Phenomenon: 1. There is no exception when the project starts, when the page is loaded into the spring:message In the background, the null pointer is abnormal, and the console will display the prompt with root cause;

2. Note out spring:message After related tags, there is no exception, but where the specific content should be displayed, the code value in the tag is displayed;

3. The same project can be used on other people’s computers, but not on my computer;

4. Available on eclipse, not on MyEclipse;

Reason: there is a space in the Tomcat installation path;

Solution: put the Tomcat of the deployment project in a path without spaces, such as the root directory.

The above are the phenomena and solutions I encountered. If there are any other phenomena and solutions, please add.