CentOS安装Jenkins启动报 Permission denied

centos安装jenkins，安装好之后，启动，报权限不足的错误，但是相应文件的权限已经全部设置好了，求大神帮帮忙，是什么原因导致的。错误如下：

[root@localhost bin]# service jenkins start
Starting Jenkins bash: /home/renrui/java/jdk1.7/bin/java: Permission denied
                                                           [FAILED]

/home/renrui/java/jdk1.7/bin/java 文件的权限都是满的：

[root@localhost bin]# ll /home/renrui/java/jdk1.7/bin/
total 752
-rwxrwxrwx. 1 root root   7949 Sep 27  2014 appletviewer
-rwxrwxrwx. 1 root root   7925 Sep 27  2014 apt
lrwxrwxrwx. 1 root root      8 Jan 14 11:39 ControlPanel -> jcontrol
-rwxrwxrwx. 1 root root   7925 Sep 27  2014 extcheck
-rwxrwxrwx. 1 root root   7957 Sep 27  2014 idlj
-rwxrwxrwx. 1 root root   7909 Sep 27  2014 jar
-rwxrwxrwx. 1 root root   7925 Sep 27  2014 jarsigner
-rwxrwxrwx. 1 root root   7718 Sep 27  2014 java
-rwxrwxrwx. 1 root root   7925 Sep 27  2014 javac
-rwxrwxrwx. 1 root root   7925 Sep 27  2014 javadoc
-rwxrwxrwx. 1 root root   2052 Sep 27  2014 javafxpackager
-rwxrwxrwx. 1 root root   7925 Sep 27  2014 javah

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关掉selinux，还有，777这种还是少用