Invocation of init method failed; nested exception is javax.persistence.PersistenceException - spring

Question

Guys i've came across a problem which i googled a lot and tried to find solutions in stackflow,however it failed and there seems no body have met with the same problem .What's more , i've got exhausted.Below is my code and configuration files.
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.robot</groupId>
<artifactId>springdata</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<dependencies>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.data/spring-
data-jpa -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.8.0.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/hibernate/hibernate-entitymanager --
>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.3.6.Final</version>
</dependency>
</dependencies>
</project>
in my dependency xml,i add spring data and hibernate.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!--1 配置数据源-->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource" >
<property name="driverClassName" value="com.mysql.jdbc.Driver">
</property>
<property name="username" value="root"></property>
<property name="password" value="root"></property>
<property name="url" value="jdbc:mysql:///spring_data"></property>
</bean>
<!--2 配置EntityManagerFactory-->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="jpaVendorAdapter">
<bean
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
</property>
<property name="packagesToScan" value="com.robot"/>
<property name="jpaProperties">
<props>
<prop
key="hibernate.ejb.naming_strategy">
org.hibernate.cfg.ImprovedNamingStrategy</prop>
<prop
key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
<!--<!–3 配置事务管理器–>-->
<!--<bean id="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager">-->
<!--<property name="entityManagerFactory" ref="entityManagerFactory"/>--
>
<!--</bean>-->
<!--<!–4 配置支持注解的事务–>-->
<!--<tx:annotation-driven transaction-manager="transactionManager"/>-->
<!--<!–5 配置spring data–>-->
<!--<jpa:repositories base-package="com.robot" entity-manager-factory-
ref="entityManagerFactory"/>-->
<!--<context:component-scan base-package="com.robot"/>-->
</beans>
below is my entity class, it is very simple,so i don't think any thing will go wrong.
package com.robot.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
#Entity
public class Employee {
private int id;
private String name;
private int age;
public int getId() {
return id;
}
#GeneratedValue
#Id
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
below is my test class
package com.robot.dao;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class StudentSpringDataTest {
private ApplicationContext ctx=null;
#Before
public void setUp(){
System.out.println("Set Up");
ctx= new ClassPathXmlApplicationContext("beans_new.xml");
}
#After
public void tearDown(){
System.out.println("Tear Down");
ctx =null;
}
#Test
public void initializationTest(){
}
}
when i run the initializationTest method it show error like the picture described.
log info

Answer 1

For your next questions do not include your stack traces as image.
The error is clear: "No identifier specified for entity: ....", and that is because you have your #Id annotation on a set method, and you can not use annotation on settters. You need to use it either on the field or on the getter method.
Hibernate mapping annotations - Access type
Try:
#Entity
public class Employee {
#GeneratedValue
#Id
private int id;
...
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
...
}