我正在开发一个 java 项目，该项目直到几天前才开始工作。我不确定我对 Eclipse 设置做了什么来控制它，但现在当我尝试运行一些访问 google Finance api 的代码时，我收到了 java.lang.ClassNotFoundException 。我已经构建了一个小型测试应用程序，它单独使用 google Finance api，并且似乎有效。所以，我认为这是一个项目特定的问题。任何帮助将不胜感激。这是堆栈跟踪：
ptolemy.kernel.util.IllegalActionException: in .RandomSearch.manager
Because:
com/google/common/collect/Maps
at ptolemy.actor.Manager.execute(Manager.java:472)
at ptolemy.actor.Manager.run(Manager.java:1119)
at ptolemy.actor.Manager$3.run(Manager.java:1160)
Caused by: java.lang.NoClassDefFoundError: com/google/common/collect/Maps
at com.google.gdata.wireformats.AltRegistry.<init>(AltRegistry.java:118)
at com.google.gdata.wireformats.AltRegistry.<init>(AltRegistry.java:100)
at com.google.gdata.client.Service.<clinit>(Service.java:546)
at AtomicBroadcast.GoogleFinance.GooglePortfolioReader.fire(GooglePortfolioReader.java:108)
at ptolemy.domains.de.kernel.DEDirector.fire(DEDirector.java:568)
at ptolemy.actor.CompositeActor.fire(CompositeActor.java:458)
at ptolemy.actor.Manager.iterate(Manager.java:714)
at ptolemy.actor.Manager.execute(Manager.java:349)
... 2 more
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Maps
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
... 10 more
Caused by: java.lang.NoClassDefFoundError: com/google/common/collect/Maps
at com.google.gdata.wireformats.AltRegistry.<init>(AltRegistry.java:118)
at com.google.gdata.wireformats.AltRegistry.<init>(AltRegistry.java:100)
at com.google.gdata.client.Service.<clinit>(Service.java:546)
at AtomicBroadcast.GoogleFinance.GooglePortfolioReader.fire(GooglePortfolioReader.java:108)
at ptolemy.domains.de.kernel.DEDirector.fire(DEDirector.java:568)
at ptolemy.actor.CompositeActor.fire(CompositeActor.java:458)
at ptolemy.actor.Manager.iterate(Manager.java:714)
at ptolemy.actor.Manager.execute(Manager.java:349)
at ptolemy.actor.Manager.run(Manager.java:1119)
at ptolemy.actor.Manager$3.run(Manager.java:1160)
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Maps
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
... 10 more
看来你的项目类路径缺少google-collect-1.0-rc1.jar
显然你的硬盘上有它，只需编辑项目类路径并将其添加到那里（或者确保它由 Maven/此类添加，如果你使用它们）。
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