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

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: iPOJO-1.6.0
• Component/s: iPOJO
• Labels: callback metadata require validation
• Assignee: Clement Escoffier
• Reporter: Vincent Vandemeulebrouck
• Created: 10/Feb/11 10:46
• Updated: 04/Feb/13 12:34
• Resolved: 17/Feb/11 06:57

Description

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.