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• if the body of the message can be converted to a BeanInvocation (the default payload used by the ProxyHelper) - then that its used to invoke the method and pass the arguments
• if the message contains the header org.apache.camel.MethodName then that method is invoked, converting the body to whatever the argument is to the method
• otherwise the type of the method body is used to try find a method which matches; an error is thrown if a single method cannot be chosen unambiguously.

You can also use the @Property and @Header annotations on method parameters to tell Camel which parameters map to some header/property value and which parameters map to the message body. You can use @Body to be precise about which parameter is the body.

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