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I have this package of java jdk-7u3-linux-x64.rpm. So I have been doing this normally yum install jdk-7u3-linux-x64.rpm. Then immediately I will do this 

alternatives --install /usr/bin/java java /usr/java/latest/jre/bin/java 20000

alternatives --install /usr/bin/javaws javaws /usr/java/latest/jre/bin/javaws 20000

alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 20000

Next step is this alternatives --config java and pick the latest one. Suddenly this particular machine I am having issue when I run this 2 commands it shows me different version of java and javac causing my programme can't be compiled.

Below is all the java

alternatives --config java

There are 4 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
   2           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
   3           /usr/lib/jvm/jre-1.5.0-gcj/bin/java
 + 4           /usr/java/latest/jre/bin/java

Enter to keep the current selection[+], or type selection number:

Java version is as below

java -version
java version "1.7.0_03"
Java(TM) SE Runtime Environment (build 1.7.0_03-b04)
Java HotSpot(TM) 64-Bit Server VM (build 22.1-b02, mixed mode)

But my javac -version is

javac -version
javac 1.7.0_19

I am very surprised -- where does the 1.7.0_19 come from, because my installation version is just 1.7.0_03?

Any idea how to resolve this?

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10
  • What do you get when you run "which java" and "which javac" ? Commented May 22, 2013 at 16:53
  • @John I get /usr/bin/java and /usr/bin/javac Commented May 22, 2013 at 17:01
  • Are they symlinks? If so, follow them to their ultimate actual binaries. You can also try "rpm -qf <path>" on each of them to find out what package they are owned by - preferrably using the ultimate binary after following any symlink chain. Commented May 22, 2013 at 17:03
  • @What are symlink I am not too sure about this. Ok what I did modified this via update-alternatives --install /usr/bin/java java /usr/java/latest/bin/java 20000. Next I run both rpm -qf /usr/java/jdk1.7.0_03/bin/java and rpm -qf /usr/java/jdk1.7.0_03/bin/javac gave me jdk-1.7.0_03-fcs.x86_64 Commented May 22, 2013 at 17:09
  • Symlinks are symbolic links. If a file is a symlink, it simply points to another file, saying "That's me over there." Do an "ls -la" on /usr/bin/java and /usr/bin/javac. If they look like one file pointing to another, it's a symlink. Follow the chain with further "ls -la"s until you come to the end. Then run "rpm -qf" against the end path. Commented May 22, 2013 at 17:13

1 Answer 1

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1

The alternatives system doesn't always work correctly with third party packages like the Java packages you're installing. You need to either use the CentOS packaged java or create the symlinks yourself without using the alternatives system/command to ensure all links are correct.

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5
  • But surprisingly this is the same command I have been using for all my other centos machine and it works. So how to create those symlinks as I have been using alternative all this while. Commented May 22, 2013 at 18:09
  • Learn the "ln" command. Commented May 22, 2013 at 18:10
  • Will it be right if I just cp from /usr/java/jdk1.7.0_03/bin/javac into /usr/bin/javac ? Why do need the links? Commented May 22, 2013 at 18:13
  • I did this ln -s /usr/java/latest/bin/javac /usr/bin/javac ln: creating symbolic link `/usr/bin/javac': File exists Commented May 22, 2013 at 18:15
  • any help on how to resolve this issue now? Commented May 23, 2013 at 16:09

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