Conditional Flow for steps does not work

[vatsla20]

Condition flow mention in the spring document not working as expected.

Environment
spring-boot-starter-parent - 3.0.1
spring.batch.version - 5.0.0

As mentioned here I have used a similar approach to my job (https://docs.spring.io/spring-batch/docs/current/reference/html/step.html#conditionalFlow)

public Job exportJob() {
    return new JobBuilder(jobname, jobRepository)
        .incrementer(new RunIdIncrementer())
        .listener(jobListener)
        .start(step1("params"))
            .next(step2())
            .on("COMPLETED").to(step3())
            .from(step2()).on("COMPLETED").to(step4())
        .end()
        .build();
  }

I want the step4 to be executed on the failure of step2 and step3 on success.
Currently whichever condition in mention in the 'on' statement that works fine but condition mention in 'from' statement is ignored and I get this error.

org.springframework.batch.core.JobExecutionException: Flow execution ended unexpectedly
	at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:143) ~[spring-batch-core-5.0.0.jar:5.0.0]
	at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:316) ~[spring-batch-core-5.0.0.jar:5.0.0]
	at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:157) ~[spring-batch-core-5.0.0.jar:5.0.0]
	at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) ~[spring-core-6.0.3.jar:6.0.3]
	at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:148) ~[spring-batch-core-5.0.0.jar:5.0.0]
	at org.springframework.batch.core.launch.support.TaskExecutorJobLauncher.run(TaskExecutorJobLauncher.java:70) ~[spring-batch-core-5.0.0.jar:5.0.0]
Caused by: org.springframework.batch.core.job.flow.FlowExecutionException: Ended flow=ExportPipeline at state=ExportPipeline.step2 with exception
	at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:177) ~[spring-batch-core-5.0.0.jar:5.0.0]
	at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:142) ~[spring-batch-core-5.0.0.jar:5.0.0]
	at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:137) ~[spring-batch-core-5.0.0.jar:5.0.0]

Is this an issue with spring batch?
Could I please get a solution for such a conditional scenario for the steps execution?
Thanks in advance.

[fmbenhassine]

Thank you for opening this issue. However, we are not sure to reproduce your specific problem by piecing things together from code snippets.

If you would like us to spend some time investigating, please spend some time providing a complete yet minimal example that reproduces the problem. To help you in reporting your issue, we have prepared a project template that you can use as a starting point. Please check the Issue Reporting Guidelines for more details about this.

Thank you for your collaboration.

[AJ198081]

Hi Mahmoud, I am experiencing a similar issue.
I have tried a number of flows, and anything that uses 'from(...).on().to()', seems to end 'unexpectedly' as the next state isn't found..
A simple example is in the below figure, if the Exit Status of step 'selectFlowersShop()' is 'No_TRIM_REQUIRED', the flow works fine, but if it 'TRIM_REQUIRED' it can't find the next state.

This is the error I get -

The likely reason is that in the 'stateTransitions' you see that the from from Step0 is defined with pattern of 'No trim required', but the flow 'from' is actually defined as from 'Step2'.

But in the actual error, FlowExecution is expecting a next state from 'Step0' when the pattern is 'Trim required', which it can't find.