在JBoss / WildFly中注入EntityManager

问题描述

我正在学习JPA，EJB和JBoss / WildFly。

我需要将 EntityManager 注入到我的应用。我试图按照以下方式执行：

  @Stateless 
 @LocalBean 
 public class ProductsService实现IProductsService {
 
 @PersistenceContext（unitName =myUnit）
 EntityManager entityManager; 
 
 // .... 
} 
  

而我在 .war META-INF 目录中有 persistence.xml c $ c> archive：

 <？xml version =1.0encoding =UTF-8？> 
< persistence xmlns =http://java.sun.com/xml/ns/persistenceversion =1.0> 
< persistence-unit name =myUnit> 
< jta-data-source> java：jboss / datasources / ExampleDS< / jta-data-source> 
<属性> 
< property name =hibernate.hbm2ddl.autovalue =create/> 
< property name =hibernate.show_sqlvalue =true/> 
< / properties> 
< / persistence-unit> 
< /余辉> 
  

JNDI数据源（ java：jboss / datasources / ExampleDS


当我将应用程序部署到WildFly时，出现以下错误：

>

  JBAS011440：在部署my-web-app.war中找不到名为myUnit的持久性单元。 
  

我做错了什么？

解决方案

persistence.xml 总是驻留在 {持久化根单元} / META-INF /目录中。在war文件中，您必须在 WEB-INF / classes / META-INF 中放置 persistence.xml 。

例如：

  WEB-INF / classes / META-INF /persistence.xml 
 WEB-INF / web.xml 
  

更多信息：

I am learning JPA, EJB and JBoss/WildFly.

I need to inject an EntityManager into my application. I am trying to do it in the following way:

@Stateless
@LocalBean
public class ProductsService implements IProductsService {

    @PersistenceContext(unitName = "myUnit")
    EntityManager entityManager;

//....
}

And I have persistence.xml file in the META-INF directory in my .war archive:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
    <persistence-unit name="myUnit">
        <jta-data-source>java:jboss/datasources/ExampleDS</jta-data-source>
        <properties>
            <property name="hibernate.hbm2ddl.auto" value="create" />
            <property name="hibernate.show_sql" value="true"/>
        </properties>
    </persistence-unit>
</persistence>

The JNDI data source (java:jboss/datasources/ExampleDS) is the default data source that is provided in a clean WildFly installation.

When I deploy my application to WildFly I get the following error:

JBAS011440: Can't find a persistence unit named myUnit in deployment "my-web-app.war".

What am I doing wrong?

解决方案

persistence.xml always resides in {root-of-persistence-unit}/META-INF/ directory. In a war file you must place the persistence.xml in WEB-INF/classes/META-INF.

Eg:

WEB-INF/classes/META-INF/persistence.xml
WEB-INF/web.xml

See more: Persistence Units

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