45 lines
1.4 KiB
Markdown
45 lines
1.4 KiB
Markdown
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# Setup Java
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* download OpenJDK from the [Eclipse Foundation](https://adoptium.net/)
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* extract JDK to target folder
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```
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sudo tar -xvzf ./OpenJDK17U-jdk_x64_linux_hotspot_17.0.2_8.tar.gz -C /usr/lib/jvm/open-jdk-17 --strip-components=1
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sudo tar -xvzf ./OpenJDK11U-jdk_x64_linux_hotspot_11.0.14.1_1.tar.gz -C /usr/lib/jvm/open-jdk-11/ --strip-components=1
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```
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* check if any JDK is already installed
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```
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update-alternatives --list java
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```
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* install JDK 17
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```
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sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/open-jdk-17/bin/java 1
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sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/open-jdk-17/bin/javac 1
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sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/open-jdk-17/bin/jar 1
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sudo update-alternatives --install /usr/bin/jshell jshell /usr/lib/jvm/open-jdk-17/bin/jshell 1
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```
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* install JDK 11
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```
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sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/open-jdk-11/bin/java 2
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sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/open-jdk-11/bin/javac 2
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sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/open-jdk-11/bin/jar 2
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sudo update-alternatives --install /usr/bin/jshell jshell /usr/lib/jvm/open-jdk-11/bin/jshell 2
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```
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* chose JDK version
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```
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sudo update-alternatives --config java
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```
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* verify installation and configuratin
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```
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java -version
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javac -version
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jar --version
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jshell -version
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sudo update-alternatives --display java
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```
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