Cannot use unspecified exception in load-balance failover strategy

[apupier]

Describe the Bug

when leaving the field blank (which is even the default), the yaml contains exception : '' which is nto working, it is causing this error at runtime:

org.apache.camel.FailedToCreateRouteException: Failed to create route route1 at: >>> LoadBalanceType[FailoverLoadBalancer, [Choice[[When[simple{true} -> [Log[through choic]]]]], Log[at the bottom]]] <<< in route: Route(route1)[From[timer:demo] -> [SetProperty[aProp, simple... because of Cannot find class:  in the classpath
        at org.apache.camel.reifier.RouteReifier.doCreateRoute(RouteReifier.java:215)
        at org.apache.camel.reifier.RouteReifier.createRoute(RouteReifier.java:75)
        at org.apache.camel.impl.DefaultModelReifierFactory.createRoute(DefaultModelReifierFactory.java:49)
        at org.apache.camel.impl.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:937)
        at org.apache.camel.impl.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:800)
        at org.apache.camel.impl.engine.AbstractCamelContext.doInit(AbstractCamelContext.java:3008)
        at org.apache.camel.support.service.BaseService.init(BaseService.java:83)
        at org.apache.camel.impl.engine.AbstractCamelContext.init(AbstractCamelContext.java:2679)
        at org.apache.camel.support.service.BaseService.start(BaseService.java:111)
        at org.apache.camel.impl.engine.AbstractCamelContext.start(AbstractCamelContext.java:2698)
        at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:262)
        at org.apache.camel.main.KameletMain.doStart(KameletMain.java:274)
        at org.apache.camel.support.service.BaseService.start(BaseService.java:119)
        at org.apache.camel.dsl.jbang.core.commands.Run.run(Run.java:560)
        at org.apache.camel.dsl.jbang.core.commands.Run.call(Run.java:208)
        at org.apache.camel.dsl.jbang.core.commands.Run.call(Run.java:75)
        at picocli.CommandLine.executeUserObject(CommandLine.java:2041)
        at picocli.CommandLine.access$1500(CommandLine.java:148)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2461)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2453)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2415)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2273)
        at picocli.CommandLine$RunLast.execute(CommandLine.java:2417)
        at picocli.CommandLine.execute(CommandLine.java:2170)
        at org.apache.camel.dsl.jbang.core.commands.CamelJBangMain.run(CamelJBangMain.java:129)
        at main.CamelJBang.main(CamelJBang.java:36)
Caused by: java.lang.IllegalArgumentException: Cannot find class:  in the classpath
        at org.apache.camel.reifier.loadbalancer.FailoverLoadBalancerReifier.createLoadBalancer(FailoverLoadBalancerReifier.java:46)
        at org.apache.camel.reifier.LoadBalanceReifier.createProcessor(LoadBalanceReifier.java:36)
        at org.apache.camel.reifier.ProcessorReifier.makeProcessor(ProcessorReifier.java:857)
        at org.apache.camel.reifier.ProcessorReifier.addRoutes(ProcessorReifier.java:598)
        at org.apache.camel.reifier.RouteReifier.doCreateRoute(RouteReifier.java:211)

as mentioned in the description of the Exception field: if no exceptions are configured then all exceptions are monitored. But it is not possible to do it from UI.

The workaround is to modify the source code, reload and do not modify the load balance configuration again.

Step Extension involved in the bug

load-balance

Your Example Website or App

No response

Steps to Reproduce the Bug or Issue

1. add a step
2. add a load-balance
3. choose Fail-over strategy
4. Click apply
5. --> it generates:

- from:
    uri: timer:demo
    steps:
    - load-balance:
        failover:
          id: ''
          exception: ''
          sticky: true
          maximumFailover-Attempts: '-1'
        steps: []

Although there should be no value at all for exception, not an empty string.

Screenshots or Videos

No response

Platform

OperateFirst

[Delawen]

Fix the step extension to avoid adding empty values as empty strings.