Minor edit

dmp-backend/src/main/java/dao/entities/DMPResearcherDao.java

@@ -4,7 +4,11 @@ import java.util.UUID;
 
 import dao.Dao;
 import entities.DMPResearcher;
+import entities.Researcher;
 
 public interface DMPResearcherDao extends Dao<DMPResearcher, UUID> {
 
+	
+	Researcher getResearcherByEmail(String email);
+	
 }

dmp-backend/src/main/java/dao/entities/DMPResearcherDaoImpl.java

@@ -2,9 +2,13 @@ package dao.entities;
 
 import java.util.UUID;
 
+import javax.persistence.TypedQuery;
+
+import org.hibernate.NonUniqueResultException;
 
 import dao.JpaDao;
 import entities.DMPResearcher;
+import entities.Researcher;
 
 public class DMPResearcherDaoImpl extends JpaDao<DMPResearcher, UUID> implements DMPResearcherDao {
 
@@ -13,5 +17,19 @@ public class DMPResearcherDaoImpl extends JpaDao<DMPResearcher, UUID> implements
 		return null;
 	}
 
+	@Override
+	public Researcher getResearcherByEmail(String email) {
+		String queryString = "FROM Researcher researcher where primaryEmail=:email";
+		TypedQuery<Researcher> typedQuery = entityManager.createQuery(queryString, Researcher.class);
+		typedQuery.setParameter("email", email);
+		try {
+			return typedQuery.getSingleResult();
+		}catch(Exception ex) {
+			System.out.println(ex.getMessage());
+			return null;
+		}
+		
+	}
+	
 
 }

dmp-backend/src/main/java/dao/entities/RegistryDao.java

@@ -5,6 +5,7 @@ import java.util.UUID;
 
 import dao.Dao;
 import entities.Registry;
+import entities.Researcher;
 import entities.responses.IDLabelPair;
 
 public interface RegistryDao extends Dao<Registry, UUID> {
@@ -13,4 +14,5 @@ public interface RegistryDao extends Dao<Registry, UUID> {
 
 	List<IDLabelPair> listAllIDsLabels();
 	
+
 }

dmp-backend/src/main/java/dao/entities/RegistryDaoImpl.java

@@ -10,6 +10,7 @@ import org.hibernate.query.Query;
 
 import dao.JpaDao;
 import entities.Registry;
+import entities.Researcher;
 import entities.responses.IDLabelPair;
 
 public class RegistryDaoImpl extends JpaDao<Registry, UUID> implements RegistryDao {

dmp-backend/src/main/java/dao/entities/ResearcherDao.java

@@ -13,4 +13,6 @@ public interface ResearcherDao extends Dao<Researcher, UUID> {
 
 	List<IDLabelPair> listAllIDsLabels();
 	
+	Researcher getResearcherByEmail(String email);
+
 }

dmp-backend/src/main/java/dao/entities/ResearcherDaoImpl.java

@@ -40,4 +40,14 @@ public class ResearcherDaoImpl extends JpaDao<Researcher, UUID> implements Resea
 	}
 
 
+	@Override
+	public Researcher getResearcherByEmail(String email) {
+		String queryString = "FROM Researcher researcher where researcher.primaryEmail=:email";
+		TypedQuery<Researcher> typedQuery = entityManager.createQuery(queryString, Researcher.class);
+		
+		
+		return null;
+	}
+	
+	
 }

dmp-backend/src/main/java/rest/entities/Researchers.java

@@ -96,6 +96,18 @@ public class Researchers  {
 		}
 	}
 	
+	@RequestMapping(method = RequestMethod.GET, value = { "/researcher/getByEmail" }, produces="application/json")
+	public @ResponseBody ResponseEntity<Object> getResearcherByEmail(@RequestParam("email") String email){
+		try {
+			Researcher researcher = researcherDao.getResearcherByEmail(email);
+			return ResponseEntity.status(HttpStatus.OK).body(new ObjectMapper().writeValueAsString(researcher));
+		}
+		catch(Exception ex) {
+			return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Erroneous input: "+ex.getMessage());
+		}
+		
+	}
+	
 
 	@RequestMapping(method = RequestMethod.GET, value = { "/researcher/getAll" }, produces="application/json")
 	public @ResponseBody ResponseEntity<Object> getAllResearchers(){