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查看、卸载系统自带jdk[root@localhost~]#rpm–qa|grepgcjjava-1.5.0-gcj-1.5.0.0-29.1.el6.i686libgcj-4.4.4-13.el6.i686卸载jdk

update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-7-sun/bin/java 300 update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/