Problem with project redeploying


I newbie in Java and I learning it creating a small project with help of  Vaadin, JPA, GlassFish. If I run my project on GlassFish server it starts successfully. But then each time when I push Redeploy, it crashes with error:

javax.servlet.ServletException: java.lang.IllegalArgumentException: No [EntityType] was found for the key class [entity.Category] in the Metamodel - please verify that the [Entity] class was referenced in persistence.xml using a specific <class>entity.Category</class> property or a global <exclude-unlisted-classes>false</exclude-unlisted-classes> element

So I have to stop GlassFish server, change code and run GlassFish again. I takes so much time :(

Maybe someone can help me?

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