libiscwt-java version 5.3.20100629-1 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 libiscwt-java version 5.3.20100629-1.

See attached log for full build failure details.

This log snippet might also be of interest:

src/de/intarsys/cwt/font/truetype/TTFontParser.java:352: warning: unmappable character for encoding ASCII
  * ULONG ulUnicodeRange2 Bits 32?63
                                                ^
src/de/intarsys/cwt/font/truetype/TTFontParser.java:353: warning: unmappable character for encoding ASCII
  * ULONG ulUnicodeRange3 Bits 64?95
                                                ^
src/de/intarsys/cwt/font/truetype/TTFontParser.java:354: warning: unmappable character for encoding ASCII
  * ULONG ulUnicodeRange4 Bits 96?127
                                                ^
src/de/intarsys/cwt/font/FontEnvironment.java:43: warning: FontManager is internal proprietary API and may be removed in a future release
import sun.font.FontManager;
               ^
src/de/intarsys/cwt/swt/image/ImageConverterAwt2Swt.java:53: warning: ByteInterleavedRaster is internal proprietary API and may be removed in a future release
import sun.awt.image.ByteInterleavedRaster;
                    ^
src/de/intarsys/cwt/swt/image/ImageConverterAwt2Swt.java:54: warning: BytePackedRaster is internal proprietary API and may be removed in a future release
import sun.awt.image.BytePackedRaster;
                    ^
src/de/intarsys/cwt/font/FontEnvironment.java:105: warning: FontManager is internal proprietary API and may be removed in a future release
  definition = FontManager.getFontPath(true);
               ^
src/de/intarsys/cwt/font/FontEnvironment.java:105: error: cannot find symbol
  definition = FontManager.getFontPath(true);
                          ^
  symbol: method getFontPath(boolean)
  location: interface FontManager
src/de/intarsys/cwt/swt/image/ImageConverterAwt2Swt.java:290: warning: ByteInterleavedRaster is internal proprietary API and may be removed in a future release
  } else if (raster instanceof ByteInterleavedRaster) {
                               ^
src/de/intarsys/cwt/swt/image/ImageConverterAwt2Swt.java:292: warning: ByteInterleavedRaster is internal proprietary API and may be removed in a future release
   bytes = ((ByteInterleavedRaster) raster).getDataStorage();
             ^
src/de/intarsys/cwt/swt/image/ImageConverterAwt2Swt.java:293: warning: BytePackedRaster is internal proprietary API and may be removed in a future release
  } else if (raster instanceof BytePackedRaster) {
                               ^
src/de/intarsys/cwt/swt/image/ImageConverterAwt2Swt.java:295: warning: BytePackedRaster is internal proprietary API and may be removed in a future release
   bytes = ((BytePackedRaster) raster).getDataStorage();
             ^
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
19 warnings
make: *** [build] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
────────────────────────────────────────────────────────────────────────────────
Build finished at 20111110-1958

Finished
────────

E: Build failure (dpkg-buildpackage died)