maven properties not being substituted inside resources

You need to add following configuration which indicates those resources need to be processed and property values will be replaced. By default Maven resources plug-in will not do property value substitution (filtering), so it will need to be enabled within the <build> section of the pom.xml file. Filtering value true will enable the resources processing and substitute property values. In addition to that one can include / exclude the resources

 <build>  
           .....  
         .....  
           <resources>  
                <resource>  
                     <directory>src/main/resources</directory>  
                     <filtering>true</filtering>  
                </resource>  
           </resources>  
           .....  
         .....  
 </build>