编译Android源码：Exception in thread "main" java.lang.UnsupportedClassVersionError:报错解决

报错：
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/verity/BootSignature : Unsupported major.minor version 52.0

解决：设置正确JDK版本即可，如果需要JDK1.8的设置即可：
# emacs /etc/profile
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin:$PATH