[Log4j: Warn please initialize the log4j system properly.] Solution

[Problem description]

Configure the log, use slf4j and log4j together, and use c3p0 in the database connection pool to start the server. The following error occurs:Warning:

 
Log4j: warn no appenders cocould be found for logger (COM. mchange. v2.log. mlog). log4j: Warn please initialize the log4j system properly.
 

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[Cause]

Spring uses the open-source framework log4j to output information.

[Solution]

Add the log4j configuration file. Because Maven is used, you need to create the log4j configuration file log4j In the src/main/Java directory. properties (the Java project is created under the src directory), file content:

Log4j. rootcategory = info, console, rollingfile # log4j.logger.com. neusoft. util. log = debuglog4j. logger. consolebrowse = info, consolelog4j. appender. console = org. apache. log4j. leleappenderlog4j. appender. console. layout = org. apache. log4j. patternlayoutlog4j. appender. console. layout. conversionpattern = % d {yyyy-mm-dd hh: mm: SS, SSS} [% P] [% T] % c {1 }:( % m) % nlog4j. appender. rollingfile = org. apache. log4j. rollingfileappenderlog4j. appender. rollingfile. file = logs/agent. log log4j. appender. rollingfile. maxfilesize = 5mblog4j. appender. rollingfile. layout = org. apache. log4j. patternlayoutlog4j. appender. rollingfile. layout. conversionpattern = % d {yyyy-mm-dd hh: mm: SS, SSS} [%-5 p] [% T] % c {1 }:% M % nlog4j. appender. rollingfile. maxbackupindex = 10log4j. logger. errorlog = error, errorloglog4j. appender. errorlog = org. apache. log4j. rollingfileappenderlog4j. appender. errorlog. file = logs/agenterr. loglog4j. appender. errorlog. maxfilesize = 5mblog4j. appender. errorlog. layout = org. apache. log4j. patternlayoutlog4j. appender. errorlog. layout. conversionpattern = % d {yyyy-mm-dd hh: mm: SS, SSS} [%-5 p] [% T] % c {1 }:% M % nlog4j. appender. errorlog. maxbackupindex = 10

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[Log4j: Warn please initialize the log4j system properly.] Solution