Various small problems with eclipse

1. When we reinstalled eclipse, but it happened that the location of eclipse did not change. We imported tomcat, and then we reinstalled jdk again. At this time, there would be a problem with our tomcat, and a project could not be added. Then the reason for this problem is that tomcat depends on jdk, but jdk cannot use tomcat because the registry has been changed. The solution is to reconfigure tomcat
2. When we write code, there will be a syntax check, but there are At that time, we obviously modified the code and made a save, but eclipse still gave us an error. At this time, we should consider cleaning the cache.