{"record":{"id":"ba695a075e2efa5d","repo":"slint-ui/slint","slug":"could-not-generate-the-d8-command-e","errorCode":null,"errorMessage":"Could not generate the D8 command: {e}","messagePattern":"Could not generate the D8 command: (.+?)","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/backends/android-activity/build.rs","lineNumber":67,"sourceCode":"        .unwrap_or_else(|e| panic!(\"Could not generate the java compiler command: {e}\"))\n        .args([\"-encoding\", \"UTF-8\"])\n        .output()\n        .unwrap_or_else(|e| panic!(\"Could not run the java compiler: {e}\"));\n\n    if !o.status.success() {\n        panic!(\"Java compilation failed: {}\", String::from_utf8_lossy(&o.stderr));\n    }\n\n    let o = Dexer::new()\n        .android_jar(&android_jar)\n        .class_path(&out_class_dir)\n        .collect_classes(&out_class_dir)\n        .unwrap()\n        .release(release_mode)\n        .android_min_api(20) // disable multidex for single dex file output\n        .out_dir(out_dir)\n        .command()\n        .unwrap_or_else(|e| panic!(\"Could not generate the D8 command: {e}\"))\n        .output()\n        .unwrap_or_else(|e| panic!(\"Error running D8: {e}\"));\n\n    if !o.status.success() {\n        eprintln!(\"Dex conversion failed: {}\", String::from_utf8_lossy(&o.stderr));\n        let java_home = android_build::java_home().unwrap();\n        let java_ver = android_build::check_javac_version(&java_home).unwrap();\n        if java_ver >= 21 {\n            eprintln!(\"WARNING: JDK version 21 is known to cause an error with older android SDK\");\n            eprintln!(\"See https://github.com/slint-ui/slint/issues/4973\");\n            eprintln!(\n                \"Try downgrading your version of Java to something like JDK 17, or upgrade to the SDK build tools 35\"\n            );\n        }\n        panic!(\"Dex conversion failed\");\n    }\n\n    println!(\"cargo:rerun-if-changed={java_src_path}\");","sourceCodeStart":49,"sourceCodeEnd":85,"githubUrl":"https://github.com/slint-ui/slint/blob/3fd8f2ec03c2aa8a95d5f4b9daa299c7b8bf4016/internal/backends/android-activity/build.rs#L49-L85","documentation":"Error \"Could not generate the D8 command: {e}\" thrown in slint-ui/slint.","triggerScenarios":"Thrown at internal/backends/android-activity/build.rs:67 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Install the Android SDK build-tools containing d8 and set ANDROID_HOME.","Check that the d8 path detected by the build script exists."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3fd8f2ec03c2aa8a95d5f4b9daa299c7b8bf4016","analyzedAt":"2026-08-19T23:23:16.610Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}