使用 Google App Engine 的 Eclipse 中的 NoClassDefFoundError HttpTransport

Question

我在一个旧项目上从已弃用的文件 API 切换到新的 Cloud Storage Client Library，似乎存在依赖关系问题。我没能让 Maven 正常工作，所以我手动安装了所需的 jar。我可以编译运行我的 servlet，但是当我尝试通过 DriverManager.getConnection():

访问 Cloud SQL 时出现此运行time 错误

java.lang.NoClassDefFoundError: com/google/api/client/http/HttpTransport

HttpTransport 应该在哪个 jar 中？

如何检查我上传到 Google 的 war 是否包含它？

我的 war/WEB-INF/lib 和 Java 构建路径库中都有所有这些：

From App Engine SDK:
    appengine-api-1.0-sdk-1.9.25.jar
    appengine-api-labs.jar
    appengine-api.jar
    appengine-endpoints-deps.jar
    appengine-endpoints.jar
    appengine-jsr107cache-1.9.25.jar
    appengine-jsr107cache.jar
    datanucleus-appengine-1.0.10.final.jar
    datanucleus-core-1.1.5.jar
    datanucleus-jpa-1.1.5.jar
    geronimo-jpa_3.0_spec-1.1.1.jar
    geronimo-jta_1.1_spec-1.1.1.jar
    jdo2-api-2.3-eb.jar
    jsr107cache-1.1.jar

The Cloud Storage Client Library:
    appengine-gcs-client-0.4.4.jar

Dependencies of the Cloud Storage Client Library:
    guava-18.0.jar
    joda-time-2.8.2.jar
    google-api-services-storage-v1beta2-rev77-1.20.0.jar

For good measure, every jar from the Cloud Storage API libs:
    commons-logging-1.1.1.jar
    google-api-client-1.20.0.jar
    google-api-client-1.20.0.jar.properties
    google-api-client-android-1.20.0.jar
    google-api-client-android-1.20.0.jar.properties
    google-api-client-appengine-1.20.0.jar
    google-api-client-gson-1.20.0.jar
    google-api-client-jackson2-1.20.0.jar
    google-api-client-java6-1.20.0.jar
    google-api-client-servlet-1.20.0.jar
    google-http-client-1.20.0.jar
    google-http-client-1.20.0.jar.properties
    google-http-client-android-1.20.0.jar
    google-http-client-android-1.20.0.jar.properties
    google-http-client-appengine-1.20.0.jar
    google-http-client-gson-1.20.0.jar
    google-http-client-gson-1.20.0.jar.properties
    google-http-client-jackson2-1.20.0.jar
    google-http-client-jackson2-1.20.0.jar.properties
    google-http-client-jdo-1.20.0.jar
    google-http-client-jdo-1.20.0.jar.properties
    google-oauth-client-1.20.0.jar
    google-oauth-client-1.20.0.jar.properties
    google-oauth-client-appengine-1.20.0.jar
    google-oauth-client-java6-1.20.0.jar
    google-oauth-client-jetty-1.20.0.jar
    google-oauth-client-servlet-1.20.0.jar
    gson-2.1.jar
    gson-2.1.jar.properties
    httpclient-4.0.1.jar
    httpcore-4.0.1.jar
    jackson-core-2.1.3.jar
    jackson-core-2.1.3.jar.properties
    jdo2-api-2.3-eb.jar
    jetty-6.1.26.jar
    jetty-util-6.1.26.jar
    jsr305-1.3.9.jar
    transaction-api-1.1.jar

Answer 1

com/google/api/client/http/HttpTransport 是 appengine-tools-api.jar

的一部分

Answer 2

看起来它与 jar 文件、类路径或云存储无关。该应用程序使用旧的云 SQL rdbms 连接方法，我不知道该方法已被弃用：

DriverManager.registerDriver(new AppEngineDriver());
Connection conn = DriverManager.getConnection("jdbc:google:rdbms://incredipede:instance/incredipede");

我了解到对 registerDriver 的调用失败了，所以当我调用 getConnection() 时所需的类不可用。切换到新的 mysql 连接和 Class.forName() 方法有效：

Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:google:mysql://incredipede:instance/incredipede?user=root");

Also must add this to appengine-web.xml:
<use-google-connector-j>true</use-google-connector-j>

顺便说一句，我注意到在 eclipse 中输入应用引擎实例名称（项目 > 属性 > google > 应用引擎 > google 云 sql > 应用引擎 sql instance) 即使在新项目中也会弹出类似的 HttpTransport 错误。这可能是 appengine eclipse 插件或 appengine 1.9.25 中的错误...我怀疑这些错误是旧连接方法的预期行为，是否已弃用。

使用 Google App Engine 的 Eclipse 中的 NoClassDefFoundError HttpTransport

NoClassDefFoundError HttpTransport in Eclipse using Google App Engine

java

eclipse

google-app-engine

google-cloud-storage

google-cloud-sql