Why there are duplicated binaries in openjdk?

[Athenas Jimenez]

Hi,

I'm kind of new in java, so probably my question is too obvious. The other
day looking into /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.fc21.x86_64
in my Fedora, I notice some duplicated binaries like bin/java and
jre/bin/java.

I read about the difference between JRE and JDK, but I don't get why is
necessary to keep both binaries if we only use one of them.

Hope you can help me to understand a little more.

Thanks a lot.
Athenas

[Deepak Bhole]

* Athenas Jimenez <athenasjim(a)gmail.com&gt; [2015-11-16 10:44]:
>  Hi, 
>  
>  I'm kind of new in java, so probably my question is too obvious. The other day
>  looking into /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.fc21.x86_64 in my
>  Fedora, I notice some duplicated binaries like bin/java and jre/bin/java.
>  
>  I read about the difference between JRE and JDK, but I don't get why is
>  necessary to keep both binaries if we only use one of them. 
>  
>  Hope you can help me to understand a little more.
>   
We mimic how upstream lays out files (including dupes). As for why there
are duplicate files in the first place -- I am not sure, it may be due
to historical reasons when the files in the JDK (bin/) differed from the
files in the JRE (jre/bin/). The docs don't shed much light on it other
than saying that they are identical:
https://docs.oracle.com/javase/8/docs/technotes/tools/windows/jdkfiles.html

Above link is for Windows but the layout stands for Linux as well.

Deepak

>  Thanks a lot.
>  Athenas 
>  --
>  java-devel mailing list
>  java-devel(a)lists.fedoraproject.org
>  https://admin.fedoraproject.org/mailman/listinfo/java-devel

[Athenas Jimenez]

Hi Deepak,

After reading the documentation, I understand a little more.

Thanks a lot for your answer :)
Athenas

On Mon, Nov 16, 2015 at 10:23 AM, Deepak Bhole <dbhole(a)redhat.com&gt; wrote:

>  * Athenas Jimenez <athenasjim(a)gmail.com&gt; [2015-11-16 10:44]:
>  > Hi,
>  >
>  > I'm kind of new in java, so probably my question is too obvious. The
>  other day
>  > looking into /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.fc21.x86_64
>  in my
>  > Fedora, I notice some duplicated binaries like bin/java and jre/bin/java.
>  >
>  > I read about the difference between JRE and JDK, but I don't get why is
>  > necessary to keep both binaries if we only use one of them.
>  >
>  > Hope you can help me to understand a little more.
>  >
>
>  We mimic how upstream lays out files (including dupes). As for why there
>  are duplicate files in the first place -- I am not sure, it may be due
>  to historical reasons when the files in the JDK (bin/) differed from the
>  files in the JRE (jre/bin/). The docs don't shed much light on it other
>  than saying that they are identical:
>  https://docs.oracle.com/javase/8/docs/technotes/tools/windows/jdkfiles.html
>
>  Above link is for Windows but the layout stands for Linux as well.
>
>  Deepak
>
>  > Thanks a lot.
>  > Athenas
>
>  > --
>  > java-devel mailing list
>  > java-devel(a)lists.fedoraproject.org
>  > https://admin.fedoraproject.org/mailman/listinfo/java-devel
>
>