Reduce DeltaHandler logs for not found collections

[mcweba]

When making delta requests to a collection which does not exist, the following error is logged correctly:

2021-06-08 08:51:46,612 vnecri2 int  crush ERROR DeltaHandler - YL8Tgt7UPkSYyLF72OnNegAALQU Failed to handle get for collection

However, also the stacktrace of the corresponding ResourceCollectionException is logged.

Example:

org.swisspush.gateleen.core.util.ResourceCollectionException: Not Found
	at org.swisspush.gateleen.core.util.ExpansionDeltaUtil.checkResponse(ExpansionDeltaUtil.java:254)
	at org.swisspush.gateleen.core.util.ExpansionDeltaUtil.verifyCollectionResponse(ExpansionDeltaUtil.java:219)
	at org.swisspush.gateleen.delta.DeltaHandler.lambda$null$10(DeltaHandler.java:252)
	at org.swisspush.gateleen.core.http.LocalHttpServerResponse$1.lambda$bodyHandler$0(LocalHttpServerResponse.java:69)
	at org.swisspush.gateleen.core.http.BufferBridge.doEnd(BufferBridge.java:75)
	at org.swisspush.gateleen.core.http.LocalHttpServerResponse.end(LocalHttpServerResponse.java:269)
	at org.swisspush.gateleen.routing.StorageForwarder.lambda$null$1(StorageForwarder.java:141)
	at io.vertx.core.eventbus.impl.EventBusImpl.lambda$convertHandler$3(EventBusImpl.java:348)
	at io.vertx.core.eventbus.impl.HandlerRegistration.deliver(HandlerRegistration.java:261)
	at io.vertx.core.eventbus.impl.HandlerRegistration.handle(HandlerRegistration.java:239)
	at io.vertx.core.eventbus.impl.EventBusImpl$InboundDeliveryContext.next(EventBusImpl.java:565)
	at io.vertx.core.eventbus.impl.EventBusImpl.lambda$deliverToHandler$5(EventBusImpl.java:524)
	at io.vertx.core.impl.ContextImpl.executeTask(ContextImpl.java:320)
	at io.vertx.core.impl.EventLoopContext.lambda$executeAsync$0(EventLoopContext.java:38)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:462)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)

This results in lots of unnecessary log statements.

Solution
Do not log exception when the response status code is 404 Not Found. Also change the type of the log from ERROR to INFO in this case.

[mcweba]

Fixed in version v1.1.70