{"record":{"id":"1176f30bd56c79d2","repo":"oracle/graal","slug":"attachcurrentthread-failed-to-attached-to-isolate","errorCode":null,"errorMessage":"AttachCurrentThread: failed to attached to isolate","messagePattern":"AttachCurrentThread: failed to attached to isolate","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"espresso/src/com.oracle.truffle.espresso.mokapot/src/mokapot.c","lineNumber":1955,"sourceCode":"        return lib_javavm;\n    }\n    if (type == LIB_JAVAVM_POLYGLOT) {\n        if (lib_polyglot == NULL) {\n            lib_polyglot = load_libjavavm(LIB_POLYGLOT_PATH);\n        }\n        return lib_polyglot;\n    }\n    return NULL;\n}\n\njint AttachCurrentThread_helper(JavaVM *vm, void **penv, void *args, jint (JNICALL *attach_method)(JavaVM *vm, void **penv, void *args)) {\n    JavaVM *espressoJavaVM = (*vm)->reserved2;\n    LibJavaVMIsolate *espressoIsolate = (*vm)->reserved0;\n    graal_isolate_t *isolate = espressoIsolate->isolate;\n    LibJavaVM *libjavavm = espressoIsolate->lib;\n    graal_isolatethread_t *thread;\n    if (libjavavm->attach_thread(isolate, &thread) != 0) {\n        fprintf(stderr, \"AttachCurrentThread: failed to attached to isolate\" OS_NEWLINE_STR);\n        return JNI_ERR;\n    }\n    // we must first attach to the polyglot context:\n    // (*espressoJavaVM)->AttachCurrentThread is a NFI closure from this context\n    // and only works correctly if we are attached.\n    jint ret = libjavavm->Espresso_EnterContext(thread, (struct JavaVM_ *)espressoJavaVM);\n    if (ret != JNI_OK) {\n        fprintf(stderr, \"AttachCurrentThread: failed to attached to polyglot context\" OS_NEWLINE_STR);\n        return ret;\n    }\n    ret = attach_method(espressoJavaVM, penv, args);\n    if (ret != JNI_OK) {\n        fprintf(stderr, \"AttachCurrentThread: failed to attached to Espresso\" OS_NEWLINE_STR);\n        libjavavm->detach_thread(thread);\n    }\n    return ret;\n}\n","sourceCodeStart":1937,"sourceCodeEnd":1973,"githubUrl":"https://github.com/oracle/graal/blob/a66e9ccd1d7bf2552883939aa0788dfd0e294aab/espresso/src/com.oracle.truffle.espresso.mokapot/src/mokapot.c#L1937-L1973","documentation":"Error \"AttachCurrentThread: failed to attached to isolate\" thrown in oracle/graal.","triggerScenarios":"Thrown at espresso/src/com.oracle.truffle.espresso.mokapot/src/mokapot.c:1955 when the library encounters an invalid state.","commonSituations":"Occurs when a caller violates the contract guarded by this check: AttachCurrentThread: failed to attached to isolate","solutions":["Fix the condition reported by the error: AttachCurrentThread: failed to attached to isolate","Check the throwing call site and ensure its documented preconditions (argument values, types, environment, or configuration) are satisfied before the call."],"exampleFix":"Validate inputs and environment so that the failing condition does not occur: AttachCurrentThread: failed to attached to isolate","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"a66e9ccd1d7bf2552883939aa0788dfd0e294aab","analyzedAt":"2026-08-14T13:58:47.161Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}