I am trying to upgrade log4j to log4j2.I am using some methods of log4j1 like removeAllappender(),setName(), these not found in log4j2.
I have included these dependencies:-
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.14.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.14.1</version>
</dependency>
I tried to include bridge also but it fails the build. How can I solve these?
note:-My project is in maven.
**i have also added bridge dependency 1.x to 2.x
Related
Trying to update log4j2 for legacy spring boot application (using Spring-boot-parent-1.5.6.RELEASE) - using multi module
Tried all the ways spring suggested in recent docs but none of them worked.
Options tried:
option 1 - Adding to properties
<properties>
<log4j2.version>2.17.0</log4j2.version>
</properties>
option 2 - adding starter-log4j2 and excluding core, later adding log4j core (latest)
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-log4j2</artifactid>
<version>2.6.1</version>
<exclusions>
<exclusion>
<groupid>org.apache.logging.log4j</groupid>
<artifactid>log4j-core</artifactid>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupid>org.apache.logging.log4j</groupid>
<artifactid>log4j-core</artifactid>
<version>2.15.0</version>
</dependency>
option 3 - just the above one along with log4j2 api
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-log4j2</artifactid>
<exclusions>
<exclusion>
<groupid>org.apache.logging.log4j</groupid>
<artifactid>log4j-core</artifactid>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupid>org.apache.logging.log4j</groupid>
<artifactid>log4j-api</artifactid>
<version>2.16.0</version>
</dependency>
<dependency>
<groupid>org.apache.logging.log4j</groupid>
<artifactid>log4j-core</artifactid>
<version>2.16.0</version>
</dependency>
But still the dependencies imported were slf4j-over-log4j(1.7.25), log4j(2.7, 2.11.1). Is there something else i could do.
Option 1 should work.
Build your project using mvn clean install
Check the contents of your jar file: go to your_project/target directory and run jar tf your-project.jarcommand. There should be only log4j-core-2.17.0.jar and no other versions of log4j-core
Edit: also update log4j-core version in your child modules
The import statements aren't working
I am new to Maven so I'm not sure what to do (if I'm missing a dependancy or something)
Add this in the dependency section of your pom :
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
There are other logging libraries available ,refer :
https://www.baeldung.com/java-logging-intro
If you are using Spring, I'm not sure if need to add it. When I add the line
Log log = LogFactory.getLog(MYCLASS.class);
to a class & I choose "Import class" in IntelliJ, I can see that it refers to org.springframework:spring-jcl:5.0.5.RELEASE, so it seems to already be available through the Spring.jar .
If you want to try adding it you can add the following to your dependencies list in the pom:
<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
I would also point you to Log4j which is very popular & efficient. If you want to use that you need to do two things:
Add the dependencies to the pom:
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.3</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.3</version>
</dependency>
Add a log4j.properties or log4j.xml file with configurations to the classpath (mine is in sr/main/resources).
In my project I have slf4j-log4j12
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
<scope>test</scope>
</dependency>
This version uses log4j 1.2.17. The log4j latest update is 2.11.1.
How can I make my maven project to force use the latest log4j i.e. 2.11.1 version?
Be aware that log4j version 2 is completely incompatible with log4j version 1. You cannot replace like that those version.
To use log4j-2 as backend for slf4j, you will need to replace this dependency by another.
From the page in log4j 2 site, the dependency is linked to the version of slf4j
In your use case, (sf4j 1.7) it is this one:
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.11.1</version>
<scope>test</scope>
</dependency>
for slf4j 1.8+ it will be this one:
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j18-impl</artifactId>
<version>2.11.1</version>
<scope>test</scope>
</dependency>
I'm using Spring Boot 1.3.2, with Logback, and using EhCache as the Hibernate second-level cache with JGroups 3.6.8.Final for distribution. All of the log messages for org.jgroups loggers are coming out as unknown.jul.logger. This originates in the SLF4JBridgeHandler that Spring Boot installs to bridge java.util.logging loggers over to SLF4J.
Is there something I can do to have the logger name propagated over to the SLF4J logger? When I was using JGroups 3.1.0.Final it was working fine, but after the upgrade all I get is the unknown logger.
Since jgroups 3.6.x I switched to the following configuration (slf4j + log4j2).
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.6</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.5</version>
</dependency>
I wanted to experiment with using the YAML configuration file with log4j2, but log4j2 cannot load the configuration because the YamlConfigurationFactory cannot find its dependencies from the classpath.
The relevant section of my pom.xml:
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.1</version>
</dependency>
</dependencies>
After that didn't work, I tried adding the <dependencyManagement> section to the pom:
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-bom</artifactId>
<version>2.1</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
but that didn't help either. Anyone know what's wrong?
Also, if someone can point me to an example of YAML log4j2 config, that would be very much appreciated. (I just thought I would do a "quick" experiment with this, and of course, it became a time sink...)
Including the jackson-dataformat-yaml dependency is not enough. You also need to include jackson-core and jackson-databind.
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.4.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.4.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
<version>2.4.2</version>
</dependency>
You can see these dependencies are hardcoded in the YAML configuration factory implementation (org.apache.logging.log4j.core.config.yaml.YamlConfigurationFactory)
private static final String[] dependencies = new String[] {
"com.fasterxml.jackson.databind.ObjectMapper",
"com.fasterxml.jackson.databind.JsonNode",
"com.fasterxml.jackson.core.JsonParser",
"com.fasterxml.jackson.dataformat.yaml.YAMLFactory"
};
I'm not really a maven user, but I think the issue here is that the YAML support is an optional feature, so it doesn't get pulled in automatically by specifying the log4j dependency. The Log4j Runtime Dependencies page lists the Jackson YAML data format as the (only) dependency required for YAML configuration support. Quoting the maven dependency snippet from there:
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
<version>2.4.0</version>
</dependency>