roles/ubuntu-slaves/files/toolchains.xml

<?xml version="1.0" encoding="UTF8"?>
<toolchains>
  <!-- JDK toolchains -->
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.5</version>
      <vendor>oracle</vendor>
    </provides>
    <configuration>
      <jdkHome>/home/jenkins/tools/java/latest1.5/</jdkHome>
    </configuration>
  </toolchain>
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.6</version>
      <vendor>oracle</vendor>
    </provides>
    <configuration>
      <jdkHome>/home/jenkins/tools/java/latest1.6/</jdkHome>
    </configuration>
  </toolchain>
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.7</version>
      <vendor>oracle</vendor>
    </provides>
    <configuration>
      <jdkHome>/home/jenkins/tools/java/latest1.7/</jdkHome>
    </configuration>
  </toolchain>
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.8</version>
      <vendor>oracle</vendor>
    </provides>
    <configuration>
      <jdkHome>/home/jenkins/tools/java/latest1.8/</jdkHome>
    </configuration>
  </toolchain>
</toolchains>