Twitter4J 在 TwitterFactory 中抛出异常
我正在尝试通过 oauth 访问 twitter。因此，我注册了我的应用程序，下载了 Twitter4j，在我的 Eclipse-Project 中添加了 jar，然后尝试执行以下代码：
Twitter twitter = new TwitterFactory().getOAuthAuthorizedInstance("[key]","[secretKey]");
RequestToken requestToken = twitter.getOAuthRequestToken();
System.out.println(requestToken.getAuthorizationURL());
但它引发了以下异常：
[Sat May 29 11:19:11 CEST 2010]Using class twitter4j.internal.logging.StdOutLoggerFactory as logging factory.
[Sat May 29 11:19:11 CEST 2010]Use twitter4j.internal.http.alternative.HttpClientImpl as HttpClient implementation.
Exception in thread "main" java.lang.AssertionError: java.lang.reflect.InvocationTargetException
at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:71)
at twitter4j.internal.http.HttpClientWrapper.<init>(HttpClientWrapper.java:59)
at twitter4j.http.OAuthAuthorization.init(OAuthAuthorization.java:83)
at twitter4j.http.OAuthAuthorization.<init>(OAuthAuthorization.java:74)
at twitter4j.TwitterFactory.getOAuthAuthorizedInstance(TwitterFactory.java:112)
at MainProgram.main(MainProgram.java:18)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:65)
... 5 more
Caused by: java.lang.NoClassDefFoundError: org/apache/http/impl/client/DefaultHttpClient
at twitter4j.internal.http.alternative.HttpClientImpl.<init>(HttpClientImpl.java:63)
... 10 more
我目前无法弄清楚为什么......你能给出我一些建议？
此致 菲利普
i'm trying to access twitter via oauth. Therefore, i registered my app, downloaded Twitter4j, added the jars in my Eclipse-Project, and then tried to execute the following code:
Twitter twitter = new TwitterFactory().getOAuthAuthorizedInstance("[key]","[secretKey]");
RequestToken requestToken = twitter.getOAuthRequestToken();
System.out.println(requestToken.getAuthorizationURL());
But it raises the following exception:
[Sat May 29 11:19:11 CEST 2010]Using class twitter4j.internal.logging.StdOutLoggerFactory as logging factory.
[Sat May 29 11:19:11 CEST 2010]Use twitter4j.internal.http.alternative.HttpClientImpl as HttpClient implementation.
Exception in thread "main" java.lang.AssertionError: java.lang.reflect.InvocationTargetException
at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:71)
at twitter4j.internal.http.HttpClientWrapper.<init>(HttpClientWrapper.java:59)
at twitter4j.http.OAuthAuthorization.init(OAuthAuthorization.java:83)
at twitter4j.http.OAuthAuthorization.<init>(OAuthAuthorization.java:74)
at twitter4j.TwitterFactory.getOAuthAuthorizedInstance(TwitterFactory.java:112)
at MainProgram.main(MainProgram.java:18)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:65)
... 5 more
Caused by: java.lang.NoClassDefFoundError: org/apache/http/impl/client/DefaultHttpClient
at twitter4j.internal.http.alternative.HttpClientImpl.<init>(HttpClientImpl.java:63)
... 10 more
I currently can't figure out why ... can you please give me some suggestions?
Best regards
Philipp
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您需要将 apache http 组件添加到您的类路径中
You need to add apache http components to your classpath
因为我读到了“eclipse 项目” - 如果这实际上是一个插件/rcp 项目，并且您的库驻留在其他插件中，那么您必须通过 plugin.xml 导出所需的包，否则将导致 NoClassDefFound 错误。
For I read 'eclipse project' - if this is actually a plugin/rcp project and your libraries reside in other plugins, then you have to export the required packages via plugin.xml, otherwise it will result in NoClassDefFound errors.