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From Zaid Jamal Saeed Al Mahmoud <zaid.almahm...@kustar.ac.ae>
Subject RE: Using iPOJO API shows “ Cannot create a POJO instance, the POJO constructor cannot be found”
Date Sun, 02 Mar 2014 19:06:47 GMT
I will send my bundle and my java project to your email address (privately) since I don't know
Jira Ticket.


Zaid

-----Original Message-----
From: Clement Escoffier [mailto:clement.escoffier@gmail.com] 
Sent: 02 آذار, 2014 11:05 م
To: Apache Felix - Users Mailing List
Subject: Re: Using iPOJO API shows “ Cannot create a POJO instance, the POJO constructor
cannot be found”


On 2 mars 2014, at 19:56, Zaid Jamal Saeed Al Mahmoud <zaid.almahmoud@kustar.ac.ae>
wrote:

> Thank you Mr. Clement for your response.
> 
> Before trying to use manipulation, which I already done in the past. I 
> wanted to show you this interesting scenario,
> 
> This worked for me:
> 
> 	        new PrimitiveComponentType()
> 	        .setBundleContext(context)
> 	        .setClassName(PlainHelloImpl.class.getName())
> 	        .addService(new Service()) 
> 	        .createInstance(); // Create the instance
> 
> But this did not work for me:
> 
> 	        new PrimitiveComponentType()
> 	        .setBundleContext(context)
> 	        .setClassName(PlainHelloImpl.class.getName())
> 	        .createInstance(); // Create the instance
> 
> 
> As you can see, the only difference is adding the service. What? Why?

Thant’s interesting. 
So you mean adding the service makes it work ? 
Could you send me both traces.

Would you be able to share your code (either privately, or attached to a Jira ticket) so I
can reproduce it ? 

