objenesis version 1.2+full-1 failed to build with openjdk-7

During a rebuild test on precise with default-jdk switched to openjdk-7, a build failure was detected for objenesis version 1.2+full-1.

See attached log for full build failure details.

This log snippet might also be of interest:

Results :

Tests run: 9, Failures: 0, Errors: 0, Skipped: 0

[INFO] [jar:jar {execution: default-jar}]
[INFO] Building jar: /«BUILDDIR»/objenesis-1.2+full/main/target/objenesis-1.2.jar
[INFO] [javadoc:jar {execution: attach-javadocs}]
[WARNING] Source files encoding has not been set, using platform encoding ANSI_X3.4-1968, i.e. build is platform dependent!
[INFO]
Loading source files for package org.objenesis.strategy...
Loading source files for package org.objenesis...
Loading source files for package org.objenesis.instantiator...
Loading source files for package org.objenesis.instantiator.perc...
Loading source files for package org.objenesis.instantiator.basic...
Loading source files for package org.objenesis.instantiator.gcj...
Loading source files for package org.objenesis.instantiator.sun...
Loading source files for package org.objenesis.instantiator.jrockit...
2 errors
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] MavenReportException: Error while creating archive:
Exit code: 1 - /«BUILDDIR»/objenesis-1.2+full/main/src/org/objenesis/instantiator/jrockit/JRockit131Instantiator.java:10: error: unmappable character for encoding ANSI_X3.4-1968
 * Originally developed by Leonardo Mesquita. Copyright notice added by Henrik St?hl, BEA JRockit Product Manager.
                                                                                 ^
/«BUILDDIR»/objenesis-1.2+full/main/src/org/objenesis/instantiator/jrockit/JRockitLegacyInstantiator.java:10: error: unmappable character for encoding ANSI_X3.4-1968
 * Originally developed by Leonardo Mesquita. Copyright notice added by Henrik St?hl, BEA JRockit Product Manager.
                                                                                 ^

Command line was: /usr/lib/jvm/java-7-openjdk-amd64/jre/../bin/javadoc @options @packages

Refer to the generated Javadoc files in '/«BUILDDIR»/objenesis-1.2+full/main/target/apidocs' dir.

[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12 seconds
[INFO] Finished at: Thu Nov 10 13:37:30 UTC 2011
[INFO] Final Memory: 27M/266M
[INFO] ------------------------------------------------------------------------
make: *** [mvn-build] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
────────────────────────────────────────────────────────────────────────────────
Build finished at 20111110-1337

Finished
────────

E: Build failure (dpkg-buildpackage died)