Init variables on each token handling

Should fix #3566

Author: harawata

src/main/java/org/apache/ibatis/builder/ParameterMappingTokenHandler.java

@@ -76,6 +76,8 @@ public List<ParameterMapping> getParameterMappings() {
 
   @Override
   public String handleToken(String content) {
+    genericType = null;
+    typeHandler = null;
     parameterMappings.add(buildParameterMapping(content));
     return "?";
   }