java persistence.xml_java – 找不到persistence.xml
我尝试使用jpa与spring-orm和hibernate.
我有带有TRADES表的mysql数据库.我尝试使用jpa使用此表.
我尝试使用persistence.xml测试EntityManager创建,但是我得到一个例外,“没有为EntityManager指定持久性提供程序[persistence-unit-name from persistence.xml]”
正如我在另一个这样的问题中看到的那样,对于我的情况来说,找不到persistence.xml文件.
当我尝试测试这个配置时,我得到一个异常,我认为找不到persistence.xml.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named trade-mysql-pu
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
at com.madhusudhan.jsd.jpa.EntityManagerTest.init(EntityManagerTest.java:16)
at com.madhusudhan.jsd.jpa.EntityManagerTest.main(EntityManagerTest.java:29)
我无法弄清楚为什么会这样.你可以帮帮我吗？
谢谢.
表：
create table TRADES (ID int NOT NULL,
ACCOUNT VARCHAR(20) NOT NULL,
SECURITY VARCHAR(10) NOT NULL,
QUANTITY INT NOT NULL,
STATUS VARCHAR(10),
DIRECTION VARCHAR(10)
);
该表的实体类：
package com.madhusudhan.jsd.domain.jpa;
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="trades")
public class Trade {
private int id;
private String direction;
private String account;
private String security;
private String status;
private int quantity;
@Column(nullable=false)
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column
public String getDirection() {
return direction;
}
public void setDirection(String direction) {
this.direction = direction;
}
@Column
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
@Column
public String getSecurity() {
return security;
}
public void setSecurity(String security) {
this.security = security;
}
@Column
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
@Column
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
@Override
public String toString() {
return "Trade [id=" + id + ", direction=" + direction + ", account="
+ account + ", security=" + security + ", status=" + status
+ "]";
}
}
和src / main / resources / META-INF中的persistence.xml
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter
com.madhusudhan.jsd.domain.jpa.Trade
这是测试类：
package com.madhusudhan.jsd.jpa;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import com.madhusudhan.jsd.domain.jpa.Trade;
public class EntityManagerTest {
private EntityManagerFactory factory;
private EntityManager entityManager;
private void init() {
factory = Persistence.createEntityManagerFactory("trade-mysql-pu");
entityManager = factory.createEntityManager();
}
public void persistTrade(Trade t) {
entityManager.persist(t);
}
public static void main(String[] args) {
EntityManagerTest test = new EntityManagerTest();
test.init();
}
}
来自build.gradle的依赖项：
dependencies {
compile 'org.springframework:spring-context:4.1.6.RELEASE'
compile 'org.springframework:spring-jdbc:4.1.6.RELEASE'
compile 'org.springframework:spring-orm:4.1.6.RELEASE'
compile 'commons-dbcp:commons-dbcp:1.4'
compile 'mysql:mysql-connector-java:5.1.18'
compile 'org.hibernate:hibernate-core:3.6.0.Final'
compile 'org.hibernate:hibernate-entitymanager:3.6.0.Final'
compile 'junit:junit:4.7'
compile 'log4j:log4j:1.2.14'
}
解决方法:
你可以尝试几件事：
>检查您的src / main / resources文件夹是否在您的类路径中.在Eclipse中,它意味着右键单击项目>属性> Java Build Path并确保在Source选项卡下指定src / main / resources.如果不存在,请单击“添加文件夹”以添加资源文件夹.
>如果上述方法无效,请尝试将persistence.xml移至src / main / java / META-INF文件夹.
>将persistence.xml中的提供程序更改为
org.hibernate.ejb.HibernatePersistence
标签：java,spring,jpa,hibernate,spring-orm
来源： https://codeday.me/bug/20190623/1273594.html