[root@]yum install rpm-build gcc-java
=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Updating:
 gcc-java                i386       4.1.2-42.el5     base              2.9 M
 rpm-build               i386       4.4.2-48.el5     base              553 k
Updating for dependencies:
 cpp                     i386       4.1.2-42.el5     base              2.7 M
 gcc                     i386       4.1.2-42.el5     base              5.2 M
 gcc-c++                 i386       4.1.2-42.el5     base              3.4 M
 gcc-gnat                i386       4.1.2-42.el5     base               11 M
 gcc-objc                i386       4.1.2-42.el5     base              2.6 M
 libgcc                  i386       4.1.2-42.el5     base               93 k
 libgcj                  i386       4.1.2-42.el5     base               17 M
 libgcj-devel            i386       4.1.2-42.el5     base              1.4 M
 libgnat                 i386       4.1.2-42.el5     base              989 k
 libgomp                 i386       4.1.2-42.el5     base               82 k
 libobjc                 i386       4.1.2-42.el5     base              101 k
 libstdc++               i386       4.1.2-42.el5     base              360 k
 libstdc++-devel         i386       4.1.2-42.el5     base              2.9 M
 rpm                     i386       4.4.2-48.el5     base              638 k
 rpm-devel               i386       4.4.2-48.el5     base              1.3 M
 rpm-libs                i386       4.4.2-48.el5     base              968 k
 rpm-python              i386       4.4.2-48.el5     base               54 k

Transaction Summary
=============================================================================
Install      0 Package(s)
Update      19 Package(s)
Remove       0 Package(s)

Total download size: 54 M
Is this ok [y/N]: y
[root@]cd /usr/local/src
[root@]wget http://www.jpackage.org/jpackage.asc
[root@]rpm --import jpackage.asc
[root@]wget http://mirrors.sunsite.dk/jpackage/1.7/generic/non-free/SRPMS/java-1.5.0-sun-1.5.0.15-1jpp.nosrc.rpm
[root@]rpm -ivh java-1.5.0-sun-1.5.0.15-1jpp.nosrc.rpm
   1:java-1.5.0-sun         warning: user jasonc does not exist - using root
warning: group jasonc does not exist - using root
warning: user jasonc does not exist - using root%)
warning: group jasonc does not exist - using root
warning: user jasonc does not exist - using root%)
warning: group jasonc does not exist - using root
########################################### [100%]

SUNのサイトから　http://java.sun.com/products/archive/index.html
JDK5update15 の jdk-1_5_0_15-linux-i586.bin をダウンロードして
/usr/src/redhat/SOURCES/ に配置。

[root@]mv /home/ユーザーDIR/jdk-1_5_0_15-linux-i586.bin /usr/src/redhat/SOURCES/
[root@]rpmbuild -ba java-1.5.0-sun.spec
[root@]pwd
/usr/src/redhat/SPECS

[root@]ls /usr/src/redhat/RPMS/i586
java-1.5.0-sun-1.5.0.15-1jpp.i586.rpm        java-1.5.0-sun-fonts-1.5.0.15-1jpp.i586.rpm
java-1.5.0-sun-alsa-1.5.0.15-1jpp.i586.rpm   java-1.5.0-sun-jdbc-1.5.0.15-1jpp.i586.rpm
java-1.5.0-sun-demo-1.5.0.15-1jpp.i586.rpm   java-1.5.0-sun-plugin-1.5.0.15-1jpp.i586.rpm
java-1.5.0-sun-devel-1.5.0.15-1jpp.i586.rpm  java-1.5.0-sun-src-1.5.0.15-1jpp.i586.rpm

できあがり＾－＾