equest processing failed; nested exception is java.lang.IllegalStateException: getWriter() has already been called for this response

回答: 这个错误是由于在前端的.jsp文件格式或者语法非法导致的。具体来说，在这种情况下，服务器已经调用了`getWriter()`方法来返回response，然后又尝试再次调用该方法，从而导致了这个错误。要解决这个问题，我们需要仔细检查我们的.show.jsp文件，确保其中没有重复调用`getWriter()`方法的情况。同时，我们也可以检查一下是否有其他语法错误或者格式非法的地方。希望这个解答能对你有帮助！

相关问题

equest processing failed; nested exception is org.apache.dubbo.rpc.RpcException: Fail to invoke remote method

As an AI language model, I am not able to provide the specific solution for this error message without additional context. However, generally speaking, this error message indicates that there was an issue with the request processing during a remote method invocation using the Apache Dubbo RPC framework.

This error could be caused by a variety of factors such as network connectivity issues, incorrect configuration settings, or even server-side issues. To resolve this issue, it's important to analyze the error logs and trace the root cause of the problem. You may also need to consult the documentation or seek assistance from the community or support team for the specific application or service that is using the Dubbo RPC framework.

equest processing failed: org.apache.ibatis.exceptions.PersistenceException:

根据提供的引用内容，可以看出这是一个请求处理失败的异常，其中嵌套了MyBatis和Spring框架的异常。而org.apache.ibatis.exceptions.PersistenceException是MyBatis框架中的异常，通常是由于SQL语句执行失败或者映射文件配置错误等原因导致的。因此，需要检查SQL语句和映射文件是否正确配置，以及数据库连接是否正常等问题。

如果SQL语句和映射文件都正确配置，可以尝试打开MyBatis的日志输出，查看具体的错误信息。在MyBatis的配置文件中，可以添加如下配置来开启日志输出：

<configuration>
  <settings>
    <setting name="logImpl" value="STDOUT_LOGGING"/>
  </settings>
</configuration>

此外，还可以通过调整日志级别来获取更详细的日志信息。在log4j.properties文件中，可以添加如下配置：

log4j.logger.org.apache.ibatis=DEBUG

这样就可以将MyBatis的日志级别调整为DEBUG，获取更详细的日志信息。