Difference between top-down and bottom-up approach of developing web services
In top-down approach, first WSDL document is created and then Java classes are developed based on WSDL contract, so if WSDL contract changes you got to change your Java classes.
In bottom up approach, you first create Java code and then use annotations like @WebService to specify contract or interface and WSDL field will be automatically generated from your build.
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