java - Use of readConfiguration method in logging activities -

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in order use logging in small java desktop application i'm trying understand in depth operation of methods. use stupid , small java program test them.

in particular, when testing behaviour of logmanager.readconfiguration() method i've found strange. in tests logmanager reads configuration properties files located in lib/logging.properties in jre directory. @ time, contents of file follows :

handlers=java.util.logging.consolehandler myapp2.handlers=java.util.logging.consolehandler myapp2.myapp2.handlers=java.util.logging.consolehandler .level=off java.util.logging.consolehandler.level=all java.util.logging.consolehandler.formatter=java.util.logging.simpleformatter java.util.logging.simpleformatter.format=%4$s: %5$s [%1$tc]%n myapp2.level=warning myapp2.myapp2.level=info

the code of java program : 

package myapp2;  import java.io.ioexception; import java.util.logging.logmanager; import java.util.logging.logger;  public class myapp2 {      private static final logger logger = logger.getlogger(myapp2.class.getpackage().getname());     private static final logger logger1 = logger.getlogger(myapp2.class.getname());      /**      * @param args command line arguments      */     public static void main(string[] args) {         logger.severe("severe @ myapp2");         logger.warning("warning @ myapp2");         logger.info("info @ myapp2");         logger1.severe("severe1 @ myapp2");         logger1.warning("warning1 @ myapp2");         logger1.info("info1 @ myapp2");         logger1.setlevel(null);         logger1.setuseparenthandlers(false);         logger1.severe("severe2 @ myapp2");         logger1.warning("warning2 @ myapp2");         logger1.info("info2 @ myapp2");         try {             logmanager.getlogmanager().readconfiguration();         } catch (ioexception ex) {             system.out.println("i/o exception found");         } catch (securityexception ex) {             system.out.println("error securityexception found");         }         logger.severe("severe3 @ myapp2");          logger1.severe("severe4 @ myapp2");     } }

if execute without try-catch surrounding readconfiguration(), works expected , output following :

severe: severe @ myapp2 [dc. maig 08 14:45:38 cest 2013] severe: severe @ myapp2 [dc. maig 08 14:45:38 cest 2013]  warning: warning @ myapp2 [dc. maig 08 14:45:38 cest 2013] warning: warning @ myapp2 [dc. maig 08 14:45:38 cest 2013]  severe: severe1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] severe: severe1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] severe: severe1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] warning: warning1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] warning: warning1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] warning: warning1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] info: info1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] info: info1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] info: info1 @ myapp2 [dc. maig 08 14:45:38 cest 2013] severe: severe2 @ myapp2 [dc. maig 08 14:45:38 cest 2013] warning: warning2 @ myapp2 [dc. maig 08 14:45:38 cest 2013] severe: severe3 @ myapp2 [dc. maig 08 14:45:38 cest 2013] severe: severe3 @ myapp2 [dc. maig 08 14:45:38 cest 2013] severe: severe4 @ myapp2 [dc. maig 08 14:45:38 cest 2013]

but, if execute try-catch, output :

severe: severe @ myapp2 [dc. maig 08 14:46:51 cest 2013] severe: severe @ myapp2 [dc. maig 08 14:46:51 cest 2013] warning: warning @ myapp2 [dc. maig 08 14:46:51 cest 2013] warning: warning @ myapp2 [dc. maig 08 14:46:51 cest 2013] severe: severe1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] severe: severe1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] severe: severe1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] warning: warning1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] warning: warning1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] warning: warning1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] info: info1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] info: info1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] info: info1 @ myapp2 [dc. maig 08 14:46:51 cest 2013] severe: severe2 @ myapp2 [dc. maig 08 14:46:51 cest 2013] warning: warning2 @ myapp2 [dc. maig 08 14:46:51 cest 2013] severe: severe3 @ myapp2 [dc. maig 08 14:46:51 cest 2013]

reading api of readconfiguration() method supposed reinitialize logging properties , reread logging configuration file named previously. if so, why severe3 showing once (i expect displayed 2 times because of 2 loggers present in program , forwarding behaviour) , severe4 missing (i expect displayed once)?. may me undestand this?.

i have encountered many more mistakes readconfiguration method. not expect do. have created small unit test illustrate this:

package com.demo;  import java.io.ioexception; import java.io.inputstream; import java.util.logging.logmanager; import org.junit.test; import org.slf4j.logger; import org.slf4j.loggerfactory;  /**  * @author dhubau  */ public class logtest {      private static final logger logger = loggerfactory.getlogger(logtest.class.getcanonicalname());      @test     public void testlogs() throws ioexception {         logger.trace("before");         logger.debug("before");         logger.info("before");         logger.warn("before");         logger.error("before");          inputstream = logtest.class.getresourceasstream("/logging.properties");          logmanager.getlogmanager().readconfiguration(is);          logger.trace("after");         logger.debug("after");         logger.info("after");         logger.warn("after");         logger.error("after");     } }

when starting unit test, default logging.properties read (defaulting info logging). log every level once , read in own logging.properties file:

# specify handlers create in root logger handlers = java.util.logging.consolehandler  # set default logging level root logger .level = info  # not use root handlers com.demo.useparenthandlers = false  # demo log handlers com.demo.handlers = java.util.logging.consolehandler  # demo log level com.demo.level =  # set default logging level new consolehandler instances java.util.logging.consolehandler.level =

after following output:

may 24, 2013 11:27:29 com.demo.logtest testlogs info: before may 24, 2013 11:27:29 com.demo.logtest testlogs warning: before may 24, 2013 11:27:29 com.demo.logtest testlogs severe: before may 24, 2013 11:27:29 com.demo.logtest testlogs info: after may 24, 2013 11:27:29 com.demo.logtest testlogs warning: after may 24, 2013 11:27:29 com.demo.logtest testlogs severe: after

so see, com.demo package not logging trace or debug levels. when pass following parameter unit test:

java.util.logging.config.file = c:\temp\logging.properties

it gives me following output:

may 24, 2013 11:27:29 com.demo.logtest testlogs finest: before may 24, 2013 11:27:29 com.demo.logtest testlogs fine: before may 24, 2013 11:27:29 com.demo.logtest testlogs info: before may 24, 2013 11:27:29 com.demo.logtest testlogs warning: before may 24, 2013 11:27:29 com.demo.logtest testlogs severe: before may 24, 2013 11:27:29 com.demo.logtest testlogs info: after may 24, 2013 11:27:29 com.demo.logtest testlogs warning: after may 24, 2013 11:27:29 com.demo.logtest testlogs severe: after

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