        }
     }
 
     callListeners(this::class.listeners() as EventListeners<in E>)
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotNetworkHandler.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotNetworkHandler.kt
index 69e77c9dc..bda5b2b86 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotNetworkHandler.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotNetworkHandler.kt
@@ -2,7 +2,6 @@ package net.mamoe.mirai.network
 
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Job
 import kotlinx.coroutines.cancelChildren
 import net.mamoe.mirai.network.protocol.tim.TIMBotNetworkHandler.BotSocketAdapter
 import net.mamoe.mirai.network.protocol.tim.TIMBotNetworkHandler.LoginHandler
@@ -16,6 +15,7 @@ import net.mamoe.mirai.network.protocol.tim.packet.login.LoginResult
 import net.mamoe.mirai.network.protocol.tim.packet.login.RequestSKeyPacket
 import net.mamoe.mirai.utils.BotNetworkConfiguration
 import net.mamoe.mirai.utils.io.PlatformDatagramChannel
+import kotlin.coroutines.ContinuationInterceptor
 
 /**
  * Mirai 的网络处理器, 它承担所有数据包([Packet])的处理任务.
@@ -87,6 +87,6 @@ interface BotNetworkHandler<Socket : DataPacketSocketAdapter> : CoroutineScope {
      */
     suspend fun close(cause: Throwable? = null) {
         //todo check??
-        coroutineContext[Job]!!.cancelChildren(CancellationException("handler closed", cause))
+        coroutineContext[ContinuationInterceptor]!!.cancelChildren(CancellationException("handler closed", cause))
     }
 }
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt
index 194f6e201..6d9461902 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt
@@ -79,8 +79,7 @@ class BotSession(
      * @see Bot.withSession 转换接收器 (receiver, 即 `this` 的指向) 为 [BotSession]
      */
     suspend inline fun <reified P : ServerPacket, R> OutgoingPacket.sendAndExpect(noinline handler: suspend (P) -> R): CompletableDeferred<R> {
-        val deferred: CompletableDeferred<R> =
-            coroutineContext[Job].takeIf { it != null }?.let { CompletableDeferred<R>(it) } ?: CompletableDeferred()
+        val deferred: CompletableDeferred<R> = CompletableDeferred(coroutineContext[Job])
         bot.network.addHandler(TemporaryPacketHandler(P::class, deferred, this@BotSession).also {
             it.toSend(this)
             it.onExpect(handler)
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt
index 3bb50858c..1549cc2a3 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/TIMBotNetworkHandler.kt
@@ -24,7 +24,6 @@ import net.mamoe.mirai.network.protocol.tim.packet.login.*
 import net.mamoe.mirai.network.session
 import net.mamoe.mirai.qqAccount
 import net.mamoe.mirai.utils.*
-import net.mamoe.mirai.utils.internal.inlinedRemoveIf
 import net.mamoe.mirai.utils.io.*
 import kotlin.coroutines.CoroutineContext
 
@@ -129,10 +128,11 @@ internal class TIMBotNetworkHandler internal constructor(private val bot: Bot) :
                 try {
                     channel.read(buffer)// JVM: withContext(IO)
                 } catch (e: ReadPacketInternalException) {
-                    // read failed, continue and reread
+                    bot.logger.logError("Socket channel read failed: ${e.message}")
                     continue
                 } catch (e: Throwable) {
-                    e.log()// other unexpected exceptions caught.
+                    bot.logger.logError("Caught unexpected exceptions")
+                    bot.logger.logError(e)
                     continue
                 } finally {
                     if (!buffer.canRead() || buffer.readRemaining == 0) {//size==0
@@ -146,7 +146,11 @@ internal class TIMBotNetworkHandler internal constructor(private val bot: Bot) :
                     // `.use`: Ensure that the packet is consumed **totally**
                     // so that all the buffers are released
                     ByteReadPacket(buffer, IoBuffer.Pool).use {
-                        distributePacket(it.parseServerPacket(buffer.readRemaining))
+                        try {
+                            distributePacket(it.parseServerPacket(buffer.readRemaining))
+                        } catch (e: Exception) {
+                            bot.logger.logError(e)
+                        }
                     }
                 }
             }
@@ -200,14 +204,15 @@ internal class TIMBotNetworkHandler internal constructor(private val bot: Bot) :
                     bot.logger.logCyan("Packet received: $packet")
                 }
 
