Before, Tomcat startup always reported errors. Although it does not affect the startup and operation of the project, programmers with obsessive-compulsive disorder will be unhappy: 
The problem is caused by the inconsistency between the JDK version installed locally and the JDK version used in Tomcat
Later, I changed the jdk1.7 used in the original Tomcat startup environment to the JDK1.8 installed locally, so I won’t report an error
Specific process: in MyEclipse, click window → preference → enter Tomcat in the search box → select the installed Tomcat version. Here, I select Tomcat 7. X → click JDK → in Tomcat 7. X JDK Name: select the JDK version installed in this machine from the drop-down option → click OK, and then start Tomcat again to avoid any error
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