1. hadoop-env.sh JDK¼³Á¤[hadoop@localhost ~] $ nano 2.2.0/etc/hadoop/hadoop-env.sh2. The java implementation to use.export JAVA_HOME=/home/hadoop/jdk3. ÀúÀå½Ã ctrl+x click -> y ÀÔ·Â -> enter Ŭ¸¯