[jira] [Commented] (BROOKLYN-406) Coercion using fromMap(map) - exception thrown away, and value not coerced

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BROOKLYN-406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15801905#comment-15801905 ] 

ASF GitHub Bot commented on BROOKLYN-406:
-----------------------------------------

Github user aledsage commented on the issue:

    https://github.com/apache/brooklyn-server/pull/477
  
    Thanks @neykov - incorporated those changes and rebased; merging now.


> Coercion using fromMap(map) - exception thrown away, and value not coerced
> --------------------------------------------------------------------------
>
>                 Key: BROOKLYN-406
>                 URL: https://issues.apache.org/jira/browse/BROOKLYN-406
>             Project: Brooklyn
>          Issue Type: Bug
>            Reporter: Aled Sage
>             Fix For: 0.9.0
>
>
> We had a {{ConfigKey<List<VolumeOptions>>}}, and were setting that in YAML using a map. We expected {{VolumeOptions.fromMap(map)}} to be called as part of {{getConfig(VOLUMES, val)}}. This does indeed happen.
> However, if {{VolumeOptions.fromMap(map)}} throws an exception (e.g. because the input data was malformed), it does not report any problems and instead the {{getConfig}} just returns a list containing uncoerced map objects. As a result, we subsequently got a {{ClassCastException}} in our entity code.
> This was extremely hard to figure out - it involved attaching a debugger, breakpointing and stepping through the coercion code.
> ---
> Digging into the underlying cause, the problem is in this stacktrace:
> {noformat}
> "brooklyn-execmanager-PRYA08PS-104" daemon prio=5 tid=0x00007f82096c7000 nid=0x14f0b runnable [0x0000700005eac000]
>    java.lang.Thread.State: RUNNABLE
>         at org.apache.brooklyn.util.javalang.coerce.TypeCoercerExtensible.tryCoerceWithFromMethod(TypeCoercerExtensible.java:204)
>         at org.apache.brooklyn.util.javalang.coerce.TypeCoercerExtensible.tryCoerceInternal(TypeCoercerExtensible.java:135)
>         at org.apache.brooklyn.util.javalang.coerce.TypeCoercerExtensible.tryCoerce(TypeCoercerExtensible.java:107)
>         at org.apache.brooklyn.util.javalang.coerce.TypeCoercerExtensible.tryCoerceCollection(TypeCoercerExtensible.java:263)
>         at org.apache.brooklyn.util.javalang.coerce.TypeCoercerExtensible.tryCoerceInternal(TypeCoercerExtensible.java:121)
>         at org.apache.brooklyn.util.javalang.coerce.TypeCoercerExtensible.tryCoerce(TypeCoercerExtensible.java:107)
>         at org.apache.brooklyn.util.javalang.coerce.TypeCoercerExtensible.coerce(TypeCoercerExtensible.java:97)
>         at org.apache.brooklyn.util.core.flags.TypeCoercions.coerce(TypeCoercions.java:80)
>         at org.apache.brooklyn.util.core.config.ConfigBag.coerceFirstNonNullKeyValue(ConfigBag.java:502)
>         at org.apache.brooklyn.util.core.config.ConfigBag.get(ConfigBag.java:496)
>         at org.apache.brooklyn.util.core.config.ConfigBag.get(ConfigBag.java:344)
> {noformat}
> The {{TypeCoercerExtensible.tryCoerceWithFromMethod}} accidentally throws away the exception! It is therefore treated as though there was no applicable coercion. However, because {{List<Map>}} can be cast to {{List}} then it returns it anyway.



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