java log4j: log4j:ERROR Attempted to append to closed appender named [stdout] log4j: log4j:ERROR Attempted to append to closed append…
jekyll jekyll Could not load Bundler. Bundle install skipped. 安装 Jekyll 的时候出现错误，提示 Could not load Bundler. Bundle ins…
Kafka kafka [B cannot be cast to java.lang.String 自己写了一个 Kafka 发送消息的 demo，但是发送消息的时候，却报了 kafka [B cannot b…
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