Create a bean in blueprint from an external bundle - apache-camel

Question

I am using Camel in Karaf with blueprint xml and I want to create a bean with the class coming from a different bundle.
<blueprint>
...
<bean id="token-validation" class="com.xxx.security.JwtTokenValidator" init-method="init" >
<property name="realm" value="${auth.realm}"/>
</bean>
...
<camelContext>
<route id="route.EventsNotify" routePolicyRef="token-validation">
...
</camelContext>
</blueprint>
JwtTokenValidator class is located in another bundle, that extends the Camel's RoutePolicySupport, that's why it is applied in route route.EventsNotify.
public class JwtTokenValidator extends RoutePolicySupport {
#Override
public void onExchangeBegin(Route route, Exchange exchange) {
super.onExchangeBegin(route, exchange);
checkAuthorizationHeader(exchange);
}
...
}
This bundle has some dependencies and classes like the aforementioned one, in order to be used in many projects. Write once and applied in many projects instead of coping the same code again and again.
Unfortunately this is not working, I am getting the following error in stacktrace
Caused by: java.lang.ClassCastException: Cannot cast com.xxx.security.JwtTokenValidator to org.apache.camel.spi.RoutePolicy
I cannot understand why, because the class is extending RoutePolicySupport which in terms implements the desired RoutePolicy interface.
If I move the class to the same bundle it is working, but I need to have it in a seperate bundle for the reasons that I explained before.
Could someone tells me where I am wrong?
Thanks a lot!

Answer 1

Try to import all required Classes (org.apache.camel.spi.RoutePolicy, ...) to current Bundle's classLoader. If you are building your bundle with maven-bundle plugin, you can do it like this:
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
...
<configuration>
<instructions>
...
<Import-Package>
...,
org.apache.camel.spi*;version=[min_version, max_version),
...
</Import-Package>
</instructions>
</configuration>
</plugin>