Programming Tutorials

  The migration to Android Gradle Plugin (AGP) 8.0 represents a significant shift in the Android build ecosystem. For Flutter developers upgrading their   android/   directory—often to support newer Java versions or meet Play Store requirements—the build process frequently terminates with this error: > Task :app:processDebugMainManifest FAILED Execution failed for task ':app:processDebugMainManifest'. > com.android.builder.errors.EvalIssueException: Namespace not specified. Please specify a namespace in the module's build.gradle file like so: android { namespace 'com.example.myapp' } This error is not a suggestion; it is a breaking change enforcement. This post outlines the architectural reason for this shift and details the exact implementation required to resolve it in a Flutter environment. The Root Cause: Manifest vs. Gradle decoupling Historically, the  package  attribute in  AndroidManifest.xml  served two distinct purposes: A...

  You open an existing Flutter project, perhaps one you haven't touched in a few months, or clone a repo that hasn't been updated recently. You hit "Run," and instead of the familiar Gradle build tasks, the console crashes immediately with a cryptic error: java.lang.IllegalArgumentException: Unsupported class file major version 61 Or perhaps: Could not create service of type ScriptPluginFactory using BuildScopeServices.createScriptPluginFactory(). > Unsupported class file major version 65 This error is not a bug in your Dart code. It is an infrastructure collision between your IDE, the Java Development Kit (JDK), and the Gradle build tool. The Root Cause: Bytecode Mismatch The error "Unsupported class file major version" is the JVM's way of saying, "I am trying to read a class file compiled with a newer version of Java than I support." Here is the mapping you need to know: Version 55  = Java 11 Version 61  = Java 17 Version 65  = Java 21 The...