Java 未找到appengine、JDO 3.0和maven中的com.google.appengine.datanucleus.DatastoreManager类错误

尝试用代码启动appengine devserver时出现此错误：

（命令为appengine-java-sdk-1.8.1.1/bin/dev_appserver.sh target/myapp/）

信息：捕获并报告了异常。信息： org.datanucleus.exceptions.ClassNotResolvedException:类 在中找不到“com.google.appengine.datanucleus.DatastoreManager” 类路径。请检查您的规范和类路径。 javax.jdo.JDOFatalInternalException:类 在中找不到“com.google.appengine.datanucleus.DatastoreManager” 类路径。请检查您的规范和类路径

我正在使用Guice，因此我的模块如下所示：

public class MyModule extends ServletModule {

@Override
public void configureServlets() {
  bind(PersistenceManagerFactory.class)
      .toInstance(JDOHelper.getPersistenceManagerFactory("transactions-optional"));
  // ...

<properties>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <com.google.inject.version>3.0</com.google.inject.version>
    <com.sun.jersey.version>1.17.1</com.sun.jersey.version>
    <org.codehaus.jackson.version>1.9.12</org.codehaus.jackson.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>com.google.appengine.orm</groupId>
      <artifactId>datanucleus-appengine</artifactId>
      <version>2.1.2</version>
    </dependency>

    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-api-labs</artifactId>
      <version>1.8.1.1</version>
    </dependency>

    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>14.0.1</version>
    </dependency>

    <dependency>
      <groupId>com.google.inject</groupId>
      <artifactId>guice</artifactId>
      <version>${com.google.inject.version}</version>
    </dependency>

    <dependency>
      <groupId>com.google.inject.extensions</groupId>
      <artifactId>guice-servlet</artifactId>
      <version>${com.google.inject.version}</version>
    </dependency>

    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-json</artifactId>
      <version>${com.sun.jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-server</artifactId>
      <version>${com.sun.jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>com.sun.jersey.contribs</groupId>
      <artifactId>jersey-guice</artifactId>
      <version>${com.sun.jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.6</version>
    </dependency>

    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-core-asl</artifactId>
      <version>${org.codehaus.jackson.version}</version>
    </dependency>

    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-jaxrs</artifactId>
      <version>${org.codehaus.jackson.version}</version>
    </dependency>

    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>${org.codehaus.jackson.version}</version>
    </dependency>

    <dependency>
      <groupId>org.datanucleus</groupId>
      <artifactId>datanucleus-api-jdo</artifactId>
      <version>[3.2.0, 3.2.99)</version>
    </dependency>

    <dependency>
      <groupId>org.datanucleus</groupId>
      <artifactId>datanucleus-core</artifactId>
      <version>[3.2.0, 3.2.99)</version>
      <scope>runtime</scope>
    </dependency>

    <dependency>
      <groupId>org.datanucleus</groupId>
      <artifactId>datanucleus-jdo-query</artifactId>
      <version>3.0.2</version>
    </dependency>

    <dependency>
      <groupId>javax.cache</groupId>
      <artifactId>cache-api</artifactId>
      <version>0.61</version>
    </dependency>

    <dependency>
      <groupId>javax.jdo</groupId>
      <artifactId>jdo-api</artifactId>
      <version>3.0.1</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.5</version>
    </dependency>

    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.0.13</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>${project.artifactId}</finalName>

    <plugins>
      <plugin>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-maven-plugin</artifactId>
        <version>3.2.0-release</version>
        <configuration>
          <api>JDO</api>
          <props>${basedir}/datanucleus.properties</props>
<!--           <log4jConfiguration>${basedir}/log4j.properties</log4jConfiguration> -->
          <verbose>true</verbose>
        </configuration>
        <executions>
          <execution>
            <phase>process-classes</phase>
            <goals>
              <goal>enhance</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

在代码的其他地方，我注入了PersistenceManagerFactory并定义了一些简单的持久性注释，这是目前为止我对JDO的唯一引用

我的WEB-INF/jdoconfig.xml几乎就是appengine页面的复制/粘贴：

<?xml version="1.0" encoding="utf-8"?>
<jdoconfig 
    xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig">

  <persistence-manager-factory name="transactions-optional">
    <property name="javax.jdo.PersistenceManagerFactoryClass"
        value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory" />
    <property name="javax.jdo.option.ConnectionURL" value="appengine" />
    <property name="javax.jdo.option.NontransactionalRead" value="true" />
    <property name="javax.jdo.option.NontransactionalWrite" value="true" />
    <property name="javax.jdo.option.RetainValues" value="true" />
    <property name="datanucleus.appengine.autoCreateDatastoreTxns" value="true" />
    <property name="datanucleus.appengine.singletonPMFForName" value="true" />
  </persistence-manager-factory>
</jdoconfig>

DatastoreManager应该在类路径上，但我怀疑我的依赖项可能有问题。我的maven pom文件依赖项如下所示：

public class MyModule extends ServletModule {

@Override
public void configureServlets() {
  bind(PersistenceManagerFactory.class)
      .toInstance(JDOHelper.getPersistenceManagerFactory("transactions-optional"));
  // ...

