This is new in 1.3.33. I have downgraded to 1.3.29 to avoid the issue on my end.

The bug appears to be caused by the new date parsing. Intermittently, changes will throw the following exception and fail our builds:

Caught exception communicating with perforce. Failed to retrieve changelist.
at com.tek42.perforce.parse.ChangelistBuilder.build(ChangelistBuilder.java:254)
at com.tek42.perforce.parse.Changes.getChangelist(Changes.java:69)
at com.tek42.perforce.parse.Changes.getChangelistsFromNumbers(Changes.java:431)
at hudson.plugins.perforce.PerforceSCM.checkout(PerforceSCM.java:1073)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1257)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:622)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:528)
at hudson.model.Run.execute(Run.java:1745)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:453)
at java.lang.Long.parseLong(Long.java:483)
at java.text.DigitList.getLong(DigitList.java:194)
at java.text.DecimalFormat.parse(DecimalFormat.java:1316)
at java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:2088)
at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1455)
at java.text.DateFormat.parse(DateFormat.java:355)
at com.tek42.perforce.parse.ChangelistBuilder.parseDateWithTimezone(ChangelistBuilder.java:286)
at com.tek42.perforce.parse.ChangelistBuilder.build(ChangelistBuilder.java:109)
... 11 more