[Gmat-users] Java Examples

[Manolis Papanagiotou]

Good evening!

Thank you for GMAT and the awesome work that you guys are doing 🙏

I am an astrodynamicist working with Saber Astronautics. I am interested in
using GMAT programmatically as part of a containerized Java Spring Boot
application.

The GMAT API User Guide provides a few Java examples, but I have a few
questions on how to set them up properly, specifically related to the
loading of auxiliary data (e.g. eop file), but also on some missing members
from the examples. There seems to be an abundance of Python and MATLAB
examples, but not as much for Java.

1. On Windows, I have successfully managed to add the three jars to my
build path, and configure my PATH such that the GMAT bin folder is added.
In my code, I load the library by typing:

System.load("C:\\Apps\\gmat-win-R2022a\\GMAT\\bin\\gmat_java.dll");

Then, I am able to run the following piece of code:

TimeSystemConverter timeConverter = TimeSystemConverter.Instance();


timeConverter.SetLeapSecsFileReader(new LeapSecsFileReader());


double UTCepoch = 39000.000001;

double TAIepoch = timeConverter.Convert(UTCepoch, TimeSystemConverter.UTC,
TimeSystemConverter.TAI);

However, the Java examples suggest using the member

TimeSystemConverter timeConverter = gmat.theTimeSystemConverter;

Am I loading the UTC-TAI file properly? Am I loading the dll library
correctly? In the other Java examples, I cannot run gmat.Initialize()
without crashing the JVM, and I find that I have to frequently cast
all calls to gmat.Construct(). I feel I am using the Java API the
wrong way. Is there a sample Java project that could get me started?


Thank you once again in advance!

Manny

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