錯誤使用DataNucleus將REST API

Question

當我做一個HTTP POST將在我的本地AppEngine上的研究與開發服務器DataNucleus將REST資源，服務器將引發此錯誤：

Caused by: java.lang.ClassNotFoundException: org.datanucleus.NucleusContext 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423) 
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356) 
    ... 37 more 

從它似乎什麼，使用Datnuclues REST API平臺不允許使用appengine嗎？

編輯： DataNucleus將在POM：

<dependency> 
    <groupId>com.google.appengine.orm</groupId> 
    <artifactId>datanucleus-appengine</artifactId> 
    <version>2.0.0</version> 
</dependency> 
<dependency> 
    <groupId>org.datanucleus</groupId> 
    <artifactId>datanucleus-core</artifactId> 
    <version>3.0.0-release</version> 
</dependency> 

<dependency> 
    <groupId>org.datanucleus</groupId> 
    <artifactId>datanucleus-api-jpa</artifactId> 
    <version>3.0.0-release</version> 
</dependency> 
<dependency> 
    <groupId>org.apache.geronimo.specs</groupId> 
    <artifactId>geronimo-jpa_2.0_spec</artifactId> 
    <version>1.0</version> 
</dependency> 

     <!-- Required by Datanucleus REST API --> 
     <dependency> 
      <groupId>org.datanucleus</groupId> 
      <artifactId>datanucleus-rest</artifactId> 
      <version>2.0.0-release</version> 
     </dependency> 
     <dependency> 
      <groupId>net.sf.flexjson</groupId> 
      <artifactId>flexjson</artifactId> 
      <version>2.1</version> 
     </dependency> 
     <dependency> 
      <groupId>org.datanucleus</groupId> 
      <artifactId>datanucleus-json</artifactId> 
      <version>2.0.0-release</version> 
     </dependency> 

下面是在WEB-INF/lib文件夾的DN相關的罐：

• DataNucleus將靜止-2.0 .0-release.jar
• datanucleus-json-2.0.0-release.jar
• 個DataNucleus將核 - 3.0.0-release.jar
• DataNucleus將-的AppEngine-2.0.0.jar
• DataNucleus將-API的JP-A-3.0.0-release.jar

編輯：

通過使用v3.0 DN依賴項修復了最初的問題。

但是，現在當我嘗試從DN servlet的訪問REST資源，它拋出這個錯誤：

Error : An error occurred trying to instantiate an instance of the API adapter "org.datanucleus.api.jdo.JDOAdapter" (perhaps you dont have the requisite datanucleus-api-XXX jar in the CLASSPATH?) : {1} 
org.datanucleus.exceptions.NucleusUserException: Error : An error occurred trying to instantiate an instance of the API adapter "org.datanucleus.api.jdo.JDOAdapter" (perhaps you dont have the requisite datanucleus-api-XXX jar in the CLASSPATH?) : {1} 

Answer 1

所以你使用DataNucleus將-API的休息（大概3.X）的一些版本，並且沒有必要的datanucleus-core（也是3.x）版本。這通常是什麼ClassNotFoundException意味着