Cannot resolve method 'sendMessage(java.util.Optional<com.toyo.mes.domain.User>, java.lang.String, java.lang.String)'

这个错误提示意味着在你的代码中，存在一个方法调用 `sendMessage`，但是该方法的参数类型与你所提供的不匹配。具体来说，该方法接收三个参数：一个 `Optional<User>` 对象，一个字符串和另一个字符串，但你提供的参数类型可能与之不同。

要解决这个问题，你需要检查方法调用的参数类型和数量是否与该方法的定义一致。如果不一致，可以修改调用代码以匹配方法定义，或者修改该方法的定义以接受提供的参数类型。如果你无法解决这个问题，可以提供更多的代码和错误信息，以便我能够帮助你更好地解决问题。

相关问题

Cannot resolve method 'thenReturn(java.util.HashMap<java.lang.String,java.util.Set<java.lang.String>>)

This error message typically occurs in Java unit testing when the method `thenReturn` is called with an incorrect parameter type.

In this case, the error message indicates that the method `thenReturn` is being called with a `HashMap<String, Set<String>>` parameter type, but this is not the correct type for this method.

The `thenReturn` method is typically used in unit testing to create a mock object that returns a specific value when a certain method is called. In order to use this method correctly, you need to specify the correct return value type for the method you are mocking.

To fix this error, you should check the documentation for the method you are mocking and make sure that you are using the correct return value type for the `thenReturn` method. If you are unsure of the correct type to use, you may need to consult with a Java developer or consult the Java documentation for further guidance.