I created an new job with only this plugins and it still doesn't trigger:

Building on master in workspace /var/lib/jenkins/jobs/dummy/workspace
Run condition [Always] enabling prebuild for step [Build other projects]
Run condition [Always] enabling perform for step [Build other projects]
Finished: SUCCESS

Also Jenkins log shows no error.

It reproduces in my environment.

Please use Parameterized Trigger Plugin instead for now.

1. Install Parameterized Trigger Plugin from update center.
2. Replace "Build other projects" in Flexible Publish with "Trigger parameterized build on other projects".
3. Check "Trigger build without parameters"

(Changed the priority to Major as there's a workaround)

It worked on Jenkins 1.480.3.
Something should have been changed in Jenkins core between 1.480.3 and 1.509.2.

So bad.
The name of interface "DependecyDeclarer" has been changed in 1.509.1.
https://github.com/jenkinsci/jenkins/commit/e451687beb547a64664803ce44a0bbf1938251ca

1.509.1 1.501

I need upgrade the target Jenkins version to fix this, but it doesn't feel reasonable to break compatibility only for that...

This would work both for Jenkins < 1.501 and >= 1.501.
http://javadoc.jenkins-ci.org/hudson/util/DescribableList.html#buildDependencyGraph(hudson.model.AbstractProject,%20hudson.model.DependencyGraph)

Thanks for taking a look.

I cannot use "Parameterized Trigger" from within a Flexible block (I see no such option). Using just Parameterized Trigger works, but it's unconditional.

"Trigger parameterized build on other projects" appears in "Action" of "Flexible publish" in my environment, Jenkins 1.583 + Flexible Publish 0.12 + Parameterized Trigger 2.25.

If it doesn't appear even if you restart your Jenkins, please create another issue and report details.

https://github.com/jenkinsci/flexible-publish-plugin/pull/4

I confirm the workaround (using Parameterized Trigger together with Flexible Trigger) to be working.

Code changed in jenkins
User: ikedam
Path:
src/main/java/org/jenkins_ci/plugins/flexible_publish/ConditionalPublisher.java
http://jenkins-ci.org/commit/flexible-publish-plugin/cbb69ce22f41f251f3d300508e354867ea49e802
Log:
[FIXED JENKINS-25017] Also work for Depende*n*cyDeclarer introduced in Jenkins 1.501.

Code changed in jenkins
User: ikedam
Path:
src/main/java/org/jenkins_ci/plugins/flexible_publish/ConditionalPublisher.java
http://jenkins-ci.org/commit/flexible-publish-plugin/6b9f980f351ecdfddf0a92b7486f482f84040090
Log:
Merge pull request #4 from ikedam/feature/JENKINS-25017_DpendencyDeclarer

JENKINS-25017 Also work for Depende*n*cyDeclarer introduced in Jenkins 1.501.

Compare: https://github.com/jenkinsci/flexible-publish-plugin/compare/7c0d2dfc1cb9...6b9f980f351e

Let me have a few more weeks to release a new version fixing this issue.
I plan to include a fix for another issue.

Fixed in 0.13.
It will be available in a day.
Please try that.