The notBlank validation of the type should tell which parameter is not valid.

Robert Winkler · Robert Winkler · commit 81edab38f3b7 · 2017-01-03T15:58:43.000+01:00
diff --git a/src/main/java/io/github/swagger2markup/internal/type/BasicType.java b/src/main/java/io/github/swagger2markup/internal/type/BasicType.java
@@ -38,7 +38,7 @@ public BasicType(String type, String name) {
 
     public BasicType(String type, String name, String format) {
         super(name);
-        Validate.notBlank(type);
+        Validate.notBlank(type, "Type of parameter '%s' must not be blank", name);
         this.type = type;
         this.format = format;
     }

Original file line number	Diff line number	Diff line change
`@@ -38,7 +38,7 @@ public BasicType(String type, String name) {`
`38`	`38`
`39`	`39`	`public BasicType(String type, String name, String format) {`
`40`	`40`	`super(name);`
`41`		`- Validate.notBlank(type);`
	`41`	`+ Validate.notBlank(type, "Type of parameter '%s' must not be blank", name);`
`42`	`42`	`this.type = type;`
`43`	`43`	`this.format = format;`
`44`	`44`	`}`