[IGNITE-12468] ClassCastException on thinClient in Apache Ignite

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6
• Fix Version/s: 2.9, 2.8.1
• Component/s: binary, clients, thin client
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Aleksey Plekhanov
• Reporter: LEE PYUNG BEOM
• Created: 19/Dec/19 01:34
• Updated: 17/Apr/20 06:54
• Resolved: 06/Feb/20 14:22

Description

 

    ClientConfiguration cfg = new ClientConfiguration().setAddresses("127.0.0.1:10800");

    try (IgniteClient igniteClient = Ignition.startClient(cfg)) {

        System.out.println(">>> Thin client put-get example started.");

        final String CACHE_NAME = "put-get-example";

        ClientCache<Integer, Object> cache = igniteClient.getOrCreateCache(CACHE_NAME);

        Person p = new Person();

        //put
        HashMap<Integer, Person> hm = new HashMap<Integer, Person>();
        hm.put(1, p);
        cache.put(1, hm);

        //get
        HashMap<Integer, Person> map = (HashMap<Integer, Person>)cache.get(1);
        Person p2 = map.get(1);

        System.out.format(">>> Loaded [%s] from the cache.\n",p2);

    }
    catch (ClientException e) {
        System.err.println(e.getMessage());
        e.printStackTrace();
    }
    catch (Exception e) {
        System.err.format("Unexpected failure: %s\n", e);
        e.printStackTrace();
    }

 

I use the thin client of apache-ignite.

I Create a hashmap and put the Person class(org.apache.ignite.examples.model.Person) object into it.

And when I take it out of the hashmap, I get the following exceptions:

 

> java.lang.ClassCastException:
> org.apache.enite.internal.binary.BinaryObjectImpl cannot be cast to
> org.apache.engite.examples.model.Person.

An exception is given in the code below.

 

Person p2 = map.get(1);

 

However, there is no exception if I modify the code as follows:

 

BinaryObject bo = (BinaryObject) map.get(1);

Person p2 = bo.deserialize();

I don't think that's necessary. Is there another solution?

 

Issue Links

• is duplicated by: IGNITE-12623 ClassCastException on Thin client when get cache value with List and Map
• relates to: IGNITE-12625 Thin client: Marshaling/unmarshaling of objects performed twice
• relates to: IGNITE-12578 CAS cache operations (replace(K, V, V), remove(K, V)) don't work with array data type
• relates to: IGNITE-12624 Java thin client: Wrong typeId generation for system types
• links to: GitHub Pull Request #7320
• links to: Pull request