title: Maven + SLF4J: Version conflict when using two different dependencies that require two different SLF4J versions
body: <p>I have a project that use both dependencies independently: BoneCP and Hibernate. But thanks to SLF4J and its version conflicts it does not work because BoneCP requires SLF4J 1.5 and Hibernate requires SLF4j 1.6. As you know it is not possible to important two different versions of the same dependency in your pom.xml. So what can I do to workaround this amazing SLF4J side-effect???</p>
  
  <p>The error I get is the infamous: </p>
  
  <pre><code>SLF4J: The requested version 1.5.10 by your slf4j binding is not compatible with [1.6]
  SLF4J: See http://www.slf4j.org/codes.html#version_mismatch for further details.
  </code></pre>
  
  <p>I would need to add this, but same dependency with two different versions is not allowed:</p>
  
  <pre><code>&lt;dependency&gt;
  &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
  &lt;artifactId&gt;slf4j-log4j12&lt;/artifactId&gt;
  &lt;version&gt;1.5.10&lt;/version&gt;
  &lt;scope&gt;provided&lt;/scope&gt;
  &lt;/dependency&gt;   
  
  &lt;dependency&gt;
  &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
  &lt;artifactId&gt;slf4j-log4j12&lt;/artifactId&gt;
  &lt;version&gt;1.6.2&lt;/version&gt;
  &lt;scope&gt;provided&lt;/scope&gt;
  &lt;/dependency&gt;   
  </code></pre>
  
  <p>Maven dependency tree:</p>
  
  <pre><code>[INFO] [dependency:tree {execution: default-cli}]
  [INFO] org.mentawai:menta:war:1.0.5-SNAPSHOT
  [INFO] +- javax.servlet.jsp:jsp-api:jar:2.0:provided
  [INFO] +- javax.servlet:servlet-api:jar:2.5:provided
  [INFO] +- javax.activation:activation:jar:1.1:compile
  [INFO] +- javax.mail:mail:jar:1.4:compile
  [INFO] +- javax.persistence:persistence-api:jar:1.0:compile
  [INFO] +- org.slf4j:slf4j-log4j12:jar:1.5.10:compile
  [INFO] |  +- org.slf4j:slf4j-api:jar:1.5.10:compile
  [INFO] |  \- log4j:log4j:jar:1.2.14:compile
  [INFO] +- org.hibernate:hibernate-core:jar:3.6.7.Final:compile
  [INFO] |  +- antlr:antlr:jar:2.7.6:compile
  [INFO] |  +- commons-collections:commons-collections:jar:3.1:compile
  [INFO] |  +- dom4j:dom4j:jar:1.6.1:compile
  [INFO] |  +- org.hibernate:hibernate-commons-annotations:jar:3.2.0.Final:compile
  [INFO] |  +- org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.1.Final:compile
  [INFO] |  \- javax.transaction:jta:jar:1.1:compile
  [INFO] +- javassist:javassist:jar:3.12.1.GA:compile
  [INFO] +- junit:junit:jar:4.8.1:test
  [INFO] +- c3p0:c3p0:jar:0.9.1.2:compile
  [INFO] +- com.h2database:h2:jar:1.2.138:compile
  [INFO] +- mysql:mysql-connector-java:jar:5.1.13:compile
  [INFO] +- me.soliveirajr:mentawai:jar:2.3.3-SNAPSHOT:compile
  [INFO] |  +- net.sf.json-lib:json-lib:jar:jdk15:2.3:compile
  [INFO] |  |  +- commons-beanutils:commons-beanutils:jar:1.8.0:compile
  [INFO] |  |  +- commons-logging:commons-logging:jar:1.1.1:compile
  [INFO] |  |  \- net.sf.ezmorph:ezmorph:jar:1.0.6:compile
  [INFO] |  +- org.jdom:jdom:jar:1.1:compile
  [INFO] |  +- com.thoughtworks.xstream:xstream:jar:1.3.1:compile
  [INFO] |  |  \- xpp3:xpp3_min:jar:1.1.4c:compile
  [INFO] |  +- org.ajaxtags:ajaxtags:jar:1.2-beta3:compile
  [INFO] |  |  +- javax.servlet:jstl:jar:1.0.6:compile
  [INFO] |  |  +- taglibs:standard:jar:1.0.6:compile
  [INFO] |  |  \- net.htmlparser:jericho-html:jar:2.1:compile
  [INFO] |  +- jgroups:jgroups-all:jar:2.2.9.1:compile
  [INFO] |  +- me.soliveirajr:menta-container:jar:0.9.8:compile
  [INFO] |  +- me.soliveirajr:menta-bean:jar:1.1.1:compile
  [INFO] |  +- me.soliveirajr:menta-regex:jar:0.9.5:compile
  [INFO] |  +- org.beanshell:bsh:jar:2.0b4:compile
  [INFO] |  +- com.jolbox:bonecp:jar:0.7.1.RELEASE:compile
  [INFO] |  |  \- com.google.guava:guava:jar:r08:compile
  [INFO] |  +- velocity:velocity-dep:jar:1.4:compile
  [INFO] |  +- commons-fileupload:commons-fileupload:jar:1.2.2:compile
  [INFO] |  +- commons-io:commons-io:jar:1.3.2:compile
  [INFO] |  +- net.tanesha.recaptcha4j:recaptcha4j:jar:0.0.7:compile
  [INFO] |  \- commons-dbcp:commons-dbcp:jar:1.4:compile
  [INFO] |     \- commons-pool:commons-pool:jar:1.5.4:compile
  [INFO] +- commons-lang:commons-lang:jar:2.5:compile
  [INFO] \- asm:asm:jar:3.2:compile
  </code></pre>