cloudfoundry: use an older buildpack version

问题

Cloundfoundry recently updated its Java buildpack to version 2.5 (including java 8 and tomcat 8). I still would like to use version 2.4 since my app hasn't been upgraded to java 8 yet. What is the easiest way to do so?

I can push the app using

cf push app -b https://github.com/cloudfoundry/java-buildpack

but how can I specify to use release 2.4 (https://github.com/cloudfoundry/java-buildpack/releases/tag/v2.4)? Apparently specifying the tag URL instead doesn't work.

回答1:

To specify a branch with "cf push -b", put a "#" before the branch name. In your example, you would use

$ cf push app -b https://github.com/cloudfoundry/java-buildpack#v2.4

This might give you some strange messages about the buildpack clone being in "detatched HEAD" state, but that can be ignored.

You should be able to run your app on the Java 8 JRE even though it was compiled with an earlier JDK. Are you getting errors when running your app on the Java 8 JRE?

Use directly the version number in the url - without "tags/": java-buildpack#tags/v2.4 -> java-buildpack#v2.4

来源：https://stackoverflow.com/questions/26116320/cloudfoundry-use-an-older-buildpack-version