Now I get it!This seems to work fine:
<?xml version="1.0" encoding="UTF-8"?><blueprint
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0";>
<reference id="app" interface="com.app.IApp"/> <camelContext
xmlns="http://camel.apache.org/schema/blueprint";> <route>
<from uri="timer:simple?period=5000"/> <bean ref="app"
method="doIt"/> </route> </camelContext>
</blueprint>
I didn't know I could use reference to actually reference a component
registered using @Component.
Many thanks Paul!
El viernes, 9 de junio de 2023, 19:47:42 ART, Paul McCulloch
<[email protected]> escribió:
Use reference to access your App component that Ds creates for you. You
currently have two instances of App - one from DS and one from your <bean>.
On Fri, 9 Jun 2023, 23:33 z8sbk.yahoo.com.ar via user, <[email protected]>
wrote:
Hi Paul,I'm not sure what you mean with using <reference> instead of <bean>. I
tried this:
<?xml version="1.0" encoding="UTF-8"?><blueprint
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0";>
<reference id="conf" interface="com.conf.IConf"/>
<bean id="app" class="com.app.App" >
<property name="conf" ref="conf"/>
</bean>
<camelContext xmlns="http://camel.apache.org/schema/blueprint";>
<route> <from uri="timer:simple?period=5000"/>
<to uri="bean:app?method=doIt"/> </route> </camelContext>
</blueprint>
Now the error is:
19:21:14.974 ERROR [xxxx\apache-karaf-4.2.15/deploy] Unable to start container
for blueprint bundle
confByDS.xml/0.0.0org.osgi.service.blueprint.container.ComponentDefinitionException:
Unable to find property descriptor conf on com.app.App at
org.apache.aries.blueprint.container.BeanRecipe.getPropertyDescriptor(BeanRecipe.java:831)
~[!/:1.10.3] at
org.apache.aries.blueprint.container.BeanRecipe.setProperty(BeanRecipe.java:813)
~[!/:1.10.3] at
org.apache.aries.blueprint.container.BeanRecipe.setProperties(BeanRecipe.java:784)
~[!/:1.10.3] at
org.apache.aries.blueprint.container.BeanRecipe.setProperties(BeanRecipe.java:765)
~[!/:1.10.3] at
org.apache.aries.blueprint.container.BeanRecipe.internalCreate2(BeanRecipe.java:699)
~[!/:1.10.3] at
org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:666)
~[!/:1.10.3] at
org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:81)
~[!/:1.10.3]
Could you please fix my previous blueprint? Thanks in advanced.
El viernes, 9 de junio de 2023, 17:25:31 ART, Paul McCulloch
<[email protected]> escribió:
You need to use <reference> in your blueprint to access your ds component.
Using <bean> creates a new instance, but doesn't wire it into the ds
infrastructure.
On Fri, 9 Jun 2023, 16:22 z8sbk.yahoo.com.ar via user, <[email protected]>
wrote:
Hi, I'm trying to understand how declarative service works. In a bundle, I have
these two clasess, very basic:
@Componentpublic class App implements IApp {
@Referenceprivate IConf conf;
public App() {}
public void doIt() {
System.out.println("foo=" + conf.getFoo());
}
}
@Component(name = "Conf", immediate = true, configurationPid =
"confByDS")public class Conf implements IConf {
private String foo = "bar";
public Conf() {}@Override
public String getFoo() {
return foo;
}
@Activate@Modifiedpublic void activate(ComponentContext context) {
foo = context.getProperties().get("foo") != null ? (String)
context.getProperties().get("foo") : this.foo;
}
}
Then, I have this blueprint/camel route:
<?xml version="1.0" encoding="UTF-8"?><blueprint
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0";>
<bean id="app" class="com.app.App" /> <camelContext
xmlns="http://camel.apache.org/schema/blueprint";> <route>
<from uri="timer:simple?period=5000"/> <to
uri="bean:app?method=doIt"/> </route> </camelContext>
</blueprint>
After deploying the bundle, when I put the blueprint in /deploy, throws a
NullPointerException in conf.getFoo(), which means that the Conf reference is
not injected:
Message
History---------------------------------------------------------------------------------------------------------------------------------------RouteId
ProcessorId Processor
Elapsed (ms)[route3 ] [route3
] [timer://simple?period=5000
] [ 7][route3 ] [to2 ]
[bean:app?method=doIt
] [ 0]
Stacktrace---------------------------------------------------------------------------------------------------------------------------------------java.lang.NullPointerException:
null at com.app.App.doIt(App.java:17) ~[!/:?] at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_321]
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
~[?:1.8.0_321] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[?:1.8.0_321]
I think I'm misunderstanding how the DI in Karaf works plus DS, could you
please tell me what am I missing? Does DS work with Camel XML DSL routes?
Thanks in advanced.Nick.
