nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to 127.0.0.1:6379] with root cause

根据你提供的引用内容，nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to 127.0.0.1:6379] with root cause是一个Redis连接异常，无法连接到127.0.0.1:6379。解决这个问题的方法有以下几种：
1. 检查redis.conf文件：使用编辑器（如vim）打开redis.conf文件（通常位于/etc/redis.conf），查看是否有配置错误或者连接设置不正确的问题。可以搜索关键词来查找相关配置。
2. 检查密码设置：如果之前设置了密码但没有输入密码直接启动Redis，可能导致连接失败。确保输入正确的密码后再次启动Redis。
3. 检查内存限制：如果出现nested exception is java.lang.OutOfMemoryError Java heap space的问题，说明Java堆空间不足。解决这个问题可以通过增加Java虚拟机的堆空间大小，可以通过-Xmx参数来设置堆空间的最大值。例如，使用java -Xmx2G来设置堆空间的最大值为2GB。

希望以上方法对你解决问题有所帮助。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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