为什么RouteInfoManager.java使用嵌套try。。。接住

正如主题所说。我不知道为什么代码使用嵌套try。。。catch，可能是因为解锁操作会引发异常？ 示例代码如下：

现在的代码：

public byte[] getAllTopicList() {
    TopicList topicList = new TopicList();
    try {
        try {
            this.lock.readLock().lockInterruptibly();
            topicList.getTopicList().addAll(this.topicQueueTable.keySet());
        } finally {
            this.lock.readLock().unlock();
        }
    } catch (Exception e) {
        log.error("getAllTopicList Exception", e);
    }

    return topicList.encode();
}

期待如下：

public byte[] getAllTopicList() {
    TopicList topicList = new TopicList();
    try {
        this.lock.readLock().lockInterruptibly();
        topicList.getTopicList().addAll(this.topicQueueTable.keySet());
    } catch (Exception e) {
        log.error("getAllTopicList Exception", e);
    } finally {
        this.lock.readLock().unlock();
    }
    return topicList.encode();
}

原提问者GitHub用户shenshaoming c