Java：java.lang.NoClassDefFoundError：org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager

Question

I created a webservice using servlet and Tomcat 6.0. I created a java project in eclipse to call that webservice using HTTP.
I added the following jar files
1. httpcore-4.0
2. httpclient-4.0
but while running the project im getting the following error.

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager.<init>(ThreadSafeClientConnManager.java:75)
at WSCall.HttpUtilities.GetServerResponse(HttpUtilities.java:52)
at WSCall.ServiceCall.main(ServiceCall.java:16)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
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)
... 3 more    

Please help me to find the solution.

Answer 1

It seems your project doesn't contain the Apache Commons Logging library . Adding it to your classpath should do the trick.

Answer 2

这是由于缺少commons-logging.jar造成的。要解决此问题，请下载commons日志库并将其添加到您的项目中。

Answer 3

You still have to add common-logging dependency under your classpath. However, you may continue encounter other simaliar Exceptions due to lack other dependency. I suggest you use maven to manage the dependency so that you don't have to mannualy add dependencies to your classpath.