[jira] [Closed] (FELIX-2834) @Validate method is called when the @Requires components are not validated yet

["Clement Escoffier (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FELIX-2834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Clement Escoffier closed FELIX-2834.
------------------------------------

    
> @Validate method is called when the @Requires components are not validated yet
> ------------------------------------------------------------------------------
>
>                 Key: FELIX-2834
>                 URL: https://issues.apache.org/jira/browse/FELIX-2834
>             Project: Felix
>          Issue Type: Bug
>          Components: iPOJO
>    Affects Versions: iPOJO-1.6.0
>            Reporter: Vincent Vandemeulebrouck
>            Assignee: Clement Escoffier
>              Labels: callback, metadata, require, validation
>
> Declare two components one that requires the other.
> Have an @Validate method.
> Depending on the declaration order in the metadata.xml, the component that requires the other may have acces to a component which has not been validated.
> Example:
> @Component
> class Component1
> {
>   @Requires
>   Component2 c2;
>   @Validate
>   public void init() {
>     // this may cause an NullPointerException, as c2.usefullData is created in the @Validate method
>     if (c2.usefullData.length()>0) {
>         // Do something
>     }
>   }
> }
> @Component
> class Component2
> {
>   String usefullData;
>   @Validate
>   public void init() { usefullData="ready"; }
> }
> If you declare this metadata.xml, the @Validate will fail:
> <ipojo>
>    <instance component="Component1" />
>    <instance component="Component2" />
> </ipojo>
> Changing the order of components in xml solves the problem, although I think the validation should be called only when the required components are validated.

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