App Engine,JDO和Maven。启动时出错

时间:2013-02-02 08:16:06

标签: google-app-engine maven jdo datanucleus

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classpath(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

2 个答案:

答案 0 :(得分:7)

我现在一切都在工作。我以为我会分享一些问题(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

这是我最终的结果:

  <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。

答案 1 :(得分:0)

我在pom.xml中添加了 false ,它适用于我

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