{"record":{"id":"3c20a0806325c505","repo":"oracle/graal","slug":"attachcurrentthread-failed-to-attached-to-espress","errorCode":null,"errorMessage":"AttachCurrentThread: failed to attached to Espresso","messagePattern":"AttachCurrentThread: failed to attached to Espresso","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"espresso/src/com.oracle.truffle.espresso.mokapot/src/mokapot.c","lineNumber":1968,"sourceCode":"    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\njint AttachCurrentThread(JavaVM *vm, void **penv, void *args) {\n    if ((*vm)->reserved1 != MOKA_LATTE) {\n        fprintf(stderr, \"AttachCurrentThread: not a MOKA_LATTE\" OS_NEWLINE_STR);\n        return JNI_ERR;\n    }\n    JavaVM *espressoJavaVM = (*vm)->reserved2;\n    return AttachCurrentThread_helper(vm, penv, args, (*espressoJavaVM)->AttachCurrentThread);\n}\n\njint DestroyJavaVM(JavaVM *vm) {\n    if ((*vm)->reserved1 != MOKA_LATTE) {\n        fprintf(stderr, \"DestroyJavaVM: not a MOKA_LATTE\" OS_NEWLINE_STR);\n        return JNI_ERR;","sourceCodeStart":1950,"sourceCodeEnd":1986,"githubUrl":"https://github.com/oracle/graal/blob/a66e9ccd1d7bf2552883939aa0788dfd0e294aab/espresso/src/com.oracle.truffle.espresso.mokapot/src/mokapot.c#L1950-L1986","documentation":"Error \"AttachCurrentThread: failed to attached to Espresso\" thrown in oracle/graal.","triggerScenarios":"Thrown at espresso/src/com.oracle.truffle.espresso.mokapot/src/mokapot.c:1968 when the library encounters an invalid state.","commonSituations":"Occurs when a caller violates the contract guarded by this check: AttachCurrentThread: failed to attached to Espresso","solutions":["Fix the condition reported by the error: AttachCurrentThread: failed to attached to Espresso","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 Espresso","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"a66e9ccd1d7bf2552883939aa0788dfd0e294aab","analyzedAt":"2026-08-14T13:58:47.161Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}