Hibernate 3.4 with slf4j and log4j

Question

I\'m attempting to upgrade from Hibernate 3.2 to 3.4, which apparently uses slf4j. Our project currently uses log4j. So my assumption is that I should be using the slf4j-log

Answer 1

A Google search found this:

http://marc.info/?l=slf4j-user&m=122218775201271&w=2

Maybe you should check your JAR versions to make sure they're compatible.

Answer 2

I had the same problem with displaytag version 1.2 including old slf4j. Changing the displaytag to have the exclusion:

<dependency>
  <groupId>displaytag</groupId>
  <artifactId>displaytag</artifactId>
  <version>1.2</version>
  <exclusions>
    <exclusion>
      <groupId>org.slf4j</groupId>
      <artifactId>jcl104-over-slf4j</artifactId>
    </exclusion>
  </exclusions>
</dependency>

and adding the correct dependencies:

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.5.6</version>
</dependency>
<!-- concrete Log4J Implementation for SLF4J API-->
<dependency>
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-log4j12</artifactId>
   <version>1.5.6</version>
</dependency>

seemed to fix the problem.

Answer 3

This question is answered by the SLF4J FAQ. Please see

http://slf4j.org/faq.html#compatibility and http://slf4j.org/faq.html#IllegalAccessError

Answer 4

I think you need to exclude the built-in SLF4J dependency from each of the Hibernate dependencies.

I use Hibernate with JPA, so my config isn't identical, but I think the crucial thing is to explicitly include log4j and SLF4J and explicitly exclude slf4j-api from all org.hibernate dependencies:

    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.15</version>
        <scope>compile</scope>
        <exclusions>
            <exclusion>
                <groupId>com.sun.jmx</groupId>
                <artifactId>jmxri</artifactId>
            </exclusion>
            <exclusion>
                <groupId>javax.jms</groupId>
                <artifactId>jms</artifactId>
            </exclusion>
            <exclusion>
                <groupId>com.sun.jdmk</groupId>
                <artifactId>jmxtools</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-annotations</artifactId>
        <version>3.4.0.GA</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
            </exclusion>
        </exclusions>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>3.4.0.GA</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
            </exclusion>
        </exclusions>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.5.6</version>
        <scope>runtime</scope>
    </dependency>

Answer 5

i have no problems with

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.3.1.GA</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-annotations</artifactId>
        <version>3.4.0.GA</version>
    </dependency>

and

     <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.5.6</version>
    </dependency>
    <!-- concrete Log4J Implementation for SLF4J API-->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.5.6</version>
    </dependency>

Answer 6

After checking the version 1.5.6 POM for slf4j-log4j (and then slf4j-parent) you should be using log4j-1.2.14. The slf4j-log4j POM uses dependency management to inherit the appropriate version of log4j from the slf4j-parent POM.

You shouldn't, however, need to include log4j as a specific dependency as it is already a dependency of slf4j-log4j. That may have been where you caused your problem.