camel upgrade issue in spring project - spring

Question

I am facing issue in upgrading camel 3.7.0 to 3.15.0. I am getting below error:
nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.camel.spring.xml.handler.CamelNamespaceHandler]: Unresolvable class definition; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.apache.camel.spring.xml.handler.CamelNamespaceHandler
2875Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [producer-camel-core-context.xml];
Any help is highly appreciated.

Answer 1

BeanDefinitionStoreException
If you use ActiveMQ 5.x that ships with Camel 1.x and you upgrade it to use Camel 2.0 you can get an exception while starting.
ERROR: java.lang.RuntimeException: Failed to execute start task. Reason:
org.springframework.beans.factory.BeanDefinitionStoreException:
Unrecognized xbean namespace mapping: http://activemq.apache.org/camel/schema/spring
The reason is basically that the XML namespace changed in Camel 2.0 as explained below.
When Camel went from an activemq subproject to a top level apache project, they changed the URIs for their xml schemas to reflect this in Camel 2.0.
To fix this, in activemq.xml change all occurrences of:
http://activemq.apache.org/camel/schema/spring
to
http://camel.apache.org/schema/spring
and
http://activemq.apache.org/camel/schema/spring/camel-spring.xsd
to
http://camel.apache.org/schema/spring/camel-spring.xsd
Refer:
(http://people.apache.org/~dkulp/camel/exception-beandefinitionstoreexception.html)