persistence work (unstable)

spring-hibernate4/src/main/java/org/baeldung/spring/persistence/dao/common/AbstractHibernateDao.java

@@ -33,9 +33,9 @@ public abstract class AbstractHibernateDao<T extends Serializable> implements IO
     }
 
     @Override
-    public final long create(final T entity) {
+    public final void create(final T entity) {
         Preconditions.checkNotNull(entity);
-        return (Long) getCurrentSession().save(entity);
+        getCurrentSession().save(entity);
     }
 
     @Override

spring-hibernate4/src/main/java/org/baeldung/spring/persistence/dao/common/IOperations.java

@@ -9,7 +9,7 @@ public interface IOperations<T extends Serializable> {
 
     List<T> findAll();
 
-    long create(final T entity);
+    void create(final T entity);
 
     T update(final T entity);
 

spring-hibernate4/src/main/java/org/baeldung/spring/persistence/service/common/AbstractService.java

@@ -0,0 +1,42 @@
+package org.baeldung.spring.persistence.service.common;
+
+import java.io.Serializable;
+import java.util.List;
+
+import org.baeldung.spring.persistence.dao.common.IOperations;
+
+public abstract class AbstractService<T extends Serializable> implements IOperations<T> {
+
+    @Override
+    public T findOne(final long id) {
+        return getDao().findOne(id);
+    }
+
+    @Override
+    public List<T> findAll() {
+        return getDao().findAll();
+    }
+
+    @Override
+    public void create(final T entity) {
+        getDao().create(entity);
+    }
+
+    @Override
+    public T update(final T entity) {
+        return getDao().update(entity);
+    }
+
+    @Override
+    public void delete(final T entity) {
+        getDao().delete(entity);
+    }
+
+    @Override
+    public void deleteById(final long entityId) {
+        getDao().deleteById(entityId);
+    }
+
+    protected abstract IOperations<T> getDao();
+
+}

spring-hibernate4/src/main/java/org/baeldung/spring/persistence/service/impl/FooService.java

@@ -1,14 +1,16 @@
-package org.baeldung.spring.persistence.service;
+package org.baeldung.spring.persistence.service.impl;
 
 import org.baeldung.spring.persistence.dao.IFooDao;
+import org.baeldung.spring.persistence.dao.common.IOperations;
 import org.baeldung.spring.persistence.model.Foo;
+import org.baeldung.spring.persistence.service.common.AbstractService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
 @Transactional
-public class FooService {
+public class FooService extends AbstractService<Foo> {
 
     @Autowired
     private IFooDao dao;
@@ -19,8 +21,9 @@ public class FooService {
 
     // API
 
-    public void create(final Foo entity) {
-        dao.create(entity);
+    @Override
+    protected IOperations<Foo> getDao() {
+        return dao;
     }
 
 }

spring-hibernate4/src/test/java/org/baeldung/spring/persistence/service/FooServicePersistenceIntegrationTest.java

@@ -4,6 +4,7 @@ import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
 
 import org.baeldung.spring.persistence.config.PersistenceConfig;
 import org.baeldung.spring.persistence.model.Foo;
+import org.baeldung.spring.persistence.service.impl.FooService;
 import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;