I recently upgraded from version 0.7 to 1.1.1
This can be recreated in Windows and Linux (Amazon Ec2).

The log.info is not working in 1.1.1 from a Groovy script.
It did work in nifi 0.7 with groovy script 'ExecuteScript processor'.

I fed the ExecuteScript with a Generate Flow File processor.
Here is the test script I used to prove it: 6 lines...

log.info("Hello from Groovy!") ;
def flowFile = session.get();
if (!flowFile) return;

flowFile = session.putAttribute(flowFile, 'my-property', 'my-value');
session.transfer(flowFile, REL_SUCCESS)

Here is the output I get:
(snippets from the nifi-app.log's)

version 0.7.1 windows
2017-02-09 10:29:28,810 INFO [StandardProcessScheduler Thread-4] o.a.n.c.s.TimerDrivenSchedulingAgent Scheduled GenerateFlowFile[id=603b4bc8-ca9b-48b9-abb8-11967b6f28bf] to run with 1 threads
2017-02-09 10:29:31,643 INFO [StandardProcessScheduler Thread-1] o.a.n.c.s.TimerDrivenSchedulingAgent Scheduled ExecuteScript[id=e2fa6e2b-caa5-40af-be1c-d265b2509941] to run with 1 threads
2017-02-09 10:29:32,791 INFO [Timer-Driven Process Thread-2] o.a.nifi.processors.script.ExecuteScript ExecuteScript[id=e2fa6e2b-caa5-40af-be1c-d265b2509941] Hello from Groovy!

version 1.1.1 windows
no log.info() results outputted in nifi-app.log

2017-02-09 10:44:53,390 INFO [StandardProcessScheduler Thread-3] o.a.n.c.s.TimerDrivenSchedulingAgent Scheduled GenerateFlowFile[id=f6d91eaa-100c-115a-957e-f0f9c124ad13] to run with 1 threads
2017-02-09 10:44:53,524 INFO [StandardProcessScheduler Thread-4] o.a.n.c.s.TimerDrivenSchedulingAgent Scheduled ExecuteScript[id=f6d91ea9-100c-115a-6c5c-bd8ae0e515d4] to run with 1 threads
2017-02-09 10:44:55,240 INFO [Flow Service Tasks Thread-1] o.a.nifi.controller.StandardFlowService Saved flow controller org.apache.nifi.controller.FlowController@3429ba07 // Another save pending = false

2017-02-09 10:44:56,509 INFO [NiFi Web Server-18] o.a.n.controller.StandardProcessorNode Stopping processor: class org.apache.nifi.processors.script.ExecuteScript
2017-02-09 10:44:56,520 INFO [StandardProcessScheduler Thread-8] o.a.n.c.s.TimerDrivenSchedulingAgent Stopped scheduling ExecuteScript[id=f6d91ea9-100c-115a-6c5c-bd8ae0e515d4] to run

This same problem also occurs in my amazon ec2 nifi 1.1.1.

I can use a groovy print() to cause output to show in the bootstrap .log file.....

Thanks for a product!