显然没有那么复杂.它通过修改以下文件对我有用:

Apparently it's not that complicated. It worked for me by modifying the following files:

/nbproject/project.properties更改以下几行:

<project-folder>/nbproject/project.properties change the following lines:

j2ee.platform=1.5
javac.source=1.5
javac.target=1.5

到

j2ee.platform=1.6
javac.source=1.6
javac.target=1.6

重复同样的操作:

/-ejb/nbproject/project.properties

<project-name>/<project-name>-ejb/nbproject/project.properties

/-war/nbproject/project.properties

<project-name>/<project-name>-war/nbproject/project.properties

在 ejb-jar.xml 中更改行:

In ejb-jar.xml change the line:

   <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">

到

<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并修改这一行:

Next, find persistence.xml and change this line:

<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">

到

<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">