log4j2

问题 I want to use slf4j over log4j. I added the following dependencies in my pom.xml (I used 1.7.25 for slf4j and 2.10.0 for log4j2): <dependencies> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-slf4j-impl</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j

问题 I want to use slf4j over log4j. I added the following dependencies in my pom.xml (I used 1.7.25 for slf4j and 2.10.0 for log4j2): <dependencies> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-slf4j-impl</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j

问题 Please find below my log4.xml configuration for rolling file appender <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'> <appender name="instrumentationAppender" class="org.apache.log4j.RollingFileAppender"> <param name="file" value="C:\\Users\\Test\\Downloads\\Testlogs\\instrumentation.log"/> <param name="Append" value="true" /> <param name="Encoding" value="UTF-8" /> <param name=

问题 Please find below my log4.xml configuration for rolling file appender <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'> <appender name="instrumentationAppender" class="org.apache.log4j.RollingFileAppender"> <param name="file" value="C:\\Users\\Test\\Downloads\\Testlogs\\instrumentation.log"/> <param name="Append" value="true" /> <param name="Encoding" value="UTF-8" /> <param name=

问题 I recently switched to Apache log4j2, and still can not find a way to configure hibernate logging using log4j2.xml. Because I can not find a way around this problem I still use log4j.properties file explicitly for hibernate. This is not the best solution since my log4j2.xml uses JPA appender (writes logs to db). I do not want to write separate logic for hibernate. Is there a way to configure hibernate logging using log4j2? 回答1: As suggested in https://issues.apache.org/jira/browse/LOG4J2-172

问题 I recently switched to Apache log4j2, and still can not find a way to configure hibernate logging using log4j2.xml. Because I can not find a way around this problem I still use log4j.properties file explicitly for hibernate. This is not the best solution since my log4j2.xml uses JPA appender (writes logs to db). I do not want to write separate logic for hibernate. Is there a way to configure hibernate logging using log4j2? 回答1: As suggested in https://issues.apache.org/jira/browse/LOG4J2-172

问题 I recently switched to Apache log4j2, and still can not find a way to configure hibernate logging using log4j2.xml. Because I can not find a way around this problem I still use log4j.properties file explicitly for hibernate. This is not the best solution since my log4j2.xml uses JPA appender (writes logs to db). I do not want to write separate logic for hibernate. Is there a way to configure hibernate logging using log4j2? 回答1: As suggested in https://issues.apache.org/jira/browse/LOG4J2-172

问题 I recently switched to Apache log4j2, and still can not find a way to configure hibernate logging using log4j2.xml. Because I can not find a way around this problem I still use log4j.properties file explicitly for hibernate. This is not the best solution since my log4j2.xml uses JPA appender (writes logs to db). I do not want to write separate logic for hibernate. Is there a way to configure hibernate logging using log4j2? 回答1: As suggested in https://issues.apache.org/jira/browse/LOG4J2-172

问题 As far as i understand log4j can handle system property -Dlog4j.debug. If you run your app with it you will get log4j's debug output. Example: java -Dlog4j.debug -jar test.jar Is there something similar for log4j 2? 回答1: Update January 2018: From Log4j 2.10, this is easy: just run your program with system property log4j2.debug (no value needed; an empty string is fine). The current (log4j-2.1) documentation on the status logger is a bit confusing. Basically: Until a configuration is found,

问题 For asynchronous logging, what happens to the logs that are not yet written to the destination appender and the application/system goes down? Do we loose these logs (since they are in memory) or is there a way to recover them? I don't want to loose any ERROR level logging. So my next question is: Is there a way to configure sync and async logging for a single appender at log level? For e.g. I want my file appender to perform ERROR level logging synchronously while INFO/DEBUG asynchronously?