数据源的驱动程序类的名称缺失（Netbeans + PostgreSql + Glassfish） [英] The name of the driver class for the datasource is missing (Netbeans+ PostgreSql + Glassfish)

问题描述

我试图在Postgres 9.2 db和Glassfish 4服务器上开发一个使用Netbeans 8的EJB应用程序。

在我创建连接池和JDBC资源后glassfish管理面板，我无法添加使用数据源的实体。 Netbeans仍然给我一个错误：

数据源的驱动类的名称缺失
blockquote>

我已经尝试将库添加到项目中。我复制了
C：\程序文件\glassfish-4.0\glassfish\domains中的postgresql-9.2-1002.jdbc4.jar和postgresql-9.2-1002.jdbc3.jar文件\domain1\lib文件夹。

屏幕截图： http：/ /imageshack.com/a/img843/6884/w3ko.png

如果我使用之前创建的连接（在NB服务/数据库中）创建实体，它的工作原理，但任何查询后为空的结果集。任何想法？

这里是我创建的连接池： http://imageshack.com/a/img838/8286/bkw8.png

这是我的persistence.xml： p>

 <？xml version =1.0encoding =UTF-8？> 
< persistence version =2.1xmlns =http://xmlns.jcp.org/xml/ns/persistencexmlns：xsi =http://www.w3.org/2001/XMLSchema-实例xsi：schemaLocation =http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd\"> 
< persistence-unit name =Esempio-ejbPUtransaction-type =JTA> 
< jta-data-source> try_< / jta-data-source> 
< exclude-unlisted-classes> false< / exclude-unlisted-classes> 
<属性> 
< property name =javax.persistence.schema-generation.database.actionvalue =create/> 
< / properties> 
< / persistence-unit> 
< /余辉> 
  

解决方案

解决：这是一个连接池问题。在glassfish管理面板中创建一个驱动程序我没有更多的问题。

I'm trying to develop an EJB application using Netbeans 8 on a Postgres 9.2 db and Glassfish 4 server.

Once I created connection pool and JDBC resources in the glassfish admin panel, I'm not able to add entities using the datasource. Netbeans still giving me an error:

The name of the driver class for the datasource is missing

I've already tried adding libraries to the project. I copied postgresql-9.2-1002.jdbc4.jar and postgresql-9.2-1002.jdbc3.jar files in C:\Program Files\glassfish-4.0\glassfish\domains\domain1\lib folder.

Screenshot: http://imageshack.com/a/img843/6884/w3ko.png

If I create entities using a connection created before(in NB Services/Databases), it works, but result set after any query is empty. Any idea?

Here the connection pool I created: http://imageshack.com/a/img838/8286/bkw8.png

This is my persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="Esempio-ejbPU" transaction-type="JTA">
    <jta-data-source>try_</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

解决方案

Solved: it was a connection pool issue. Creating a driver one in glassfish admin panel I've got no more problems.

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