Adding garbage collection before each goniometer scan step

src/main/java/Goniometer.java

@@ -251,7 +251,7 @@ horizontal axis:
 		}
 		startAxial=startStep-this.lastScanStep;
 		this.lastScanStep=startStep-1;
-		
+		 Runtime runtime = Runtime.getRuntime();
 		for (int nTilt=startTilt;nTilt<numTiltSteps;nTilt++){
 			double tilt=tilts[nTilt];
 			tilt=0.1*Math.round(10*tilt); // is that needed?
@@ -262,7 +262,7 @@ horizontal axis:
 			if (this.debugLevel>0) System.out.println(status);
 			if (updateStatus) IJ.showStatus(status);
 			this.goniometerParameters.motorsSimultaneous=false; // not yet implemented
-//			if (!this.goniometerParameters.motorsSimultaneous){
+			//			if (!this.goniometerParameters.motorsSimultaneous){
 			OK= this.goniometerParameters.goniometerMotors.moveMotorSetETA(tiltMotor, tiltMotorPosition);
 			if (!OK) {
 				String msg="Could not set motor "+(tiltMotor+1)+" to move to "+tiltMotorPosition+" - may be out of limit";
@@ -277,7 +277,7 @@ horizontal axis:
 				IJ.showMessage("Error",msg);
 				return false;
 			}
-//			}
+			//			}
 			for (int nAxial=((nTilt==startTilt)?startAxial:0);nAxial<rots[nTilt].length;nAxial++){
 				double axial=rots[nTilt][nAxial];
 				axial=0.1*Math.round(10*axial);
@@ -285,7 +285,9 @@ horizontal axis:
 				status=(this.lastScanStep+1)+"( last="+(numStops-1)+") "+IJ.d2s(1E-9*(System.nanoTime()-startTime),3)+" sec.  tilt:"+(nTilt+1)+"/"+numTiltSteps+" , "+
 						IJ.d2s(tilt,2)+" deg., axial:"+
 						(nAxial+1)+"/"+rots[nTilt].length+" , "+IJ.d2s(axial,2)+" deg.";
-				if (this.debugLevel>0) System.out.println(status+", axial motor steps: "+axialMotorPosition);
+				runtime.gc();
+				String memoryStatus="Free memory="+runtime.freeMemory()+" (of "+runtime.totalMemory()+")";
+				if (this.debugLevel>0) System.out.println(status+", axial motor steps: "+axialMotorPosition+" "+memoryStatus);
 				if (updateStatus) IJ.showStatus(status);
 
 				OK= this.goniometerParameters.goniometerMotors.moveMotorSetETA(axialMotor, axialMotorPosition);
@@ -302,8 +304,8 @@ horizontal axis:
 					IJ.showMessage("Error",msg);
 					return false;
 				}
-// update motor positions in the image properties, acquire and save images.
-// TODO: Make acquisition/decoding/laser identification multi-threaded				
+				// update motor positions in the image properties, acquire and save images.
+				// TODO: Make acquisition/decoding/laser identification multi-threaded				
 				this.cameras.setMotorsPosition(this.goniometerParameters.goniometerMotors.getTargetPositions()); // Used target, not current to prevent minor variations
 				this.cameras.reportTiming=debugTiming;