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copied!<p>Hmmm, not quite sure what the problem is, but I do find something curious. In your first block, you use the following:</p> <pre><code> def sample = currA.b?.c </code></pre> <p>According to the classes you've created, currA.b is a Collection of Bs, not a single one. Therefore currA.b?.c would be a Collection of Collections of C class instances, one Collection for each of the Bs in currA.b</p> <p>I'm not sure what would happen if currA.b was empty... given the safety operator, which equates empty with null (via GroovyTruth), I'd say sample would be null.</p> <p>None of this helps determine why the line you specify generates an error, though. Perhaps you can show us what the error is? Is it an NPE or some other?</p> <p>Looking at this more, It also looks like you're missing the "to" function call:</p> <pre><code>on("event") { intraEvent code }.**to** "eventHandlerAction" </code></pre> <p>Perhaps the error you're seeing is the result of this?</p> <p>Seems not.</p> <p>Ok, only other thing I can think of is that some time ago (v1.1 I think), they made it so you have to use "this." a lot more inside flow actions. Essentially, in order to access controller class-level objects and methods, you need to put "this." in front of the access to them. Say you wanted to put that intraEvent code you've got into a method:</p> <pre><code>def goGetC() { def anId = params.id def currA = A.get(anId) def sample = currA.b } </code></pre> <p>In order to call that method from your event code, you'd have to use:</p> <pre><code> someState { on("next") { this.goGetC() }.to ("wherever") } </code></pre> <p>If you tried to call goGetC() without the "this.", you'd instead be ending your eventhandler with the event "goGetC". I'm not sure if your simplification of your real code is hiding a similar case or not, and I'm still not sure what error exactly you're getting, but this was something that bit me a while ago and it's Flow specific. Hope this helps.</p>

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