Suddenly can't run TestNG tests from ant ([testng] Caused by: java.lang.ClassNotFoundException: com.beust.jcommander.ParameterException)

Question

I am using ant and TestNG 6.1.1, and I had my tests working just fine yesterday. Today when I try to run the tests I get a NoClassDefFoundError involving com/beust/jcommander/ParamException. Here is the output:

[copy] Copying 1 file to /Users/djohnson/src/webapp/components/build/tmp
[testng] Exception in thread "main" java.lang.NoClassDefFoundError: com/beust/jcommander/ParameterException
[testng] Caused by: java.lang.ClassNotFoundException: com.beust.jcommander.ParameterException
[testng]    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
[testng]    at java.security.AccessController.doPrivileged(Native Method)
[testng]    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[testng]    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[testng]    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[testng]    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[testng] The tests failed.

Here is the .xml file I'm using:

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="Single Method Suite">
  <test name="Single Method Test">
    <classes>
      <class name="DhcpTest">
        <methods>
          <exclude name=".*" />
          <include name="setGetEnabledTest" />
        </methods>
      </class>
    </classes>
  </test>
</suite>

I've also specified the complete path for the class with no luck. I've checked the classpath and everything seems fine, does anyone have any ideas on this?

Answer 1

If you're using ant, JCommander should be inside testng.jar, so I'm thinking your testng.jar file might be corrupt.

Answer 2

If your using Maven try adding this to your pom.xml

<dependency>
  <groupId>com.beust</groupId>
  <artifactId>jcommander</artifactId>
  <version>1.30</version>
</dependency>

Answer 3

jcommander.jar (e.g. jcommander-1.29.jar) should be present on fileset directory which is mentioned at build.xml

You can download it from: http://mvnrepository.com/artifact/com.beust/jcommander/1.27

OR,

JCommander should be inside testng.jar during using ant. Your testng.jar file might be corrupted, so please replace old testng.jar by new one.