Gurobi package name changed from `gurobi` to `com.gurobi.gurobi` in new version and cause package not found error in COMETS

[gaospecial]

I found when using COMETS with gurobi 11.0.2, there is a error cause by Gurobi.

The original error in cometspy is as follows:

RuntimeError: COMETS simulation did not complete:JAVA could not find gurobi.
try the following:
>>> import os
>>> os.environ['GUROBI_COMETS_HOME']
if there is nothing there try setting that variable
to the location of gurobi.jar, for example:
>>> os.environ['GUROBI_COMETS_HOME'] = '/opt/gurobi900/inux64'

After investigation, I identified it is a java class definition not found error raised by COMETS.

Exception in thread "main" java.lang.NoClassDefFoundError: gurobi/GRBException
        at edu.bu.segrelab.comets.fba.FBAModel.(FBAModel.java:224)
        at edu.bu.segrelab.comets.fba.FBAModel.(FBAModel.java:287)
        at edu.bu.segrelab.comets.fba.FBAModel.loadModelFromFile(FBAModel.java:2648)
        at edu.bu.segrelab.comets.fba.FBACometsLoader.loadModelFromFile(FBACometsLoader.java:2918)
        at edu.bu.segrelab.comets.fba.FBACometsLoader.parseModelFileLine(FBACometsLoader.java:1168)
        at edu.bu.segrelab.comets.fba.FBACometsLoader.loadLayoutFile(FBACometsLoader.java:316)
        at edu.bu.segrelab.comets.Comets.loadLayoutFile(Comets.java:1657)
        at edu.bu.segrelab.comets.Comets.runScript(Comets.java:541)
        at edu.bu.segrelab.comets.Comets.(Comets.java:233)
        at edu.bu.segrelab.comets.Comets.main(Comets.java:2159)

In of source of COMETS, the format used to import is no longer work in new version of gurobi.

import gurobi.GRBConstr;
import gurobi.GRBEnv;
import gurobi.GRBException;
import gurobi.GRBLinExpr;
import gurobi.GRBModel;
import gurobi.GRBVar;
import gurobi.GRB.DoubleAttr;
import gurobi.GRB.IntAttr;
import gurobi.GRB.IntParam;
import gurobi.GRB.StringAttr;

I believed these lines should be updated to the latter format.

import com.gurobi.gurobi.GRB

Or, (to users) using gurobi v10.0.0 can work with current release of COMETS.

Hope this could be help.

[dukovski]

Thank you for the information. Yes, gurobi changed the import, and this is how it works now.