显然，它并不那么复杂。它通过修改以下文件为我工作：
<project-folder>
/nbproject/project.properties 更改以下行：
j2ee.platform=1.5javac.source=1.5javac.target=1.5
至
j2ee.platform=1.6javac.source=1.6javac.target=1.6
对以下内容重复相同的操作：
<project-name>
/ <project-name>
-ejb / nbproject / project.properties
<project-name>
/ <project-name>
-war / nbproject / project.properties
在ejb-jar.xml中，更改以下行：
<ejb-jar xmlns = "http://java.sun.com/xml/ns/javaee" version = "3.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd">
至
<ejb-jar xmlns = "http://java.sun.com/xml/ns/javaee" version = "3.1" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd">
接下来，找到
persistence.xml并更改此行：
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" 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_1_0.xsd">
至
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" 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">