+                //Remove first to release the lock
                 handlersLock.withLock {
-                    temporaryPacketHandlers.inlinedRemoveIf {
-                        it.shouldRemove(this@TIMBotNetworkHandler[ActionPacketHandler].session, packet)
-                    }
+                    temporaryPacketHandlers.filter { it.filter(session, packet) }
+                }.forEach {
+                    it.doReceive(packet)
                 }
 
                 if (packet is ServerEventPacket) {
-                    //must ensure the response packet is sent
+                    //ensure the response packet is sent
                     sendPacket(packet.ResponsePacket(bot.qqAccount, sessionKey))
                 }
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/PacketHandler.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/PacketHandler.kt
index 259ebd1d8..752ea44c9 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/PacketHandler.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/PacketHandler.kt
@@ -2,7 +2,6 @@ package net.mamoe.mirai.network.protocol.tim.handler
 
 import net.mamoe.mirai.network.BotSession
 import net.mamoe.mirai.network.protocol.tim.packet.ServerPacket
-import kotlin.reflect.KClass
 
 /**
  * 数据包(接受/发送)处理器
@@ -20,14 +19,13 @@ abstract class PacketHandler(
 }
 
 internal class PacketHandlerNode<T : PacketHandler>(
-        val clazz: KClass<T>,
-        val instance: T,
-        val key: PacketHandler.Key<T>
+    val instance: T,
+    val key: PacketHandler.Key<T>
 )
 
 internal fun <T : PacketHandler> T.asNode(key: PacketHandler.Key<T>): PacketHandlerNode<T> {
     @Suppress("UNCHECKED_CAST")
-    return PacketHandlerNode(this::class as KClass<T>, this, key)
+    return PacketHandlerNode(this, key)
 }
 
 internal open class PacketHandlerList : MutableList<PacketHandlerNode<*>> by mutableListOf() {
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/TemporaryPacketHandler.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/TemporaryPacketHandler.kt
index 1edabe34a..3b0376706 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/TemporaryPacketHandler.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/handler/TemporaryPacketHandler.kt
@@ -20,9 +20,9 @@ import kotlin.reflect.KClass
  * @see BotSession.sendAndExpect
  */
 class TemporaryPacketHandler<P : ServerPacket, R>(
-        private val expectationClass: KClass<P>,
-        private val deferred: CompletableDeferred<R>,
-        private val fromSession: BotSession
+    private val expectationClass: KClass<P>,
+    private val deferred: CompletableDeferred<R>,
+    private val fromSession: BotSession
 ) {
     private lateinit var toSend: OutgoingPacket
 
@@ -45,19 +45,17 @@ class TemporaryPacketHandler<P : ServerPacket, R>(
         session.socket.sendPacket(toSend)
     }
 
-    suspend fun shouldRemove(session: BotSession, packet: ServerPacket): Boolean {
-        if (expectationClass.isInstance(packet) && session === this.fromSession) {
+    suspend fun filter(session: BotSession, packet: ServerPacket): Boolean = expectationClass.isInstance(packet) && session === this.fromSession
 
-            @Suppress("UNCHECKED_CAST")
-            val ret = try {
-                handler(packet as P)
-            } catch (e: Exception) {
-                deferred.completeExceptionally(e)
-                return true
-            }
-            deferred.complete(ret)
-            return true
+    suspend fun doReceive(packet: ServerPacket) {
+        @Suppress("UNCHECKED_CAST")
+        val ret = try {
+            handler(packet as P)
+        } catch (e: Exception) {
+            deferred.completeExceptionally(e)
+            return
         }
-        return false
+        deferred.complete(ret)
+        return
     }
 }
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/UploadGroupImage.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/UploadGroupImage.kt
index 4c3486743..dd266b43b 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/UploadGroupImage.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/action/UploadGroupImage.kt
@@ -2,6 +2,7 @@
 
 package net.mamoe.mirai.network.protocol.tim.packet.action
 
+import kotlinx.coroutines.withContext
 import kotlinx.io.core.*
 import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.GroupId
@@ -16,6 +17,7 @@ import net.mamoe.mirai.qqAccount
 import net.mamoe.mirai.utils.ExternalImage
 import net.mamoe.mirai.utils.httpPostGroupImage
 import net.mamoe.mirai.utils.io.*
+import kotlin.coroutines.coroutineContext
 
