Step 0 - インストール先
$ cat /etc/redhat-release Red Hat Enterprise Linux release 8.4 (Ootpa) $ uname --all Linux rhel8.a5.jp 4.18.0-305.el8.x86_64 #1 SMP Thu Apr 29 08:54:30 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux
Step 1 - ダウンロード
download java6 from https://www.oracle.com/java/technologies/oracle-java-archive-downloads.html
Step 2 - javaをインストール
と言っても、自己解凍ファイルの jdk-6u45-linux-x64.bin を実行するだけ。
$ sudo su - # cd /usr/local # mkdir java # cd java # cp ~end0tknr/tmp/jdk-6u45-linux-x64.bin . # ./jdk-6u45-linux-x64.bin Unpacking... Checksumming... Extracting... UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu). creating: jdk1.6.0_45/ creating: jdk1.6.0_45/db/ creating: jdk1.6.0_45/db/bin/ inflating: jdk1.6.0_45/db/bin/ij inflating: jdk1.6.0_45/db/bin/NetworkServerControl inflating: jdk1.6.0_45/db/bin/setNetworkClientCP.bat inflating: jdk1.6.0_45/db/bin/setEmbeddedCP.bat ＜略＞ creating: jdk1.6.0_45/include/linux/ inflating: jdk1.6.0_45/include/linux/jawt_md.h inflating: jdk1.6.0_45/include/linux/jni_md.h inflating: jdk1.6.0_45/include/jvmti.h inflating: jdk1.6.0_45/include/jawt.h inflating: jdk1.6.0_45/include/jdwpTransport.h inflating: jdk1.6.0_45/include/classfile_constants.h inflating: jdk1.6.0_45/COPYRIGHT Creating jdk1.6.0_45/jre/lib/rt.jar Creating jdk1.6.0_45/jre/lib/jsse.jar Creating jdk1.6.0_45/jre/lib/charsets.jar Creating jdk1.6.0_45/lib/tools.jar Creating jdk1.6.0_45/jre/lib/ext/localedata.jar Creating jdk1.6.0_45/jre/lib/plugin.jar Creating jdk1.6.0_45/jre/lib/javaws.jar Creating jdk1.6.0_45/jre/lib/deploy.jar Done. #
Step 3 - libnsl.so.1 を追加インストール
rhel8では、libnsl.so が含まれなくなったらしく、 以下を参考に yum で、これをインストール。
RHEL 8へのインストール中に「libnsl.so.1 が必要ですが、見つかりません」メッセージが表示される
$ /usr/local/java/jdk1.6.0_45/bin/java -version Error occurred during initialization of VM Unable to load native library: libnsl.so.1: cannot open shared object file: No such file or directory $ sudo yum install /lib64/libnsl.so.1 $ /usr/local/java/jdk1.6.0_45/bin/java -version java version "1.6.0_45" Java(TM) SE Runtime Environment (build 1.6.0_45-b06) Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)
Step 4 - alternatives にjavaを登録
# alternatives --install /usr/local/java_home java_home /usr/local/java/jdk1.6.0_45 1 # alternatives --config java_home There is 1 program that provides 'java_home'. Selection Command ----------------------------------------------- *+ 1 /usr/local/java/jdk1.6.0_45 # vi /etc/bashrc export JAVA_HOME=/usr/local/java_home export PATH=$PATH:$JAVA_HOME/bin export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar $ which java /usr/local/java_home/bin/java
