Apache HttpClient throws a NoClassDefFoundError
Solution 1
What you are experiencing is just a missing dependency. Java developers are used to gather their dependencies themselves, esp. when it comes to logging frameworks. Download commons-logging and add it to your classpath. Do as well with all other dependencies required by httpclient.
Solution 2
You need the dependencies. If you used maven, they would fetch themselves. Since you aren't, you've got to go download commons-logging (and perhaps others) and toss them in.
Solution 3
I'd like to update anyone coming here to the fact that all answers, and especially RocketSurgeon's, helped me solve my issue in the same sense. I had to download commons httpclient (legacy 3.1), logging and codec before my issues were resolved.
Also of note; using Eclipse I had to extract the .jar-files and import them into Buildpath using "add library". Did not work with only adding .zip-file.
rauch
Updated on July 09, 2022Comments
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rauch almost 2 years
I have: ubuntu-9.10-desktop-amd64 + NetBeans6.7.1
- I just downloaded "Commons HttpClient 3.1 (legacy)" from http://hc.apache.org/downloads.cgi .
- I created new application with IDE NetBeans.
- I focused on Projects -> Libraries -> Add JAR/Folder and here added commons-httpclient-3.1.jar
- By now, I can write "import org.apache.commons.httpclient.*;" This is OK.
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But, if I try to add any statement included something like this:
public static void main(String[] args) { HttpClient client = new HttpClient(); }
It is compiled well.
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But when I run this project, I receive the following errors:
***Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory at org.apache.commons.httpclient.HttpClient.<clinit>(HttpClient.java:66) at SimplestAppl.Main.main(Main.java:22) Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:319) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:264) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332) ... 2 more Java Result: 1***
What is wrong?
I tried to download "HttpClient 4.0 (GA)". But the result was same.
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tricknology about 9 yearsAlso, make sure you're using /Project/WebContent/WEB-INF/lib/