anchor.diff:  === 1st problem : Get Jar
   http://docs.groovy-lang.org/latest/html/documentation/grape.html#_quick_start[Groovy Grab] use http://ant.apache.org/ivy/[Ivy] to manage the recovery of jars.
   You need to add https://wiki.jenkins.io/display/JENKINS/Pipeline+Shared+Groovy+Libraries+Plugin[Shared Groovy Libraries Plugin].
  -By default it get jars from https://search.maven.org/[maven central].
  +By default it get jars from https://search.maven.org/[maven central], but you can specify other repositories with the annotation @GrabResolver
   If you are familiar with this repo, you know that Oracle Driver will not be present. Of course it commercial part etc...
   So the previous code doesn't work and we get this kind of error :
   
  
positive.code: 	at groovy.grape.Grape.grab(Grape.java:167)
  
  So another solution is to register the driver before instantiating the connection, thanks to https://twitter.com/GroGro57[@GroGro57] and https://twitter.com/evildethow[@evildethow] for their help.
  This solution actually works in Jenkins 2.60.1, but I hope @GrabConfig will be added in a future release of the Shared Groovy Plugin.
  
  === Final Code
  
negative.code: ----
  	@Grab('com.oracle:ojdbc6:11.2.0.4')
  	import groovy.sql.Sql;
      import java.util.ServiceLoader;
      import java.sql.Driver;
      
      ServiceLoader<Driver> loader = ServiceLoader.load(Driver.class);
      def sql = Sql.newInstance('jdbc:oracle:thin:@SERVER:2483/INSTANCE', 'USER', 'PASSWORD', 'oracle.jdbc.OracleDriver')
      sql.execute 'select 1 from dual'
      sql.close()
  