Can't read my model , NPE ??

[hboumedane]

I have a simple model persisted to my orientdb database.
when I try to get a list of all models i'm having this error (I'm strugglin with this since yesterday) :

Method threw 'com.orientechnologies.orient.core.exception.ODatabaseException' exception. Cannot evaluate com.orientechnologies.orient.core.record.impl.ODocument.toString()

any idea were this error came from ?

[barjo]

Hi,

That doesn't ring a bell for me. Can you give a bit more of context on what is the model you are trying to list, and how you try to get the list.

[barjo]

Ah, Can you try implementing the toString method in your model ? Or have you override it. It's possible that some problem occur when Orient call toString on your model.

[hboumedane]

here my model :

@Entity
@JsonIgnoreProperties(value = {"handler"})
public class TokenApi
{
    @Id
    private String id;

    private String token;

    private Date created = Calendar.getInstance().getTime();

    public TokenApi() 
    {
    }

    public String getId() 
    {
        return id;
    }

    public void setId(String id)
    {
        this.id = id;
    }

    public String getToken() 
    {
        return token;
    }

    public void setToken(String token)
    {
        this.token = token;
    }

    public Date getCreated() 
    {
        return created;
    }

    public void setCreated(Date created)
    {
        this.created = created;
    }
}

and inside my component i do :

    @Model(value = TokenApi.class)
    private OrientDbCrud<TokenApi,String> _tokenCrud;

List<TokenApi> _listOfTokens = Utils.toList(_tokenCrud.findAll()); // here a get list of all my token
and here i get the exception that i mentioned before 

[hboumedane]

even with toString() i got the same exception and i can't read value of my object (NPE)

[barjo]

Do you know if it's the toList ? or findAll that trigger the NPE ? or is it after ?

[hboumedane]

not exactly, the NPE is triggered when i try to access my object , the findall give me a list and when i inspect that list i found all field are null and one filed containt the excption :

Method threw 'com.orientechnologies.orient.core.exception.ODatabaseException' exception. Cannot evaluate com.orientechnologies.orient.core.record.impl.ODocument.toString()

[barjo]

Oh I see, that's peculiar. Can you try without the Calendar.getInstance().getTime(); initialization. It may cause some serialization problem.

[barjo]

One things, if you use the @id annotation and change the id by yourself, it's gonna mess up orientdb Id. It may be good to remove the setId method, if you use the @id annotation.

[hboumedane]

i removed the setid and tryed without the Calendar.getInstance().getTime(); and still the same exception !!!

[barjo]

I couldn't reproduce with this model , it's strange :-? Can you try with the snapshots 0.2.3. I will go back home and investigate a bit more.

[hboumedane]

I'm already using the 0.2.3 snapshot

[barjo]

If you can send me the code, I will have a look at it :) and see if I can find the problem.

[hboumedane]

you have the model code above and here the other code :

@Component
@Provides
@Instantiate
public class TimeFilter  implements Filter {

      /*workaround to get this class imported to the classpath javassist.util.proxy.Proxy*/
    static {Class workaround = Proxy.class;}

    @Model(value = TokenApi.class)
    private OrientDbCrud<TokenApi,String> _tokenCrud;

    private static final Logger LOGGER = LoggerFactory.getLogger(TimeFilter.class.getName());

    private static final Pattern REGEX = Pattern.compile("/*.*");

    private TokenApi[] _listOfTokens;

    public Result call(Route route, RequestContext context) throws Exception {
        final long begin = System.currentTimeMillis();
        try {
               for(TokenApi tk : _listOfTokens)
                {
                    if(tk.getToken().equals(httpToken))
                    {
                        System.out.print("founded !!! ");
                    }                    
                }
            return context.proceed();
        } finally {
            final long end = System.currentTimeMillis();
            LOGGER.info("Time spent to reply to {} {} : {} ms",
                    route.getHttpMethod(), context.context().path(),
                    (end - begin));
        }
    }

    public Pattern uri() {
        return REGEX;
    }

    public int priority() {
        return 100;
    }

    @Validate
    public void start()
    {
        _listOfTokens = Iterables.toArray(_tokenCrud.findAll(), TokenApi.class);
    }
}

[barjo]

Ok, thanks I will try to reproduce it today.