javax.servlet.ServletException: loader constraints violated when linking org/xml/sax/XMLReader class

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javax.servlet.ServletException: loader constraints violated when linking org/xml/sax/XMLReader class
at weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubImpl.java:906)
at weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStubImpl.java:842)
at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:782)
at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:3191)

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