java.lang.RuntimeException: java.io.NotSerializableException: java.lang.ref.WeakReference

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java.io.NotSerializableException: javax.servlet.jsp.jstl.fmt.LocalizationContext
java.lang.RuntimeException: java.io.NotSerializableException: java.lang.ref.WeakReference
at com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:373)

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