"main"java.lang.NoClassDefFoundError:org/apache/http/HttpEntity

Question

我正在尝试在我的项目中使用apache http库.我在我的项目http://imgur.com/WvwqcDS中导入了libreries

当我运行我的程序时,我收到此错误:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/HttpEntity
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
        at java.lang.Class.getMethod0(Unknown Source)
        at java.lang.Class.getMethod(Unknown Source)
        at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.http.HttpEntity
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 6 more

Answer 1

ClassLoader找不到org.apache.http.HttpEntity,它应该在"httpcore-4.3.jar"里面.将jar作为存档打开并验证它是否包含org/apache/http/HttpEntity.class.如果是,则问题出在您的启动配置中.在Eclipse中,转到Run> Run Configurations ...并找到主类的Java Application概要文件(根据屏幕截图,它应该是包含"Launcher"项目中main方法的类).在Classpath选项卡下,您应该看到列出的库jar.

如果没有,请返回导航窗格中的"启动器"项目,右键单击并选择"属性",转到"构建路径",删除罐子,按"确定",然后返回并再次添加(以保证日食)元数据很新鲜).此外,在"订购和导出"选项卡下,最好检查所有罐子,以便如果您将Launcher作为另一个项目的依赖项包含,则可以传递包含罐子.