Inspired by Leif's Hypoport post, this is how I "bent" Hibernate 4 back to slf4j:
Let's assume you are using Maven.
- Add
org.slf4j:log4j-over-slf4j as a dependency to your pom.xml
- Using the command
mvn dependency:tree, make sure none of the artifacts you're using depende on slf4j:slf4j (to be precise, no artifact shall have a compile scope dependency or runtime scope dependency on slf4j:slf4j)
Background: Hibernate 4.x has a dependency on the artifact org.jboss.logging:jboss-logging. Transitively, this artifact has a provided scope dependency on the artifact slf4j:slf4j.
As we now have added the org.slf4j:log4j-over-slf4j artifact, org.slf4j:log4j-over-slf4j mimicks the slf4j:slf4j artifact. Therefore everything that JBoss Logging logs will now actually go via slf4j.
Let's say you're using Logback as your logging backend. Here is a sample pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
....
<properties>
....
<slf4j-api-version>1.7.2</slf4j-api-version>
<log4j-over-slf4j-version>1.7.2</log4j-over-slf4j-version>
<jcl-over-slf4j-version>1.7.2</jcl-over-slf4j-version> <!-- no problem to have yet another slf4j bridge -->
<logback-core-version>1.0.7</logback-core-version>
<logback-classic-version>1.0.7</logback-classic-version>
<hibernate-entitymanager-version>4.1.7.Final</hibernate-entitymanager-version> <!-- our logging problem child -->
</properties>
<dependencies>
<!-- begin: logging-related artifacts .... -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j-api-version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${jcl-over-slf4j-version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>${log4j-over-slf4j-version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback-core-version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback-classic-version}</version>
</dependency>
<!-- end: logging-related artifacts .... -->
<!-- begin: some artifact with direct dependency on log4j:log4j .... -->
<dependency>
<groupId>org.foo</groupId>
<artifactId>some-artifact-with-compile-or-runtime-scope-dependency-on-log4j:log4j</artifactId>
<version>${bla}</version>
<exclusions>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- begin: some artifact with direct dependency on log4j:log4j .... -->
<!-- begin: a hibernate 4.x problem child........... -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate-entitymanager-version}</version>
</dependencies>
<!-- end: a hibernate 4.x problem child........... -->
....
</project>
On your classpath, have a logback.xml, such as this one located in src/main/java:
<!-- begin: logback.xml -->
<configuration>
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<logger name="org.hibernate" level="debug"/>
<root level="info">
<appender-ref ref="console"/>
</root>
</configuration>
<!-- end: logback.xml -->
Some components may want to have access to logback.xml at JVM start-up time for proper logging, for instance the Jetty Maven Plugin. In that case, add a Java system logback.configurationFile=./path/to/logback.xml to your command (e.g. mvn -Dlogback.configurationFile=./target/classes/logback.xml jetty:run).
In case you are still getting "raw" console stdout Hibernate output (like Hibernate: select ...), then Stack Overflow question " Turn off hibernate logging to console " may apply.
