Yesservlet-api.jar, servlet abstracts the HTTP protocol and is one of the Java EE APIs. Usually a complete web program also requires the support of JDBC driver, which Tomcat does not come with, because it depends on the database you use. Each database has its own driver.
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Check if you have similar libraries elsewhere.
It seems that eclipse comes with J2EE libraries, but other developers don’t know much about it
Yes
servlet-api.jar, servlet abstracts the HTTP protocol and is one of the Java EE APIs. Usually a complete web program also requires the support of JDBC driver, which Tomcat does not come with, because it depends on the database you use. Each database has its own driver.