Servlet.service() for servlet [dispatcherServlet] in context with path [/demo] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.lang.NumberFormatException: For input string: "2023-06-01 00:00:00" ### Cause: java.lang.NumberFormatException: For input string: "2023-06-01 00:00:00"] with root cause 什么原因

根据异常信息，可以看出是因为在查询数据库时，出现了数据类型转换异常，具体是因为将字符串"2023-06-01 00:00:00"转换成数字时出现了异常，因为该字符串不是一个有效的数字格式。可能是在进行日期时间类型的比较或排序时，将日期时间类型的值转换成了数字类型导致的异常。需要检查相应的数据库查询语句和数据类型定义，确保数据类型的一致性和正确性。

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Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception

根据提供的引用内容， Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is （这里是包名）] with root cause. Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause.和44.892 ERROR 13764 --- [nio-8081-exec-9] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed;... ，我可以告诉你的是这是一个关于Servlet的异常信息。具体来说，是当在处理请求时，由于某种原因导致了异常。异常的具体原因可能是包名（引用中的内容），也可能是java.lang.NullPointerException（引用中的内容）。这个异常信息表明在处理请求时发生了错误，导致请求处理失败（引用中的内容）。根据提供的信息，无法确定具体的异常原因，需要进一步的调查和排查才能确定问题的根本原因。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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r servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested e

异常信息是Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.suntang.common.exception.RRException: 用户账号已被占用] with root cause。造成这个异常的原因是用户账号已被占用。
另外，还有一个异常信息是Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed;...].这可能是由于URL不存在或与项目的根路径冲突导致的。因此，需要检查URL是否正确匹配。
还有一个异常信息是Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost/8081:user/1": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect] with root cause java.net.ConnectException: Connection refused: connect。这个异常可能是由于连接被拒绝导致的，可能是因为URL不存在或无法连接到指定的地址。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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