wuchong commented on a change in pull request #10563: [FLINK-15232][table] 
Message of NoMatchingTableFactoryException should tell users what's wrong
URL: https://github.com/apache/flink/pull/10563#discussion_r357515041
 
 

 ##########
 File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/api/NoMatchingTableFactoryException.java
 ##########
 @@ -58,24 +62,32 @@ public NoMatchingTableFactoryException(
                Class<?> factoryClass,
                List<TableFactory> factories,
                Map<String, String> properties) {
+               this(message, null, factoryClass, factories, properties, null);
+       }
 
-               this(message, factoryClass, factories, properties, null);
+       public NoMatchingTableFactoryException(
+                       String message,
+                       String matchCandidatesMessage,
+                       Class<?> factoryClass,
+                       List<TableFactory> factories,
+                       Map<String, String> properties) {
+               this(message, matchCandidatesMessage, factoryClass, factories, 
properties, null);
        }
 
        @Override
        public String getMessage() {
+               String matchCandidatesString = matchCandidatesMessage == null ?
+                               "" :
+                               "The match candidates: \n" + 
matchCandidatesMessage + "\n\n";
                return String.format(
                        "Could not find a suitable table factory for '%s' 
in\nthe classpath.\n\n" +
-                               "Reason: %s\n\n" +
+                               "Reason: %s\n\n" + matchCandidatesString +
                                "The following properties are 
requested:\n%s\n\n" +
                                "The following factories have been 
considered:\n%s",
                        factoryClass.getName(),
                        message,
                        DescriptorProperties.toString(properties),
-                       String.join(
-                               "\n",
-                               factories.stream().map(p -> 
p.getClass().getName()).collect(Collectors.toList())
-                       )
+                               factories.stream().map(p -> 
p.getClass().getName()).collect(Collectors.joining("\n"))
 
 Review comment:
   Indent. 

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