servlet [dispatcherServlet] in context with path [] threw exception

引用和提到了servlet [dispatcherServlet在上下文路径为空的情况下抛出了异常。具体的异常信息是org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.zyq.zyq210.UserService.findAll。而引用还提到了另一种异常描述为"java.lang.IllegalArgumentException：Unknown return value type: java.lang.Integer"。基于这些信息，我们可以得出结论，servlet [dispatcherServlet在处理请求时出现了异常。具体来说，异常可能是由于无效的绑定语句或未找到的绑定语句导致的。另外，还可能涉及到返回值类型未知导致的异常。但是由于缺少更多的上下文信息，无法进一步确定异常的具体原因。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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