I encountered this problem because the JDK memory and Tomcat I configured were not large enough, so the project ran with an error. I solved this problem through configuration.
JDK configuration memory size
-Xms500m -Xmx1024m -XX:NewSize=800m -XX:MaxPermSize=800m
Run eclipse normally, open window preferences Java, and the page window will pop up
Tomcat configuration is divided into two steps
The first step is to configure in eclipse
-Xms500m -Xmx1024m -XX:NewSize=256m -XX:MaxPermSize=512m
Find the path to configure and install tomcat, enter the bin file, and install Tomcat 7 by myself
-Xms500m
-Xmx1024m
-XX:PermSize=64M
-XX:MaxPermSize=256m
-XX:ReservedCodeCacheSize=48m
– Duser.timezone=GMT +08
After the configuration is completed, there is no error in running the project! Problem solving