I have installed version 2.13 and, as you told me, the eclipseClasspath task update the JRE_CONTAINER with the jdk version specified by the targetCompatibility variable in the build script.
But it works only with version 1.6, 1.7 and 1.8 of java.
It doesn’t work with 1.4 and 1.5. Because the eclipseClasspath task add an entry in the .classpath named “JavaSE-1.5” and “JavaSE-1.4”.
Those JRE Environments doesn’t exists in my eclipse installation, because Java, up to 1.6 version, was named “J2SE”.
It should add “J2SE-1.5” or “J2SE-1.4”
I hereby attach a screenshot of Eclipse’s Execution Environments
