Problem with bean method calls and parameter types

[Ryan Moquin <fr...@gmail.com>]

Hi, I'm using Camel 2.16.0 and trying to invoke a bean method using spring
xml and having some issues.  It seems like any time I try to invoke a bean
method with a camel message body, camel tries to pass it as a string to the
method (even though the method takes the class as an argument) I'm calling
even though the body type is correctly set to the java class type and the
body itself is a class.  I've called bean methods a lot from Camel and
don't remember this being normal behavior?  Or am I wrong?

Caused by: org.apache.camel.component.bean.ParameterBindingException: Error
during parameter binding on method: public java.lang.String
com.test.TestService.retrieve(com.test.bo.TestObject,java.util.Date,com.test.TestParam)
at parameter #0 with type: class com.test.bo.TestObject with value type:
class java.lang.String and value: com.test.bo.TestObject
        at
org.apache.camel.component.bean.MethodInfo$2.evaluateParameterValue(MethodInfo.java:582)
        ...
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type
converter available to convert from type: java.lang.String to the required
type: com.test.bo.TestObject with value com.test.bo.TestObject
        at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:1
85)

I'm just calling the bean method like you normally would.  I can log the
value of a property of the java class in the body using a log statement
right before I do the invocation of the method.  I don't do anything
special when calling the method other than putting the first parameter as:
${body}

Is this by design in Camel and I never noticed?  If so, is there any way
around it?

Thanks for any help!
Ryan

Re: Problem with bean method calls and parameter types

[Antonin Stefanutti <an...@stefanutti.fr>]

Hi Ryan,

The following Camel DSL:

to("bean:beanClass?method=methodToCall(${body})")

or

bean(BeanClass.class, "methodToCall(${body})")

Does not convert the body to String when the type of body corresponds to that of the first method parameter.

Is there any step upfront in your route that may convert the body to String?

The error that you have can occur when quotes are added to type declaration like:

to("bean:beanClass?method=processBody('org.apache.camel.cdi.se.bean.Pojo')")
                                                                     ^                                                        ^
instead of:

to("bean:beanClass?method=processBody(org.apache.camel.cdi.se.bean.Pojo)")

Could you share you exact piece of route and bean class?

Antonin

> On 12 Nov 2015, at 18:20, Ryan Moquin <fr...@gmail.com> wrote:
> 
> Hi, I'm using Camel 2.16.0 and trying to invoke a bean method using spring
> xml and having some issues.  It seems like any time I try to invoke a bean
> method with a camel message body, camel tries to pass it as a string to the
> method (even though the method takes the class as an argument) I'm calling
> even though the body type is correctly set to the java class type and the
> body itself is a class.  I've called bean methods a lot from Camel and
> don't remember this being normal behavior?  Or am I wrong?
> 
> Caused by: org.apache.camel.component.bean.ParameterBindingException: Error
> during parameter binding on method: public java.lang.String
> com.test.TestService.retrieve(com.test.bo.TestObject,java.util.Date,com.test.TestParam)
> at parameter #0 with type: class com.test.bo.TestObject with value type:
> class java.lang.String and value: com.test.bo.TestObject
>        at
> org.apache.camel.component.bean.MethodInfo$2.evaluateParameterValue(MethodInfo.java:582)
>        ...
> Caused by: org.apache.camel.NoTypeConversionAvailableException: No type
> converter available to convert from type: java.lang.String to the required
> type: com.test.bo.TestObject with value com.test.bo.TestObject
>        at
> org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:1
> 85)
> 
> I'm just calling the bean method like you normally would.  I can log the
> value of a property of the java class in the body using a log statement
> right before I do the invocation of the method.  I don't do anything
> special when calling the method other than putting the first parameter as:
> ${body}
> 
> Is this by design in Camel and I never noticed?  If so, is there any way
> around it?
> 
> Thanks for any help!
> Ryan