Vaadin Lazy Loading Grid Error : java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0

Question

I'm trying to make lazy loading on vaadin grid, but I got error java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0 Here is my UI code :

// Grid Account
Grid<AccountModel> accountData = new Grid<>(AccountModel.class);
CallbackDataProvider<AccountModel, Void> accountDataProvider = DataProvider
        .fromCallbacks(
                query -> {
                    System.out.println("Offset :");
                    System.out.println(query.getOffset());
                    System.out.println("Limit :");
                    System.out.println(query.getLimit());
                    System.out.println("End Offset, Limit");
                    return accountServices.getAccountTableWithParam(query.getOffset(), query.getLimit()).stream();
                },
                query -> {
                    System.out.println("Count :");
                    int count = 0;
                    try {
                        count = accountServices.getAccountTableCount();
                    } catch (EndpointException ex) {
                        Logger.getLogger(AccountServices.class.getName()).log(Level.SEVERE, null, ex);
                    }
                    System.out.println(count);
                    System.out.println("END BRO");
                    return count;
                });

accountData.setDataProvider(accountDataProvider);
accountData.setColumns("accountId", "name", "balance", "allowNegativeBalance");       
add(accountData);

And here is my service code :

public List<AccountModel> getAccountTableWithParam(Integer limit, Integer offset) {
    List<AccountModel> datalog = null;
    try {
        datalog = new JsonResponseReader(restMockvaEndpoint.send(new EndpointRequestBuilder()
                .method("GET")
                .resource("/account")
                .property("offset", offset)
                .property("limit", limit)
                .build())).getContentTable(AccountModel.class).getData();
    } catch (EndpointException ex) {
        Logger.getLogger(AccountServices.class.getName()).log(Level.SEVERE, null, ex);
    }
    return datalog;
}

public int getAccountTableCount() throws EndpointException {
    int datalog = new JsonResponseReader(restMockvaEndpoint.send(new EndpointRequestBuilder()
                .method("GET")
                .resource("/account")
                .build()
        )).getContentTable(AccountModel.class).getData().size();
    return datalog;
}

And here is the Wildfly Log :

15:45:05,977 INFO  [org.eclipse.jetty.util.log] (default task-2) Logging initialized @964386ms to org.eclipse.jetty.util.log.Slf4jLog
15:45:06,157 INFO  [stdout] (default task-2) Count :
15:45:06,284 INFO  [stdout] (default task-2) 2
15:45:06,284 INFO  [stdout] (default task-2) END BRO
15:45:06,284 INFO  [stdout] (default task-2) Offset :
15:45:06,284 INFO  [stdout] (default task-2) 0
15:45:06,284 INFO  [stdout] (default task-2) Limit :
15:45:06,285 INFO  [stdout] (default task-2) 2
15:45:06,285 INFO  [stdout] (default task-2) End Offset, Limit
15:45:06,292 INFO  [stdout] (default task-2) Count :
15:45:06,300 INFO  [stdout] (default task-2) 2
15:45:06,300 INFO  [stdout] (default task-2) END BRO
15:45:06,303 ERROR [com.vaadin.flow.server.DefaultErrorHandler] (default task-2) : java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
    at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
    at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
    at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
    at java.base/java.util.Objects.checkIndex(Objects.java:372)
    at java.base/java.util.ArrayList.get(ArrayList.java:459)
    at deployment.TES-PROJECT-1.war//com.vaadin.flow.data.provider.DataCommunicator.lambda$getJsonItems$3(DataCommunicator.java:615)
    at java.base/java.util.stream.IntPipeline$1$1.accept(IntPipeline.java:180)
    at java.base/java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:104)
    at java.base/java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:699)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)

Any idea? Thank you

Answer 1

Pleae check the count variable and make sure the count aren't impacted to offset and limit