Can I use apache camel to invoke remote ejbs (ejb2.0)? How do I pass parameters to these ejsb? The example given on the camel website is not very clear. Also I'm not using spring. Can someone please help?
To call remote EJBs you can just use Java code, and let Camel call your java code.
If you want to try the camel-ejb component, then you need to configure the component for remote EJBs which is not so easy - there is a JIRA ticket to improve this in a future release.
So I suggest to just use Java code - eg just call these remote EJBs as you would do from regular Java code without using Apache Camel.
Related
I am new to Apache Camel, I have requirement to integrate two systems using REST API using Apache camel. I will receive a JSON message on my apache camel rest api endpoint(from source system).This json will contain arrays, I have to extract each array content and post to another external api end point (target). So initially I tried to send incoming message to camel rest api as it is to the target external api endpoint. When I try that, then on application startup I get error. I searched for similar exception but couldn't find anything concrete as in most of the example, source of message was used as a timer component.
Can't we make a call to external rest api end point?
Camel version : 3.4.0
Spring boot : 2.3.1
My router builder code
restConfiguration()
.component("servlet").port(9090).host("localhost")
.dataFormatProperty("prettyPrint", "true");
rest().post("/incoming")
.consumes(MediaType.APPLICATION_JSON_VALUE)
.produces(MediaType.APPLICATION_JSON_VALUE)
.route()
.to("https://webhook.site/ff4a6f68-3b20-4bb2-afa1-c15ccae515ef");
Exception I am getting for target external endpoint
org.apache.camel.NoSuchEndpointException:
No endpoint could be found for:
https://webhook.site/ff4a6f68-3b20-4bb2-afa1-c15ccae515ef,
please check your classpath contains the needed Camel component jar.
Please let me know, where I am making mistake.
Thanks in advance.
Ani
You don't have camel-http as dependency so add the dependency with correct version
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-http</artifactId>
<version>x.x.x</version>
<!-- use the same version as your Camel core version -->
</dependency>
Since you are already using camel 3.x you might also want to consider using dynamic endpoint component, in case your destination URL is defined dynamically. For example:
from("direct:login")
.toD("http:myloginserver:8080/login?userid=${header.userName}");
Actually I am playing with apache-camel 2.15.2, the REST DSL available since Camel 2.14 is not complicated. However I can't find in the official documentation how to retrieve a query parameter, basically I would like to target my REST service in this way:
http://myServer/myService/myMethod?myQueryParam=myValue
Is that possible, or is there any workaround ?
Thanks in advance.
Camel uses the REST/HTTP component of choice (restlet, jetty, servlet, netty-http, spark-rest, etc) which maps query parameters as Camel message headers.
So yes you can with the rest-dsl exposes a REST service where clients can call it with query parameters, which is then mapped to Camel message headers during routing.
I was looking up online how to create a Camel's CXF producer (i.e. create a CXF endpoint that would produce a request to some local/remote web service). Generally, all the examples I could find would list the following steps:
First define the cxfEndpoint attributes:
<cxf:cxfEndpoint
id="orderEndpoint"
address="http://localhost:9000/order/"
serviceClass="camelinaction.order.OrderEndpoint"/>
Then send the request to that endpoint:
...to("cxf:bean:orderEndpoint");
Hmmm. I don't understand the concept. If this is a remote web service, all I usually have is the URL of the WSDL. I can get from it the address of the service... but I don't know what the serviceClass is and I don't have it on my classpath.
So how do I define that cxfEndpoint in case I only have the URL of the WSDL?
Or is there another type of endpoint I should use in that case?
I would suggest looking into WSDL first for cxf. Below are two links that I think should help you out quite a lot and has helped me in the past as well.
http://code.notsoclever.cc/camel-cxf-component-wsdl-first-example/
https://access.redhat.com/documentation/en-US/Fuse_ESB_Enterprise/7.0/html-single/Web_Services_and_Routing_with_Camel_CXF/index.html#ImplWs-WsdlFirst
On the Red Hat site you will need to start at chapter 3.
Hope this helps.
In a route (that exposes a REST service) i need to get the local host address/domain (so as I can build links to be included in a response body)
Is there a way to get the local host address from within camel ?
PS : running camel inside servicemix
there isn't a Camel specific way (that I know of), I'd just use an external property file to configure environment specific settings like this...you can then use camel properties to pull this in, etc.
A good idea when posting questions is to provide more details.
Which camel component do you use for REST. And which version of SMX/Camel do you use etc.
As you question assume that the rest component in Camel will expose a hostname information.
This questions is not Camel specific per see, as you can use the regular Java API to get the hostname.
Given the "cxf-osgi" example from fuse source's apache-servicemix-4.4.1-fuse-00-08, built with maven 3.0.3, when deploying it to apache karaf 2.2.4 and CXF 2.4.3 the web service is never published and never visible to the CXF servlet (http://localhost:8181/cxf/). There are no errors in the karaf log. How would one go about debugging such behavior?
It's worth turning up the log level(s) - you can do this permanently in the etc/org.ops4j.pax.logging.cfg or in the console with log:set TRACE org.apache.cxf - IIRC this will show some useful information.
Also check that it's actually published on localhost/127.0.0.1 - it may well be being published on another interface, the IP of the local network but not localhost. Try using 0.0.0.0 as the the address, that way it will bind to all available interfaces.
As you're using maven, you can download the CXF source (easily in Eclipse) and connect a remote debugger to the Karaf instance, with some strategically placed breakpoints you should be able to get a handle on what's going on.
Try changing to Equinox instead of the default of Felix. There is a bug in 2.4.3 in that it doesn't work well with Felix. Alternatively, CXF 2.4.4 is now available that should also fix it.
Take a look at this issue I filed this week: https://issues.apache.org/jira/browse/CXF-4058
What I found is that if my beans.xml is loaded before the cxf bundle jar, then the endpoints are registered with CXF but not with the OSGi http service. So everything looks good from the logs but the endpoints are never accessible. This is a race condition.
I did two workarounds: 1) in the short term, just move my own jars later in the boot order (I use Karaf features) so Spring and CXF are fully loaded before my beans.xml is read and 2) abandon Spring and roll my own binding code based loosely on this approach: http://eclipsesource.com/blogs/2012/01/23/an-osgi-jax-rs-connector-part-1-publishing-rest-services/
I just implemented solution #2 yesterday and I'm already extremely happy with it. It's solved all of my classloader issues (before I had to manually add a lot of Import-Package lines because BND doesn't see beans.xml references) and fixed my boot race condition.