add void detection

Author: hoegertn

src/main/java/org/restdoc/server/impl/RestDocGenerator.java

@@ -288,7 +288,7 @@ private ResponseDefinition getMethodResponse(final Method method) {
 				def.header(restDocHeader.name(), restDocHeader.description(), restDocHeader.required());
 			}
 		}
-		if (def.getTypes().isEmpty()) {
+		if (def.getTypes().isEmpty() && !method.getReturnType().equals(Void.TYPE)) {
 			final String schema = SchemaResolver.getSchemaFromTypeOrNull(method.getGenericReturnType(), this.schemaMap, this.ext);
 			String[] mediaTypes = MediaTypeResolver.getProducesMediaType(method);
 			if (mediaTypes != null) {

src/main/java/org/restdoc/server/impl/util/SchemaResolver.java

@@ -57,6 +57,9 @@ public static String getSchemaFromType(final Type type, Map<String, Schema> sche
 	 * @return the schema URI
 	 */
 	public static String getSchemaFromTypeOrNull(final Type type, Map<String, Schema> schemaMap, IRestDocGeneratorExtension ext) {
+		if (type.equals(Void.TYPE)) {
+			return null;
+		}
 		if (type instanceof Class) {
 			return SchemaResolver.getSchemaFromClassOrNull((Class<?>) type, schemaMap, ext);
 		}

src/test/java/org/restdoc/server/impl/reflect/ReflectClass.java

@@ -38,6 +38,10 @@ public Msg[] rAMsg() {
 		return null;
 	}
 
+	public void rVoid() {
+		
+	}
+	
 	public void pString(String p) {
 		//
 	}

src/test/java/org/restdoc/server/impl/reflect/SchemaResolverTest.java

@@ -41,6 +41,7 @@ public void testReturn() {
 		Assert.assertEquals("string", SchemaResolver.getSchemaFromTypeOrNull(SchemaResolverTest.ret("rString"), this.map, null));
 		Assert.assertEquals("long", SchemaResolver.getSchemaFromTypeOrNull(SchemaResolverTest.ret("rLong"), this.map, null));
 		Assert.assertEquals("boolean", SchemaResolver.getSchemaFromTypeOrNull(SchemaResolverTest.ret("rLBoolean"), this.map, null));
+		Assert.assertEquals(null, SchemaResolver.getSchemaFromTypeOrNull(SchemaResolverTest.ret("rVoid"), this.map, null));
 	}
 
 	@Test