事象
ORDS のインストールをする際、以下のようなエラーが発生する
実行例
[oracle@hellomyworld]$ java -jar ords.war install advanced
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: oracle/dbtools/launcher/executable/jar/ExecutableJarEntrypoint has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:601)原因
java のバージョンが古いのが原因で、11以上にアップグレードする必要がある
実行例
[oracle@hellomyworld]$ java -version
openjdk version "1.8.0_352"
OpenJDK Runtime Environment (build 1.8.0_352-b08)
OpenJDK 64-Bit Server VM (build 25.352-b08, mixed mode) 対処
java をインストール
yum コマンドを使って新しいバージョンの java をインストールする
yum install java-11-openjdk
新しいバージョンに設定する
update-alternatives --config 'java'
実行例
[root@hellomyworld ~]# yum install java-11-openjdk
[root@hellomyworld ~]# update-alternatives --config 'java'
There are 2 programs which provide 'java'.
Selection Command
-----------------------------------------------
*+ 1 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.352.b08-2.el8_7.x86_64/jre/bin/java)
2 java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.17.0.8-2.el8_6.x86_64/bin/java)
Enter to keep the current selection[+], or type selection number: 2
[root@hellomyworld ~]# java -version
openjdk version "11.0.17" 2022-10-18 LTS
OpenJDK Runtime Environment (Red_Hat-11.0.17.0.8-2.el8_6) (build 11.0.17+8-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-11.0.17.0.8-2.el8_6) (build 11.0.17+8-LTS, mixed mode, sharing)
