M2 certificate

application/model/src/main/java/org/fuseri/model/dto/certificate/CertificateDto.java

@@ -33,6 +33,6 @@ public class CertificateDto extends DomainObjectDto {
     private CertificateFileDto certificateFile;
 
     public CertificateDto() {
-        setId("0");
+        setId(0L);
     }
 }