issue [pds-api-54]: wildcard searching

pom.xml

@@ -226,13 +226,13 @@
 		<dependency>
 			<groupId>gov.nasa.pds</groupId>
 			<artifactId>api-search-query-lexer</artifactId>
-			<version>0.0.1-SNAPSHOT</version>
+			<version>0.2.0-SNAPSHOT</version>
 		</dependency>
 
 		<dependency>
-			<groupId>com.tunnelvisionlabs</groupId>
+			<groupId>org.antlr</groupId>
 			<artifactId>antlr4-runtime</artifactId>
-			<version>4.7</version>
+			<version>4.9.2</version>
 		</dependency>
 
 		<dependency>

src/main/java/gov/nasa/pds/api/engineering/controllers/MyProductsApiBareController.java

@@ -11,6 +11,7 @@
 
 import javax.servlet.http.HttpServletRequest;
 
+import org.antlr.v4.runtime.misc.ParseCancellationException;
 import org.elasticsearch.action.get.GetRequest;
 import org.elasticsearch.action.get.GetResponse;
 import org.elasticsearch.action.search.SearchRequest;
@@ -210,7 +211,10 @@ protected ResponseEntity<Products> getProductsResponseEntity(String q, int start
               log.error("Couldn't serialize response for content type " + accept, e);
               return new ResponseEntity<Products>(HttpStatus.INTERNAL_SERVER_ERROR);
           }
-
+        	catch (ParseCancellationException pce) {
+        		log.error("Could not parse the query string: " + q);
+        		return new ResponseEntity<Products>(HttpStatus.UNPROCESSABLE_ENTITY);
+        	}            
         }
         else return new ResponseEntity<Products>(HttpStatus.NOT_IMPLEMENTED);
     }