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/jcommand

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

May be testng.jar is not in classpath.

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.

Answer 4

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 5

The problem here is that certain versions of the testNG jar do not have the jcommander jar code inside of them. As a result, you have to add the classpath to the Jcommander jar separately.

Adding the Jcommander jar to your classpath when you run it will fix the problem, hopefully

Answer 6

My ant start working when I have downloaded jcommandar jar from Maven repository and added it in my jar file

But This problem Starts coming with testng 6.8.5 version