JDK8 RPM postinstall scriptlet assumes /usr/share/man/man1 exists

This minor installation problem can be observed on Linux installations that
are very thin, for example the default oraclelinux:7.2 base Docker image.

Test: Install JDK 8u144 into a very thin Linux installation, which does not
include the "filesystem" package, but that does have the "man" package
installed. When installation is complete, run "java -version" and "man java"
to check installation and documentation.

Expected: Installation completes quietly, version information is displayed,
java man page is loaded.

Actual: Installation appears to complete, but issues some ugly warnings, and
the man pages are missing:

# rpm -iv jdk-8u144-linux-x64.rpm
Preparing packages...
jdk1.8.0_144-2000:1.8.0_144-fcs.x86_64
Unpacking JAR files...
    tools.jar...
    plugin.jar...
    javaws.jar...
    deploy.jar...
    rt.jar...
    jsse.jar...
    charsets.jar...
    localedata.jar...
failed to link /usr/share/man/man1/java.1 -> /etc/alternatives/java.1: No such file or directory
failed to link /usr/share/man/man1/javaws.1 -> /etc/alternatives/javaws.1: No such file or directory
failed to link /usr/share/man/man1/jjs.1 -> /etc/alternatives/jjs.1: No such file or directory
failed to link /usr/share/man/man1/keytool.1 -> /etc/alternatives/keytool.1: No such file or directory
failed to link /usr/share/man/man1/orbd.1 -> /etc/alternatives/orbd.1: No such file or directory
failed to link /usr/share/man/man1/pack200.1 -> /etc/alternatives/pack200.1: No such file or directory
failed to link /usr/share/man/man1/policytool.1 -> /etc/alternatives/policytool.1: No such file or directory
failed to link /usr/share/man/man1/rmid.1 -> /etc/alternatives/rmid.1: No such file or directory
failed to link /usr/share/man/man1/rmiregistry.1 -> /etc/alternatives/rmiregistry.1: No such file or directory
failed to link /usr/share/man/man1/servertool.1 -> /etc/alternatives/servertool.1: No such file or directory
failed to link /usr/share/man/man1/tnameserv.1 -> /etc/alternatives/tnameserv.1: No such file or directory
failed to link /usr/share/man/man1/unpack200.1 -> /etc/alternatives/unpack200.1: No such file or directory
failed to link /usr/share/man/man1/appletviewer.1 -> /etc/alternatives/appletviewer.1: No such file or directory
failed to link /usr/share/man/man1/extcheck.1 -> /etc/alternatives/extcheck.1: No such file or directory
failed to link /usr/share/man/man1/idlj.1 -> /etc/alternatives/idlj.1: No such file or directory
failed to link /usr/share/man/man1/jar.1 -> /etc/alternatives/jar.1: No such file or directory
failed to link /usr/share/man/man1/jarsigner.1 -> /etc/alternatives/jarsigner.1: No such file or directory
failed to link /usr/share/man/man1/java.1 -> /etc/alternatives/java.1: No such file or directory
failed to link /usr/share/man/man1/javac.1 -> /etc/alternatives/javac.1: No such file or directory
failed to link /usr/share/man/man1/javadoc.1 -> /etc/alternatives/javadoc.1: No such file or directory
failed to link /usr/share/man/man1/javafxpackager.1 -> /etc/alternatives/javafxpackager.1: No such file or directory
failed to link /usr/share/man/man1/javah.1 -> /etc/alternatives/javah.1: No such file or directory
failed to link /usr/share/man/man1/javap.1 -> /etc/alternatives/javap.1: No such file or directory
failed to link /usr/share/man/man1/javapackager.1 -> /etc/alternatives/javapackager.1: No such file or directory
failed to link /usr/share/man/man1/javaws.1 -> /etc/alternatives/javaws.1: No such file or directory
failed to link /usr/share/man/man1/jcmd.1 -> /etc/alternatives/jcmd.1: No such file or directory
failed to link /usr/share/man/man1/jconsole.1 -> /etc/alternatives/jconsole.1: No such file or directory
failed to link /usr/share/man/man1/jdb.1 -> /etc/alternatives/jdb.1: No such file or directory
failed to link /usr/share/man/man1/jdeps.1 -> /etc/alternatives/jdeps.1: No such file or directory
failed to link /usr/share/man/man1/jhat.1 -> /etc/alternatives/jhat.1: No such file or directory
failed to link /usr/share/man/man1/jinfo.1 -> /etc/alternatives/jinfo.1: No such file or directory
failed to link /usr/share/man/man1/jjs.1 -> /etc/alternatives/jjs.1: No such file or directory
failed to link /usr/share/man/man1/jmap.1 -> /etc/alternatives/jmap.1: No such file or directory
failed to link /usr/share/man/man1/jmc.1 -> /etc/alternatives/jmc.1: No such file or directory
failed to link /usr/share/man/man1/jps.1 -> /etc/alternatives/jps.1: No such file or directory
failed to link /usr/share/man/man1/jrunscript.1 -> /etc/alternatives/jrunscript.1: No such file or directory
failed to link /usr/share/man/man1/jsadebugd.1 -> /etc/alternatives/jsadebugd.1: No such file or directory
failed to link /usr/share/man/man1/jstack.1 -> /etc/alternatives/jstack.1: No such file or directory
failed to link /usr/share/man/man1/jstat.1 -> /etc/alternatives/jstat.1: No such file or directory
failed to link /usr/share/man/man1/jstatd.1 -> /etc/alternatives/jstatd.1: No such file or directory
failed to link /usr/share/man/man1/jvisualvm.1 -> /etc/alternatives/jvisualvm.1: No such file or directory
failed to link /usr/share/man/man1/keytool.1 -> /etc/alternatives/keytool.1: No such file or directory
failed to link /usr/share/man/man1/native2ascii.1 -> /etc/alternatives/native2ascii.1: No such file or directory
failed to link /usr/share/man/man1/orbd.1 -> /etc/alternatives/orbd.1: No such file or directory
failed to link /usr/share/man/man1/pack200.1 -> /etc/alternatives/pack200.1: No such file or directory
failed to link /usr/share/man/man1/policytool.1 -> /etc/alternatives/policytool.1: No such file or directory
failed to link /usr/share/man/man1/rmic.1 -> /etc/alternatives/rmic.1: No such file or directory
failed to link /usr/share/man/man1/rmid.1 -> /etc/alternatives/rmid.1: No such file or directory
failed to link /usr/share/man/man1/rmiregistry.1 -> /etc/alternatives/rmiregistry.1: No such file or directory
failed to link /usr/share/man/man1/schemagen.1 -> /etc/alternatives/schemagen.1: No such file or directory
failed to link /usr/share/man/man1/serialver.1 -> /etc/alternatives/serialver.1: No such file or directory
failed to link /usr/share/man/man1/servertool.1 -> /etc/alternatives/servertool.1: No such file or directory
failed to link /usr/share/man/man1/tnameserv.1 -> /etc/alternatives/tnameserv.1: No such file or directory
failed to link /usr/share/man/man1/unpack200.1 -> /etc/alternatives/unpack200.1: No such file or directory
failed to link /usr/share/man/man1/wsgen.1 -> /etc/alternatives/wsgen.1: No such file or directory
failed to link /usr/share/man/man1/wsimport.1 -> /etc/alternatives/wsimport.1: No such file or directory
failed to link /usr/share/man/man1/xjc.1 -> /etc/alternatives/xjc.1: No such file or directory
warning: %post(jdk1.8.0_144-2000:1.8.0_144-fcs.x86_64) scriptlet failed, exit status 2
# echo $?
0