[FELIX-5956] NPE when invoking a lifecycle runnable method from init method

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: org.apache.felix.dependencymanager-r1
• Fix Version/s: org.apache.felix.dependencymanager-r13
• Component/s: Dependency Manager Runtime
• Assignee: Pierre De Rop
• Reporter: Pierre De Rop
• Created: 08/Oct/18 16:48
• Updated: 22/Oct/18 09:02
• Resolved: 08/Oct/18 20:18

Description

When you use a DM lifecycle controller in order to trigger component activation from the @Init method, a NPE is throw if you invoke the lifecylce runnable from the init method.

For example, the following code:

@Component
public class MyServiceImpl implements MyService {

    @LifecycleController
    volatile Runnable _start;

    @Init
    void init() {
        _start.run(); // immediately trigger service activation
    }
}

produces the following NPE:

Caused by: java.lang.NullPointerException
	at org.apache.felix.dm.runtime.ToggleServiceDependency.activate(ToggleServiceDependency.java:49)
	at org.apache.felix.dm.runtime.ServiceLifecycleHandler$ComponentStarter.run(ServiceLifecycleHandler.java:431)
	at org.apache.felix.dependencymanager.samples.hello.annot.ServiceProviderImpl.init(ServiceProviderImpl.java:47)
	... 65 more