Using Python------------------------------ import os import subprocess print(os.getcwd()) cmd = "java -cp 'bin/*:../GATEFiles/lib/*:../GATEFiles/bin/gate.jar:lib/*' code4goal.antony.resumeparser.ResumeParserProgram %s %s.json" % (r'C:\Data Science\ResumeParser-master\ResumeParser\Data\Input\Synechron_Candidate_Sandip Shinde.docx', r'C:\Data Science\ResumeParser-master\ResumeParser\Data\Output\Sandip.json') print(cmd) os.chdir(r"C:\Data Science\ResumeParser-master\ResumeParser\ResumeTransducer") process = subprocess.Popen(cmd) out, err = process.communicate() exitcode = process.returncode print(out, exitcode) print ('Ok') Error: Could not find or load main class code4goal.antony.resumeparser.ResumeParserProgram