Establish the actual toolchain
Run the project's wrapper from the project root:
./gradlew --version
./gradlew help --stacktrace
Record Gradle, JVM and operating-system details. Android Studio can use a different Gradle JDK from the shell's JAVA_HOME; the JDK configuration guide explains that distinction.
Classify the first error
| Error family | First check |
|---|---|
| Unsupported JVM or class-file version | JDK compatibility with Gradle and AGP |
| Plugin cannot be resolved | Plugin ID, version and plugin repositories |
| Dependency download failure | Repository availability, credentials and network policy |
| Unknown DSL property | Plugin version and script language/context |
| SDK path or platform missing | Installed SDK and local configuration |
Do not combine five unrelated fixes at once. Change one relevant input and preserve the before/after error so the cause remains clear.
Check compatibility rather than “latest everything”
The AGP compatibility reference specifies supported toolchain relationships. A new Gradle version may be newer than the minimum without being the right choice for an older plugin. Follow the selected plugin's documented range and migration notes.
Use the Gradle Wrapper so local and CI builds run the intended distribution rather than a globally installed version.
Treat cache deletion as a diagnosis, not a ritual
A corrupt download can justify a targeted retry or cache repair. A syntax error or incompatible JDK will not be fixed permanently by deleting the entire Gradle cache. Broad deletion also removes useful evidence and makes every dependency download again.
Verify the fix outside the IDE
Once sync succeeds, run the relevant build and tests through the wrapper. APKLint's Build Analyzer can help review pasted configuration and errors, but it cannot reproduce private repositories or your machine's JDK setup. Retain the exact error and toolchain tuple with the fix.
Diagnose an IDE-only sync failure
Suppose the wrapper's command-line help task succeeds but Android Studio sync fails with a Java compatibility error. Compare the Gradle JDK selected by the IDE with the JVM reported by the shell invocation. The source language level in a module is a separate setting; changing Java source compatibility does not change the JVM that launches Gradle. Android's JDK guide explains these distinct roles.
Choose a JVM supported by the project's Gradle and Android plugin combination, then apply that choice consistently in the IDE and CI. Re-run sync and the same command-line task. If the error remains, preserve its first relevant cause and confirm that the new setting took effect. An old daemon or a different project root can make the observed runtime differ from the setting you just edited.
Distinguish resolution from compilation
For a repository failure, record whether Gradle could reach the server, authenticate and locate the exact requested artifact. An HTTP rejection, a missing version and a TLS trust failure require different corrections. Avoid adding unrelated public repositories until a library happens to resolve; that can change dependency provenance and conceal the original configuration problem.
Use the project's approved proxy, certificate and credential configuration. Do not turn off certificate validation to get a green sync. If a private repository works on one workstation, check whether that machine has cached the dependency or holds a local credential that CI lacks. Test through a fresh authorized resolution path before describing the repository issue as repaired.
Once configuration succeeds, build the affected module and run its tests. Sync imports the model; it does not exercise every compiler, resource-processing or packaging task. Keep a compact repair record such as “IDE used unsupported JVM; changed Gradle runtime to the supported JDK; wrapper help and release assembly passed.” This identifies a cause and an observed result without claiming that unrelated SDK paths or private integrations were tested. If a second independent error appears afterward, treat it as a separate failure rather than undoing the verified first correction.
Sources and further reading
- Android Developers: Java versions in Android builds
- Android Developers: Current Android Gradle plugin release notes
- Gradle: Gradle Wrapper
Reference review: 29 September 2026. Examples illustrate the workflow; check your installed versions, release artifact and account-specific Console requirements before applying them. This guide is not a claim that APKLint executed your project or verified your private account.
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