Show summary of validation errors

This way the stack trace will have more information when a
ValidationException happens.

FEA: ItEr71S04BugFixing

navalplanner-business/src/main/java/org/navalplanner/business/common/BaseEntity.java

@@ -111,8 +111,7 @@ public abstract class BaseEntity implements INewObject {
     @Override
     public String toString() {
         try {
-            return super.toString() + "[ id: " + getId() + ", newObject: "
-                    + isNewObject() + "]";
+            return super.toString() + getExtraInformation();
         } catch (Exception e) {
             final String message = "error doing toString";
             LOG.error(message, e);
@@ -120,4 +119,9 @@ public abstract class BaseEntity implements INewObject {
         }
     }
 
+    public String getExtraInformation() {
+        return "[ id: " + getId() + ", newObject: "
+                + isNewObject() + "]";
+    }
+
 }

navalplanner-business/src/main/java/org/navalplanner/business/common/exceptions/ValidationException.java

@@ -23,6 +23,7 @@ package org.navalplanner.business.common.exceptions;
 
 import org.apache.commons.lang.Validate;
 import org.hibernate.validator.InvalidValue;
+import org.navalplanner.business.common.BaseEntity;
 
 /**
  * Encapsulates some validation failure <br />
@@ -30,6 +31,38 @@ import org.hibernate.validator.InvalidValue;
  */
 public class ValidationException extends RuntimeException {
 
+    private static String getValidationErrorSummary(
+            InvalidValue... invalidValues) {
+        StringBuilder builder = new StringBuilder();
+        for (InvalidValue each : invalidValues) {
+            builder.append(summaryFor(each));
+            builder.append("; ");
+        }
+        if (invalidValues.length > 0) {
+            builder.delete(builder.length() - 2, builder.length());
+        }
+        return builder.toString();
+    }
+
+    private static String summaryFor(InvalidValue invalidValue) {
+        return "at " + asString(invalidValue.getBean()) + " "
+                + invalidValue.getPropertyPath() + ": "
+                + invalidValue.getMessage();
+    }
+
+    private static String asString(Object bean) {
+        if (bean == null) {
+            // this shouldn't happen, just in case
+            return "null";
+        }
+        if (bean instanceof BaseEntity) {
+            BaseEntity entity = (BaseEntity) bean;
+            return bean.getClass().getSimpleName() + " "
+                    + entity.getExtraInformation();
+        }
+        return bean.toString();
+    }
+
     private InvalidValue[] invalidValues;
 
     public InvalidValue[] getInvalidValues() {
@@ -37,7 +70,7 @@ public class ValidationException extends RuntimeException {
     }
 
     public ValidationException(InvalidValue invalidValue) {
-        super();
+        super(getValidationErrorSummary(invalidValue));
         storeInvalidValues(toArray(invalidValue));
     }
 
@@ -48,7 +81,7 @@ public class ValidationException extends RuntimeException {
     }
 
     public ValidationException(InvalidValue[] invalidValues) {
-        super();
+        super(getValidationErrorSummary(invalidValues));
         storeInvalidValues(invalidValues);
     }