@Service classes are being created twice when the application starts.

https://stackoverflow.com/questions/4333390/service-are-constructed-twice

You're doing two separate component-scans over the same base-package. Remove one of them.
Make the following changes

myapp-config.xml

<!-- Load everything except @Controllers -->
<context:component-scan base-package="com.myapp">
    <context:exclude-filter expression="org.springframework.stereotype.Controller"
        type="annotation"/>
</context:component-scan>

myapp-servlet.xml

<!-- Load @Controllers only -->
<context:component-scan base-package="com.myapp" use-default-filters="false">
    <context:include-filter expression="org.springframework.stereotype.Controller" 
        type="annotation"/>
</context:component-scan>