I am trying to execute an external java program from a python 3.7 program using the java command with classpath. I am using subprocess.Popen module in Python. Somehow I am not able to get it working! Appreciate any assistance!
cmd = ['java',
'-classpath', 'C:/Users/Documents/MqTransfer.jar', 'C:/Users/Documents/com.ibm.mq.commonservices.jar',
'C:/Users/Documents/com.ibm.mq.headers.jar', 'C:/Users/Documents/com.ibm.mq.jar',
'C:/Users/Documents/com.ibm.mq.jmqi.jar', 'C:/Users/Documents/com.ibm.mq.pcf.jar',
'C:/Users/Documents/connector.jar', 'C:/Users/Documents/xerces.jar',
'MyMqTransfer', 'C:/Users/Documents/queueTransfer.properties']
jproc = subprocess.Popen(cmd, stdout=PIPE, stderr=PIPE)
output, errors = jproc.communicate()
print(output, errors)
I am getting the below error
b'' b'Error: Could not find or load main class C:.Users.Documents.com.ibm.mq.commonservices.jar\\r\\n'
When I try to run the java program from my batch script it runs fine! This is the command I use in my batch script. The issue is with my python code!
java -classpath MqTransfer.jar;com.ibm.mq.commonservices.jar;com.ibm.mq.headers.jar;com.ibm.mq.jar;com.ibm.mq.jmqi.jar;com.ibm.mq.pcf.jar;connector.jar;xerces.jar com.ibm.my.mq.MyMqTransfer C:\Users\Documents\queueTransfer.properties
Based on the error, I believe the process being executed is something like 'java -classpath C:/Users/Documents/MqTransfer.jar c:/Users/Documents/com.ibm.mq.commonServices.jar [followed by the rest of the arguments you are passing to process]' such that java is passed MqTransfer.jar as the entire classpath argument and thinks 'C:.Users.Documents.com.ibm.mq.commonservices.jar' is your class to launch. Try combining your entire intended classpath into the 3rd argument of your launch and I think you will be good. It would look something like this:
cmd = ['java', '-classpath', 'C:/Users/Documents/MqTransfer.jar;C:/Users/Documents/com.ibm.mq.commonservices.jar;C:/Users/Documents/com.ibm.mq.headers.jar;C:/Users/Documents/com.ibm.mq.jar;C:/Users/Documents/com.ibm.mq.jmqi.jar;C:/Users/Documents/com.ibm.mq.pcf.jar;C:/Users/Documents/connector.jar;C:/Users/Documents/xerces.jar', 'MyMqTransfer', 'C:/Users/Documents/queueTransfer.properties']
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