Java没有安装unix问题

我在Linux Centos 6上.

我在我的机器上安装了Java JRE和JDK.

[root@mhsapp002 conf]# java -version
java version "1.7.0_60"
Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)


[root@mhsapp002 conf]# javac -version
javac 1.7.0_55

另外,我手动将JAVA_HOME设置在.bash_profile文件中.

PATH=$PATH:$HOME/bin
export PATH
export JAVA_HOME=/opt/java/jre1.7.0_60
export PATH=/opt/java/jre1.7.0_60/bin:$PATH


[root@mhsapp002 conf]# echo $JAVA_HOME
/opt/java/jre1.7.0_60

此外,我已尝试在使用中设置两个选项alternatives.

[root@mhsapp002 conf]# alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           /opt/java/jre1.7.0_60/bin/java
*+ 2           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java



[root@mhsapp002 conf]# readlink -f $(which java)
/opt/java/jre1.7.0_60/bin/java

现在我正在尝试安装datastax opscenter-agent,它需要机器上的java.但它失败并出现以下错误:

某些代理安装失败:

- 127.0.0.1: Failure installing agent on 127.0.0.1.
Standard output:
Unable to find a java executable!
Please install java or set JAVA_HOME.

Exit code: 4

您对失败的原因有什么想法或建议吗？谢谢你的帮助!