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Date: Thu, 10 Feb 2011 10:47:57 +0000 (UTC)
From: "Vincent Vandemeulebrouck (JIRA)" <jira@apache.org>
To: dev@felix.apache.org
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Subject: [jira] Created: (FELIX-2834) @Validate method is called when the
 @Requires components are not validated yet
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@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


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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