App Engine,JDO和Maven.启动时出错

Question

我正在尝试使用带有App Engine的JDO和Maven配置创建一个简单的测试.

我的编译和数据增强步骤成功.但是在运行时(mvn:test和appengine:devserver)我得到:

1) Error in custom provider, javax.jdo.JDOFatalInternalException: 
Class "com.google.appengine.datanucleus.DatastoreManager" was not found in the CLASSPATH.
Please check your specification and your CLASSPATH.

但是,我的类路径(target/demo/WEB-INF/lib)确实包含:datanucleus-appengine-2.1.1.jar

我的依赖关系与Google datanucleus项目的POM中指定的依赖关系相同:

  <dependency>
    <groupId>javax.jdo</groupId>
    <artifactId>jdo-api</artifactId>
    <version>3.0.1</version>
  </dependency>
  <dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-core</artifactId>
    <version>[3.1.1, 3.2)</version>
    <scope>runtime</scope>
  </dependency>
  <dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-api-jdo</artifactId>
    <version>[3.1.1, 3.2)</version>
  </dependency>
  <dependency>
    <groupId>com.google.appengine.orm</groupId>
    <artifactId>datanucleus-appengine</artifactId>
    <version>2.1.1</version>
  </dependency>

感谢任何建议.

RB

Answer 1

我现在一切都在工作.我以为我会分享一些陷阱(因为我花了几天时间来完成所有这些工作):

1).所有版本都很重要(特别是将App Engine ORM 2.1.1与DataNucleus 3.1.1相匹配 - 包括插件).

http://www.datanucleus.org/products/accessplatform_3_2/datastores/appengine.html

这是我最终得到的:

  <dependency>
    <groupId>javax.jdo</groupId>
    <artifactId>jdo-api</artifactId>
    <version>3.0.1</version>
  </dependency>
  <dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-core</artifactId>
    <version>3.1.1</version>
    <scope>runtime</scope>
  </dependency>
  <dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-api-jdo</artifactId>
    <version>3.1.2</version>
  </dependency>
  <dependency>
    <groupId>com.google.appengine.orm</groupId>
    <artifactId>datanucleus-appengine</artifactId>
    <version>2.1.2</version>
  </dependency>

  ...

  <plugin>
    <groupId>org.datanucleus</groupId>
    <artifactId>maven-datanucleus-plugin</artifactId>
    <version>3.1.2</version>
    <configuration>
      <log4jConfiguration>${basedir}/log4j.properties</log4jConfiguration>
      <verbose>false</verbose>
      <fork>false</fork>
    </configuration>
    <executions>
      <execution>
        <phase>process-classes</phase>
        <goals>
          <goal>enhance</goal>
        </goals>
      </execution>
    </executions>
  </plugin>

2).检查datanucleus.log的尾部以确认您的类已增强(通过mvn datanucleus:enhance).我终于意识到我的测试类(在src/test中)被忽略了.