org apache log4j rollingfileappender

1. If you runProgramError:"Exception in thread "Main" Java. Lang. noclassdeffounderror: ORG/slf4j/loggerfactory", This is because the project lacks both the slf4j-api.jar and slf4j-log4j12.jar jar packages. 2. If an error occurs in the running program:"Java. Lang. noclassdeffounderror: ORG/Apache/log4j/logmanager", T

Output logs to the console Org. Apache. log4j. fileappender Output logs to files Org. Apache. log4j. dailyrollingfileappender Generates a log file every day.

On debian4, install java5: sudo aptitude install sun-java5-jdk with Aptitude The version information running in java-version is similar to: --------------------------------------- java version "1.5.0 _ 17" Java (TM) 2 Runtime Environment, Standard Edition (build 1.5.0 _ 17-b04) Java HotSpot (TM) client VM (build 1.5.0 _ 17-b04, mixed mode, sharing) ------------------------------------------ the last sharing is very strange. If this information is not found in the installed version, aptitude inst

-nio-8080"] 31-Jan-2018 17:26:33. 590 information [main] org. apache. coyote. abstractProtocol. pause Pausing ProtocolHandler ["ajp-nio-8009"] 31-Jan-2018 17:26:33. 939 information [main] org. apache. catalina. core. standardService. stopInternal Stopping service [Catalina] 23907 INFO [17:26:33] Closing WebApplicationC

Seehttp://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.Exception in thread "main" java.lang.NullPointerException atjava.lang.ProcessBuilder.start(Unknown Source) atorg.apache.hadoop.util.Shell.runCommand(Shell.java:482) atorg.apache.hadoop.util.Shell.run(Shell.java:455) atorg.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:715) atorg.apache.hadoop.util.Shell.execCommand(Shell.java:808)

Apache's common logging is a high-level log framework that does not implement real log writing capabilities, but relies on other log systems such as log4j or Java. util. logging. You can use the configuration file to set whether to use log4j or Java. util. logging. Java. utl. Logging is used by default. If you want to use log4j, You need to configure it in three