HTTP Status 500 – Internal Server Error


Type Exception Report

Message Cannot invoke "String.replace(java.lang.CharSequence, java.lang.CharSequence)" because the return value of "javax.servlet.http.HttpServletRequest.getHeader(String)" is null

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

java.lang.NullPointerException: Cannot invoke "String.replace(java.lang.CharSequence, java.lang.CharSequence)" because the return value of "javax.servlet.http.HttpServletRequest.getHeader(String)" is null
	controller.LangServlet.doGet(LangServlet.java:25)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

Note The full stack trace of the root cause is available in the server logs.


Apache Tomcat/9.0.54