求大神看看这是什么问题 internal error that prevented it from fulfilling this request.

type Exception report

message

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
oa.utils.Utils.sendPost(Utils.java:212)
oa.utils.Utils.noticeDocument(Utils.java:174)
oa.servlet.receive.CompleteDocumentServlet.service(CompleteDocumentServlet.java:56)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
oa.servlet.EncoodingFilter.doFilter(EncoodingFilter.java:46)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.68 logs.

Apache Tomcat/7.0.68

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