By creating a ServletContextListener that sets a static ServletContext
variable in a RegistryProxy class I created, I now have access to the
Tapestry-IoC registry from anywhere in the application. So the internal
wiring ought to be in place now.
However, when I use my custom endpoint Configurator to get an instance of
ServerEndpoint (implementation) from the registry, it seems that what I
get back is not castable:
15-Apr-2019 12:45:28.488 SEVERE [http-nio-8080-exec-915]
org.apache.coyote.AbstractProtocol$ConnectionHandler.process Error reading
request, ignored
java.lang.ClassCastException: Cannot cast
$HarbourServerEndpoint_39c9cc24eb8b2a to
com.optomus.harbour.services.HarbourServerEndpointImpl
at java.lang.Class.cast(Class.java:3369)
at
com.optomus.harbour.services.HarbourServerEndpointConfigurator.getEndpointInstance(HarbourServerEndpointConfigurator.java:17)
at
org.apache.tomcat.websocket.pojo.PojoEndpointServer.onOpen(PojoEndpointServer.java:44)
at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.init(WsHttpUpgradeHandler.java:133)
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:846)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471)
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Just wondering whether you have any idea why this might be? Accessing the
registry is via a chain of 'generic' methods, but I can't find fault here.
Given that Tapestry works similarly when actioning the @Inject
annotation, you might immediately recognise where the fault lies.
My Configurator method:
@Override
public <T> T getEndpointInstance(Class<T> endpointClass) throws
InstantiationException {
return
endpointClass.cast(RegistryProxy.getService(HarbourServerEndpoint.class));
}
My RegistryProxy method:
public static <T> T getService(Class<T> serviceInterface){
Registry registry =
(Registry)context.getAttribute(TapestryFilter.REGISTRY_CONTEXT_NAME);
return registry.getService(serviceInterface);
}
Incidentally, altering my Configurator method to use old style casting (as
per below) didn't solve the problem.
@Override
public <T> T getEndpointInstance(Class<T> endpointClass) throws
InstantiationException {
return (T)RegistryProxy.getService(HarbourServerEndpoint.class);
}
Finally, with no casting at all, the compiler gives the error:
Error:(17, 40) java: incompatible types: inference variable T has
incompatible bounds
equality constraints:
com.optomus.harbour.services.HarbourServerEndpoint
upper bounds: T,java.lang.Object
Regards,
Chris.
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