Spring sftp - 无法读取文件;嵌套异常是4

Question

我偶尔会在标题中指出异常。有谁知道异常4的含义或记录的位置？我已经查看了与此相关的问题，并且我已经了解到例外2，这显然意味着＆＃34;没有这样的文件＆＃34;和例外3是＆＃34;权限被拒绝＆＃34;。但是，当我得到嵌套异常为4时，没有描述，所以我不确定这意味着什么。它只是一个通用的读取时间吗？这种情况很少发生，并且很难重现，因为我们的一些用户完全没有问题，而有些用户时不时会遇到这个问题。

org.springframework.core.NestedIOException: failed to read file /ftadv:D=IBM-037,C=UTF-8/__'MAIN.FRAME.DATASET'; nested exception is 4:
    at org.springframework.integration.sftp.session.SftpSession.readRaw(SftpSession.java:143)
    at org.springframework.integration.file.remote.session.CachingSessionFactory$CachedSession.readRaw(CachingSessionFactory.java:268)
    at org.springframework.integration.file.remote.session.CachingSessionFactory$CachedSession.readRaw(CachingSessionFactory.java:268)
    at com.my.package.FTPService.ftpStoreAuthData(FTPService.java:166)
    at com.my.package.FTPService.ftpStoreNetAuthData(FTPService.java:59)
    at com.my.package.FTPEndpoint.ftpStoreNetAuthData(FTPEndpoint.java:27)

如果有帮助，请点击此处。

@Configuration
class SftpConfiguration {

    @Inject
    private Environment env;

    SessionFactory<LsEntry> getSftpSessionFactory() {
        DefaultSftpSessionFactory sftpSessionFactory =
                new DefaultSftpSessionFactory(Boolean.parseBoolean(env.getRequiredProperty("sftp.isSharedSession")));
        sftpSessionFactory.setHost(env.getRequiredProperty("sftp.host"));
        sftpSessionFactory.setPort(Integer.parseInt(env.getRequiredProperty("sftp.port")));
        sftpSessionFactory.setUser(env.getRequiredProperty("sftp.id"));
        sftpSessionFactory.setPrivateKey(new FileSystemResource(env.getRequiredProperty("sftp.keyPath")));
        sftpSessionFactory.setPrivateKeyPassphrase(env.getRequiredProperty("sftp.passphrase"));
        sftpSessionFactory.setTimeout(Integer.parseInt(env.getRequiredProperty("sftp.timeout")));
        sftpSessionFactory.setAllowUnknownKeys(Boolean.parseBoolean(env.getRequiredProperty("sftp.allowUnknownKeys")));
        return new CachingSessionFactory<LsEntry>(sftpSessionFactory);
    }

    CachingSessionFactory getCachingSessionFactory(){
        CachingSessionFactory cachingSessionFactory = new CachingSessionFactory(getSftpSessionFactory());
        cachingSessionFactory.setSessionWaitTimeout(Integer.parseInt(env.getRequiredProperty("sftp.sessionWaitTimeout")));
        cachingSessionFactory.setPoolSize(Integer.parseInt(env.getRequiredProperty("sftp.poolSize")));
        return cachingSessionFactory;
    }
}

以下是调用代码的示例：

@Service
class FTPService {
    private static final org.apache.logging.log4j.Logger logger = LogManager.getLogger(FTPEndpoint.class);

    private CachingSessionFactory cachingSessionFactory;
    private String adviceString;

    @Inject
    private FTPService(SftpConfiguration sftpConfig) {
        this.cachingSessionFactory = sftpConfig.getCachingSessionFactory();
        this.adviceString = sftpConfig.getAdviceString();
    }

    private String ftpStoreAuthData() {
        Session session = this.cachingSessionFactory.getSession();
        String mainframeDataSet = "'MAIN.FRAME.DATASET'";

        try(BufferedInputStream inputStream =  new BufferedInputStream(session.readRaw(adviceString + mainframeDataSet));
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))
        {
             Stream<String> lines = reader.lines());
             return doThingsWithFTPData(lines);
        } catch (IOException ex) {
            LogException.writeToFile(ex.getMessage(),ex.getStackTrace(), env.getProperty("sftp.exceptionsPath"));
        }finally {
            try {
                if (session.isOpen()) {
                    session.finalizeRaw();
                    session.close();
                }
            }catch (IOException ioe){
                System.out.println(ioe.getLocalizedMessage() + ioe.getCause().toString());
                LogException.writeToFile(ioe.getMessage(),ioe.getStackTrace(), env.getProperty("sftp.exceptionsPath"));
                throw new IOException();
            }
        }
        return "test";
    }
}