While calling "cvs rlog", if some of the changed files are locked, the following error occurs :

.......
cvs rlog -S -d03 Jul 2012 10:50:26 +0200<03 Jul 2012 10:58:16 +0200 MI
.......
cvs rlog: Logging MI/MI/librtpr/rtbiglib
cvs rlog: Logging MI/MI/librtpr/src
cvs rlog: Logging MI/MI/librtpr/test
cvs rlog: Logging MI/MI/librtpr/test/include
cvs rlog: Logging MI/MI/old_libeqpr
cvs rlog: Logging MI/MI/old_libeqpr/src
FATAL: For input string: "3 locked by: mauri;"
java.lang.NumberFormatException: For input string: "3 locked by: mauri;"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at hudson.scm.CvsChangeLogHelper.isChangeValidForFileVersion(CvsChangeLogHelper.java:260)
at hudson.scm.CvsChangeLogHelper.mapCvsLog(CvsChangeLogHelper.java:200)
at hudson.scm.CVSSCM.calculateChangeLog(CVSSCM.java:419)
at hudson.scm.CVSSCM.checkout(CVSSCM.java:831)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1248)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:589)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:494)
at hudson.model.Run.execute(Run.java:1484)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:236

Following is the "cvs rlog" command line output:

cvs -Q rlog -S -d"03 Jul 2012 10:50:26 +0200<03 Jul 2012 10:58:16 +0200" MI

RCS file: /home_new/mauri/jenkins/testrepo/MI/MI/librtpr/Makefile,v
head: 1.3
branch:
locks: strict
mauri: 1.3
access list:
symbolic names:
ACME: 1.1.1.1
first-import: 1.1.1
keyword substitution: kv
total revisions: 4; selected revisions: 1
description:
----------------------------
revision 1.3 locked by: mauri;
date: 2012-07-03 10:54:50 +0200; author: mauri; state: Exp; lines: +0 -1; commitid: YV4vP97yquVGX5bw;
bbb
=============================================================================

It seems the plugin was not able to parse away the substring "locked by: mauri" from the revision line.