找到openjdk網站(http://hg.openjdk.java.net/) 選擇需要編譯的版本,瀏覽readme文件,有獲取源碼及編譯步驟
CentOS-7-x86_64-DVD-1804.iso
vim /etc/sysconfig/network-scripts/ifcfg-ens33- 設置ONBOOT=yes
- 重啟網絡服務systemctl restart network
源代碼及Bootstrap JDK准備
Bootstrap JDK移至/usr/local/java
cd /usr/local/java
tar -xzvf jdk-8u40-linux-x64.gz
yum install mercurial
hg clone http://hg.openjdk.java.net/jdk8u/jdk8u-dev/
cd jdk8u-dev
sh ./get_source.sh
環境准備
bash ./configure
根據提示yum install 安裝所有缺少的依賴
直至運行bash ./configure出現下面
A new configuration has been successfully created in
/usr/local/java/jdk8u-dev/build/linux-x86_64-normal-server-release
using default settings.
Configuration summary:
* Debug level: release
* JDK variant: normal
* JVM variants: server
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64
Tools summary:
* Boot JDK: openjdk version "1.8.0_232" OpenJDK Runtime Environment (build 1.8.0_232-b09) OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode) (at /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64)
* Toolchain: gcc (GNU Compiler Collection)
* C Compiler: Version 4.8.5 (at /usr/bin/gcc)
* C++ Compiler: Version 4.8.5 (at /usr/bin/g++)
Build performance summary:
* Cores to use: 1
* Memory limit: 974 MB
編譯
make all
----- Build times -------
Start 2019-11-20 14:30:45
End 2019-11-20 15:20:07
00:00:37 corba
00:00:42 demos
00:06:47 docs
00:14:52 hotspot
00:01:36 images
00:00:24 jaxp
00:00:32 jaxws
00:22:51 jdk
00:00:44 langtools
00:00:16 nashorn
00:49:22 TOTAL
-------------------------
Finished building OpenJDK for target 'all'
使用
- 進入image文件夾
cd build/linux-x86_64-normal-server-release/images/j2sdk-image/bin - 查看此java版本
[root@localhost bin]# ./java -version
openjdk version "1.8.0-internal"
OpenJDK Runtime Environment (build 1.8.0-internal-root_2019_11_20_14_27-b00)
OpenJDK 64-Bit Server VM (build 25.71-b00, mixed mode)
之后這個整個 j2sdk-image 文件夾就可以被拷貝到任何地方，並配置環境變量使用
export JAVA_HOME=/usr/用戶名/java/OpenJDK_1.8.0
export CLASSPATH=./:$JAVA_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH
之后source .bash_profile使環境變量生效，用java -version查看結果