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This way all registered ISessionListeners will be notified when a Session is unbound.

(Base)WicketTester uses org.junit.Assert instead of junit.framework.Assert

junit.framework.Assert is deprecated. Due to this change org.junit.Assert#fail() throws now java.lang.AssertionError instead of junit.framework.AseertionFailedError

org.apache.wicket.Component#setMetaData() value could be only a Serializable WICKET-5227

Component and Session's meta data must be serializable.

Behavior changes

org.apache.wicket.request.Url#getQueryString WICKET-4664

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