<properties>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <com.google.inject.version>3.0</com.google.inject.version>
    <com.sun.jersey.version>1.17.1</com.sun.jersey.version>
    <org.codehaus.jackson.version>1.9.12</org.codehaus.jackson.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>com.google.appengine.orm</groupId>
      <artifactId>datanucleus-appengine</artifactId>
      <version>2.1.2</version>
    </dependency>

    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-api-labs</artifactId>
      <version>1.8.1.1</version>
    </dependency>

    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>14.0.1</version>
    </dependency>

    <dependency>
      <groupId>com.google.inject</groupId>
      <artifactId>guice</artifactId>
      <version>${com.google.inject.version}</version>
    </dependency>

    <dependency>
      <groupId>com.google.inject.extensions</groupId>
      <artifactId>guice-servlet</artifactId>
      <version>${com.google.inject.version}</version>
    </dependency>

    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-json</artifactId>
      <version>${com.sun.jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-server</artifactId>
      <version>${com.sun.jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>com.sun.jersey.contribs</groupId>
      <artifactId>jersey-guice</artifactId>
      <version>${com.sun.jersey.version}</version>
    </dependency>

    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.6</version>
    </dependency>

    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-core-asl</artifactId>
      <version>${org.codehaus.jackson.version}</version>
    </dependency>

    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-jaxrs</artifactId>
      <version>${org.codehaus.jackson.version}</version>
    </dependency>

    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>${org.codehaus.jackson.version}</version>
    </dependency>

    <dependency>
      <groupId>org.datanucleus</groupId>
      <artifactId>datanucleus-api-jdo</artifactId>
      <version>[3.2.0, 3.2.99)</version>
    </dependency>

    <dependency>
      <groupId>org.datanucleus</groupId>
      <artifactId>datanucleus-core</artifactId>
      <version>[3.2.0, 3.2.99)</version>
      <scope>runtime</scope>
    </dependency>

    <dependency>
      <groupId>org.datanucleus</groupId>
      <artifactId>datanucleus-jdo-query</artifactId>
      <version>3.0.2</version>
    </dependency>

    <dependency>
      <groupId>javax.cache</groupId>
      <artifactId>cache-api</artifactId>
      <version>0.61</version>
    </dependency>

    <dependency>
      <groupId>javax.jdo</groupId>
      <artifactId>jdo-api</artifactId>
      <version>3.0.1</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.5</version>
    </dependency>

    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.0.13</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>${project.artifactId}</finalName>

    <plugins>
      <plugin>
        <groupId>org.datanucleus</groupId>
        <artifactId>datanucleus-maven-plugin</artifactId>
        <version>3.2.0-release</version>
        <configuration>
          <api>JDO</api>
          <props>${basedir}/datanucleus.properties</props>
<!--           <log4jConfiguration>${basedir}/log4j.properties</log4jConfiguration> -->
          <verbose>true</verbose>
        </configuration>
        <executions>
          <execution>
            <phase>process-classes</phase>
            <goals>
              <goal>enhance</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

1.7
1.7
3
1.17.1
1.9.12
com.google.appengine.orm
datanucleus appengine
2.1.2
com.google.appengine
阿彭金api实验室
1.8.1.1
番石榴
番石榴
14.0.1
com.google.inject
圭斯
${com.google.inject.version}
com.google.inject.extensions
guice servlet
${com.google.inject.version}
泽西岛
泽西json
${com.sun.jersey.version}
泽西岛
泽西服务器
${com.sun.jersey.version}
com.sun.jersey.contribs
泽西基斯
${com.sun.jersey.version}
公地郎
公地郎
2.6
org.codehaus.jackson
jackson core asl
${org.codehaus.jackson.version}
org.codehaus.jackson
杰克逊·贾克斯
${org.codehaus.jackson.version}
org.codehaus.jackson
杰克逊地图绘制者
${org.codehaus.jackson.version}
org.datanucleus
datanucleus api jdo
[3.2.0, 3.2.99)
org.datanucleus
数据核核心
[3.2.0, 3.2.99)
运行时
org.datanucleus
datanucleus jdo查询
3.0.2
javax.cache
缓存api
0.61
javax.jdo
jdoapi
3.0.1
javax.servlet
servlet api
2.5
假如
javax.servlet
jstl
1.2
假如
javax.servlet.jsp
jsp api
2.2
假如
org.slf4j
slf4j api
1.7.5
回写
回归经典
1.0.13
${project.artifactId}
org.datanucleus
datanucleus maven插件
3.2.0-发布
JDO
${basedir}/datanucleus.properties
符合事实的
进程类
增强

---

我肯定我错过了一些明显的错误，但作为appengine和JDO的新手，我现在迷路了。

我遇到了一个类似的“ClassNotFound”异常，即使我使用的类在同一个包中……为什么不回到最初的Google appengine SDK，看看“datanucleus…”它为您打包的jar？它们不是v3.2.x。这是否是您的问题的根源尚不清楚，但不建议只是离开并覆盖为您设置的内容