It looks caused for "Timeout minutes" isn't set.

But that's strange:
As far as I know, you can never configure build-timeout in that way...
An empty string should be set even if you leave the field empty.
You can never have that field completely unset.

I'll test the behavior with Jenkins 1.647 and see whethet I can reproduce the problem.
Please let me know if you know the exact steps to reproduce the problem.

I could not reproduce the problem.
Please report detailed steps to reproduce that problem.

Steps I tested:

1. Launch newly installed Jenkins 1.647.
2. Go to Manage Jenkins > Manage Plugin and install build timeout plugin (1.16)
3. Go back to dashboard, and create a freestyle project.
4. Check "Abort the build if it's stuck"
   • Time-out strategy: Absolute
     • Timeout minutes: (empty) (The initial value is 3)
   • Time-out variable: (empty)
   • Time-out actions: (none)
5. Save the project.
6. Run a build

Result:

• The build failed with the message:

  FATAL: For input string: ""
  java.lang.NumberFormatException: For input string: ""
  	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
  	at java.lang.Integer.parseInt(Integer.java:504)
  	at java.lang.Integer.parseInt(Integer.java:527)
  	at hudson.plugins.build_timeout.impl.AbsoluteTimeOutStrategy.getTimeOut(AbsoluteTimeOutStrategy.java:44)
  	at hudson.plugins.build_timeout.BuildTimeoutWrapper$EnvironmentImpl.<init>(BuildTimeoutWrapper.java:166)
  	at hudson.plugins.build_timeout.BuildTimeoutWrapper.setUp(BuildTimeoutWrapper.java:211)
  	at hudson.model.Build$BuildExecution.doRun(Build.java:156)
  	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
  	at hudson.model.Run.execute(Run.java:1738)
  	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
  	at hudson.model.ResourceController.execute(ResourceController.java:98)
  	at hudson.model.Executor.run(Executor.java:410)
  

I encountered this after accidentally entering "19" for the "Time-out variable".
Definitely would have appreciated a more helpful error than "FATAL: null"

I've updated the Description with Steps to Reproduce for my case
Thx

I can't reproduce the issue yet even with "19" for "Time-out variable".

Please let me know followings:

• Versions of your Jenkins and build-timeout plugin
• Attach config.xml of the project when the problem occurs
  • It is usually located at ${JENKINS_HOME}/jobs/(project name)/config.xml
• What is displayed for "Timeout minutes" when you reopen the project configuration page.
• The web browser you use
  • This sounds like a configuration issue, and might occur only with specific browsers.

I decided to close this issue with "Won't Fix" as:

1. There's no way to reproduce the issue. It looks caused by a broken configuration and I can't ensure behaviors for those cases.

2. Even if I fixed the NPE, build-timeout shouldn't work as expected without configurations.