数据源的驱动程序类的名称缺失（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：

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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