NoClassDefFoundError for an imported json library

[Harsh Bhasin]

Hello Everyone,

I have run into into some weird runtime error. I have a json data file that I am trying to parse into my code . I am using json-simple-1.1.1.jar external library that I have added to my classpath and verified that it exists there by doing echo $CLASSPATH.

When I compile my code using javac codeTest.java the program compiles with no issues .

But when I try to run the program using java -classpath . codeTest I am receiveing the error : java.lang.NoClassDefFoundError: org/jason/simple/parser/ParseException.

I have opened the json-simple-1.1.1.jar folder and verified that ParseException.class does exist in the folder.

If I run the code without the class path (i.e. java codeTest) then I am receiving "could not find or load main class codeTest", which is expected.

Please help me troubleshoot this.

Thank you

my code snippet :

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class codeTest
{
  	
	public static void main(String[] args)
	{
            JSONParser jsonParser = null;
      	   JSONObject jsonObject = null ;
      	   JSONArray jsonArray = null;
	   JSONObject structure = null;

	   try
	   {
		jsonParser =  new JSONParser();
	       jsonObject = (JSONObject) jsonParser.parse(reader);
	       jsonArray = (JSONArray) jsonObject.get("data"); 	
	       structure = (JSONObject)jsonObject.get("traces");
           }
           catch(IOException iex)
	   {
		System.out.println(iex);
	   }
	   catch(ParseException pex)
           {
	     System.out.println("Exeption parsing json file: " + pex);
	   }
      }
}	

[Rob Spoor]

Welcome to the Ranch!

Harsh Bhasin wrote:java -classpath . codeTest

There's your problem - the library may exist, but the JVM is not using it. By specifying the classpath as ., you're saying it's the current directory, and nothing else. Current directory means class files in the current directory (including package structure), but JAR files in the same directory are not included. You need to add that as well: java -classpath .;json-simple-1.1.1.jar codeTest (assuming you're on Windows, otherwise replace the ; with a :).

[Harsh Bhasin]

Thank you so much Rob. I knew it had to be something simple but just could not figure out what it was.

I really appreciate it.

[Rob Spoor]

You're welcome.