Reference is null when child in another bundle

Asked Sep 23 '14 at 09:43

Active Sep 24 '14 at 09:33

Viewed 408 times

I have folowing classses

abstarct class:

@Component(componentAbstract = true)
public abstract class A implements SomeInterface{ 
    @Reference
    private ConfigurationManager manager;
    @Activate
    protected void activate(ComponentContext componentContext) {
       manager.getTimeout();
    }
}

first child:

 @Component(
            enabled = true,
            immediate = true,
            inherit = true,
            metatype = true,
            label = "***",
            description = "***"
    )
    public class A1 extends A {...}

second child:

@Component(
        enabled = true,
        immediate = true,
        inherit = true,
        metatype = true,
        label = "********",
        description = "*************"
)
public class A2 extends A {...}

A and A1 resides in same bundle but A2 in another.

when Apache Felix instantiate A1 manager.getTimeout(); row executes successfully but for A2 this row is cause of NullPointeException.

How to solve this problem?

update:

@Component(
        enabled = true,
        immediate = true,
        metatype = true,
        label = "***"
)
@Service(ConfigurationManager.class)
public class ConfigurationManager {
@Activate
    protected void activate(ComponentContext componentContext) {
        valueDelimiter = PropertiesUtil.toString(componentContext.getProperties().get(PROPERTY_VALUE_DELIMITER), PROPERTY_VALUE_DELIMITER_DEFAULT);
        valueDelimiter = Pattern.quote(StringEscapeUtils.unescapeJava(valueDelimiter));//read value from osgi config
        ...

        LOG.info("Service reconfigured: {}", toString());
    }

}

edited Sep 24 '14 at 09:33

asked Sep 23 '14 at 09:43

gstackoverflow

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It can't execute for either, `manager` is never initialized and thus it is `null`. I think maybe you're executing on threads or something and you think it is executing first. You can debug to make sure. – m0skit0 Sep 23 '14 at 09:59
I noticed it in debug. – gstackoverflow Sep 23 '14 at 10:04
Where are you initializing `manager`? – m0skit0 Sep 23 '14 at 10:04
Initially it was! = null and then then it null in same base class – gstackoverflow Sep 23 '14 at 10:05
It can't be != null if you never assign it. Show us where you initialize it or how it is initialized. – m0skit0 Sep 23 '14 at 10:08
What does the generated XML look like? Which DS annotations are these? It does not look like OSGi specification ones. Perhaps bnd or Felix? – BJ Hargrave Sep 23 '14 at 10:22
@BJHargrave `apache-felix` tag? – m0skit0 Sep 23 '14 at 10:32
@m0skit0 Can you concretize question? A annotated as Component and as Service and have annotated Activate method – gstackoverflow Sep 23 '14 at 10:53
@m0skit0 Does my update relevant to your request? – gstackoverflow Sep 24 '14 at 09:34
@gstackoverflow Sorry, I still don't see how is `manager` initialized. – m0skit0 Sep 24 '14 at 11:19
@m0skit0 I don't understand you request. Clease clarify it in details. – gstackoverflow Sep 24 '14 at 11:39
I don't know what I should clarify about "initializing a variable"... – m0skit0 Sep 24 '14 at 11:59
@m0skit0 it is reference. felix injects this service – gstackoverflow Sep 24 '14 at 13:55
Then it is not "injecting" it. – m0skit0 Sep 24 '14 at 14:03
for first child inject but second - not – gstackoverflow Sep 24 '14 at 15:14

Reference is null when child in another bundle

0 Answers0