java - Eclipse 中的 Google 数据(gdata)与应用程序引擎，java

Question

我以前也有过类似的问题，当这个问题解决的时候就出现了。所以我们又来了。

doGet 的内容几乎可以工作，但是当我尝试将它作为 eclipse 为我创建的 servlet 的一部分时，我收到错误。看起来有点像我没有在库中引用适当的文件，但我想我有。

java代码如下所示:

package picasatest;

import java.io.IOException;
import java.net.URL;
import javax.servlet.http.*;
import com.google.gdata.client.photos.PicasawebService;
import com.google.gdata.data.photos.AlbumEntry;
import com.google.gdata.data.photos.UserFeed;

@SuppressWarnings("serial")
public class PicasaTestServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws IOException {
    resp.setContentType("text/plain");

    try {
        PicasawebService service = new PicasawebService("Picasa test");
        service.setUserCredentials("username@gmail.com", "password");
        URL feedURL = new URL("http://picasaweb.google.com/data/feed/api/user/username?kind=album");
        UserFeed feed = service.getFeed(feedURL, UserFeed.class);
        for (AlbumEntry entry : feed.getAlbumEntries()) {
             System.out.println(entry.getTitle().getPlainText());
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

我引用了google-collect-1.0-rc2.jar、mail.jar、activation.jar、servlet-api.jar、gdata-client.jar、gdata-client-meta.jar、gdata-core.jar 、gdata-media.jar、gdata-photos-2.0.jar 和 gdata-photos-meta-2.0.jar 根据 google 的说明。我还需要做什么才能使其正常工作吗？

我在控制台收到此错误:

java.lang.NoClassDefFoundError: com/google/gdata/client/photos/PicasawebService
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357)
at java.lang.Class.getConstructor0(Class.java:2671)
at java.lang.Class.newInstance0(Class.java:321)
at java.lang.Class.newInstance(Class.java:303)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:124)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:313)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)

知道我错过了什么吗？

Answer 1

感谢 Google 小组“Google App Engine for Java”的 Jason Parekh

Where is your GData client JAR located? It should be in the war/WEB-INF/lib directory for it to be included in the packaged war file. jason

所以你不应该像我一样将整个 gdata 文件夹放在 war/WEB-INF 中...... 问题已解决