$java -version
java version "1.7.0_65"
OpenJDK Runtime Environment (IcedTea 2.5.3) (7u71-2.5.3-2)
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

$ update-java-alternatives -l
java-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64
jdk-8-oracle-x64 318 /usr/lib/jvm/jdk-8-oracle-x64

可以看到系统当前java版本为openjdk 7,系统当前安装了两个java版本,分别是openjdk 7和 oracle jdk 8

然后更改系统默认java为oracle jdk 8

# update-java-alternatives -s jdk-8-oracle-x64
update-alternatives: error: no alternatives for



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