jetty-distribution-9.4.21.v20190926 jre1.8.0_231 Create a HTML form using the POST method :-
<form name="frm" method=post action="http://your_company.com/your_company/cgi-bin/form.pl"; accept-charset="utf-8"> First name: <input type="text" name="fname"><br> Last name: <input type="text" name="lname"><br> <input type="submit" value="Submit"> </form> Submit the form. Jetty throws the following exception :- HTTP ERROR 500 java.lang.IllegalArgumentException: Null charset name URI: /your_company/cgi-bin/form.pl STATUS: 500 MESSAGE: java.lang.IllegalArgumentException: Null charset name SERVLET: CGI CAUSED BY: java.lang.IllegalArgumentException: Null charset name java.lang.IllegalArgumentException: Null charset name at java.nio.charset.Charset.lookup(Charset.java:457) at java.nio.charset.Charset.forName(Charset.java:528) at org.eclipse.jetty.servlets.CGI.exec(CGI.java:254) at org.eclipse.jetty.servlets.CGI.service(CGI.java:217) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:760) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1617) at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:226) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:536) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1589) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1296) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1559) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1211) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:221) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:500) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:386) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:560) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:378) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:268) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:367) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:782) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:914) at java.lang.Thread.run(Thread.java:748) Relevant lines of code from /jetty/servlets/CGI.java were it determines that the POST method was used and calls getCharacterEncoding on the request that results in the above exception :- String bodyFormEncoded = null; if ((HttpMethod.POST.is(req.getMethod()) || HttpMethod.PUT.is(req.getMethod())) && "application/x-www-form-urlencoded".equals(req.getContentType())) { MultiMap<String> parameterMap = new MultiMap<>(); Enumeration<String> names = req.getParameterNames(); while (names.hasMoreElements()) { String parameterName = names.nextElement(); parameterMap.addValues(parameterName, req.getParameterValues(parameterName)); } bodyFormEncoded = UrlEncoded.encode(parameterMap, Charset.forName(req.getCharacterEncoding()), true); } For some reason the request doesn't satisfy the javax.servlet HttpServletRequest<https://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html> getCharacterEncoding<https://docs.oracle.com/javaee/6/api/javax/servlet/ServletRequest.html#getCharacterEncoding()>() method. A call to CGI-exec with a POST request use to work without throwing an exception at least at jetty-distribution-9.4.14.v20181114. Experimented but can't find a fix and appreciate any insight or possible workaround to appease jetty.servlets.CGI.exec()
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