Fix for Issue 34 - JSR 303 Validation groups are ignored for DDL

generation (of @NotNull)

src/main/java/com/avaje/ebeaninternal/server/deploy/parse/AnnotationFields.java

@@ -22,7 +22,6 @@ import javax.persistence.Transient;
 import javax.persistence.Version;
 import javax.validation.constraints.NotNull;
 import javax.validation.constraints.Size;
-
 import com.avaje.ebean.annotation.CreatedTimestamp;
 import com.avaje.ebean.annotation.EmbeddedColumns;
 import com.avaje.ebean.annotation.Encrypted;
@@ -193,9 +192,10 @@ public class AnnotationFields extends AnnotationParser {
 
     if (validationAnnotations) {
       NotNull notNull = get(prop, NotNull.class);
-      if (notNull != null) {
-        // explicitly specify a version column
-        prop.setNullable(false);
+      if (notNull != null && isNotNullOnAllValidationGroups(notNull.groups())) {
+        // Not null on all validation groups so enable
+        // DDL generation of Not Null Constraint
+        prop.setNullable(false);  
       }
   
       Size size = get(prop, Size.class);
@@ -255,6 +255,20 @@ public class AnnotationFields extends AnnotationParser {
 
   }
 
+  /**
+   * Return true if the validation is on all validation groups and hence
+   * can be applied to DDL generation.
+   */
+  private boolean isNotNullOnAllValidationGroups(Class<?>[] groups) {
+    if (groups.length == 0) {
+      return true;
+    }
+    if (groups.length == 1 && javax.validation.groups.Default.class.isAssignableFrom(groups[0])) {
+      return true;
+    }
+    return false;
+  }
+
   private void setEncryption(DeployBeanProperty prop, boolean dbEncString, int dbLen) {
 
     util.checkEncryptKeyManagerDefined(prop.getFullBeanName());