The auto downloaded maven dependencies ( vaadin-core-13.0.0, flow-server-1.4.2, gwt-elemental etc)for vaadin in my spring boot application is being reported as error or invalid zip file by eclipse in my machine. It would be helpful if someone could suggest some solution for this.
Sounds like something went wrong when downloading the dependencies.
You can run
mvn com.github.s4u.plugins:pgpverify-maven-plugin:check
to validate all the dependencies used by the current project. Then delete any broken files from the Maven cache (~/.m2) and run mvn install or similar to make Maven download them again.