Hi,

I am planning to use Ubuntu 12.04, from http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK

"Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so OpenJDK cannot be used to compile hadoop mapreduce code in branch-0.23 and beyond, please use other JDKs."

Is it OK to use OpenJDK 7 in Ubuntu 12.04?

Thanks

AFAIK, openjdk can be used to run hadoop. Why do you want to build hadoop
from source? Get precompiled binaries and you will be ok.

Also, you can install sun/oracle jdk on ubuntu. Just google for
instructions, u will find plenty, like here -
http://www.ubuntututorials.com/install-oracle-java-jdk-7-ubuntu-12-04/.
These are for jdk 7, but you can follow the same to install jdk 6.

Enjoy!
On Nov 8, 2012 11:30 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:

> Hi,
>
> I am planning to use Ubuntu 12.04, from
> http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK
>
> "Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so
> OpenJDK cannot be used to compile hadoop mapreduce code in branch-0.23 and
> beyond, please use other JDKs."
>
> Is it OK to use OpenJDK 7 in Ubuntu 12.04?
>
> Thanks
>
>

Hi Sanjeev,

Unfortunately, official Ubuntu repositories no longer supports Oracle
JDK/JRE 6. See https://help.ubuntu.com/community/Java#Oracle_.28Sun.29_Java_6

On Thu, Nov 8, 2012 at 11:47 AM, Sanjeev Verma
<[EMAIL PROTECTED]> wrote:
> AFAIK, openjdk can be used to run hadoop. Why do you want to build hadoop
> from source? Get precompiled binaries and you will be ok.
>
> Also, you can install sun/oracle jdk on ubuntu. Just google for
> instructions, u will find plenty, like here -
> http://www.ubuntututorials.com/install-oracle-java-jdk-7-ubuntu-12-04/.
> These are for jdk 7, but you can follow the same to install jdk 6.
>
> Enjoy!
>
> On Nov 8, 2012 11:30 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
>>
>> Hi,
>>
>> I am planning to use Ubuntu 12.04, from
>> http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK
>>
>> "Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so
>> OpenJDK cannot be used to compile hadoop mapreduce code in branch-0.23 and
>> beyond, please use other JDKs."
>>
>> Is it OK to use OpenJDK 7 in Ubuntu 12.04?
>>
>> Thanks
>>
>

--
Harsh J

Thanks Harsh,

This is exactly what I am facing, I have used Ubuntu for long time, 12.04 is the Long Term Support version (LTS),  however Oracle JDK/JRE6  is no longer supported in it,  "OpenJDK has sometimes a odd behavior - Alexander Lorenz'".  Any Ubuntu 12.04 users here to share your selections/options?

Thanks
On 8 Nov 2012, at 4:37 PM, Harsh J wrote:

> Hi Sanjeev,
>
> Unfortunately, official Ubuntu repositories no longer supports Oracle
> JDK/JRE 6. See https://help.ubuntu.com/community/Java#Oracle_.28Sun.29_Java_6
>
> On Thu, Nov 8, 2012 at 11:47 AM, Sanjeev Verma
> <[EMAIL PROTECTED]> wrote:
>> AFAIK, openjdk can be used to run hadoop. Why do you want to build hadoop
>> from source? Get precompiled binaries and you will be ok.
>>
>> Also, you can install sun/oracle jdk on ubuntu. Just google for
>> instructions, u will find plenty, like here -
>> http://www.ubuntututorials.com/install-oracle-java-jdk-7-ubuntu-12-04/.
>> These are for jdk 7, but you can follow the same to install jdk 6.
>>
>> Enjoy!
>>
>> On Nov 8, 2012 11:30 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
>>>
>>> Hi,
>>>
>>> I am planning to use Ubuntu 12.04, from
>>> http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK
>>>
>>> "Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so
>>> OpenJDK cannot be used to compile hadoop mapreduce code in branch-0.23 and
>>> beyond, please use other JDKs."
>>>
>>> Is it OK to use OpenJDK 7 in Ubuntu 12.04?
>>>
>>> Thanks
>>>
>>
>
>
>
> --
> Harsh J

