Hello
I'm currently experiencing a problem initializing the TypeConverters in
Camel in a Spring WebApp.
As soon as the first exchange is created and the type converters are loaded
(or type converters are loaded explicitly with
camleContext.getTypeConverterRegistry() ) then I get the following
exception:
org.apache.camel.RuntimeCamelException: java.lang.ClassCastException: Not
instanceof org.apache.camel.TypeConverter value:
org.apache.camel.converter.jaxb.FallbackTypeConverter@35f3198f:
java.lang.ClassCastException: Not instanceof org.apache.camel.TypeConverter
value: org.apache.camel.converter.jaxb.FallbackTypeConverter@35f3198f
at
org.apache.camel.impl.DefaultFactoryFinder.newInstance(DefaultFactoryFinder.java:109)
at
org.apache.camel.impl.DefaultFactoryFinder.newInstance(DefaultFactoryFinder.java:99)
at
org.apache.camel.impl.DefaultFactoryFinder.newInstances(DefaultFactoryFinder.java:65)
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.loadFallbackTypeConverters(BaseTypeConverterRegistry.java:542)
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.loadTypeConverters(BaseTypeConverterRegistry.java:535)
at
org.apache.camel.impl.converter.DefaultTypeConverter.doStart(DefaultTypeConverter.java:47)
at
org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
at
org.apache.camel.impl.DefaultCamelContext.startService(DefaultCamelContext.java:1888)
at
org.apache.camel.impl.DefaultCamelContext.doAddService(DefaultCamelContext.java:979)
at
org.apache.camel.impl.DefaultCamelContext.addService(DefaultCamelContext.java:940)
at
org.apache.camel.impl.DefaultCamelContext.getTypeConverter(DefaultCamelContext.java:1148)
at
org.apache.camel.impl.DefaultCamelContext.getTypeConverterRegistry(DefaultCamelContext.java:1165)
However, org.apache.camel.converter.jaxb.FallbackTypeConverter implements
TypeConverter so how can this be the case? I'm not doing anything with
custom type converters. I have found this on
http://camel.apache.org/type-converter.html:
---
Exposed the TypeConverterRegistry from CamelContext so end users more easily
will be able to add type converters at runtime. This is also usable in
situations where the default discovering of type converters fails on
platforms with classloading issues.
To access the registry, you get it from the CamelContext
CamelContext context = ...
context.getTypeConverterRegistry()
---
but there is no indication of exactly how this could be used if there are
class loading issues, and also simply calling getTypeConverterRegistry()
triggers the problem, so I can't see how this would be of any use.
I initially thought it may be caused by multiple versions of camel being
included in the deployment, but I've checked and only one version of camel
is used in the deployment war. Also the version of camel-core and
camel-spring are matching.
I'm currently using spring 3.2.1 and camel version 2.12.1, but I've also
tried 2.12.4 and 2.13.2 with the same result. It occurs consistently on my
local machine where I use the maven-jetty plugin (6.1.26) under cygwyn,
however when deployed to a Tomcat server (v5.5.20 running on CentOS 5.1),
the problem is only intermittent.
Any pointers to what could be the problem would be much appreciated
thanks in advance
Jason
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