Hello, everybody
I am trying to implement the Offline Mode in my TouchKit application and I managed to get a custom offline
Widget
to get displayed when the device loses network connection.
However, when connection comes back an Exception is thrown:
sept. 09, 2015 12:22:37 PM org.atmosphere.cpr.DefaultBroadcaster addAtmosphereResource
WARNING: Duplicate resource 3f27dc93-bd11-4b9a-ad32-b0d21f385167. Could be caused by a dead connection not detected by your server. Replacing the old one with the fresh one
sept. 09, 2015 12:22:37 PM org.atmosphere.container.JSR356Endpoint onError
SEVERE:
java.io.IOException: An existing connection was forcibly closed by the remote host
at sun.nio.ch.SocketDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(Unknown Source)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source)
at sun.nio.ch.IOUtil.read(Unknown Source)
at sun.nio.ch.SocketChannelImpl.read(Unknown Source)
at org.apache.tomcat.util.net.NioChannel.read(NioChannel.java:140)
at org.apache.coyote.http11.upgrade.NioServletInputStream.fillReadBuffer(NioServletInputStream.java:136)
at org.apache.coyote.http11.upgrade.NioServletInputStream.doRead(NioServletInputStream.java:80)
at org.apache.coyote.http11.upgrade.AbstractServletInputStream.read(AbstractServletInputStream.java:124)
at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:51)
at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:203)
at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:198)
at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:96)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1526)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1482)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)The device comes back to the previously shown view, but interaction gets stuck.
Here is my widgetset descriptor:
<module>
<inherits name="com.vaadin.DefaultWidgetSet" />
<inherits name="com.vaadin.addon.touchkit.gwt.TouchKitWidgetSet" />
<inherits name="org.vaadin.addon.leaflet.Widgetset" />
<set-configuration-property
name='touchkit.manifestlinker.additionalCacheRoot'
value='src/main/webapp/VAADIN/themes/MyTheme:../../../VAADIN/themes/MyTheme' />
<replace-with
class="com.example.demo.frontend.widgetset.client.offlinepage.OfflinePageWidget">
<when-type-is class="com.vaadin.addon.touchkit.gwt.client.offlinemode.OfflineMode" />
</replace-with>
</module>Where
OfflinePageWidget
is the class implementing the custom widget client side, extends
VOverlay
and implements the interface
OfflineMode
. Its server side does nothing, simply sets the size in the constructor and specializes the
getState()
method. The same goes for their connector, which simply specializes the methods required by interface
AbstractComponentConnector
. The widget doesn’t implement any rpc or shared state operation.
Regarding the custom
Servlet
, the only setting is
setCacheManifestEnabled(true)
, while for the
OfflineMode
settings I have
setPersistentSessionCookie(true)
and
offlineMode.setOfflineModeTimeout(15)
.
It seems to me that I implemented all necessary operations, but I of course may be wrong, so I’m asking you if you believe I forgot something.
Thank you!