what java version to install for Linux

Hello guys,

I'm getting a message on jchem manager telling me that my java version is not supported, I tried to dowload and setup the last java JDK version Java SE Development Kit 7u21 " jdk-7u21-linux-x64.rpm package" but always showing me the same message "Unsupported java VM type: openJDK 64 bits version"

This is my linux information: Linux version 2.6.39-400.21.1.el6uek.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #1 SMP Thu Apr 4 03:49:00 PDT 2013

Hi Idris,

You have to make sure that the Oracle Java is the default not the openJDK.

You can control this via the PATH variable, the bin directory of the Oracle Java should be put into front.

You can check the currently executed Java by :

which java

Also:

java -version

Best regards,

Szilard

Yes everything is perfect, please what do you mean by "into front"? 

this is my /etc/profile settings: 

ORACLE_BASE=/usr/oracle

ORACLE_HOME=$ORACLE_BASE/product/11.2.0.3

CATALINA_HOME=/usr/share/tomcat6

JCHEM_HOME=/usr/jchem

CHEMAXON_LICENSE_URL=/root/ChemAxon/license.cxl

#JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.19.x86_64

JAVA_HOME=/usr/java/jdk1.7.0_21/jre

ORACLE_SID=test

export JAVA_HOME ORACLE_BASE ORACLE_HOME ORACLE_SID CATALINA_HOME JCHEM_HOME CHEMAXON_LICENSE_URL

export PATH=$ORACLE_HOME/bin/:$CATALINA_HOME/bin:$JCHEM_HOME/bin:$JAVA_HOME/bin:$PATH

How do you start JChemManager exactly?

Which JChem version is this?

Peter

This is a copy from my console "the command and the output before the window comes out"
.jchem]# ./JChemManager 

testing JVM in /usr/java/jdk1.7.0_21 ...

Does it make any difference, if you start JChemManager using jcman:

$ jcman

?

Peter

$ jcman

With the "jcman" command, the same message, this is a screenshot

Please, could you execute the following command and post the resulting log file?

>log; $JAVA_HOME/bin/java -version >>log 2>&1; java -version >>log 2>&1; ./jcman -h >>log 2>&1

Thanks,

Peter

>log; $JAVA_HOME/bin/java -version >>log 2>&1; java -version >>log 2>&1; ./jcman -h >>log 2>&1

java version "1.7.0_21"

Java(TM) SE Runtime Environment (build 1.7.0_21-b11)

Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)

java version "1.7.0_21"

Java(TM) SE Runtime Environment (build 1.7.0_21-b11)

Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)

bash: ./jcman: Aucun fichier ou dossier de ce type

Hi Idris!

I could reproduce your problem if I installed JChem with an OpenJDK. In this case the java version is written to ChemAxon/JChem/bin/java.ini, and it does not matter if you install an Oracle java later, the java version used by JChemManager and jcman is always read from this file.

And you have several options to correct this. But first check your java.ini file, whether it really contains a path to an openjdk java. If this is true then you can reinstall JChem from a shell where an Oracle java is the default. In this case everything is set up automatically. But if you do not want to reinstall it, you can edit the contents of your java.ini file and replace the path with a path to an Oracle JRE folder. For example:

[Java Runtime Environment]
Java Path=/opt/jre17/

The trailing "/" character is important!
I hope this will solve the problem in your case also.

Best Regards,

  Akos