Question Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux in Additional Q&A

Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Fri, 12 Feb 2010 13:02:55 GMT

Hi gurus,

I´m trying to install an ECC 6.0 SR3 (ABAP) on RHEL v.5 with Oracle DB.

But as I am newbie I have some doubts, in this point is with the Java Version JRE that is required in sap installion process.

I already installed the JRE through RPM Package File (I followed the instructions/steps described in this url - http://java.sun.com/j2se/1.4.2/jre/install-linux.html ) and I don´t have any problem... by the way I installed the JRE version 1.4.2_25 b02.

But after the installation I had a question, how do I check if the package was installed correctly? I insert the commad java -version, and the result was this:

java version "1.4.2"

gij (GNU libgcj) version 4.1.2 20080704 (Red Hat 4.1.2-46)

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

With this information I really do not know if the version 25 was installed...

I already check if there is some directory with the new file, and actually there exist in the directory /usr/java but this is not tell me if this is the new one!!

It´s possible to know which one is installed with other command by terminal?

Best regards,

Joao Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Fri, 12 Feb 2010 13:08:03 GMT

Hello João,

SAP Note 1172419 tells you what Java version you need.

Matthias

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Fri, 12 Feb 2010 14:45:24 GMT

Hello Matthias,

I didn´t ask what release I should install in my RHEL!! Because I already install the JRE version 1.4.2_25 b02.

What I asked was if there is any other command as java -version that give me the information what version is installed, to make sure that the installation was done properly.

For example in windows platforms when I run the command java -version the result give us all information about which release with detail, is install on that server! Like this (example):

java version "1.6.0_17"

Java(TM) SE Runtime Environment (build 1.6.0_17-b04)

Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)

However in Linux platform it only show this information:

java version "1.4.2"

gij (GNU libgcj) version 4.1.2 20080704 (Red Hat 4.1.2-46)

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

I really do not know if the version 25 was installed

As you can see above isn´t display any kind of information of release that is installed (only said "1.4.2") on Linux Red Hat server and therefore I really don´t know what version is installed in this server, could be an old one version that comes by default!

You already understand my question/doubt..?!

King regards,

João Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Fri, 12 Feb 2010 15:13:10 GMT

Hi João,

the command is

java -fullversion

Matthias

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

former_member524429 — Fri, 12 Feb 2010 15:34:58 GMT

Hi,

IBM JDK 1.4.2 is recommended for SAP Installation on Linux.

Please refer this SAP Note 1090932 - IBM download site for special JDK builds - iFix.

(IBMJava2-AMD64-142-SDK-1.4.2-13.0.x86_64.rpm)

Regards,

Bhavik G. Shroff

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Fri, 12 Feb 2010 15:38:07 GMT

Hello Matthias,

That command don´t give me what I want... the only result is this:

java full version "gcj - 1.4.2"

This will mean that the installation that I did (JRE version 1.4.2_25 b02) was not successful??

But a some momments ago I checked the Package Manager and there I see the package with the version that I installed (1.4.2_25 b02), as you can see in following images:

http://img715.imageshack.us/img715/5631/javajrepackagemanager.png

Through terminal with command "yum list | grep installed | more":

http://img715.imageshack.us/img715/6003/javaversion.png

I don´t know... I think that is installed!! What do you think?

Kind regards,

João Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

hannes_kuehnemund — Fri, 12 Feb 2010 15:47:40 GMT

Dear João Dimas,

this does mean, that the java you installed is not in the $PATH variable. Only what is available within the $PATH variable will be found when calling binaries without full path information. Maybe on windows the $PATH variable was changes during installation, on Linux it isn't. On Linux you have to set the variable yourself. I also assume that /etc/alternatives/java points to the gcj ...

Hannes

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Fri, 12 Feb 2010 16:11:59 GMT

Hello Hannes,

Yeah you´re right but in windows platforms after the installation of JRE is always necessary to define the variable system where the path for this binary is and this in that variable system $PATH... and other thing that is always necessary when database is oracle, is define a user variable with name JAVA_HOME!!

