Kettle-engine.jar and log4j. jar package conflict problem solution, log4j. jar
Java to call kettle, reference the kettle-engine.jar in lib, log4j. jar package, test found that with the kettle-engine.jar package, log can not be written to the log file, but can print to the console; to the Internet to find many friends encountered similar problems, finally, I foun
Log4j logs and log4j logs
First, AOP is required to process logs. it is inconvenient to process logs without using AOP.
Log processing is a very important part of each project. Without logs, the controllability of the system is lost. Without logs, there will be no trace of any problems in the system, which is very dangerous for an information system.
However, when we use the pure OOP idea for log processing
Spring Integration: config log4j in Web. XML Pom.xml =============================================================================================================== ===log4j Basic ConceptsLogger: Log output, provides output log function. Appender: The log destination used to define the log destination object. Several common Appender, the first two are more commonly used: Consoleappend
With log4j, you can easily process logs in your project-control the destination of the Log information output (console, file, GUI component, or NT Event recorder), control the output format of each log (htmllayout layout format, patternlayout layout format, Simplelayout layout format or ttcclayout), controls the level of output log information (debug level, info level, warn level, error level, or fatal level), and so on. Here's a simple example of how
Do the project is log4j output formatting parameters get bored, simply the relevant part of the API is roughly translated, the original see http://logging.apache.org/log4j/docs/api/org/apache/log4j/PatternLayout.html
Parameters
Description
Example
% C
Lists the full name of a logger namespace. If {
Example of parameters in the
Log4j is used in spring, but because the project needs to use the Task Scheduler, so add quartz, but quartz need sfl4j-log4j and SFL4J-API
However, if you use sfl4j-log4j and log4j, there will be conflicts ... Error occurs at startup
Then you need to convert the version of quartz ...
Project original Lib Quartz is 1
steps:
Create a new Java project and import the log4j jar package;
Create the Log4j.properties profile and set it in the SRC directory;1 # Set the global output level2Log4j.rootlogger=Error,stdout,file3 4 # Output logs above the error level to the console5log4j.appender.stdout=Org.apache.log4j.ConsoleAppender6log4j.appender.stdout.target=System.out7log4j.appender.stdout.layout=Org.apache.log4j.PatternLayout8Log4j.appender.stdout.layout.conversio
The project uses log4j print content to transfer to flume1, Flume endThe agent configuration for Flume is as follows:
12345678910111213141516
a1.sources=s1a1.sinks=k1a1.channels=c1a1.sources.s1.channels=c1a1.sinks.k1.channel=c1a1.sources.s1.type=avroa1.sources.s1.bind=vm1a1.sources.s1.port=41414 a1.sinks.k1.type=loggera1.channels.c1.type=memorya1.channels.c1.capacity=1000a1.channels.c1.transactionCapacity=100
Start the
Log4j defines the Log Level and log4j Log Level of a class.
After a scheduled task is introduced into the project, when I delete an existing scheduled task
[Org. springframework. scheduling. quartz. localperformancejobstore] ClusterManager: detected 1 failed or restarted instances.[Org. springframework. scheduling. quartz. localperformancejobstore] ClusterManager: Scanning for instance "***"'s failed in
When using Maven to build a hadoop application:
Missing artifact log4j: log4j: jar: 1.2.15: Compile
In Pom. XML, the configuration is
The reason is that log4j has changed the protocol in version 1.2.15 and later, which is in conflict with JMS. There are two solutions: Version 1.2.14 and JMS. jar are manually downloaded and installed in the maven local reposi
Link: http://blog.csdn.net/guoquanyou/article/details/5689652
Do the project is log4j output format parameters annoying, simply put the relevant parts of the API roughly translated, the original see http://logging.apache.org/log4j/docs/api/org/apache/log4j/PatternLayout.html
Parameters
Description
Example
%c
Lists the full name
log4j Configuration Sample
#定义根日志级别和输出端 (two outputs defined) Log4j.rootlogger=error,console,orclight #定义第一个输出端, output to console log4j.appender.console=
Org.apache.log4j.ConsoleAppender Log4j.appender.console.layout=org.apache.log4j.patternlayout log4j.appender.console.layout.conversionpattern=%d [%t]%-5p%c (%l)-%m%n #定时第二个输出端, output to a file with a maximum space of 1000KB, Automatically back up after 1000KB, generate new files Log4j.appender.or
The following is written in the official log4j API, which is sufficient to explain the difference between logger and category...
public class Category
Extends java. Lang. Object
Implements appenderattachable
This class has been deprecated andReplaced byLogger Subclass. ItWill be kept around to preserve backward compatibility until mid2003.
LoggerIs a subclass of category, I. e. It extendsCategory. In other words, a loggerIsA c
Do the project is log4j output format parameters annoying, simply put the relevant parts of the API roughly translated, the original see http://logging.apache.org/log4j/docs/api/org/apache/log4j/PatternLayout.htmlParameter Description Example%c lists the full name of the logger namespace, and if the addition of the {Suppose the current logger namespace is "A.B.C"
Log4j configuration file is used to set the recorder level, storage device, and layout. It can be connected to key = value format settings or XML format settings. Through configuration, you can create a log4j runtime environment.
1. Configuration FileThe basic format of the log4j configuration file is as follows:# Configure the root Logger
Received a demand, through the log4j time print log, requirements described as follows: the need to be able to print the log regularly, the interval can be matched. When it comes to timing, first think of the Dailyrollingfileappender class, various timing, according to Datepattern, this can refer to class SimpleDateFormat class, common some of the regular settings are as follows:
[HTML]View Plain copy print? '.' YYYY-MM: Monthly '. ' YYYY-WW: Weekly '
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