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Apache HttpClient throws a NoClassDefFoundError

I have: ubuntu-9.10-desktop-amd64 + NetBeans6.7.1

  1. I just downloaded "Commons HttpClient 3.1 (legacy)" from http://hc.apache.org/downloads.cgi .
  2. I created new application with IDE NetBeans.
  3. I focused on Projects -> Libraries -> Add JAR/Folder and here added commons-httpclient-3.1.jar
  4. By now, I can write "import org.apache.commons.httpclient.*;" This is OK.
  5. But, if I try to add any statement included something like this:

    public static void main(String[] args) {
        HttpClient client = new HttpClient();
    }
    
  6. It is compiled well.

  7. 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.

like image 537
rauch Avatar asked Nov 21 '09 19:11

rauch


3 Answers

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.

like image 122
mhaller Avatar answered Sep 19 '22 16:09

mhaller


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.

like image 41
bmargulies Avatar answered Sep 23 '22 16:09

bmargulies


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.

like image 44
oalmgren Avatar answered Sep 21 '22 16:09

oalmgren