com.jcraft.jsch.JSchException：SFTP流入站通道适配器不会关闭会话

Question

使用SFTP流入站通道适配器时，会话似乎未关闭。当适配器耗尽sftp服务器上可用的会话时，spring会抛出com.jcraft.jsch.JSchException。

当RemoteFileTemplate在服务器上执行ls时，我看到它打开并关闭了会话，但是，当AbstractRemoteFileStreamingMessageSource执行doReceive时，我看不到对关闭会话。这可能是我的错误配置。

以下是我的配置：

    @Bean
    public SessionFactory<ChannelSftp.LsEntry> sftpSessionFactory() {
        DefaultSftpSessionFactory factory = new DefaultSftpSessionFactory(true);
        factory.setHost(properties.getHost());
        factory.setPort(properties.getPort());
        factory.setUser(properties.getUsername());
        factory.setPassword(properties.getPassword());

        CachingSessionFactory cachingSessionFactory = new CachingSessionFactory<>(factory);

        return cachingSessionFactory;
    }

    @Bean
    public SftpRemoteFileTemplate template() {
        return new SftpRemoteFileTemplate(sftpSessionFactory());
    }

    @Bean
    @InboundChannelAdapter(channel = "sftpChannel", poller = @Poller(cron = "0/5 * * * * *", maxMessagesPerPoll = "10"))
    public MessageSource<InputStream> sftpMessageSource(ConcurrentMetadataStore concurrentMetadataStore) {
        ChainFileListFilter<ChannelSftp.LsEntry> filterChain = new ChainFileListFilter<>();
        if (properties.getFilterPattern() != null && !"".equals(properties.getFilterPattern()))
            filterChain.addFilter(new SftpRegexPatternFileListFilter(properties.getFilterPattern()));
        filterChain.addFilter(new SftpPersistentAcceptOnceFileListFilter(concurrentMetadataStore, "sftpSource"));
        SftpStreamingMessageSource messageSource = new SftpStreamingMessageSource(template());
        messageSource.setRemoteDirectory(properties.getRemoteDirectory());
        messageSource.setFilter(filterChain);

        return messageSource;
    }

    @Bean
    @ServiceActivator(inputChannel = "sftpChannel")
    public MessageHandler handler(SftpDocumentInput sftpDocumentInput) {
        return sftpDocumentInput;
    }

感谢您的帮助！