libisrt-java version 4.8.20100629-1 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 libisrt-java version 4.8.20100629-1.

See attached log for full build failure details.

This log snippet might also be of interest:

                                                  ^
src/de/intarsys/tools/stream/StreamTools.java:161: warning: unmappable character for encoding ASCII
  * Parametern angegeben wurde. Fehler beim Schlie?en der Datenstr?me werden
                                                                  ^
Note: src/de/intarsys/tools/string/StringTools.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
11 warnings
find src -name *.java -and -type f -print0 | xargs -0 /usr/lib/jvm/default-java/bin/javadoc -classpath :debian/_jh_build.isrt -d debian/_jh_build.javadoc/api -quiet
Creating destination directory: "debian/_jh_build.javadoc/api/"
src/de/intarsys/tools/xml/EntityDecoder.java:34: error: unmappable character for encoding ASCII
     return "?";
             ^
src/de/intarsys/tools/xml/EntityDecoder.java:37: error: unmappable character for encoding ASCII
     return "?";
             ^
src/de/intarsys/tools/xml/EntityDecoder.java:40: error: unmappable character for encoding ASCII
     return "?";
             ^
src/de/intarsys/tools/xml/EntityDecoder.java:43: error: unmappable character for encoding ASCII
     return "?";
             ^
src/de/intarsys/tools/xml/EntityDecoder.java:46: error: unmappable character for encoding ASCII
     return "?";
             ^
src/de/intarsys/tools/xml/EntityDecoder.java:49: error: unmappable character for encoding ASCII
     return "?";
             ^
src/de/intarsys/tools/stream/StreamTools.java:159: error: unmappable character for encoding ASCII
  * Kopiert einen Eingabedatenstrom auf einen Ausgabedatenstrom. Anschlie?end
                                                                         ^
src/de/intarsys/tools/stream/StreamTools.java:160: error: unmappable character for encoding ASCII
  * (finally) werden die Datenstr?me geschlossen(!), sofern dies in den
                                 ^
src/de/intarsys/tools/stream/StreamTools.java:161: error: unmappable character for encoding ASCII
  * Parametern angegeben wurde. Fehler beim Schlie?en der Datenstr?me werden
                                                  ^
src/de/intarsys/tools/stream/StreamTools.java:161: error: unmappable character for encoding ASCII
  * Parametern angegeben wurde. Fehler beim Schlie?en der Datenstr?me werden
                                                                  ^
10 errors
make: *** [build] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
────────────────────────────────────────────────────────────────────────────────
Build finished at 20111110-2017

Finished
────────

E: Build failure (dpkg-buildpackage died)