CentOS7编译jdk8

拉取 jdk8 的源码

这里准备了一份：https://github.com/susamlu/jdk20240618，branch：jdk8-b120

使用 Linux 编译 jdk8

系统版本：CentOS Linux release 7.9.2009 (Core)

安装 jdk7

下载地址：https://www.oracle.com/java/technologies/javase/javase7-archi...

1. 我下载的是：jdk-7u80-linux-x64.tar.gz
2. 解压：tar -zxvf jdk-7u80-linux-x64.tar.gz

3. 配置：

   • vim ~/.bash_profile
   • source ~/.bash_profile

   export JAVA_HOME=/home/jdk/jdk1.7.0_80
   export JRE_HOME=${JAVA_HOME}/jre
   export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
   export PATH=${JAVA_HOME}/bin:$PATH

4. 验证：java -version

编译过程

1. bash configure

1. configure: error: Could not find a C compiler. You might be able to fix this by running 'sudo yum groupinstall "Development Tools"'.

   sudo yum groupinstall "Development Tools" -y

2. configure: error: Could not find X11 libraries. You might be able to fix this by running 'sudo yum install libXtst-devel libXt-devel libXrender-devel'.

   sudo yum install libXtst-devel libXt-devel libXrender-devel -y

3. configure: error: Could not find cups! You might be able to fix this by running 'sudo yum install cups-devel'.

   sudo yum install cups-devel -y

4. configure: error: Could not find freetype! You might be able to fix this by running 'sudo yum install freetype-devel'.

   sudo yum install freetype-devel -y

5. configure: error: Could not find alsa! You might be able to fix this by running 'sudo yum install alsa-lib-devel'.

   sudo yum install alsa-lib-devel -y

6. Build performance tip: ccache gives a tremendous speedup for C++ recompilations.
   You do not have ccache installed. Try installing it.
   You might be able to fix this by running 'sudo yum install ccache'.

   sudo yum install ccache -y

2. make clean

3. make all

1. Error: time is more than 10 years from present: 1388527200000
   修改 jdk 源码：GenerateCurrencyData.java，10 年改成 100 年

   long time = format.parse(timeString).getTime();
   if (Math.abs(time - System.currentTimeMillis()) > ((long) 10) * 365 * 24 * 60 * 60 * 1000) {
    throw new RuntimeException("time is more than 10 years from present: " + time);
   }
    
   -->
    
   long time = format.parse(timeString).getTime();
   if (Math.abs(time - System.currentTimeMillis()) > ((long) 100) * 365 * 24 * 60 * 60 * 1000) {
    throw new RuntimeException("time is more than 100 years from present: " + time);
   }

   编译成功，就可以测试了

测试 jdk8

1. 配置：

   • vim ~/.bash_profile
   • source ~/.bash_profile

   export JAVA_HOME=/home/jdk/jdk/build/linux-x86_64-normal-server-release/images/j2sdk-image
   export JRE_HOME=${JAVA_HOME}/jre
   export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
   export PATH=${JAVA_HOME}/bin:$PATH

2. 验证版本：java -version

   openjdk version "1.8.0-internal"
   OpenJDK Runtime Environment (build 1.8.0-internal-jdk_2024_06_17_20_18-b00)
   OpenJDK 64-Bit Server VM (build 25.0-b62, mixed mode)

3. 使用代码验证
   测试代码：

   public class JvmTest {
    
    public static void main(String[] args) {
        System.out.println(System.getProperty("os.name"));
        System.out.println(System.getProperty("user.home"));
        System.out.println(System.getProperty("java.version"));
        System.out.println(System.getProperty("java.vendor.url"));
    }
    
   }

   javac JvmTest.java
   java JvmTest

   Linux
   /home/jdk
   1.8.0-internal
   http://java.oracle.com/