java.util.logging | 易学教程

How to automatically log the entry/exit of methods in Java?

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问题 Right now I am using java.util.logging to log the entry and exit points of each method in my Java project. This is very useful to me when debugging. I have this piece of code at the beginning of each method and a similar one at the end: if (logger.isLoggable(Level.FINER)) { logger.entering(this.getClass().getName(), "methodName"); } Where "methodName" is the the name of the method (hardcoded). So I was wondering if there is a way to do this automatically without having to include this code in

Where does java.util.logging.Logger store their log

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问题 This might be a stupid question but I am a bit lost with java Logger private static Logger logger = Logger.getLogger("order.web.OrderManager"); logger.info("Removed order " + id + "."); Where do I see the log? Also this quote from java.util.logging.Logger library: On each logging call the Logger initially performs a cheap check of the request level (e.g. SEVERE or FINE) against the effective log level of the logger. If the request level is lower than the log level, the logging call returns

How to get java Logger output to file by default [duplicate]

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问题 This question already has an answer here: Where does java.util.logging.Logger store their log 3 answers Netbeans thoughtfully sprinkles Logger.getLogger(this.getClass().getName()).log(Level. [...] statements into catch blocks. Now I would like to point them all to a file (and to console). Every logging tutorial and such only me tells how to get a specific logger to output into a file, but I assume there is a better way than fixing every automatically generated logging statement? Setting a

How to format date in java logging?

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问题 I am using : log.info("Message"); and the output is: Jul 8, 2014 12:58:02 PM myclass main INFO: message How do i just print the message without the date and INFO: ? 回答1: Change the format of the SimpleFormatter using the system property: -Djava.util.logging.SimpleFormatter.format="%2$s: %5$s%6$s%n" or in the logging.properties: java.util.logging.SimpleFormatter.format=%2$s: %5$s%6$s%n All of these properties are documented in the format method. 来源： https://stackoverflow.com/questions/24637600

How to create the log file for each record in a specific format using java util logging framework

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问题 I want to create the log file per request in the format below, using java util logging. YYYYMMDD_HHMMSS.log Anybody please let me know how can I achieve this using java util logging? 回答1: The FileHandler doesn't support generating file names by date and time from the LogManager. If you want to generate a file name on startup you can subclass the FileHandler and create a static method to generate your file name using a SimpleDateFormat. The LogManager supports a 'config' option that will also

Custom java.util.logging Handler in tomcat

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We have some common logging configuration between all of the webapps on a given system that we are trying to externalize to the level of tomcat, rather than trying to handle at the level of the individual webapp. The webapps that are using java.util.logging are proving to be somewhat challenging because we have a custom handler, and there doesn't seem to be an obvious way to get the custom handler to play nicely with tomcat's classloaders. This is all in the prototype stage at the moment. Preliminary: Tomcat 7.0.32, Java 6. Default tomcat 7 install with one REST service deployed and nothing

Logger vs. System.out.println

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问题 I'm using the PMD plugin for eclipse and it gives me an error when using System.out.println() with the explanation: System.(out|err).print is used, consider using a logger. My question is - What is a Logger? How is it used to print to the screen? Why is it better? 回答1: See this short introduction to log4j. The issue is in using System.out to print debugging or diagnostic information. It is a bad practice because you cannot easily change log levels, turn it off, customize it, etc. However if

JUL to SLF4J Bridge

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I'm currently observing that a 3rd party library (namely restfb) is using java.util.logging and I'm seeing those logs end up in STDOUT even though I don't have an SLF4J console appender configured in my logback.xml. I also have the jul-to-slf4j bridge in my classpath. Does the jul-to-slf4j bridge only log to the appenders configured by logback when the bridge is installed or does it also log to stdout? You need to call SLF4JBridgeHandler.install() . You also need to enable all log levels at the root logger (reason in excerpt below) in java.util.logging and remove the default console appender.

How to configure the jdk14 logging's pattern

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问题 I guess I can chnage pattern by adding the line java.util.logging.ConsoleHandler.pattern, however where to check the pattern information like %u %h etc? 回答1: Edit: The below was written at the time for Java 6. For 7 and later, refer to David's answer below. AFAIK there is no such property. There is a java.util.logging.FileHandler.pattern but this is to set the pattern of the output filename , not of the logging format. The way you configure the output format in the util logging API is by

How can I disable the default console handler, while using the java logging API?

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Hi I am trying to implement the java logging in my application. I want to use two handlers. A file handler and my own console handler. Both of my handlers work fine. My logging is send to a file and to the console . My logging is also sent to the default console handler, which i do not want. If you run my code you will see extra two line sent to the console. I don't want to use the default console handler. Does anyone know how to disable the default console handler. I only want to use the two handlers I have created. Handler fh = new FileHandler("test.txt"); fh.setFormatter(formatter); logger