It feels like the tomcat class library is not found. I also think it would be better to change to tomcat instead of using the one that comes with the IDE.
I use the intelliJ idea compiler, and my classmate uses eclipse. I heard him say that eclipse is not compatible with tomcat8.5, and the highest is only 8.0. He had already changed idea last night.
Then if it is tomcat9, it seems to be a problem with tomcat itself. I also ran it and deployed it to the server.
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Try another Tomcat instead of using the Tomcat that comes with MyEclipse...
It feels like the tomcat class library is not found. I also think it would be better to change to tomcat instead of using the one that comes with the IDE.
I use the intelliJ idea compiler, and my classmate uses eclipse. I heard him say that eclipse is not compatible with tomcat8.5, and the highest is only 8.0. He had already changed idea last night.
Then if it is tomcat9, it seems to be a problem with tomcat itself. I also ran it and deployed it to the server.