Hi there,

    As per my understanding, all the code has been built and tested against
java6(sun). There are some changes between java7 and 6 and you may face
issues while running your code, like using sort with collections. I faced
the same thing when using List.sort in my code. So, it's better to go with
sun's java6. If you want to install it you can follow these steps :

1. Download the zipped file and extract it.

2. chmod +x jdk-6u37-linux-x64.bin

3. ./jdk-6u37-linux-x64.bin

4. sudo mv jdk1.6.0_37/ /usr/lib/jvm/

5. sudo update-alternatives --install /usr/bin/javac javac
/usr/lib/jvm/jdk1.6.0_37/bin/javac 1

6. sudo update-alternatives --install /usr/bin/java java
/usr/lib/jvm/jdk1.6.0_37/bin/java 1

7. sudo update-alternatives --install /usr/bin/javaws javaws
/usr/lib/jvm/jdk1.6.0_37/bin/javaws 1

Then choose which java to use :

sudo update-alternatives --config java

choose the no for java6

Regards,
    Mohammad Tariq

On Thu, Nov 8, 2012 at 2:29 PM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:

> Thanks Harsh,
>
> This is exactly what I am facing, I have used Ubuntu for long time, 12.04
> is the Long Term Support version (LTS),  however Oracle JDK/JRE6  is no
> longer supported in it,  "OpenJDK has sometimes a odd behavior - Alexander
> Lorenz'".  Any Ubuntu 12.04 users here to share your selections/options?
>
> Thanks
>
>
> On 8 Nov 2012, at 4:37 PM, Harsh J wrote:
>
> > Hi Sanjeev,
> >
> > Unfortunately, official Ubuntu repositories no longer supports Oracle
> > JDK/JRE 6. See
> https://help.ubuntu.com/community/Java#Oracle_.28Sun.29_Java_6
> >
> > On Thu, Nov 8, 2012 at 11:47 AM, Sanjeev Verma
> > <[EMAIL PROTECTED]> wrote:
> >> AFAIK, openjdk can be used to run hadoop. Why do you want to build
> hadoop
> >> from source? Get precompiled binaries and you will be ok.
> >>
> >> Also, you can install sun/oracle jdk on ubuntu. Just google for
> >> instructions, u will find plenty, like here -
> >> http://www.ubuntututorials.com/install-oracle-java-jdk-7-ubuntu-12-04/.
> >> These are for jdk 7, but you can follow the same to install jdk 6.
> >>
> >> Enjoy!
> >>
> >> On Nov 8, 2012 11:30 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> >>>
> >>> Hi,
> >>>
> >>> I am planning to use Ubuntu 12.04, from
> >>> http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK
> >>>
> >>> "Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so
> >>> OpenJDK cannot be used to compile hadoop mapreduce code in branch-0.23
> and
> >>> beyond, please use other JDKs."
> >>>
> >>> Is it OK to use OpenJDK 7 in Ubuntu 12.04?
> >>>
> >>> Thanks
> >>>
> >>
> >
> >
> >
> > --
> > Harsh J
>
>

Hi, thank you for your info and will head for it. Thanks.
On 8 Nov 2012, at 6:07 PM, Mohammad Tariq wrote:

