【FAQ】ubuntu：java opensdk 7 如何升级到 8？

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因要装 SonarQube，必须要升级到 8 才行（SONAR_Requirements）。当前 opensdk 版本为 7：

# java -versionjava version "1.7.0_101"OpenJDK Runtime Environment (IcedTea 2.6.6) (7u101-2.6.6-0ubuntu0.14.04.1)OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)

升级步骤后如下：

1，安装 opensdk 8：

# add-apt-repository ppa:openjdk-r/ppa# apt-get update# apt-get install openjdk-8-jdk

2，为了避免版本差异，7 暂时保留，故先手工切换默认 opensdk：

# update-java-alternatives -ljava-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64java-1.8.0-openjdk-amd64 1069 /usr/lib/jvm/java-1.8.0-openjdk-amd64

# update-alternatives --config javaThere are 2 choices for the alternative java (providing /usr/bin/java).  Selection    Path                                            Priority   Status------------------------------------------------------------  0            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      auto mode  1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode* 2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1069      manual modePress enter to keep the current choice[*], or type selection number: 2

# java -versionopenjdk version "1.8.0_91"OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-0ubuntu4~14.04-b14)OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)

大功告成：）

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