Description of problem:

An attempt to update xerces-j2 package fails with:

/var/tmp/rpm-tmp.28106: line 3: rebuild-gcj-db: command not found
error: %post(xerces-j2-2.6.2-4jpp_4fc.x86_64) scriptlet failed, exit status 127

This scriplet does (on x86_64)

update-alternatives --install /usr/share/java/jaxp_parser_impl.jar \
  jaxp_parser_impl /usr/share/java/xerces-j2.jar 40
rebuild-gcj-db /usr/lib64

The trouble is that 'rebuild-gcj-db' is indeed not there and xerces-j2
is not dependent on some package which could provide this.  In an effect
one is left with remains of xerces-j2-2.6.2-4jpp_3fc and partially
installed xerces-j2-2.6.2-4jpp_4fc with both reported by rpm as present.

Version-Release number of selected component (if applicable):
xerces-j2-2.6.2-4jpp_4fc