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Posted to dev@brooklyn.apache.org by "Aled Sage (JIRA)" <ji...@apache.org> on 2017/01/10 12:52:58 UTC
[jira] [Resolved] (BROOKLYN-406) Coercion using fromMap(map) -
exception thrown away, and value not coerced
[ https://issues.apache.org/jira/browse/BROOKLYN-406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aled Sage resolved BROOKLYN-406.
--------------------------------
Resolution: Fixed
Fix Version/s: (was: 0.9.0)
0.11.0
> 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: 0.11.0
>
>
> 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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