cometd - websocket initialization returns NoClassDefFound error

[clemsongrad]

Hi,

We are using cometd 4.0.4 because we need to support older versions of android as well. When we attempt to run the client on android 6 for example (j5) we get the following error

Caused by java.lang.ClassNotFoundException
Didn't find class "java.time.format.DateTimeFormatter" on path: DexPathList[[zip file "/data/app/xyz-1/base.apk"],nativeLibraryDirectories=[xyz]]
org.eclipse.jetty.util.DateCache. (DateCache.java:150)
org.eclipse.jetty.util.DateCache. (DateCache.java:86)
org.eclipse.jetty.util.log.StdErrLog. (StdErrLog.java:121)
org.eclipse.jetty.util.log.Log.initStandardLogging (Log.java:209)
org.eclipse.jetty.util.log.Log.initialized (Log.java:188)
org.eclipse.jetty.util.log.Log.getLogger (Log.java:311)
org.eclipse.jetty.util.log.Log.getLogger (Log.java:301)
org.eclipse.jetty.util.ajax.JSON. (JSON.java:91)
org.cometd.common.JettyJSONContext. (JettyJSONContext.java:30)
org.cometd.common.JettyJSONContextClient. (JettyJSONContextClient.java:20)
org.cometd.client.transport.ClientTransport.init (ClientTransport.java:68)
org.cometd.websocket.client.common.AbstractWebSocketTransport.init (AbstractWebSocketTransport.java:80)
org.cometd.websocket.client.okhttp.OkHttpWebsocketTransport.init (OkHttpWebsocketTransport.java:70)
org.cometd.client.BayeuxClient.prepareTransport (BayeuxClient.java:995)
org.cometd.client.BayeuxClient.access$2200 (BayeuxClient.java:101)
org.cometd.client.BayeuxClient$SessionState.handshaking (BayeuxClient.java:1410)
org.cometd.client.BayeuxClient$SessionState.access$3800 (BayeuxClient.java:1285)
org.cometd.client.BayeuxClient.lambda$handshake$1 (BayeuxClient.java:300)
org.cometd.client.BayeuxClient.lambda$handshake$1$BayeuxClient (BayeuxClient.java)
org.cometd.client.-$$Lambda$BayeuxClient$CLSKPUuTd_14JUUoJP5L2VfPYks.run (-.java)
org.cometd.client.BayeuxClient$SessionState.process (BayeuxClient.java:1606)
org.cometd.client.BayeuxClient$SessionState.submit (BayeuxClient.java:1579)
org.cometd.client.BayeuxClient$SessionState.access$500 (BayeuxClient.java:1285)
org.cometd.client.BayeuxClient.handshake (BayeuxClient.java:300)
org.cometd.bayeux.client.ClientSession.handshake (ClientSession.java:69)
org.cometd.common.AbstractClientSession.handshake (AbstractClientSession.java)
org.cometd.bayeux.client.ClientSession.handshake (ClientSession.java:60)
org.cometd.common.AbstractClientSession.handshake (AbstractClientSession.java)

Is there any work around for this?

If we upgrade to 5.X of the cometd, it requires min API version of 26 (android 8) which effectively leaves older versions out.

Any help is greatly appreciated.

Thanks!

[sbordet]

Support for Android is in CometD 3.1.x using Jetty 9.2.x, or CometD 5.0.x using the OkHttp transport.

Since CometD 4.0.x, like 5.0.x, requires Java 8 and Jetty 9.4.x, I would skip CometD 4.0.x entirely and move to CometD 5.0.x.
You'd have the java.time.format.DateTimeFormatter problem in both, so if you really need to support old Androids you need to downgrade to CometD 3.1.x.

[clemsongrad]

@sbordet

Thank you for your quick response and insight. We will give it a try. Once again appreciate your help!!!

[sbordet]

@clemsongrad is this issue solved for you?

[clemsongrad]

@sbordet

Sadly no.

[sbordet]

@clemsongrad have you tried to replace the standard Jetty logging with an SLF4J implementation that works on Android?

[clemsongrad]

@sbordet

Yes indeed that is one of the suggestions we received. I do not recall on why that did not work. In the end we moved away from the project and did not see it finish.

[sbordet]

This issue can be closed then?

[clemsongrad]

Thank you @sbordet