Build failed in Jenkins: beam_PostCommit_Java_ValidatesRunner_Spark #3768

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See <https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/3768/display/redirect>

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Started by timer
[EnvInject] - Loading node environment variables.
Building remotely on beam3 (beam) in workspace <https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/apache/beam.git # timeout=10
Fetching upstream changes from https://github.com/apache/beam.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/apache/beam.git +refs/heads/*:refs/remotes/origin/* +refs/pull/${ghprbPullId}/*:refs/remotes/origin/pr/${ghprbPullId}/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision 312c4ab08fce09e1a40b3e112dcfe8a016be415a (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 312c4ab08fce09e1a40b3e112dcfe8a016be415a
Commit message: "Merge pull request #4300 from mariapython/direct-timers-test"
 > git rev-list 312c4ab08fce09e1a40b3e112dcfe8a016be415a # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
[EnvInject] - Executing scripts and injecting environment variables after the SCM step.
[EnvInject] - Injecting as environment variables the properties content 
SPARK_LOCAL_IP=127.0.0.1

[EnvInject] - Variables injected successfully.
Parsing POMs
Discovered a new module org.apache.beam:beam-parent Apache Beam :: Parent
ERROR: Processing failed due to a bug in the code. Please report this to the issue tracker (https://jenkins.io/redirect/report-an-issue).
java.lang.UnsupportedOperationException
	at java.util.AbstractMap.put(AbstractMap.java:209)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.parsePoms(MavenModuleSetBuild.java:1035)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:691)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:496)
	at hudson.model.Run.execute(Run.java:1737)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:543)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:419)
project=hudson.maven.MavenModuleSet@414e3ded[beam_PostCommit_Java_ValidatesRunner_Spark]
project.getModules()=[]
project.getRootModule()=null
FATAL: null
java.lang.UnsupportedOperationException
	at java.util.AbstractMap.put(AbstractMap.java:209)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.parsePoms(MavenModuleSetBuild.java:1035)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:691)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:496)
	at hudson.model.Run.execute(Run.java:1737)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:543)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:419)