From Java, you can call Python function which creates a new e-mail for testing.

test_data.py

'''
Created on Apr 8, 2014

@author: gunesmes@yahoo.com
'''


# -*- coding: utf8 -*-
import datetime, os
#import config

os.chdir("D:/workspace/projectname/test-output")   

class TestData():    
    def createEmail(self):
        emailBase   = "username"
        emailSup    = "gmail.com"

        # read the text file as a list of lines
        # find the last line, change to a file you have 
        data = open('numberRun.txt', "r")        
        lineList = data.readlines()
        
        now = datetime.datetime.now()
        
        #first time running, empty list
        if len(lineList) == 0:
            lastLineList = ('0' + ',' + emailBase + ',' + str(now.strftime("%Y-%m-%d %H:%M")) + ',' + 'False')
        else:
            lastLineList = lineList[len(lineList)-1]
       
        (lastUsedNumber, lastUsedEmail, Date, isRegistered) = lastLineList.split(",")
        lastUsedNumber2 = lastUsedNumber.replace("(", "")
        newEmail = (emailBase + '+' + str(int(lastUsedNumber2) + 1) + '@' + emailSup)
        data.close()
        
        data = open('./numberRun.txt', "a")
        now = datetime.datetime.now()
        newEmailFull = int(lastUsedNumber2)+1, str(newEmail), str(now.strftime("%Y-%m-%d %H:%M")), "YES"
        data.write(str(newEmailFull))
        data.write("\n")
        data.close()
        #print newEmailFull

        return newEmail
    
    def get_number_of_run(self):
        # read the text file as a list of lines
        # find the last line, change to a file you have    
        data = open('numberRun.txt', "r")        
        lineList = data.readlines()
        lastLineList = lineList[len(lineList)-1]

        (lastUsedNumber, lastUsedEmail, Date, isRegistered) = lastLineList.split(",")
        lastUsedNumber2 = lastUsedNumber.replace("(", "")
        data.close()
        
        return lastUsedNumber2               
        
    

m = TestData()
result = m.createEmail()

testCases.java

import org.python.antlr.ast.Str;
import org.python.core.PyObject;
import org.python.util.PythonInterpreter;

public class ProjectName{

  public String createEmail() {
       	PythonInterpreter python = new PythonInterpreter();
       	// full path of the python file
	python.execfile("D:\\workspace\\pojectname\\src\\com\\base\\test_data.py");
	PyObject epost = python.get("result");	
	String eposta = epost.toString();
	
	System.out.printf("		* New e-mail is created: %s\n", eposta);
	
	return eposta;
	}
 }