colorpicker version 1.0.0-1 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 colorpicker version 1.0.0-1.

See attached log for full build failure details.

This log snippet might also be of interest:

dpkg-buildpackage: export CXXFLAGS from dpkg-buildflags (origin: vendor): -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security
dpkg-buildpackage: export FFLAGS from dpkg-buildflags (origin: vendor): -g -O2
dpkg-buildpackage: export LDFLAGS from dpkg-buildflags (origin: vendor): -Wl,-Bsymbolic-functions -Wl,-z,relro
dpkg-buildpackage: source package colorpicker
dpkg-buildpackage: source version 1.0.0-1
dpkg-buildpackage: source changed by Andrew Ross <email address hidden>
 dpkg-source --before-build colorpicker-1.0.0
dpkg-buildpackage: host architecture amd64
 fakeroot debian/rules clean
dh clean --with javahelper
   dh_testdir
   dh_auto_clean
   jh_clean
   dh_clean
 debian/rules build
dh build --with javahelper
   dh_testdir
   dh_auto_configure
   jh_linkjars
   dh_auto_build
   jh_build
grep-dctrl: debian/control:20: expected a colon
.find com -name *.java -and -type f -print0 | xargs -0 /usr/lib/jvm/default-java/bin/javac -cp :debian/_jh_build.ColorPicker -d debian/_jh_build.ColorPicker -source 1.5
warning: [options] bootstrap class path not set in conjunction with -source 1.5
com/bric/swing/DialogFooter.java:76: warning: unmappable character for encoding ASCII
 * action that the user is most likely to perform if that action isn?t
                                                                    ^
com/bric/swing/DialogFooter.java:82: warning: unmappable character for encoding ASCII
 * the user performs when pressing the button?for example, Erase, Save, or Delete."
                                             ^
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
3 warnings
find com -name *.java -and -type f -print0 | xargs -0 /usr/lib/jvm/default-java/bin/javadoc -link /usr/share/doc/default-jdk-doc/api -link /usr/share/doc/default-jre-headless/api -classpath :debian/_jh_build.ColorPicker -d debian/_jh_build.javadoc/api -quiet
Creating destination directory: "debian/_jh_build.javadoc/api/"
com/bric/swing/DialogFooter.java:76: error: unmappable character for encoding ASCII
 * action that the user is most likely to perform if that action isn?t
                                                                    ^
com/bric/swing/DialogFooter.java:82: error: unmappable character for encoding ASCII
 * the user performs when pressing the button?for example, Erase, Save, or Delete."
                                             ^
2 errors
make: *** [build] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
────────────────────────────────────────────────────────────────────────────────
Build finished at 20111110-1435

Finished
────────

E: Build failure (dpkg-buildpackage died)