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java.lang.NullPointerException: 	at edu.apollogrp.fsg.cas.EncryptionUtil.encrypt(EncryptionUtil.java:63)	at edu.apollogrp.fsg.cas.CASClient.getEncodedAndEncryptedStr(CASClient.java:102)	at edu.apollogrp.fsg.cas.CASClient.authenticateCAS(CASClient.java:53)	at oa_html._fndvald._jspService(_fndvald.java:200)	at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)	at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)	at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)	at oracle.jsp.JspServlet.internalService(JspServlet.java:186)	at oracle.jsp.JspServlet.service(JspServlet.java:156)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)	at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)	at org.apache.jserv.JServConnection.run(JServConnection.java:294)	at java.lang.Thread.run(Thread.java:595)