ubuntu安装Eclipse

版本

• ubuntu16.04 64bit
• Eclipse 2019-12 （太高容易崩溃）

  下载：wget https://archive.eclipse.org/technology/epp/downloads/release/2019-12/R/eclipse-java-2019-12-R-linux-gtk-x86_64.tar.gz
  

jdk安装

• 将jdk1.8.0_211-linux-x64.tar.gz解压到/opt下
• 添加环境变量 vi ~/.bashrc

  export JAVA_HOME=/opt/jdk1.8.0_211
  export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
  export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$HOME/bin
  

eclipse安装

• 将eclipse-java-2019-12-R-linux-gtk-x86_64.tar.gz解压到/opt下
• 添加桌面图标
  • cd /usr/share/applications
  • sudo touch eclipse.desktop
  • sudo vim eclipse.desktop

    [Desktop Entry]
    Encoding=UTF-8
    Name=Eclipse
    Comment=Eclipse
    Exec=/opt/eclipse/eclipse
    Icon=/opt/eclipse/icon.xpm
    Terminal=false
    StartupNotify=true
    Type=Application
    Categories=Application;Development;
    

  • sudo chmod u+x eclipse.desktop
  • cp -d eclipse.desktop ~/

eclipse找到jdk

• cd /opt/eclipse
• sudo ln -s /opt/jdk1.8.0_211/jre jre

使用时问题和解决方案

• 问题：Exception in thread “main” java.lang.UnsupportedClassVersionError: com/shanlitech/echat/App has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
  解决方案：运行时eclipse内部是的jre版本比编译时使用的java高。左框项目–右击–Properties–Java Compiler–Compiler compliance level–改为和编译时sdk一样的版本
• 问题：Unbound classpath container:JRE System Library[JavaSE-9] in project
  解决方案：左框项目–右击–Properties–Java Build Path—Libraries—将报错的库版本移除