Hello, Vincent. Although I'm not a maintainer of this package, you may find these patches useful because they change the make-jpkg's behavior exactly in the way you want, removing JRE/JDK update number from the directory name.
These patches are meant to be applied to files in the package's source tarball, so either edit them or play with "patch" utility parameters if you want to modify files belonging to the installed package.
--- lib/j2sdk.sh 2012-08-19 17:24:59.000000000 +0400
+++ lib/j2sdk.sh 2012-12-23 01:22:27.000000000 +0400
@@ -29,7 +29,7 @@
diskfree "$j2se_required_space"
read_maintainer_info
j2se_package="$j2se_vendor-java$j2se_release-jdk"
- j2se_name="jdk-$j2se_version-$j2se_vendor-$j2se_arch"
+ j2se_name="jdk-$j2se_release-$j2se_vendor-$j2se_arch"
local target="$install_dir$jvm_base$j2se_name"
install -d -m 755 "$( dirname "$target" )"
extract_bin "$archive_path" "$j2se_expected_min_size" "$target"
--- lib/j2re.sh 2012-08-19 17:24:59.000000000 +0400
+++ lib/j2re.sh 2012-12-23 01:30:54.000000000 +0400
@@ -27,7 +27,7 @@
diskfree "$j2se_required_space"
read_maintainer_info
j2se_package="$j2se_vendor-java$j2se_release-jre"
- j2se_name="jre-$j2se_version-$j2se_vendor-$j2se_arch"
+ j2se_name="jre-$j2se_release-$j2se_vendor-$j2se_arch"
local target="$install_dir$jvm_base$j2se_name"
install -d -m 755 "$( dirname "$target" )"
extract_bin "$archive_path" "$j2se_expected_min_size" "$target"
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