Core added a check recently (1.597 or so) to ensure existing build numbers don't get reused. That surfaced a few bugs. The most common of these is when using an older version of Git plugin, have a matrix job, and trigger builds from post-commit hooks. This doesn't look like that would though AFAICT -- if you're on up to date Jenkins and plugins and it still occurs, consider filing a bug. Read all of
https://wiki.jenkins-ci.org/display/JENKINS/How+to+report+an+issue beforehand, this is one of these issues where we'll need a lot of information to investigate.
> On 03.09.2015, at 08:47, Peter Berghold <
salty....@gmail.com> wrote:
>
> Why does this happen?
>
> java.lang.IllegalStateException: /usr/share/tomcat6/webapps/jenkins/jobs/DEV-dnsstat/builds/2 already existed; will not overwite with DEV-dnsstat #2
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