[jira] [Commented] (ARIES-1858) Make typed property placeholders compatible with older Camel versions

[Grzegorz Grzybek (JIRA)]

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https://issues.apache.org/jira/browse/ARIES-1858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16679420#comment-16679420
 ] 

Grzegorz Grzybek commented on ARIES-1858:
-----------------------------------------

Here's a list of special things that 
{{org.apache.camel.blueprint.BlueprintPropertiesParser}} does:
* checking hierarchy:
{code:java}
Class<?> clazz = ((ExtendedBeanMetadata) meta).getRuntimeClass();
if (clazz != null && AbstractPropertyPlaceholder.class.isAssignableFrom(clazz)) 
{
    ids.add(id);
}
{code}
* casting:
{code:java}
Object component = container.getComponentInstance(id);
if (component instanceof AbstractPropertyPlaceholder) {
    AbstractPropertyPlaceholder placeholder = (AbstractPropertyPlaceholder) 
component;
{code}
* reflectively getting a method reference:
{code:java}
method = AbstractPropertyPlaceholder.class.getDeclaredMethod("retrieveValue", 
String.class);
method.setAccessible(true);
{code}
* non-reflectively calling {{getDefaultProperties()}} method:
{code:java}
if (placeholder instanceof PropertyPlaceholder) {
    Map map = ((PropertyPlaceholder) placeholder).getDefaultProperties();
    isDefault = map != null && map.containsKey(key);
}
{code}

> Make typed property placeholders compatible with older Camel versions
> ---------------------------------------------------------------------
>
>                 Key: ARIES-1858
>                 URL: https://issues.apache.org/jira/browse/ARIES-1858
>             Project: Aries
>          Issue Type: Improvement
>          Components: Blueprint
>    Affects Versions: blueprint-core-1.10.0
>            Reporter: Grzegorz Grzybek
>            Assignee: Grzegorz Grzybek
>            Priority: Major
>             Fix For: blueprint-core-1.10.1
>
>
> ARIES-1298 changed the runtime class of bean registered from 
> {{&#123;http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.x.0&#125;property-placeholder}}
>  and 
> {{&#123;http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.x.0&#125;property-placeholder}}.
>  This is definitely not catched by semver plugin.
> {{camel-blueprint}} (see CAMEL-12570) added support for this new runtime 
> class - it was needed because Camel explicitly casts and uses reflection on 
> old {{org.apache.aries.blueprint.ext.AbstractPropertyPlaceholder}} class, 
> while blueprint-core 1.10.0 registers placeholder class that extends 
> {{org.apache.aries.blueprint.ext.AbstractPropertyPlaceholderExt}} - and these 
> two are not related.
> The problem is that when user will try to upgrade to e.g., Karaf with 
> blueprint-core 1.10.0 *without upgrading Camel*, Camel blueprint will stop 
> detecting blueprint property resolvers.



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