.travis/toolchains.xml

<?xml version="1.0" encoding="UTF8"?>
<toolchains xmlns="http://maven.apache.org/TOOLCHAINS/1.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/TOOLCHAINS/1.1.0 http://maven.apache.org/xsd/toolchains-1.1.0.xsd">

  <toolchain>
    <type>jdk</type>
    <provides>
      <id>java15</id>
      <version>5</version>
      <vendor>sun</vendor>
    </provides>
    <configuration>
      <jdkHome>/tmp/jdk/5</jdkHome>
    </configuration>
  </toolchain>

</toolchains>