我制作了一个Java程序来完成对xml的签名，因为我无法通过c ++获取Signature值，通过cmd运行可以正常工作，但是使用QProcess时出现以下错误

    QProcess processAssinar;
    processAssinar.start("java -jar " + qApp->applicationDirPath() + "/nfsigner.jar " + pathCertificado + " " + senhaCertificado + " " + xmlFile.fileName());
    processAssinar.waitForFinished(10000);

    qDebug() << processAssinar.arguments();

    if(processAssinar.exitCode() != 0){
        QMessageBox::critical(nullptr,"NF","Falha ao assinar a nota fiscal");
        qCritical() << processAssinar.readAllStandardError();
        return;
    }

错误：

"java.lang.UnsupportedClassVersionError: com/ivesti/nfsigner/NFSigner : Unsupported major.minor version 52.0\r\n\tat java.lang.ClassLoader.defineclass1(Native Method)\r\n\tat java.lang.ClassLoader.defineclass(Unknown Source)\r\n\tat java.security.SecureclassLoader.defineclass(Unknown Source)\r\n\tat java.net.URLClassLoader.defineclass(Unknown Source)\r\n\tat java.net.URLClassLoader.access$100(Unknown Source)\r\n\tat java.net.URLClassLoader$1.run(Unknown Source)\r\n\tat java.net.URLClassLoader$1.run(Unknown Source)\r\n\tat java.security.accessController.doPrivileged(Native Method)\r\n\tat java.net.URLClassLoader.findClass(Unknown Source)\r\n\tat java.lang.ClassLoader.loadClass(Unknown Source)\r\n\tat sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)\r\n\tat java.lang.ClassLoader.loadClass(Unknown Source)\r\n\tat sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)\r\nException in thread \"main\" "