java.lang.NoClassDefFoundError的错误，当我尝试实例化的GCS服务 [英] java.lang.NoClassDefFoundError error when I try to instantiate the GCS Service
问题描述
我很新的的Java / Android开发。我选择的IDE的是Android工作室。基本上我需要的图像/ vidoes剪辑和音频剪辑上传到GCS。我实例化服务，像这样
I am very new to java/Android development. My IDE of choice is Android Studio. Essentially I need to upload images/vidoes clips and audio clips to GCS. I am instantiating the service like this
最终GcsService gcsService => GcsServiceFactory.createGcsService（RetryParams.getDefaultInstance（））;
当我运行应用程序我碰到下面的错误
java.lang.NoClassDefFoundError的：com.google.appengine.api.utils.SystemProperty
在>com.google.appengine.tools.cloudstorage.GcsServiceFactory.createRawGcsService(GcsServiceFact>ory.java:40)
在>com.google.appengine.tools.cloudstorage.GcsServiceFactory.createGcsService(GcsServiceFactory>.java:34)
在> com.horcu.lme.gavi.cloud.CloudPersister.downloadDataFromGcs（CloudPersister.java:30）
在> com.horcu.lme.gavi.MainActivity $ PlaceholderFragment.onCreateView（MainActivity.java:159）
我的build.gradle文件的相关性部分看起来像这样
" final GcsService gcsService = >GcsServiceFactory.createGcsService(RetryParams.getDefaultInstance());"
When I run the app I get the following error
java.lang.NoClassDefFoundError: com.google.appengine.api.utils.SystemProperty at >com.google.appengine.tools.cloudstorage.GcsServiceFactory.createRawGcsService(GcsServiceFact>ory.java:40) at >com.google.appengine.tools.cloudstorage.GcsServiceFactory.createGcsService(GcsServiceFactory>.java:34) at >com.horcu.lme.gavi.cloud.CloudPersister.downloadDataFromGcs(CloudPersister.java:30) at >com.horcu.lme.gavi.MainActivity$PlaceholderFragment.onCreateView(MainActivity.java:159)
The dependency section of my build.gradle file looks like this
依赖性{
编译com.android.support:support-v4:19.0.1
编译com.android.support:appcompat-v7:19.0.1
编译文件树（导演：'库'，包括：['的* .jar']）
编译com.google.guava：番石榴集合：R03 @罐子
编译com.google.appengine.tools:appengine-gcs-client:0.3.3@jar
编译公地IO：公地IO：20030203.000550@jar
dependencies { compile 'com.android.support:support-v4:19.0.1' compile 'com.android.support:appcompat-v7:19.0.1' compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.google.guava:guava-collections:r03@jar' compile 'com.google.appengine.tools:appengine-gcs-client:0.3.3@jar' compile 'commons-io:commons-io:20030203.000550@jar'
}
正如你可以看到我，包括AppEngine上-GCS-客户端jar文件，并将它编译得很好，但在运行时崩溃。
任何人都可以提出此修复？
As you can see I am including the appengine-gcs-client jar file and it compiles just fine but crashes at run-time. Can anyone suggest a fix for this?
推荐答案
这通常意味着你缺少的依赖关系。需要注意的是GCS需要更多的则只是AppEngine上-GCS-客户端jar。首先，我认为，这需要乔达-time.jar。
This usually means that you are missing dependencies. Note that GCS requires more then just the appengine-gcs-client jar. For one thing, I think it requires joda-time.jar.
此外，使用API的是不能作为应用程序引擎中的服务通常需要谷歌的Java客户端库，你有吗？结果
的https：//$c$c.google.com/p/谷歌的API-Java的客户端/
Also, using the API's that are not available as services within app engine typically requires the Google Java client library, do you have that?
https://code.google.com/p/google-api-java-client/
最后，我想指出，你有上面的错误是com.google.appengine.api.utils.SystemProperty，这实际上是应用程序引擎本身的一部分。你有没有在App Engine JAR的？我没有用过Android的工作室，但我不会指望你必须添加应用程序引擎JAR的手动 - 当你创建应该已经自动添加一个App Engine项目
Finally, I would note that the error you have above is for "com.google.appengine.api.utils.SystemProperty" which is actually part of app engine itself. Do you have the app engine JAR's? I haven't used Android Studio but I wouldn't expect you to have to add the app engine JAR's manually - when you created an app engine project that should have been added automatically.
如果你没有结婚到Android工作室，你可能要考虑的Eclipse ADT +，所有这些都是为你做。谷歌曾表示，Android的工作室将支持GAE，但它甚至没有发布针对Android还没有，更不用说应用程序引擎。
If you aren't wed to Android Studio, you might want to consider Eclipse + ADT where all of this is done for you. Google has said that Android STudio will support GAE, but it's not even released for Android yet, let alone app engine.
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