Ubuntu 16.04安装oracle-java6-installer报错，求Java6替代安装方案

Since Oracle has removed public download links for Java 6, the oracle-java6-installer package can no longer fetch the required binary automatically. Here are two practical methods to get Java 6 up and running for your legacy application:

Method 1: Manual Installation of Oracle Java 6 #

This method lets you use a local copy of the Java 6 binary (you’ll need to obtain this legally—check old backups or trusted archival sources for an unmodified jdk-6u45-linux-x64.bin file):

1. Make the binary executable:
   Navigate to the directory where you saved the file in terminal, then run:

   chmod +x jdk-6u45-linux-x64.bin
   

2. Extract the JDK files:
   Execute the binary to unpack the JDK:

   ./jdk-6u45-linux-x64.bin
   

   This will create a folder named jdk1.6.0_45.
3. Move to a standard system location:
   Use sudo to place the JDK in the common Java directory:

   sudo mkdir -p /usr/lib/jvm
   sudo mv jdk1.6.0_45 /usr/lib/jvm/
   

4. Register with system alternatives:
   Tell Ubuntu about this new Java installation:

   sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.6.0_45/bin/java 100
   sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.6.0_45/bin/javac 100
   

5. Set as default (optional):
   If you want Java 6 to be the system’s default, run:

   sudo update-alternatives --config java
   

   Then enter the number corresponding to /usr/lib/jvm/jdk1.6.0_45/bin/java.
6. Verify the installation:
   Check if Java 6 is working:

   java -version
   

   You should see output like this:

   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)

Method 2: Use OpenJDK 6 (If Your App Supports It) #

Some legacy apps work with OpenJDK 6 instead of Oracle’s version. Since Ubuntu 16.04’s default repos don’t include it, you can temporarily enable older Ubuntu repos to install it:

1. Add the trusty repository:

   sudo add-apt-repository "deb http://old-releases.ubuntu.com/ubuntu/ trusty main universe"
   

2. Update package lists:

   sudo apt-get update
   

3. Install OpenJDK 6:

   sudo apt-get install openjdk-6-jdk
   

4. Register with system alternatives:
   Follow step 4 from Method 1 to set OpenJDK 6 as an option, and step 5 if you want it as default.
5. Remove the old repo (recommended):
   To avoid conflicts with newer packages, disable the trusty repo after installation:

   sudo add-apt-repository --remove "deb http://old-releases.ubuntu.com/ubuntu/ trusty main universe"
   sudo apt-get update
   

Important Notes #

• Java 6 is no longer supported (no security updates), so use it only for your specific legacy app and keep it isolated from other systems if possible.
• Always verify the integrity of any downloaded Java binary to avoid malware risks.

内容的提问来源于stack exchange，提问作者Manas Ranjan Mohapatra