Feb 03, 2017 5:51:03 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [spring] in context with path [/Gif] threw exception [Request processing failed; nested exception is org.hibernate.PersistentObjectException: detached entity passed to persist: com.gif.code.model.GifModel] with root cause
org.hibernate.PersistentObjectException: detached entity passed to persist: com.gif.code.model.GifModel
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:139)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
    at com.gif.code.dao.GifDao.addData(GifDao.java:38)
    at com.gif.code.service.GifService.addData(GifService.java:32)
    at com.gif.code.service.GifService$$FastClassBySpringCGLIB$$c23a8dd4.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
    at com.gif.code.service.GifService$$EnhancerBySpringCGLIB$$4ee26afc.addData(<generated>)
    at com.gif.code.controller.GifController.addData(GifController.java:53)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

package com.gif.code.controller;

  import java.util.List;

  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.web.bind.annotation.PathVariable;
  import org.springframework.web.bind.annotation.RequestBody;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  import org.springframework.web.bind.annotation.RestController;

  import com.gif.code.model.GifModel;
  import com.gif.code.service.GifService;

  @RestController
  public class GifController {

    @Autowired
    GifService gifService;

    @RequestMapping(value = "/getAllData", method = RequestMethod.GET,  headers = "Accept=application/json")
    public List<GifModel> getData() {
        System.out.println("In Controller");
        List<GifModel> listOfData = gifService.getAllData();
        return listOfData;
    }

    @RequestMapping(value = "/getData/{id}", method = RequestMethod.GET, headers = "Accept=application/json")
    public GifModel getDataById(@PathVariable int id) {
        return gifService.getData(id);
    }

    @RequestMapping(value = "/addData", method = RequestMethod.POST, headers = "Accept=application/json")
    public void addData(@RequestBody GifModel gifModel) {
        gifService.addData(gifModel);

    }

}

package com.gif.code.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="WEBSITE")
public class GifModel {

@Id
@Column(name="id")
@GeneratedValue(strategy=GenerationType.IDENTITY)
int id;

@Column(name="title")
String title;

@Column(name="description")
String description;

public GifModel() {
    super();
}
public GifModel(int i, String title,String description) {
    super();
    this.id = i;
    this.title = title;
    this.description=description;
}
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public String getTitle() {
    return title;
}
public void setTitle(String title) {
    this.title = title;
}
public String getDescription() {
    return description;
}
public void setDescription(String description) {
    this.description = description;
}

package com.gif.code.service;


import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.gif.code.dao.GifDao;
import com.gif.code.model.GifModel;

@Service("gifService")
public class GifService {

    @Autowired
    GifDao gifDao;

    @Transactional
    public List<GifModel> getAllData() {
        System.out.println("In Service");
        return gifDao.getAllData();
    }

    @Transactional
    public GifModel getData(int id) {
        return gifDao.getData(id);
    }

    @Transactional
    public void addData(GifModel gifmodel) {
        gifDao.addData(gifmodel);
    }

}

package com.gif.code.dao;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.gif.code.model.GifModel;

@Repository
public class GifDao {

    @Autowired
    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sf) {
        this.sessionFactory = sf;
    }

    @SuppressWarnings("unchecked")
    public List<GifModel> getAllData() {
        System.out.println("In Dao");
        Session session = this.sessionFactory.getCurrentSession();
        List<GifModel> textList = session.createQuery("from GifModel").list();
        return textList;
    }

    public GifModel getData(int id) {
        Session session = this.sessionFactory.getCurrentSession();
        GifModel gifmodel = (GifModel) session.load(GifModel.class, new Integer(id));
        return gifmodel;
    }

    public GifModel addData(GifModel gifmodel) {
        Session session = this.sessionFactory.getCurrentSession();
        session.persist(gifmodel);
        return gifmodel;
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

    <annotation-driven />

    <resources mapping="/resources/**" location="/resources/" />

    <beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <beans:property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <beans:property name="url"
            value="jdbc:mysql://localhost:3306/gifdata" />
        <beans:property name="username" value="root" />
        <beans:property name="password" value="Chirpn123" />
    </beans:bean>

    <!-- Hibernate 4 SessionFactory Bean definition -->
    <beans:bean id="hibernate4AnnotatedSessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <beans:property name="dataSource" ref="dataSource" />
        <beans:property name="annotatedClasses">
            <beans:list>
                <beans:value>com.gif.code.model.GifModel</beans:value>
            </beans:list>
        </beans:property>
        <beans:property name="hibernateProperties">
            <beans:props>
                <beans:prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect
                </beans:prop>
                <beans:prop key="hibernate.show_sql">true</beans:prop>
            </beans:props>
        </beans:property>
    </beans:bean>

    <context:component-scan base-package="com.gif.code" />

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <beans:bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory" />
    </beans:bean>


</beans:beans>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.gif.code</groupId>
<artifactId>Gif</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>Gif Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <!-- <dependency>
     <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
       <version>3.1.0.RELEASE</version>
    </dependency> -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.4.1</version>
    </dependency>
    <!-- Hibernate -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate.version}</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>${hibernate.version}</version>
    </dependency>

    <!-- Apache Commons DBCP -->
    <dependency>
        <groupId>commons-dbcp</groupId>
        <artifactId>commons-dbcp</artifactId>
        <version>1.4</version>
    </dependency>
    <!-- Spring ORM -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- AspectJ -->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>${org.aspectj-version}</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.6</version>
    </dependency>
</dependencies>
<build>
    <finalName>Gif</finalName>

    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>${jdk.version}</source>
                <target>${jdk.version}</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <configuration>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
    </plugins>

</build>
<properties>
    <spring.version>4.2.1.RELEASE</spring.version>
    <security.version>4.0.3.RELEASE</security.version>
    <jdk.version>1.7</jdk.version>
    <hibernate.version>4.3.5.Final</hibernate.version>
    <org.aspectj-version>1.7.4</org.aspectj-version>
</properties>