Google App Engine - Can not find my logging messages

28
votes

I can not find the results of my logging calls. To log messages I tried both: 

System.out.println("some message");

and 

Logger logger = Logger.getLogger("MyLogger"); // Logger is java.util.logging.Logger 

// ... 

logger.info("some message");

I have deployed my app and after few tests I decided check out some log messages. But there were no messages. I changed minimum severity level to "Info" from default "Error", and only messages i've seen were service messages like this:

http://dl.dropbox.com/u/1678938/logs.png

I would also be grateful if someone show a little snippet with logging some data (if it's works) - I suspect my problem may be the one of that stupid problems when somewhat incorrectly located comma can be the cause of situation.

4
javagoogle-app-enginelogging
Did you click the + signs next to those log messages to expand them? As displayed, it's impossible to tell if things you logged are actually in the log. - Wooble
yes, i clicked +'es - there're was nothing similar with the info, i logged in my app. Only "dummy" strings describing some requests to the app - Alexander
Are you looking at the logs for the correct version of your app? It is possible that you deployed to version X but are looking at the logs for version Y. - David Underhill
before posting my problem here i had only one version. Now i'm trying out different versions, changing logging techiques, but with no results yet - Alexander
I also have this problem. I am unable to see my logging messages. Even exceptions. Stuck with it. - Tahir Akram

4 Answers

27
votes

Could it be that your logging.properties is setting the default value to WARNING?

Ours has this in our war/WEB-INF/logging.properties file:

# Set the default logging level for all loggers to WARNING
.level = WARNING

# Default level for subpackages of 'server' will be INFO
com.company.whatever.server.level=INFO
12
votes

Problem has shrunk into more concrete form - App Engine "eats" info-messages, but shows others, such as error and warning messages.

After this call I have eventually seen my info messages: 

log.setLevel(Level.INFO);

But it is still not clearly - why info-messages weren't being shown. Google's manual states:

Everything the servlet writes to the standard output stream (System.out) and standard error stream (System.err) is captured by App Engine and recorded in the application logs. Lines written to the standard output stream are logged at the "INFO" level, and lines written to the standard error stream are logged at the "WARNING" level.

8
votes

Had exactly the same problem and after changing the value in logging.properties from

.level = WARNING

to

.level = INFO

The problem was definitively fixed. Google needs to update their documentation and/or change the value of the supplied default so that "INFO" log messages don't get swallowed.

0
votes

I used to set LEVEL to SEVERE for testing 

 logger.log(Level.SEVERE, "test message");

It does not need changing any value in logging.properties