diff --git a/common/build.gradle b/common/build.gradle
index 5f73bd4d..1544fece 100644
--- a/common/build.gradle
+++ b/common/build.gradle
@@ -22,11 +22,17 @@ java {
     targetCompatibility = JavaVersion.VERSION_21
 }
 
+jar {
+    manifest {
+        attributes "Main-Class": "com.xujiayao.discord_mc_chat.common.DMCC"
+    }
+}
+
 //========== Merge JARs ==========
 
 def otherSubprojects = rootProject.subprojects.findAll { it.name != project.name }
 
-tasks.register('mergeJars') {
+tasks.register("mergeJars") {
     dependsOn otherSubprojects.collect { ":$it.name:jar" }
 
     def commonJar = tasks.jar.archiveFile.get().asFile
@@ -36,11 +42,11 @@ tasks.register('mergeJars') {
         tempDir.mkdirs()
         def addedFiles = [:]
         otherSubprojects.each { subproj ->
-            def jarFile = subproj.tasks.named('jar').get().archiveFile.get().asFile
+            def jarFile = subproj.tasks.named("jar").get().archiveFile.get().asFile
             copy {
                 from zipTree(jarFile)
                 into tempDir
-                exclude 'META-INF/MANIFEST.MF'
+                exclude "META-INF/MANIFEST.MF"
                 eachFile { fcd ->
                     def relPath = fcd.relativePath.toString()
                     if (addedFiles.containsKey(relPath)) {
@@ -60,6 +66,6 @@ tasks.register('mergeJars') {
 }
 
 // 保证 mergeJars 在 jar 之后执行
-tasks.named('assemble').configure {
+tasks.named("assemble").configure {
     dependsOn mergeJars
 }