#41 JAM VM gives the following exceptions:

[Rajesh Goel]

The environment is:
- the jam vm version is JamVM 1.5.3
- GNU Classpath version is 0.98
- the GNU Classpath is build by disabling the following things as they are not required by us:
. /configure --disable-gtk-peer --disable-plugin --disable-gconf-peer --enable-tools
- we are running jetty 6.1.8 using the jam vm.
- we are connecting to the jetty (which is running on jamvm), through the browser (IE7) on port 8080, but there is no response from the server.
- Our code runs fine when it is running jetty on sun jre 1.5. So it is certain that the problem is with the jamvm
- the linux platform is: debian
- After some analysis, it seems that there is some bug in the socket library of GNU Classpath due to which it stops responding after running for sometime.

java.lang.IllegalArgumentException: channel already registered
at gnu.java.nio.EpollSelectorImpl.register(EpollSelectorImpl.java:266)
at java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:251)
at java.nio.channels.SelectableChannel.register(SelectableChannel.java:114)
at org.mortbay.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:488)
at org.mortbay.io.nio.SelectorManager.doSelect(SelectorManager.java:166)
at org.mortbay.jetty.nio.SelectChannelConnector.accept(SelectChannelConnector.java:124)
at org.mortbay.jetty.AbstractConnector$Acceptor.run(AbstractConnector.java:537)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)

java.nio.channels.NotYetConnectedException
at gnu.java.nio.SocketChannelImpl.write(SocketChannelImpl.java:240)
at org.mortbay.io.nio.ChannelEndPoint.flush(ChannelEndPoint.java:166)
at org.mortbay.io.nio.SelectChannelEndPoint.flush(SelectChannelEndPoint.java:207)
at org.mortbay.jetty.HttpGenerator.flush(HttpGenerator.java:693)
at org.mortbay.jetty.AbstractGenerator$Output.flush(AbstractGenerator.java:566)
at org.mortbay.jetty.HttpConnection$Output.flush(HttpConnection.java:910)
at org.mortbay.jetty.AbstractGenerator$OutputWriter.flush(AbstractGenerator.java:731)
at java.io.PrintWriter.flush(PrintWriter.java:244)
at org.apache.jasper.runtime.JspWriterImpl.flush(JspWriterImpl.java:221)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:985)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:671)
at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:884)
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:855)
at org.apache.jsp.template_jsp._jspService(org.apache.jsp.template_jsp:135)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:285)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:261)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:237)
at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:300)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
at com.ipolicynet.dm.common.framework.DmActionServlet.doGet(DmActionServlet.java:151)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)

java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:607)
at java.awt.Font.tk(Font.java:317)
at java.awt.Font.getPeerFromToolkit(Font.java:329)
at java.awt.Font.<init>(Font.java:381)
at org.jfree.chart.plot.Plot.<init>(Plot.java:296)
at org.jfree.chart.plot.dial.DialPlot.<init>(DialPlot.java:150)
at org.jfree.chart.plot.dial.DialPlot.<init>(DialPlot.java:142)
at com.ipolicynet.dm.monitoring.dashboard.action.DmJfreeImageUtility.drawImage(DmJfreeImageUtility.java:28
at com.ipolicynet.dm.monitoring.dashboard.action.DmMonDashResUsgae.execute(DmMonDashResUsgae.java:59)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
at com.ipolicynet.dm.common.framework.DmActionServlet.doGet(DmActionServlet.java:151)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
Caused by: java.lang.UnsatisfiedLinkError: Native library `gtkpeer' not found (as file `libgtkpeer.so') in gnath
at java.lang.Runtime.loadLibrary(Runtime.java:763)
at java.lang.System.loadLibrary(System.java:670)
at gnu.java.awt.peer.gtk.GtkToolkit.<clinit>(GtkToolkit.java:177)
at java.lang.VMClass.forName(Native Method)
at java.lang.Class.forName(Class.java:233)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:583)

[Anonymous]

I was able to recreate the java.nio.channels.NotYetConnectedException by downloading NanoHTTPD, compiling it, running it and connecting to it using curl. If I hit ^C just as the request is going through I get the exception.

I first saw the problem when a user was hitting the X button in a browser.

== Compiler ==
$ curl http://elonen.iki.fi/code/nanohttpd/NanoHTTPD.java > NanoHTTPD.java
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 33067 100 33067 0 0 48059 0 --:--:-- --:--:-- --:--:-- 135k
$ javac NanoHTTPD.java
Note: NanoHTTPD.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: NanoHTTPD.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
$

== Server ==
# jamvm NanoHTTPD
NanoHTTPD 1.24 (C) 2001,2005-2011 Jarno Elonen and (C) 2010 Konstantinos Togias
(Command line options: [-p port] [-d root-dir] [--licence])

Now serving files in port 80 from "/tmp/."
Hit Enter to stop.

GET '/'
HDR: 'accept' = '*/*'
HDR: 'host' = 'localhost'
HDR: 'user-agent' = 'curl/7.21.2 (powerpc-unknown-linux-gnu) libcurl/7.21.2 OpenSSL/1.0.0d zlib/1.2.5'
Exception in thread "Thread-6" java.nio.channels.NotYetConnectedException
at gnu.java.nio.SocketChannelImpl.write(SocketChannelImpl.java:240)
at gnu.java.net.PlainSocketImpl$SocketOutputStream.write(PlainSocketImpl.java:668)
at NanoHTTPD$HTTPSession.sendResponse(NanoHTTPD.java:794)
at NanoHTTPD$HTTPSession.run(NanoHTTPD.java:447)
at java.lang.Thread.run(Thread.java:745)

== Client ==
# curl http://localhost/

#