Applications/Java

Application Details

• Description: Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented,[14] and specifically designed to have as few implementation dependencies as possible. Only OpenJDK versions are available.
• Version: 6.5.14, 7.5.18 and 8.0.61
• Modules: openjdk/1.8.0_222-b10/gcc-8.2.0, openjdk/11.0.2/gcc-8.2.0, openjdk/openjdk-17.0.0_35
• Legacy Modules: java/jdk1.7.0_80 and java/jdk1.8.0_102 redirect to openjdk/1.8.0_222-b10/gcc-8.2.0
• Licence: Free, but owned by Oracle. Only OpenJDK versions are available and free and open source.

Usage Examples

Because Java is byte compiled and then run by a runtime program it requires the module to be loaded as well in a SLURM script. This is not the case with a standalone compiled program like from C/C++/Fortran source.

Interactive Session

Note: this example is done on a compute node, usually access would be achieved with the scheduler

[username@gpu01 ~]$ module add  java/jdk/1.8.0_102
[username@gpu01 ~]$ java myJAVA.javac

Batch Job

This is running the job through the scheduler SLURM by using the command sbatch myJOB.job

#!/bin/bash

#SBATCH -J openJava-single-node
#SBATCH -N 1
#SBATCH --ntasks-per-node 1
#SBATCH -o %N.%j.%a.out
#SBATCH -e %N.%j.%a.err
#SBATCH -p compute
#SBATCH --exclusive

echo $SLURM_JOB_NODELIST

module purge
module add java/jdk1.8.0_102

export I_MPI_DEBUG=5
export I_MPI_FABRICS=shm:tmi
export I_MPI_FALLBACK=no

java /home/user/CODE_SAMPLES/demoJAVA

Further Information

• Java Programming Support (Viper)
• https://www.java.com/en/

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