fix: updates to support for Gurobi 12

README.md

@@ -28,7 +28,7 @@ This program comes with ABSOLUTELY NO WARRANTY. This is free software, and you a
 3. Available solvers:
   * Open source [LpSolve](http://sourceforge.net/projects/lpsolve/) can be used for LP and MIP.
   * Open source [oJSolver](http://ojalgo.org/) can be used for LP, QP and MIP.
-  * Proprietary solver [Gurobi 9](http://www.gurobi.com/) can be used for efficiently solving LP, QP, QCQP and MIP.
+  * Proprietary solver [Gurobi 12](http://www.gurobi.com/) can be used for efficiently solving LP, QP, QCQP and MIP.
   * Proprietary solver [Mosek 9](https://www.mosek.com/) can be used for efficiently solving LP, QP, QCQP and MIP.
 
 ## How to get Optimus

build.sbt

@@ -40,19 +40,11 @@ lazy val lpsolve = Project("solver-lp", file("solver-lp"))
   .settings(libraryDependencies += Dependencies.LpSolve)
 
 // Build settings for Optimus gurobi solver
-lazy val gurobi =
-  if (file("lib/gurobi.jar").exists) Project("solver-gurobi", file("solver-gurobi"))
-    .dependsOn(core % "compile->compile ; test->test")
-    .enablePlugins(AutomateHeaderPlugin)
-    .settings(name := "optimus-solver-gurobi")
-    .settings(Compile / unmanagedJars += file("lib/gurobi.jar"))
-  else Project("solver-gurobi", file("solver-gurobi"))
-    .settings {
-      logger.warn {
-        "Building in the absence of support for the Gurobi solver [ 'gurobi.jar' not found in 'lib' directory ]."
-      }
-      Seq(name := "optimus-solver-gurobi", publish := {}, publishLocal := {})
-    }
+lazy val gurobi = Project("solver-gurobi", file("solver-gurobi"))
+  .dependsOn(core % "compile->compile ; test->test")
+  .enablePlugins(AutomateHeaderPlugin)
+  .settings(name := "optimus-solver-gurobi")
+  .settings(libraryDependencies += Dependencies.Gurobi)
 
 // Build settings for Optimus mosek solver
 lazy val mosek =

project/Dependencies.scala

@@ -27,6 +27,7 @@ object Dependencies {
     final val ScalaTestPlus = "3.2.11.0"
 
     final val LpSolve = "5.5.2.0"
+    final val Gurobi = "12.0.0"
     final val ojAlgorithms = "51.4.0"
     final val Trove = "3.1.0"
     final val ScalaXML = "2.3.0"
@@ -56,4 +57,7 @@ object Dependencies {
 
   // oj! Algorithms library for linear and quadratic programming
   lazy val ojAlgorithms: ModuleID = "org.ojalgo" % "ojalgo" % v.ojAlgorithms
+
+  // Gurobi library for mathematical programming
+  lazy val Gurobi: ModuleID = "com.gurobi" % "gurobi" % v.Gurobi
 }

solver-gurobi/src/main/scala/optimus/optimization/Gurobi.scala

@@ -16,7 +16,7 @@
 
 package optimus.optimization
 
-import gurobi._
+import com.gurobi.gurobi._
 import optimus.algebra._
 import optimus.optimization.enums.PreSolve._
 import optimus.optimization.enums.{ PreSolve, SolutionStatus }