title: liquibase 3.4.1 and doesn't work with Java 7
body: <p>I'm trying to switch from liquibase depedencies from 3.0.2 to 3.4.1 in a Java based tool but when running with Java 7 (tried different updates including latest 80) i'm getting strange exceptions like:</p>
  
  <blockquote>
    <p>2015-11-13T11:55:43,351+02:00 ERROR  java.lang.IllegalStateException: Cannot find generators for database class liquibase.database.core.MSSQLDatabase, statement: liquibase.statement.core.UpdateStatement@5232d51 - [pool-3-thread-1]
    liquibase.exception.LockException: java.lang.IllegalStateException: Cannot find generators for database class liquibase.database.core.MSSQLDatabase, statement: liquibase.statement.core.UpdateStatement@5232d51</p>
  </blockquote>
  
  <p>or</p>
  
  <blockquote>
    <p>iquibase.exception.UnexpectedLiquibaseException: liquibase.exception.ServiceNotFoundException: liquibase.exception.ServiceNotFoundException: Could not find unique implementation of liquibase.executor.Executor.  Found 0 implementations
        at liquibase.executor.ExecutorService.getExecutor(ExecutorService.java:31) ~[liquibase-core-3.4.1.jar:na]</p>
  </blockquote>
  
  <p>With Java 8 everything works fine.</p>
  
  <p>Is this a known issue? Is there any documentation stating 3.4.1 works only with Java 8 (couldn't find anything).</p>
  
  <p>Thanks,
  Dan</p>