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安装 Java 1.8 JRE
dnf install java-1.8.0-openjdk
安装 Java 1.8 JDK
dnf install java-1.8.0-openjdk-devel
当我们安装 maven 的时候会自动安装 Java 11,需要使用下面方法切换默认Java版本
[root@cloud ~]# 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-1.8.0.342.b07-1.el9_0.x86_64/jre/bin/java) *+ 2 java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.16.0.8-1.el9_0.x86_64/bin/java) Enter to keep the current selection[+], or type selection number: 1 [root@cloud ~]# alternatives --config javac There are 2 programs which provide 'javac'. Selection Command ----------------------------------------------- 1 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el9_0.x86_64/bin/javac) *+ 2 java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.16.0.8-1.el9_0.x86_64/bin/javac) Enter to keep the current selection[+], or type selection number: 1
[root@cloud ~]# javac -version javac 1.8.0_342 [root@cloud ~]# java -version openjdk version "1.8.0_342" OpenJDK Runtime Environment (build 1.8.0_342-b07) OpenJDK 64-Bit Server VM (build 25.342-b07, mixed mode)