But on Linux platform I don´t know how can I do that... How can I define variables either system and user, if that is necessary, I think so...

Can you help me how can I indicate this path to that variables... how can I define them...?!

Thank you

Best regards,

João Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

former_member524429 — Fri, 12 Feb 2010 16:43:24 GMT

Hi,

export <VARIABLE>

SET <VARIABLE>=<string>

Depends on the used Shell, you can set the required Environment variable in Linux/Unix.

e.g.

PATH=$PATH:<path to JDK installation/bin>

EXPORT PATH

JAVA_HOME=<path to Jdk>

EXPORT JAVA_HOME

You can set the required parameters permanently in Linux/Unix , by adding them into the start-up scripts/files such as (~/ .bashrc) or ( ~/ .cshrc file),

Regards,

Bhavik G. Shroff

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Fri, 12 Feb 2010 17:27:41 GMT

Hello Bhavik,

But tell me one thing, it is even necessary create this two variables like I always made in windows platform?

I ask this because I don´t see this in installation guide...!!!

This action is mandatory?!

Best regards,

João Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

markus_doehr2 — Fri, 12 Feb 2010 23:13:02 GMT

You only have to use the during installation time so that sapinst will find the correct one. sapinst makes sure, they are added automatically to the <sid>adm user; so simply do a

export JAVA_HOME=<PATH_TO_JAVA_HOME>
export PATH=$JAVA_HOME/bin:$PATH

Then start sapinst in the same shell window you entered those variables.

Markus

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Sun, 14 Feb 2010 17:31:27 GMT

Hello Markus Doehr,

But tell me one thing before I do anything, it is required to create these variables, like I always made in windows platform?

I ask this because I don´t see this in installation guide...!!!

This action is mandatory?

Thank you

Kind regards,

João Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

markus_doehr2 — Sun, 14 Feb 2010 17:41:10 GMT

> But tell me one thing before I do anything, it is required to create these variables, like I always made in windows platform?

Did you actually read my last reply?

I repeat it again:

You only have to use the during installation time so that sapinst will find the correct one. sapinst makes sure, they are added automatically to the <sid>adm user;

Markus

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Tue, 16 Feb 2010 21:25:20 GMT

Hello Markus,

Sorry for my previous question... that helped me, thanks!

But now I´m faccing with another problem when I tried to start the SAPInst by the command ./sapinst and then showed me the message that I do not have permissions "Permission denied"... but I´m logged with root user!

You can see this error in the following image:

http://img121.imageshack.us/img121/2388/permissiondenied.jpg

How can I solve this problem?

Best regards,

João Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

markus_doehr2 — Tue, 16 Feb 2010 22:48:52 GMT

But now I´m faccing with another problem when I tried to start the SAPInst by the command ./sapinst and then showed me the message that I do not have permissions "Permission denied"... but I´m logged with root user!

Why do you use screenshots? I'd just paste the text here - much easier to search if someone has likewise problems

sapinst has no execute permission.

Execute

chmod u+x sapinst

then try again.

Markus

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Wed, 17 Feb 2010 01:35:34 GMT

Hi Markus,

Thank you for your last answer it helped me, your´re right regarding to my screenshots.. sorry!

So... But when sapinst started an error occurred (besides a new window - SAPinst GUI - open with same error):

[root@redhatsap IM_LINUX_X86_64]# ./sapinst
[==============================]  extracting...  done!

Starting GuiServer using:
/usr/java/j2sdk1.4.2_25/bin/java -Xmx256M -Djava.security.egd=file:/dev/urandom
 -cp /tmp/sapinst_exe.469.1266363842/JAR/instgui.jar:/tmp/sapinst_exe.469.1266
363842/JAR/inqmyxml.jar SDTServer config=jar:sdtserver.xml guiport=21212 
sapinsthost=localhost sapinstport=21200 guistart=true

init: retrieving account information for group sapinst...
init: retrieving account information done.
load resource pool /root/Desktop/sap/51033511_8_BS_2005_SR3_SAP_Installation
_Master/IM_LINUX_X86_64/resourcepool.xml

guiengine: No GUI server connected; waiting for a connection on host redhatsap, 
port 21200 to continue with the installation

So I have two questions:

1 - How do I set this port to this service, to resolve this situation?

