slint-ui/slint · error

Java compilation failed: {}

Error message

Java compilation failed: {}

What it means

Error "Java compilation failed: {}" thrown in slint-ui/slint.

Source

Thrown at internal/backends/android-activity/build.rs:55

    let o = JavaBuild::new()
        .file(&java_src_path)
        .class_path(&android_jar)
        .classes_out_dir(&out_class_dir)
        .java_source_version(8)
        .java_target_version(8)
        .debug_info(android_build::DebugInfo {
            line_numbers: !release_mode,
            variables: !release_mode,
            source_files: !release_mode,
        })
        .command()
        .unwrap_or_else(|e| panic!("Could not generate the java compiler command: {e}"))
        .args(["-encoding", "UTF-8"])
        .output()
        .unwrap_or_else(|e| panic!("Could not run the java compiler: {e}"));

    if !o.status.success() {
        panic!("Java compilation failed: {}", String::from_utf8_lossy(&o.stderr));
    }

    let o = Dexer::new()
        .android_jar(&android_jar)
        .class_path(&out_class_dir)
        .collect_classes(&out_class_dir)
        .unwrap()
        .release(release_mode)
        .android_min_api(20) // disable multidex for single dex file output
        .out_dir(out_dir)
        .command()
        .unwrap_or_else(|e| panic!("Could not generate the D8 command: {e}"))
        .output()
        .unwrap_or_else(|e| panic!("Error running D8: {e}"));

    if !o.status.success() {
        eprintln!("Dex conversion failed: {}", String::from_utf8_lossy(&o.stderr));
        let java_home = android_build::java_home().unwrap();

View on GitHub (pinned to 3fd8f2ec03)

Solutions

1. Fix the Java compilation error printed with the error message.
2. Verify the JDK version used by the Android build matches the required version.

When it happens

Trigger: Thrown at internal/backends/android-activity/build.rs:55 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of slint-ui/slint@3fd8f2ec03 (2026-08-19). Data as JSON: /api/errors/fb64ff00a3d9d6c9. Report an issue: GitHub.