In my project at work, the front end java framework ZKoss I use at work, pulls servlet api jar on its own since its dependency is required for the jar, it was mismatching one i was using. So I had to exclude the jar from zkoss dependency
the below is the ZK’s required jar and I am excluding servlet-api from the dependency and pulling the servlet-api upon my request.
<!-- ZK Spring dependencies servlet-api being excluded--> <dependency> <groupId>org.zkoss.zk</groupId> <artifactId>zkspring-core</artifactId> <version>${zk-spring.version}</version> <exclusions> <exclusion> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> </exclusion> </exclusions> </dependency> <!--This is the one I am pulling from maven's repo --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>${servlet-api.version}</version> </dependency>