java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at weblogic.servlet.internal.session.SessionData.reuseSessionId(SessionData.java:215)
at weblogic.servlet.internal.session.SessionData.(SessionData.java:133)
at weblogic.servlet.internal.session.MemorySessionData.(MemorySessionData.java:9)
at weblogic.servlet.internal.session.MemorySessionContext.getNewSession(MemorySessionContext.java:21)
at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getNewSession(ServletRequestImpl.java:3274)
at weblogic.servlet.internal.ServletRequestImpl$SessionHelper._getSessionInternal(ServletRequestImpl.java:2746)
at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSessionInternal(ServletRequestImpl.java:2702)
at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.getSession(ServletRequestImpl.java:2692)
at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:255)
at jsp_servlet.__login._jspService(__login.java:23)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:35)

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