fix

onejar/fabric_26_1/build.gradle.kts

@@ -52,6 +52,9 @@ tasks {
         }
     }
 
+    // loom 的 jar-in-jar 嵌套默认只挂在 jar 任务上，需要手动接到 shadowJar
+    loom.nestJars(named("shadowJar", Jar::class), configurations.getByName("include"))
+
     shadowJar {
         archiveFileName.set("[fabric-26.1]AllMusic-${project.version}.jar")
         destinationDirectory.set(file("${parent!!.projectDir}/../build"))

onejar/fabric_26_2/build.gradle.kts

@@ -51,6 +51,9 @@ tasks {
         }
     }
 
+    // loom 的 jar-in-jar 嵌套默认只挂在 jar 任务上，需要手动接到 shadowJar
+    loom.nestJars(named("shadowJar", Jar::class), configurations.getByName("include"))
+
     shadowJar {
         archiveFileName.set("[fabric-26.2]AllMusic-${project.version}.jar")
         destinationDirectory.set(file("${parent!!.projectDir}/../build"))

onejar/neoforge_26_1/build.gradle.kts

@@ -1,3 +1,5 @@
+import net.fabricmc.loom.build.nesting.NestableJarGenerationTask
+
 plugins {
     id("dev.architectury.loom-no-remap") version Versions.architecturyLoom
 //    id("architectury-plugin") version "3.5-SNAPSHOT"
@@ -54,6 +56,15 @@ tasks {
         }
     }
 
+    // loom 的 jar-in-jar 嵌套默认只挂在 jar 任务上，需要手动接到 shadowJar
+    val processIncludeJars = named("processIncludeJars", NestableJarGenerationTask::class)
+    val shadowJarTask = named("shadowJar", Jar::class)
+    shadowJarTask.configure { dependsOn(processIncludeJars) }
+    loom.nestJars(
+        shadowJarTask,
+        files(fileTree(processIncludeJars.flatMap { it.outputDirectory }).matching { include("**/*.jar") })
+    )
+
     shadowJar {
         archiveFileName.set("[neoforge-26.1]AllMusic-${project.version}.jar")
         destinationDirectory.set(file("${parent!!.projectDir}/../build"))

server/fabric_26_1/build.gradle.kts

@@ -23,6 +23,9 @@ tasks {
         }
     }
 
+    // loom 的 jar-in-jar 嵌套默认只挂在 jar 任务上，需要手动接到 shadowJar
+    loom.nestJars(named("shadowJar", Jar::class), configurations.getByName("include"))
+
     shadowJar {
         archiveFileName.set("[fabric-26.1]AllMusic_Server-${project.version}.jar")
         destinationDirectory.set(file("${parent!!.projectDir}/../build"))

server/fabric_26_2/build.gradle.kts

@@ -23,6 +23,9 @@ tasks {
         }
     }
 
+    // loom 的 jar-in-jar 嵌套默认只挂在 jar 任务上，需要手动接到 shadowJar
+    loom.nestJars(named("shadowJar", Jar::class), configurations.getByName("include"))
+
     shadowJar {
         archiveFileName.set("[fabric-26.2]AllMusic_Server-${project.version}.jar")
         destinationDirectory.set(file("${parent!!.projectDir}/../build"))

server/neoforge_26_1/build.gradle.kts

@@ -1,3 +1,5 @@
+import net.fabricmc.loom.build.nesting.NestableJarGenerationTask
+
 plugins {
     id("dev.architectury.loom-no-remap") version Versions.architecturyLoom
 //    id("architectury-plugin") version "3.5-SNAPSHOT"
@@ -29,6 +31,15 @@ tasks {
         }
     }
 
+    // loom 的 jar-in-jar 嵌套默认只挂在 jar 任务上，需要手动接到 shadowJar
+    val processIncludeJars = named("processIncludeJars", NestableJarGenerationTask::class)
+    val shadowJarTask = named("shadowJar", Jar::class)
+    shadowJarTask.configure { dependsOn(processIncludeJars) }
+    loom.nestJars(
+        shadowJarTask,
+        files(fileTree(processIncludeJars.flatMap { it.outputDirectory }).matching { include("**/*.jar") })
+    )
+
     shadowJar {
         archiveFileName.set("[neoforge-26.1]AllMusic_Server-${project.version}.jar")
         destinationDirectory.set(file("${parent!!.projectDir}/../build"))

server/neoforge_26_2/build.gradle.kts

@@ -1,3 +1,5 @@
+import net.fabricmc.loom.build.nesting.NestableJarGenerationTask
+
 plugins {
     id("dev.architectury.loom-no-remap") version Versions.architecturyLoom
 //    id("architectury-plugin") version "3.5-SNAPSHOT"
@@ -29,6 +31,15 @@ tasks {
         }
     }
 
+    // loom 的 jar-in-jar 嵌套默认只挂在 jar 任务上，需要手动接到 shadowJar
+    val processIncludeJars = named("processIncludeJars", NestableJarGenerationTask::class)
+    val shadowJarTask = named("shadowJar", Jar::class)
+    shadowJarTask.configure { dependsOn(processIncludeJars) }
+    loom.nestJars(
+        shadowJarTask,
+        files(fileTree(processIncludeJars.flatMap { it.outputDirectory }).matching { include("**/*.jar") })
+    )
+
     shadowJar {
         archiveFileName.set("[neoforge-26.2]AllMusic_Server-${project.version}.jar")
         destinationDirectory.set(file("${parent!!.projectDir}/../build"))