> Hi there,
>
>     As per my understanding, all the code has been built and tested against java6(sun). There are some changes between java7 and 6 and you may face issues while running your code, like using sort with collections. I faced the same thing when using List.sort in my code. So, it's better to go with sun's java6. If you want to install it you can follow these steps :
>
> 1. Download the zipped file and extract it.
>
> 2. chmod +x jdk-6u37-linux-x64.bin
>
> 3. ./jdk-6u37-linux-x64.bin
>
> 4. sudo mv jdk1.6.0_37/ /usr/lib/jvm/
>
> 5. sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.6.0_37/bin/javac 1
>
> 6. sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.6.0_37/bin/java 1
>
> 7. sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.6.0_37/bin/javaws 1
>
> Then choose which java to use :
>
> sudo update-alternatives --config java
>
> choose the no for java6
>
> Regards,
>     Mohammad Tariq
>
>
>
> On Thu, Nov 8, 2012 at 2:29 PM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Thanks Harsh,
>
> This is exactly what I am facing, I have used Ubuntu for long time, 12.04 is the Long Term Support version (LTS),  however Oracle JDK/JRE6  is no longer supported in it,  "OpenJDK has sometimes a odd behavior - Alexander Lorenz'".  Any Ubuntu 12.04 users here to share your selections/options?
>
> Thanks
>
>
> On 8 Nov 2012, at 4:37 PM, Harsh J wrote:
>
> > Hi Sanjeev,
> >
> > Unfortunately, official Ubuntu repositories no longer supports Oracle
> > JDK/JRE 6. See https://help.ubuntu.com/community/Java#Oracle_.28Sun.29_Java_6
> >
> > On Thu, Nov 8, 2012 at 11:47 AM, Sanjeev Verma
> > <[EMAIL PROTECTED]> wrote:
> >> AFAIK, openjdk can be used to run hadoop. Why do you want to build hadoop
> >> from source? Get precompiled binaries and you will be ok.
> >>
> >> Also, you can install sun/oracle jdk on ubuntu. Just google for
> >> instructions, u will find plenty, like here -
> >> http://www.ubuntututorials.com/install-oracle-java-jdk-7-ubuntu-12-04/.
> >> These are for jdk 7, but you can follow the same to install jdk 6.
> >>
> >> Enjoy!
> >>
> >> On Nov 8, 2012 11:30 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> >>>
> >>> Hi,
> >>>
> >>> I am planning to use Ubuntu 12.04, from
> >>> http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK
> >>>
> >>> "Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so
> >>> OpenJDK cannot be used to compile hadoop mapreduce code in branch-0.23 and
> >>> beyond, please use other JDKs."
> >>>
> >>> Is it OK to use OpenJDK 7 in Ubuntu 12.04?
> >>>
> >>> Thanks
> >>>
> >>
> >
> >
> >
> > --
> > Harsh J
>
>

Recommend JDK 1.6.3x, 1.7 has serval issues within NIO and I wouldn't use them in production, OpenJDK has sometimes a odd behavior and IBM's JDK - no.

cheers,
 Alex

On Nov 8, 2012, at 7:17 AM, Sanjeev Verma <[EMAIL PROTECTED]> wrote:

> AFAIK, openjdk can be used to run hadoop. Why do you want to build hadoop
> from source? Get precompiled binaries and you will be ok.
>
> Also, you can install sun/oracle jdk on ubuntu. Just google for
> instructions, u will find plenty, like here -
> http://www.ubuntututorials.com/install-oracle-java-jdk-7-ubuntu-12-04/.
> These are for jdk 7, but you can follow the same to install jdk 6.
>
> Enjoy!
> On Nov 8, 2012 11:30 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
>
>> Hi,
>>
>> I am planning to use Ubuntu 12.04, from
>> http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK
>>
>> "Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so
>> OpenJDK cannot be used to compile hadoop mapreduce code in branch-0.23 and
>> beyond, please use other JDKs."
>>
>> Is it OK to use OpenJDK 7 in Ubuntu 12.04?
>>
>> Thanks
>>
>>

--
Alexander Alten-Lorenz
http://mapredit.blogspot.com
German Hadoop LinkedIn Group: http://goo.gl/N8pCF

I don't think OpenJDK 7 has been as extensively tested as OpenJDK 6
for Hadoop. I'd recommend staying on 1.6-based JVMs if you have a prod
goal for this cluster, but otherwise, you could give OpenJDK 7 a try
and let us know.

On Thu, Nov 8, 2012 at 11:30 AM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I am planning to use Ubuntu 12.04, from
> http://wiki.apache.org/hadoop/HadoopJavaVersions, about OpenJDK
>
> "Note*: OpenJDK6 has some open bugs w.r.t handling of generics... so OpenJDK
> cannot be used to compile hadoop mapreduce code in branch-0.23 and beyond,
> please use other JDKs."
>
> Is it OK to use OpenJDK 7 in Ubuntu 12.04?
>
> Thanks
>

--
Harsh J