{"record":{"id":"fd459628401cc8a6","repo":"hashicorp/nomad","slug":"failed-to-check-java-version-v","errorCode":null,"errorMessage":"failed to check java version: %v","messagePattern":"failed to check java version: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"drivers/java/utils.go","lineNumber":38,"sourceCode":"\tvar out bytes.Buffer\n\tcmd := exec.Command(macOSJavaTestCommand)\n\tcmd.Stdout = &out\n\tcmd.Stderr = &out\n\terr = cmd.Run()\n\tif err != nil {\n\t\terr = fmt.Errorf(\"failed check for macOS jvm: %v, out: %v\", err, strings.ReplaceAll(strings.ReplaceAll(out.String(), \"\\n\", \" \"), `\"`, `\\\"`))\n\t\treturn false, err\n\t}\n\treturn true, nil\n}\n\nfunc javaVersionInfo() (version, runtime, vm string, err error) {\n\tvar out bytes.Buffer\n\n\tif rt.GOOS == \"darwin\" {\n\t\t_, err = checkForMacJVM()\n\t\tif err != nil {\n\t\t\terr = fmt.Errorf(\"failed to check java version: %v\", err)\n\t\t\treturn\n\t\t}\n\t}\n\n\tcmd := exec.Command(javaVersionCommand[0], javaVersionCommand[1:]...)\n\tcmd.Stdout = &out\n\tcmd.Stderr = &out\n\terr = cmd.Run()\n\tif err != nil {\n\t\terr = fmt.Errorf(\"failed to check java version: %v\", err)\n\t\treturn\n\t}\n\n\tversion, runtime, vm = parseJavaVersionOutput(out.String())\n\treturn\n}\n\nvar (","sourceCodeStart":20,"sourceCodeEnd":56,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/drivers/java/utils.go#L20-L56","documentation":"javaVersionInfo runs the java -version command (and on macOS first checks for a JVM) to learn version/runtime/VM for fingerprinting and compatibility checks. When the macOS JVM probe itself fails, the underlying checkForMacJVM error is re-wrapped with this generic message. The wrapped 'failed check for macOS jvm' error carries the root cause and probe output.","triggerScenarios":"Calling buildFingerprint or javaCompatible on a darwin client when checkForMacJVM's probe command exits non-zero — typically no JDK installed on the Mac.","commonSituations":"Mac dev/CI machines without Java; fingerprinting a newly joined Nomad macOS client; JAVA_HOME broken after OS/java upgrade so the probe fails.","solutions":["Install a JDK on the macOS client so the java_home probe succeeds.","Inspect the inner 'failed check for macOS jvm: ..., out: ...' message for the probe's actual output.","Run /usr/libexec/java_home manually to confirm it exits 0."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"if runtime.GOOS == \"darwin\" {\n    out, err := exec.Command(\"/usr/libexec/java_home\").Output()\n    if err != nil {\n        return fmt.Errorf(\"install a JDK on this Mac first: %v (%s)\", err, out)\n    }\n}","typeGuard":null,"tryCatchPattern":"version, runtime_, vm, err := javaVersionInfo()\nif err != nil {\n    if strings.Contains(err.Error(), \"macOS jvm\") {\n        // root cause: JVM probe failed; see inner checkForMacJVM message\n    }\n    return err\n}","preventionTips":["Keep a valid JDK installed on all macOS clients used for java tasks.","Watch fingerprint health so driver unhealthiness is caught before job submission.","Unwrap the error chain to read the probe output embedded by checkForMacJVM."],"tags":["nomad","java-driver","macos","java-version","fingerprint"],"backgroundTag":"jvm-not-detected","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}