2 - How and where can I see how much swap I have on Linux? (This server have 4Gb of RAM)

Best regards,

João Dimas - Portugal

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

markus_doehr2 — Wed, 17 Feb 2010 01:45:57 GMT

> [root@redhatsap IM_LINUX_X86_64]# ./sapinst

> [==============================] \ extracting... done!

> Starting GuiServer using:

> /usr/java/j2sdk1.4.2_25/bin/java -Xmx256M

You are using the wrong JDK.

Since you're on 64bit you need to use a 64bit JDK. Sun has no 64bit 1.4.2 JDK for Linux so you need to download the IBM JDK.

This is described in the installation guide chapter "3.9 Installing the Java Runtime Environment" and

Note 861215 - Recommended Settings for the Linux on AMD64/EM64T JVM

> 1 - How do I set this port to this service, to resolve this situation?

Which port to set where?

Chapter 4.3.1 Running SAPinst on UNIX

> 2 - How and where can I see how much swap I have on Linux? (This server have 4Gb of RAM)

Installation guide, chapter 3.2.7 Setting up Swap Space for Linux

No offense, I'm willing to help - but did you actually have a look at the installation guide?

Markus

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

former_member524429 — Wed, 17 Feb 2010 04:50:43 GMT

Hi,

As I said in my earlier post, IBM JDK 1.4.2 is recommended for SAP Installation on Linux.

Please refer this [SAP Note 1090932 - IBM download site for special JDK builds - iFix|https://service.sap.com/sap/support/notes/1090932].

e.g.

(IBMJava2-AMD64-142-SDK-1.4.2-13.0.x86_64.rpm)

And set the required JAVA_HOME and $PATH variable as suggested in earlier posts.

It will be good if you follow the concerned Official SAP Installation guides, where all required things are narrated step by step with proper understanding.

Regards,

Bhavik G. Shroff

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

markus_doehr2 — Wed, 17 Feb 2010 08:41:10 GMT

Bhavik,

can you please tell me why you (very often) repeat what I wrote just in different words?

Markus

Re: Installation the Java Runtime Environment (JRE) on Red Hat Enterprise Linux

Former Member — Wed, 17 Feb 2010 11:25:26 GMT

Hello Markus,

First at all, off course... Yes, I am reading step by step the installation guide (I´m in chapter "4. Installation")

1- Ok Markus, but for me it is strange how I could know that the JDK was wrong, that because I don´t know why I have to install this component for IBM JDK ...... This server has a x86_64 bit architecture, where is related to IBM? I did not understood that sorry... and the component that is installed is 1.4.2 JDK with last version which is 25 to x64 bit (for my x86_64 architecture) ... Forgive my ignorance here, but I don´t understand Markus! Where there is a relationship with the AMD64 architecture? If you are correct... if this is a AMD64 therefore I have to download new installation media DVD´s for this installation for AMD64 architecture, isn´t it? Because all the dvd's that I have here to install this system is refer to the version x86_64!

2- Regarding SWAP question... I had read this chapter "3.2.7 Setting up Swap Space for Linux" in the installation guide and it just says there is how I see how much swap is set in the operating system, with the command swapon-s, when I type this command it show me this:

[root@redhatsap IM_LINUX_X86_64]# swapon -s
Filename                                Type            Size    Used    Priority
/dev/mapper/VolGroup01-LogVol01         partition       5931000 0       -1

This means that I have about 5,9 Gb of RAM memory?

If I need to allocate more memory, as sap recommends 2xRAM, with 8 GB of RAM, how can I do that, in installation guide it tell me to go read the manual for linux... what documentation?!

"2. If required, configure swap space as follows:

On Red Hat Linux:

Check the documentation provided by Red Hat."

Many appologies for my confusions.. Markus!

Best regards,

João Dimas - Portugal