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

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

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
>
>

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

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
>
>