Cooler error message for GradientDescentAlgorithm.

src/eva2/gui/GenericObjectEditor.java

@@ -117,21 +117,11 @@ public class GenericObjectEditor implements PropertyEditor {
 	 */
 	public static ArrayList<String> getClassesFromClassPath(String className) { 
 		ArrayList<String> classes = new ArrayList<String>();
-		int dotIndex = className.lastIndexOf('.');
-		if (dotIndex <= 0) {
-			System.err.println("warning: " + className + " is not a package!");
-		} else {		
-			String pckg = className.substring(0, className.lastIndexOf('.'));
 		Class<?>[] clsArr;
-			try {
-				clsArr = ReflectPackage.getAssignableClassesInPackage(pckg, Class.forName(className), true, true);
-			} catch (ClassNotFoundException e) {
-				e.printStackTrace();
-				clsArr = null;
-			}
+		clsArr=ReflectPackage.getAssignableClasses(className, true, true);
 		if (clsArr == null) {
-				System.err.println("Warning: No configuration property found in: "
-						+EvAInfo.propertyFile + " "+"for "+className);
+			System.err.println("Warning: No assignable classes found in property file or on classpath: "
+					+EvAInfo.propertyFile + " for "+className);
 			classes.add(className);
 		} else {
 			for (Class<?> class1 : clsArr) {
@@ -161,7 +151,6 @@ public class GenericObjectEditor implements PropertyEditor {
 				}
 			}
 		}
-		}
 		return classes;
 	}
 	

src/eva2/server/go/strategies/GradientDescentAlgorithm.java

@@ -10,6 +10,7 @@ import eva2.server.go.problems.F1Problem;
 import eva2.server.go.problems.InterfaceFirstOrderDerivableProblem;
 import eva2.server.go.problems.InterfaceOptimizationProblem;
 import eva2.tools.EVAERROR;
+import eva2.tools.ReflectPackage;
 
 /** 
  * A gradient descent algorithm by hannes planatscher don't expect any
@@ -195,6 +196,12 @@ public class GradientDescentAlgorithm implements InterfaceOptimizer, java.io.Ser
       else {
     	  String msg="Warning, problem of type InterfaceFirstOrderDerivableProblem and template of type InterfaceDataTypeDouble is required for " + this.getClass();
     	  EVAERROR.errorMsgOnce(msg);
+    	  Class<?>[] clsArr = ReflectPackage.getAssignableClasses("eva2.server.go.problems.InterfaceFirstOrderDerivableProblem", true, true);
+    	  msg=msg+" (available: ";
+    	  for (Class<?> cls: clsArr) {
+    		  msg=msg+" "+cls.getSimpleName();
+    	  }
+    	  msg=msg+")";
     	  throw new RuntimeException(msg);
       }
     } // for loop population size

src/eva2/tools/ReflectPackage.java

@@ -365,17 +365,43 @@ public class ReflectPackage {
 	}
 	
 	/**
-	 * Retrieve assignable classes of the given package from classpath.
+	 * Retrieve assignable classes of the given package from classpath given by package name and Class instance.
 	 * 
 	 * @param pckg	String denoting the package
 	 * @param reqSuperCls
 	 * @return
 	 */
-	public static Class[] getAssignableClassesInPackage(String pckg, Class reqSuperCls, boolean includeSubs, boolean bSort) {
+	public static Class<?>[] getAssignableClassesInPackage(String pckg, Class reqSuperCls, boolean includeSubs, boolean bSort) {
 		if (TRACE) System.out.println("requesting classes assignable from " + reqSuperCls.getName());
 		return getClassesInPackageFltr(new HashSet<Class>(), pckg, includeSubs, bSort, reqSuperCls);
 	}
 	
+	/**
+	 * Retrieve assignable classes of the given package from classpath given by full class and package String,
+	 * such as eva2.server.go.problems.AbstractOptimizationProblem.
+	 * 
+	 * @param pckg	String denoting the package
+	 * @param reqSuperCls
+	 * @return
+	 */
+	public static Class<?>[] getAssignableClasses(String pckgClassName, boolean includeSubs, boolean bSort) {
+		int dotIndex = pckgClassName.lastIndexOf('.');
+		if (dotIndex <= 0) {
+			System.err.println("warning: " + pckgClassName + " is not a package!");
+			return null;
+		} else {		
+			String pckg = pckgClassName.substring(0, pckgClassName.lastIndexOf('.'));
+			Class<?>[] clsArr; 
+			try {
+				clsArr = ReflectPackage.getAssignableClassesInPackage(pckg, Class.forName(pckgClassName), includeSubs, bSort);
+			} catch (ClassNotFoundException e) {
+				e.printStackTrace();
+				clsArr = null;
+			}
+			return clsArr;
+		}
+	}
+	
 	public static void main(String[] args) {
 		ClassLoader cld =  Thread.currentThread().getContextClassLoader();
 		System.out.println("1: " + cld.getResource("/eva2/server"));