While configuring vaadin environment on eclipse IDE, somelibrary.jar missing is the common error we can see. Some times you can find these libraries from eclipse it self(Eclipse downloads them automatically). Most commonly missing libraries are
gwt-dev.jar: eclipse\configuration\com.vaadin.integration.eclipse\download\gwt-dev\2.3.0
gwt-user.jar : eclipse\configuration\com.vaadin.integration.eclipse\download\gwt-user\2.3.0
validation-api-1.0.0.GA.jar. : eclipse\configuration\com.vaadin.integration.eclipse\download\gwt-dependencies\2.3.0
validation-api-1.0.0.GA-sources.jar : eclipse\configuration\com.vaadin.integration.eclipse\download\gwt-dependencies\2.3.0
Find these four libraries from eclipse, if you are not able to find out these files then you can google them by their name and download all. Keep these four libraries in vaadin\2.3.0 folder. Copy this vaadin folder in path: tomcat-7.0.23\webapps\ROOT\WEB-INF
2. Miss match of Vaadin with local library.
If you use vaadin add-on eclipse, sometimes this add-comes with one version and you might have another version. Or if you like to upgrade your vaadin then just download new vaadin which will having name like Vaadin.6.7.8.jar. Rename this jar file as Vaadin.jar and copy this in
path: tomcat-7.0.23\webapps\ROOT\WEB-INF\lib
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