Weird behaviour about enum with methods

[David Li <da...@gmail.com>]

Hi all,

I encountered something weird about enum value in the object stored in
ignite cache.

for example:

class definition:

public class Application {
    private long id;
    private String name;
    private ApplicationType type;
}

enum definition:

public enum ApplicationType {
    TX {
        @Override
        public boolean isSupported() {
            return true;
        }
    },
    API {
        @Override
        public boolean isSupported() {
            return true;
        }
    };

    public abstract boolean isSupported();
}

then have a cache like:

IgniteCache<Long, Application> cache

When get back the Application instance from cache, the value of the type

property will not equal to the enum value in the enum class, i found their

hash code is different, even though they have same class name.

for example,

Application app = new Application(1L, "app 1", ApplicationType.API);

app.getType() == ApplicationType.API is true

app.getType().getClass().getName() is ApplicationType$2, hash code is 251520863


Application appFound = cache.get(app.getId());

appFound.getType() == Application.API is false

appFound.getType().getClass().getName() is ApplicationType$2, hash
code is 331596257


ApplicationType.API.hashCode() is 251520863


I tried an enum without any method definitions, then no issue. Any
idea about this?


BRs,

David

Re: Weird behaviour about enum with methods

[Andrey Mashenkov <an...@gmail.com>]

Hi David,

Looks like a bug. As a workaround, you can either use optimized marshaller
or compare enum ordinal.
I've created an issue IGNITE-5087 [1].

[1] https://issues.apache.org/jira/browse/IGNITE-5087

On Mon, Apr 24, 2017 at 10:57 AM, David Li <da...@gmail.com> wrote:

> Hi all,
>
> I encountered something weird about enum value in the object stored in
> ignite cache.
>
> for example:
>
> class definition:
>
> public class Application {
>     private long id;
>     private String name;
>     private ApplicationType type;
> }
>
> enum definition:
>
> public enum ApplicationType {
>     TX {
>         @Override
>         public boolean isSupported() {
>             return true;
>         }
>     },
>     API {
>         @Override
>         public boolean isSupported() {
>             return true;
>         }
>     };
>
>     public abstract boolean isSupported();
> }
>
> then have a cache like:
>
> IgniteCache<Long, Application> cache
>
> When get back the Application instance from cache, the value of the type
>
> property will not equal to the enum value in the enum class, i found their
>
> hash code is different, even though they have same class name.
>
> for example,
>
> Application app = new Application(1L, "app 1", ApplicationType.API);
>
> app.getType() == ApplicationType.API is true
>
> app.getType().getClass().getName() is ApplicationType$2, hash code is 251520863
>
>
> Application appFound = cache.get(app.getId());
>
> appFound.getType() == Application.API is false
>
> appFound.getType().getClass().getName() is ApplicationType$2, hash code is 331596257
>
>
> ApplicationType.API.hashCode() is 251520863
>
>
> I tried an enum without any method definitions, then no issue. Any idea about this?
>
>
> BRs,
>
> David
>
>
>


-- 
Best regards,
Andrey V. Mashenkov