https://github.com/apache/cxf/pull/102
contains a Rube Goldberg machine that I built to use Hibernate Bean Validation inside of a CXF web service inside of pax web inside of Apache Karaf. I wonder how much of this might be replaced by something that exists, or could exist, in ServiceMix. Step 1: javax.validation has an SPI. Everything I've read pointed to using an explicit provider that knows how to get a Hibernate provider, rather than any attempt to make the SPI mechanism work in OSGi. Does anyone here have any contrary view that the SPI could be made to function via a sufficiency of Dynamic-ImportPackage? On the other hand, would it make sense to put the Helper class that uses the provider API to avoid the SPI into ServiceMix? Step 2: Using the SPI, you obtain a ValidatorFactory. Using the ValidatiorFactory, you obtain a Validator. When you _call_ the Hibernate Validator, it in turn uses the javax.el SPI to obtain an implementation of the expression language. To get around this, I wrapped a proxy around the Validator that sets the Thread context classloader to a class loader from a bundle with an import of 'com.sun.el', the package containing the implementation of EL that I have in the container. Does, or could, Servicemix provide a wrapper around the EL API that would avoid this?
