Applications/Java
From HPC
Contents
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
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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