{"record":{"id":"4b6636fbbbfbf43d","repo":"DioxusLabs/dioxus","slug":"failed-to-get-asset-manager-as-object","errorCode":null,"errorMessage":"Failed to get asset manager as object","messagePattern":"Failed to get asset manager as object","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/asset-resolver/src/native.rs","lineNumber":280,"sourceCode":"    }\n\n    use std::ptr::NonNull;\n\n    let ctx = ndk_context::android_context();\n    let vm = unsafe { jni::JavaVM::from_raw(ctx.vm().cast()) }.unwrap();\n    let mut env = vm.attach_current_thread().unwrap();\n\n    // Query the Asset Manager\n    let asset_manager_ptr = env\n        .call_method(\n            unsafe { jni::objects::JObject::from_raw(ctx.context().cast()) },\n            \"getAssets\",\n            \"()Landroid/content/res/AssetManager;\",\n            &[],\n        )\n        .expect(\"Failed to get asset manager\")\n        .l()\n        .expect(\"Failed to get asset manager as object\");\n\n    unsafe {\n        let asset_manager =\n            ndk_sys::AAssetManager_fromJava(env.get_native_interface(), *asset_manager_ptr);\n\n        let asset_manager = ndk::asset::AssetManager::from_ptr(\n            NonNull::new(asset_manager).expect(\"Invalid asset manager\"),\n        );\n\n        let cstr = std::ffi::CString::new(normalized).unwrap();\n\n        let mut asset = asset_manager.open(&cstr)?;\n        Some(asset.buffer().unwrap().to_vec())\n    }\n}\n","sourceCodeStart":262,"sourceCodeEnd":296,"githubUrl":"https://github.com/DioxusLabs/dioxus/blob/393d190a801ccb441d41923e232289b4f8a5c669/packages/asset-resolver/src/native.rs#L262-L296","documentation":"Second-stage Android JNI panic in to_java_load_asset: the getAssets call itself succeeded, but converting the returned JValue to a Java object with .l() failed because the returned reference was null or not an object.","triggerScenarios":"The Java side returns null/non-object from getAssets, or the context object registered in ndk-context is not the expected Activity/Context type, making the .l() conversion fail.","commonSituations":"Mismatched Android glue where the stored context is an object the JVM cannot resolve getAssets on; API-level or activity-package differences in a custom launcher; incorrect unsafe JNI usage corrupting references.","solutions":["Use the standard dioxus/wry Android entry so the correct Context is registered in ndk-context","Verify the app targets a supported Android API level with the standard Activity","Ensure custom code never overwrites ndk_context with a wrong context pointer"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":["Use the stock dioxus Android entry point; custom JNI glue must register the real Activity context","Verify the app runs on a supported Android API level before debugging asset failures","Keep custom JNI code from replacing the ndk-context global"],"tags":["android","jni","assets","runtime","panic"],"backgroundTag":null,"analyzedSha":"393d190a801ccb441d41923e232289b4f8a5c669","analyzedAt":"2026-08-16T11:27:45.815Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}