@ConfigurationProperties(prefix = "mypro", merge = true, locations = { "classpath:my.properties" })

mypro.a:1
mypro.b:2
abc.d:123

 private int a;
 private int b;

@Component
public class MyPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer{
 public MyPropertyPlaceholderConfigurer(){
 this.setIgnoreResourceNotFound(true);
   final List<Resource> resourceLst = new ArrayList<Resource>();
   resourceLst.add(new ClassPathResource("my.properties"));
   this.setLocations(resourceLst.toArray(new Resource[]{}));
 }
}
@Value("abc.d")
 private String test;

@Configuration
public class Testproperties { 
 @Bean
 public PropertyPlaceholderConfigurer properties(){
 
 
 final PropertyPlaceholderConfigurer ppc = new PropertyPlaceholderConfigurer();
   ppc.setIgnoreResourceNotFound(true);
   final List<Resource> resourceLst = new ArrayList<Resource>();
   resourceLst.add(new ClassPathResource("my.properties"));
   ppc.setLocations(resourceLst.toArray(new Resource[]{}));
   return ppc;
 }
}