HttpServlet.service() has thrown a NoClassDefFoundError

We found this prefix in 2 webpages.
MapChildren (2)Typical messages (1)TraceDetailed Map
  1. java.lang.NoClassDefFoundError
    1.   at test.LicenseDemoServlet1.processRequest()
    2.   at test.LicenseDemoServlet1.doGet()
    3.   at javax.servlet.http.HttpServlet.service()
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MessageNumber of crashes
javax/crypto/spec/PBEKeySpec2
  1. java.lang.NoClassDefFoundError
    1.   at test.LicenseDemoServlet1.processRequest()
    2.   at test.LicenseDemoServlet1.doGet()
    3.   at javax.servlet.http.HttpServlet.service()