A Unity 6 Android build can print errors and still leave the Unity Editor process with exit code 0. That code alone does not prove the build succeeded—or failed. Check Unity’s build verdict, the build report, the complete log, and the APK or AAB before deciding what happened.
Why exit code 0 does not settle the build result
Unity’s command-line behavior depends on how the build was started. For a built-in build that uses a build profile, Unity’s CLI uses the terminal build verdict when the log contains one; its documentation cautions against relying on the Editor process code alone. If the log has no terminal verdict, the CLI falls back to the process code. A custom --execute-method build is different: the method owns the exit behavior, so the method must decide whether to return a failure code.
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This distinction matters in continuous integration. A process may finish with code 0 even though the build report contains errors or a project-specific success condition was not met. Conversely, an error-looking message in a log does not by itself establish that the final build failed. Unity’s Build and run test reference explains the CLI verdict behavior.
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Before changing Android settings, record the complete Unity version, including its 6000.x patch identifier, the operating system, and the build route. Note whether you built with the Editor’s Build button, a Unity CLI build profile, or a custom execute method. Unity’s release notes include Android tooling and build error-handling changes across releases, so a fix or known issue for one patch should not be assumed to apply to another. See the Unity 6 release notes.
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Keep the full Editor/build log rather than only the final lines. Find the first actionable error and identify the stage that emitted it. Unity prepares the Android project and its inputs before running Gradle; a project-generation problem, an Android project modification callback exception, a Gradle error, and a defective final artifact are separate cases. Unity’s Android build pipeline overview describes how Unity gathers project resources, code libraries, plug-ins, Gradle templates, and manifest templates, applies settings and callbacks, and then runs Gradle.
Use a success check that matches your build route
Editor Build button or built-in CLI profile
- Read the complete log for Unity’s terminal build verdict. When it is present, use that verdict rather than treating the Editor process code as the sole result.
- Confirm that the expected APK or AAB exists at the intended path.
- Check any project-critical artifact contents, such as required manifest values, against your own requirements.
Custom --execute-method build
- Have the method inspect the returned
BuildReport, including its result and error count. - Define project policy explicitly: decide whether any report errors, a non-success result, or a failed artifact assertion should fail the job.
- Make the method exit nonzero when that policy says the build is unacceptable. The CLI relies on the custom method’s exit code for this route.
Artifact and manifest checks need to reflect what your application actually requires; there is no universal assertion that fits every Android project. A Unity 6 case report dated 7 September 2026 describes successful process status alongside report errors or an unmet build expectation in Unity 6000.4.0f1 batch mode on macOS. It recommends checking the report and resulting APK, but it is an individual case rather than a guarantee about all Unity 6 builds. Read the case report.
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Follow the first Android error to its stage
Use the detailed console message to determine which, if any, of these documented Android failure classes matches your log. They are possibilities, not a diagnosis without the project log.
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Resource packaging: AAPT failure
If the log says Failed to re-package resources, Unity’s troubleshooting guide identifies AAPT failure as the relevant stage and missing or duplicate resources in Android plug-ins as common causes. Use the detailed error to identify the resource and the plug-in that supplies it; do not remove or replace resources blindly. Unity’s Android troubleshooting guide
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Manifest merge conflict
Unity combines its manifest with manifests supplied by plug-ins. An incompatible plug-in manifest can conflict with Unity’s main manifest. Inspect the merge error for the specific attribute and contributing manifest before editing templates or adding merge rules.
Duplicate Java classes during DEX conversion
A Java plug-in included twice can cause duplicate classes during DEX conversion. Identify the class named in the error, then trace which dependencies or plug-ins package it before removing a copy.
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Gradle or tooling behavior
Unity’s Android build eventually runs Gradle, but a Gradle failure is only one possible stage. Unity 6 release notes track changes to Android Gradle Plugin and Gradle versions, SDK/build tools, Android logging, and build error handling. Check the notes for the exact Editor patch and the first failing step in your log rather than applying a generic Unity 6 fix.
What the exit code cannot tell you by itself
Without the Unity patch version, command or build script, complete log, BuildReport, and APK/AAB, the cause cannot be identified reliably. A callback exception, a logged message that did not make the report fail, a setting that was not applied, an asynchronous operation, or a plug-in/Gradle issue are hypotheses to test—not conclusions implied by exit code 0.
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