message Request processing failed; nested exception is java.lang.NullPointerException
数据查询的时候，在查询方法调用的时候抛出异常，根本就没进去方法里卖弄，所以这时候如果确认查询语句没错的话，一般就是调用这个方法的对象没有@autowire
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Servlet.service() for servlet [gCmsFront] in context with path [/cms] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPoi
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解决报错 Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException
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Exception in thread "main" java.lang.NullPointerException
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JAVA错误：Exception in thread "main" java.lang.NullPointerException