When attempting to create a Java Web service (e.g. a bottom up service, based on a java bean service implementation) in Netweaver Developer Studio (NWDS), you might receive the following cryptic error message:
"The service implementation selected is invalid."
It is as clear as mud - but the issue here is that the class name of the service implementation is lower case. To resolve the issue, just refactor the class with a right click on the offending java file and change the first letter to upper case. Quite painful if you ask me - they really need a better explanation than that in their user interface!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcP8LdiJSKr6kIZ_zEn6s8OOFPqbBRfaHzgKjaKH0HKoZ_nKLasP9-jV21vFwTQgK7KHcP86ryxes753guFBYer-K1rDFUmB1tFfBOqM93PmZI-EYG4apIEZsoOFbfaD7i40q62_DbALE/s400/UWLServiceImplementationInvalid.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgg6oL9Lmpv_ncC5V20KHGU25vkko0W7Dni54xNt9AiuJWpJil9vSlhUnRkxpSkb2SygCBkG3XkofJBQRIbvzFsNFU7GMajtJzElXdn49daUMKJ5OVRPTHHKYUAm7p89VDWEFux1PZO8uw/s400/SAPRefactor.jpg)
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