[JENKINS-26646] Items.fromNameList is being called with a null parameter

hudson.tasks.BuildTrigger#getChildProjects(hudson.model.ItemGroup) doesn't check if childProjects is null.

Even though childProjects is checked for null in the constructor, this can happen if a BuildTrigger is deserialized from an invalid configuration.

What's worse, is that due to JENKINS-26643">JENKINS-26643, this can prevent Jenkins from starting. Example:

SEVERE: Failed Finalizing set up

java.lang.NullPointerException

at java.util.StringTokenizer.(Unknown Source)

at java.util.StringTokenizer.(Unknown Source)

at hudson.model.Items.fromNameList(Items.java:145)

at hudson.plugins.parameterizedtrigger.BuildTriggerConfig.getProjectList(BuildTriggerConfig.java:125)

at hudson.plugins.parameterizedtrigger.BuildTrigger.buildDependencyGraph(BuildTrigger.java:74)

at hudson.util.DescribableList.buildDependencyGraph(DescribableList.java:213)

at hudson.model.Project.buildDependencyGraph(Project.java:201)

at hudson.model.DependencyGraph.build(DependencyGraph.java:95)

at jenkins.model.Jenkins.rebuildDependencyGraph(Jenkins.java:3738)

at jenkins.model.Jenkins$20.run(Jenkins.java:2680)

at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)

at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)

at jenkins.model.Jenkins$7.runTask(Jenkins.java:886)

at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)

at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

---
Originally reported by recampbell, imported from: Items.fromNameList is being called with a null parameter

• assignee: huybrechts
  
• status: Open
  
• priority: Minor
  
• component(s): parameterized-trigger-plugin
  
• label(s): robustness
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 2025-12-07
  

hudson.tasks.BuildTrigger#getChildProjects(hudson.model.ItemGroup) doesn't check if childProjects is null.


Even though childProjects is checked for null in the constructor, this can happen if a BuildTrigger is deserialized from an invalid configuration.


What's worse, is that due to JENKINS-26643, this can prevent Jenkins from starting.  Example:


SEVERE: Failed Finalizing set up

 java.lang.NullPointerException

       at java.util.StringTokenizer.<init>(Unknown Source)

       at java.util.StringTokenizer.<init>(Unknown Source)

       at hudson.model.Items.fromNameList(Items.java:145)

       at hudson.plugins.parameterizedtrigger.BuildTriggerConfig.getProjectList(BuildTriggerConfig.java:125)

       at hudson.plugins.parameterizedtrigger.BuildTrigger.buildDependencyGraph(BuildTrigger.java:74)

       at hudson.util.DescribableList.buildDependencyGraph(DescribableList.java:213)

       at hudson.model.Project.buildDependencyGraph(Project.java:201)

       at hudson.model.DependencyGraph.build(DependencyGraph.java:95)

       at jenkins.model.Jenkins.rebuildDependencyGraph(Jenkins.java:3738)

       at jenkins.model.Jenkins$20.run(Jenkins.java:2680)

       at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)

       at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)

       at jenkins.model.Jenkins$7.runTask(Jenkins.java:886)

       at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)

       at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)

       at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

       at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

       at java.lang.Thread.run(Unknown Source)