Add control to avoid multiple application with same name.

src/main/java/org/cerberus/repositories/ApplicationRepository.java

@@ -2,8 +2,12 @@ package org.cerberus.repositories;
 
 import org.cerberus.entities.persistence.Application;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 import java.util.UUID;
 
 public interface ApplicationRepository extends JpaRepository<Application, UUID> {
+    @Query(value = "SELECT EXISTS(SELECT id FROM application WHERE name = :name)", nativeQuery = true)
+    Boolean alreadyExists(@Param("name") String name);
 }

src/main/java/org/cerberus/services/ApplicationService.java

@@ -1,9 +1,7 @@
 package org.cerberus.services;
 
-import org.cerberus.core.constant.Role;
+import org.cerberus.core.exceptions.BadRequestException;
-import org.cerberus.core.exceptions.InternalServerErrorException;
 import org.cerberus.entities.persistence.Application;
-import org.cerberus.entities.persistence.ApplicationRole;
 import org.cerberus.entities.persistence.User;
 import org.cerberus.repositories.ApplicationRepository;
 import org.cerberus.validators.ApplicationValidator;
@@ -11,6 +9,7 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import static org.cerberus.core.constant.Role.MAINTAINER;
+import static org.cerberus.core.utils.StringUtils.concat;
 
 @Service
 public class ApplicationService {
@@ -31,6 +30,10 @@ public class ApplicationService {
     public Application create(Application application, User user) {
         applicationValidator.checkAllAttributsConstraints(application);
 
+        if(applicationRepository.alreadyExists(application.getName())) {
+            throw new BadRequestException(concat("The application ", application.getName(), " already exists."));
+        }
+
         applicationRepository.save(application);
         // Application creator is by default a maintainer
         applicationRoleService.create(application, user, MAINTAINER);

src/main/sql/1.0.0-SNAPSHOT

@@ -10,7 +10,7 @@ CREATE TABLE "user" (
 
 CREATE TABLE application (
     id uuid DEFAULT uuid_generate_v4(),
-    name VARCHAR NOT NULL,
+    name VARCHAR NOT NULL UNIQUE,
     service_name VARCHAR NOT NULL,
     CONSTRAINT application_pk PRIMARY KEY (id)
 );