I have the following code snippet:
public class FooServiceImpl extends RemoteServiceServlet implements
ControllerInputService {
@Override
public String bar(String input) {
...
logger.debug("Entering ... bar()");
...
}
private static final Logger logger = Logger.getLogger
(FooServiceImpl .class.getName());
} // FooServiceImpl
It prints out the following messages:
0 [btpool0-3] DEBUG com.col.server.FooServiceImpl - Entering ... bar()
0 [btpool0-3] DEBUG com.col.server.FooServiceImpl - Entering ... bar()
0 [btpool0-3] DEBUG com.col.server.FooServiceImpl - Entering ... bar()
Notice that it prints out more than 1 time. I double/triple checked
that I only call the bar() method once.
Then, I modified the code as the following:
public class FooServiceImpl extends RemoteServiceServlet implements
ControllerInputService {
@Override
public String bar(String input) {
...
counter++;
logger.debug(counter + " Entering ... bar()");
System.out.println(counter + " Entering ... bar() from
System.out.println()");
...
}
private int counter = 0;
private static final Logger logger = Logger.getLogger
(FooServiceImpl .class.getName());
} // FooServiceImpl
It produces the following output:
0 [btpool0-3] DEBUG com.col.server.FooServiceImpl - 1 Entering ... bar
()
0 [btpool0-3] DEBUG com.col.server.FooServiceImpl - 1 Entering ... bar
()
0 [btpool0-3] DEBUG com.col.server.FooServiceImpl - 1 Entering ... bar
()
1 Entering ... bar() from System.out.println()
Notice that there are still several log outputs (not as expected - I
only expect only 1 output) but only one output from System.out.println
() (as expected) and the counter is still 1 (as expected).
My log4j.properties
# A default log4j configuration for log4j users.
#
# To use this configuration, deploy it into your application's WEB-INF/
classes
# directory. You are also encouraged to edit it as you like.
# Configure the console as our one appender
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d{HH:mm:ss,SSS} %-5p [%c]
- %m%n
My environtments: GAE 1.2.5, GWT 1.7, Eclipse-Galileo on Windows
Vista.
Why do I have several log output?
Thanks in advance for your help.
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