Reputation: 568

Logging with AppEngine doesn't work (neither in-IDE nor deployed)

Using Eclipse 3.6SR2 and the appropriate Google Plugin I create a new Web Application Project. Everything seems already preconfigured to use java.util.logging.Logger but I see no output, neither in the IDE nor after deploying.

private void sendNameToServer() {
    Logger log = Logger.getLogger(TestAppEngine1.class.getName());
    log.setLevel(Level.INFO);
    log.info("info");
    log.severe("severe");
    System.out.println("out");
    System.err.println("err");
    log.log(Level.SEVERE, "severe");

I can only see "out" and "err" in the "Console" window in Eclipe, but not the logs from Logger. After deploying and checking the only logs I see the normal logs e.g. created by long initial load time, but not the Logger logs NOR the "out" or "err".

Things already checked:

appengine-web.xml has <property name="java.util.logging.config.file" value="WEB-INF/logging.properties" />
I also moved logging.properties to the subfolder "classes" and adjusted the settings (saw this as an idea in another question)
logging.properties contains only ".level = ALL"
on the server changed the minimum log level but still no logs ("Error" is the default level, set it to "Debug")
deployed many times
let it sit one day
checked the deployed version online
checked the multiple "Console" windows
googled for hours

I'm really lost. Would be grateful if you could give me a hint.

Upvotes: 2

Answers (4)

lanzalibre

Reputation: 370

The same happened to me because I inserted this right after the Logger declaration

PrintWriter out;

Upvotes: 0

Mark

Reputation: 568

Problem solved:

When using Google App Engine SDK:

java.util.logging.Logger log = java.util.logging.Logger.getLogger("Test");
log.severe("severe");

works fine in the Console and on the Google server.

When using Google Web Toolkit:

java.util.logging.Logger log = java.util.logging.Logger.getLogger("Test");
log.severe("severe");

works in the server part and outputs to the console.
For the client part include

<inherits name="com.google.gwt.logging.Logging"/>

in (modulename).gwt.xml and (using the same logging command) it will output to the console and a small window in the browser.

But no technique works in onModuleLoad(). This seems to be a blind area.

When using GAE+GWT: the same as GWT alone.

Problem why I didn't see anything: trying in onModuleLoad and/or not restarting the hosting server correctly I think.
Thanks to Boris for hinting in the right direction.
Also see GWT logging setup and http://code.google.com/webtoolkit/doc/latest/DevGuideLogging.html

Upvotes: 3