Clement

> 
> 
> Zaid
> 
> -----Original Message-----
> From: Clement Escoffier [mailto:clement.escoffier@gmail.com]
> Sent: 02 آذار, 2014 10:48 م
> To: Apache Felix - Users Mailing List
> Subject: Re: Using iPOJO API shows “ Cannot create a POJO instance, the POJO constructor
cannot be found”
> 
> Hi,
> 
> When using the iPOJO API, it tries to manipulate the component implement classes at runtime
(if there are not already manipulated). It looks like this manipulation does not happen in
your case. To be sure it is the issue, try to manipulate the class first (add @Component on
it, and use ant of maven to build your bundle). 
> 
> Clement
> 
> On 2 mars 2014, at 19:13, Zaid Jamal Saeed Al Mahmoud <zaid.almahmoud@kustar.ac.ae>
wrote:
> 
>> Hey, I am trying to use iPOJO API to create component type. (I don’t want to use
iPOJO Annotations).
>> 
>> In my bundle start method, I have the following code:
>> 
>> public void start(BundleContext context) {
>> 
>>    ComponentType x = new PrimitiveComponentType()
>>            .setBundleContext(context)
>>            .setClassName(InstanceFactoryImpl.class.getName())
>>            .setValidateMethod("start")
>>            .setInvalidateMethod("stop");
>> 
>> 
>>            x.start();
>> 
>>            try {
>>                x.createInstance();
>>            } catch (UnacceptableConfiguration e) {
>>                // TODO Auto-generated catch block
>>                e.printStackTrace();
>>            } catch (MissingHandlerException e) {
>>                // TODO Auto-generated catch block
>>                e.printStackTrace();
>>            } catch (ConfigurationException e) {
>>                // TODO Auto-generated catch block
>>                e.printStackTrace();
>>            }
>> 
>>            System.out.println("and we are done!"); } 
>> InstanceFactoryImpl class is in the same package as the following:
>> public class InstanceFactoryImpl implements 
>> instancefactory.InstanceFactory{
>> 
>> 
>>    @Override
>>    public void start() {
>> 
>> 
>> 
>>    }
>> 
>>    @Override
>>    public void stop() {
>> 
>>    }
>> 
>> 
>> 
>> }
>> When I load my bundle to Felix framework in my java application, I get the following
error:
>> 
>> [ERROR]  : [instancefactoryImpl.InstanceFactoryImpl-0] createInstance
>> -> Cannot invoke the constructor (method not found) : 
>> instancefactoryImpl.InstanceFactoryImpl.<init>(org.apache.felix.ipojo.
>> InstanceManager)
>> java.lang.NoSuchMethodException: instancefactoryImpl.InstanceFactoryImpl.<init>(org.apache.felix.ipojo.InstanceManager)
>>    at java.lang.Class.getConstructor0(Class.java:2715)
>>    at java.lang.Class.getDeclaredConstructor(Class.java:1987)
>>    at org.apache.felix.ipojo.InstanceManager.createObject(InstanceManager.java:726)
>>    at org.apache.felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java:923)
>>    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.__M_stateChanged(LifecycleCallbackHandler.java:156)
>>    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.stateChanged(LifecycleCallbackHandler.java)
>>    at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:536)
>>    at org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:418)
>>    at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:179)
>>    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:319)
>>    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:240)
>>    at org.apache.felix.ipojo.api.ComponentType.createInstance(ComponentType.java:79)
>>    at instancefactoryImpl.Activator.start(Activator.java:37)
>>    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
>>    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2146)
>>    at org.apache.felix.framework.Felix.startBundle(Felix.java:2064)
>>    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:955)
>>    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:942)
>>    at embedder.HostApplication.<init>(HostApplication.java:148)
>>    at embedder.Embedder.main(Embedder.java:12)
>> [ERROR] instancefactoryImpl.InstanceFactoryImpl : Cannot create a 
>> POJO instance, the POJO constructor cannot be found
>> org.apache.felix.ipojo.ConfigurationException: The configuration is not correct for
the type instancefactoryImpl.InstanceFactoryImpl : Cannot create a POJO instance, the POJO
constructor cannot be found
>>    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:328)
>>    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:240)
>>    at org.apache.felix.ipojo.api.ComponentType.createInstance(ComponentType.java:79)
>>    at instancefactoryImpl.Activator.start(Activator.java:37)
>>    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
>>    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2146)
>>    at org.apache.felix.framework.Felix.startBundle(Felix.java:2064)
>>    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:955)
>>    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:942)
>>    at embedder.HostApplication.<init>(HostApplication.java:148)
>>    at embedder.Embedder.main(Embedder.java:12)
>> Caused by: org.apache.felix.ipojo.ConfigurationException: Cannot create a POJO instance,
the POJO constructor cannot be found
>>    at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:191)
>>    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:319)
>>    ... 10 more
>> Caused by: java.lang.RuntimeException: Cannot create a POJO instance, the POJO constructor
cannot be found
>>    at org.apache.felix.ipojo.InstanceManager.createObject(InstanceManager.java:766)
>>    at org.apache.felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java:923)
>>    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.__M_stateChanged(LifecycleCallbackHandler.java:156)
>>    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.stateChanged(LifecycleCallbackHandler.java)
>>    at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:536)
>>    at org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:418)
>>    at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:179)
>>    ... 11 more
>> Caused by: java.lang.NoSuchMethodException: instancefactoryImpl.InstanceFactoryImpl.<init>(org.apache.felix.ipojo.InstanceManager)
>>    at java.lang.Class.getConstructor0(Class.java:2715)
>>    at java.lang.Class.getDeclaredConstructor(Class.java:1987)
>>    at org.apache.felix.ipojo.InstanceManager.createObject(InstanceManager.java:726)
>>    ... 17 more
>> I am getting the error at the following line:
>> 
>> x.createInstance();
>> I tried to explicitly define a constructor, and to add a method called "init". All
this failed, and the same error keeps showing. What should I do? Thanks?
>> 
>> 
>> 
>> Kind Regards,
>> Zaid Almahmoud
>> Research Assistant
>> 
>> Khalifa University of Science, Technology, and Research Abu Dhabi - 
>> United Arab Emirates
>> TEL: 00971-2-401-8178
>> MOB: 00971-50-9619601
> 
> 
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