 
 /**
@@ -32,24 +34,27 @@ class OverFileSizeMaxException : IllegalStateException()
  * @throws OverFileSizeMaxException 如果文件过大, 服务器拒绝接收时
  */
 suspend fun Group.uploadImage(image: ExternalImage): ImageId = withSession {
+    val userContext = coroutineContext
     GroupImageIdRequestPacket(bot.qqAccount, internalId, image, sessionKey)
         .sendAndExpect<GroupImageIdRequestPacket.Response, Unit> {
-            when (it.state) {
-                GroupImageIdRequestPacket.Response.State.REQUIRE_UPLOAD -> {
-                    httpPostGroupImage(
-                        botAccount = bot.qqAccount,
-                        groupId = GroupId(id),
-                        imageInput = image.input,
-                        inputSize = image.inputSize,
-                        uKeyHex = it.uKey!!.toUHexString("")
-                    )
+            withContext(userContext) {
+                when (it.state) {
+                    GroupImageIdRequestPacket.Response.State.REQUIRE_UPLOAD -> {
+                        httpPostGroupImage(
+                            botAccount = bot.qqAccount,
+                            groupId = GroupId(id),
+                            imageInput = image.input,
+                            inputSize = image.inputSize,
+                            uKeyHex = it.uKey!!.toUHexString("")
+                        )
+                    }
+
+                    GroupImageIdRequestPacket.Response.State.ALREADY_EXISTS -> {
+
+                    }
+
+                    GroupImageIdRequestPacket.Response.State.OVER_FILE_SIZE_MAX -> throw OverFileSizeMaxException()
                 }
-
-                GroupImageIdRequestPacket.Response.State.ALREADY_EXISTS -> {
-
-                }
-
-                GroupImageIdRequestPacket.Response.State.OVER_FILE_SIZE_MAX -> throw OverFileSizeMaxException()
             }
         }.join()
     image.groupImageId
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/MiraiLogger.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/MiraiLogger.kt
index 4cbfc9d3b..51b363237 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/MiraiLogger.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/MiraiLogger.kt
@@ -42,6 +42,8 @@ interface MiraiLogger {
 
     fun logError(any: Any?)
 
+    fun logError(e: Throwable) = log(e)
+
     fun logDebug(any: Any?)
 
     fun logCyan(any: Any?)
@@ -94,6 +96,8 @@ abstract class MiraiLoggerPlatformBase : MiraiLogger {
         follower?.logError(any)
     }
 
+    override fun logError(e: Throwable) = log(e)
+
     final override fun logDebug(any: Any?) {
         logDebug0(any)
         follower?.logDebug(any)
diff --git a/mirai-demos/mirai-demo-1/src/main/java/demo/subscribe/SubscribeSamples.kt b/mirai-demos/mirai-demo-1/src/main/java/demo/subscribe/SubscribeSamples.kt
index e49f6e946..b8b8d9b41 100644
--- a/mirai-demos/mirai-demo-1/src/main/java/demo/subscribe/SubscribeSamples.kt
+++ b/mirai-demos/mirai-demo-1/src/main/java/demo/subscribe/SubscribeSamples.kt
@@ -47,7 +47,7 @@ private fun readTestAccount(): BotAccount? {
 suspend fun Bot.messageDSL() {
     //监听所有 bot 的来自所有群和好友的消息
     subscribeMessages {
-        replyCase("你好") { "你好" }
+        "你好" reply "你好!"
 
         has<Image> {
             // this: SenderAndMessage
@@ -65,9 +65,9 @@ suspend fun Bot.messageDSL() {
             reply(message)
         }
 
-        replyContains("123") { "你的消息里面包含 123" }
+        "123" reply "你的消息里面包含 123"
 
-        replyCase("我的qq") { sender.id.toString() }
+        "我的qq" reply { sender.id.toString() }
 
         sentBy(1040400290) {
             reply("是你!")
diff --git a/mirai-demos/mirai-demo-gentleman/build.gradle b/mirai-demos/mirai-demo-gentleman/build.gradle
index e0a26eb75..08e1a2973 100644
--- a/mirai-demos/mirai-demo-gentleman/build.gradle
+++ b/mirai-demos/mirai-demo-gentleman/build.gradle
@@ -2,7 +2,10 @@ apply plugin: "kotlin"
 apply plugin: "java"
 
 dependencies {
-    compile project(":mirai-core")
+    implementation project(":mirai-core")
     api group: 'org.jetbrains.kotlin', name: 'kotlin-stdlib-jdk8', version: kotlin_version
     api group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-core', version: coroutines_version
+
+    compile group: 'com.alibaba', name: 'fastjson', version: '1.2.62'
+    implementation 'org.jsoup:jsoup:1.12.1'
 }