Failing to create new PoolingHttpClientConnectionManager
Solution 1
Do you also have httpcore jar? (version 4.3 as well) I've found that class there.
Solution 2
The org.apache.http.config.Lookup class is not in httpclient-4.3.1.jar. It is in httpcore-4.3.jar.
If you are not using Maven, to understand the httpclient dependencies, see http://hc.apache.org/httpcomponents-client-4.3.x/httpclient/dependencies.html
Solution 3
Maybe you forgot to include/download HttpCore
http://hc.apache.org/downloads.cgi
Admin
Updated on June 05, 2022Comments
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Admin almost 2 years
My program contains the following line, and just hangs at this point, and I'm not quite sure why.
PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
When debugging in Eclipse, if I try to evaluate "new PoolingHttpClientConnectionManager()" in the Display view I get these errors:
java.lang.NoClassDefFoundError: org/apache/http/config/Lookup at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) ...omitted - referring to specific lines in code... at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.apache.http.config.Lookup 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) ... 10 more
I am using httpclient.jar version 4.3.1 from org.apache.httpcomponents.
Anyone else experience this problem? Any solution? Or am I doing something silly?