Clash Royale CLAN TAG#URR8PPP

Hystrix command on request collapser fallback

I have a scenario where I want to apply hystrix on the fallback (and process one-by-one) of a hystrix request collapser's batch method.

The fallback method (processEntryBatch_fallback) is invoked. But the hystrix command (processEntryBackup) in turn the fallback invokes is not reported (doesn't even appear on dashboard). And the fallback method (finalFallback) is not invoked either.

I would like to know what am I missing here ?

I referred javanica documentation

processEntryBatch_fallback

processEntryBackup

finalFallback

@Service
public class DummyService

private static final Logger log = LoggerFactory.getLogger(DummyService.class);

//batch processing method
public void processEntry(List<String> msg)
//batch processing
throw new RuntimeException("Exception while batch processing");


//processing one-by-one
@HystrixCommand(fallbackMethod="finalFallback")
public void processEntryBackup(String msg)
throw new RuntimeException("Exception while single processing");


public void finalFallback(String msg)
log.info("logging..." + msg);


@HystrixCollapser(batchMethod = "processEntryBatch", collapserKey="ProcessEntryCollapser", scope=Scope.GLOBAL)
public Future<Object> processEntryCollapser(String msg)
return null;


@HystrixCommand(fallbackMethod="processEntryBatch_fallback")
public List<Object> processEntryBatch(List<String> msgList)
processEntry(msgList);
return new ArrayList<>(msgList);


public List<Object> processEntryBatch_fallback(List<String> msgList)
for (String msg : msgList)
processEntryBackup(msg);

return new ArrayList<>(msgList);




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