[
https://issues.apache.org/jira/browse/FLINK-1978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14530197#comment-14530197
]
Flavio Pompermaier commented on FLINK-1978:
-------------------------------------------
The error can be reproduced with the following code:
public class PojoDateError {
@SuppressWarnings("unused")
private static final Logger LOG =
LoggerFactory.getLogger(AciEsIndexer.class);
//
*************************************************************************
// PROGRAM
//
*************************************************************************
public static void main(String[] args) throws Exception {
// set up the execution environment
final ExecutionEnvironment env =
ExecutionEnvironment.getExecutionEnvironment();
Collection<Tuple2<String,Person>> peopleColl = new
ArrayList<>();
peopleColl.add(new Tuple2<String,Person> ("1",new
Person("1","test-person1",new Date())));
peopleColl.add(new Tuple2<String,Person> ("2",new
Person("2","test-person2",null)));
peopleColl.add(new Tuple2<String,Person> ("3",new
Person("3","test-person3",new Date())));
DataSet<Tuple2<String,Person>> people =
env.fromCollection(peopleColl);
DataSet<Tuple2<String, Vehicle>> vehicles =
env.fromCollection(Arrays.asList(new Tuple2<String,Vehicle> ("AA",new
Vehicle("1","test-vehicle",new Date()))));
DataSet<Tuple2<String,String>> vehiclesOwnersRel =
env.fromCollection(Arrays.asList(
new Tuple2<String,String>("AA","1"),
new Tuple2<String,String>("AA","2"),
new Tuple2<String,String>("AA","3")
));
DataSet<Tuple2<String,Person>> vehiclesOwners =
vehiclesOwnersRel
.join(people).where(1).equalTo(0).with(new
JoinFunction<Tuple2<String,String>,Tuple2<String,
Person>,Tuple2<String,Person>>(){
private Tuple2<String, Person>
reuse = new Tuple2<>();
@Override
public Tuple2<String, Person>
join(
Tuple2<String,
String> rel, Tuple2<String, Person> p)
throws
Exception {
reuse.f0 = rel.f0;
reuse.f1 = p.f1;
return reuse;
}
});
vehicles.coGroup(vehiclesOwners).where(0).equalTo(0).with(new
CoGroupFunction<Tuple2<String,
Vehicle>,Tuple2<String,Person>,Tuple2<String,Vehicle>>(){
private Tuple2<String,Vehicle> reuse = new
Tuple2<>();
@Override
public void coGroup(Iterable<Tuple2<String,
Vehicle>> vIt,
Iterable<Tuple2<String,
Person>> pIt,
Collector<Tuple2<String,Vehicle>> out) throws Exception {
for (Tuple2<String, Vehicle> off : vIt)
{
List<Person> owners =
off.f1.owners;
for (Tuple2<String, Person> e :
pIt) {
if(owners == null){
owners = new
ArrayList<>();
off.f1.owners =
owners;
}
owners.add(e.f1);
}
reuse.f0 = off.f0;
reuse.f1 = off.f1;
out.collect(reuse);
break;
}
}
}).print();
env.execute();
}
static class Person {
public String id;
public String name;
public Date birthDate;
public Person(){}
public Person(String id, String name, Date birthDate) {
this.id = id;
this.name = name;
this.birthDate = birthDate;
}
public Person(String id) {
this.id = id;
}
@Override
public String toString() {
return this.id;
}
}
static class Vehicle {
public String id;
public String plate;
public List<Person> owners;
public Date registrationDate;
public Vehicle(){}
public Vehicle(String id, String plate, Date registrationDate) {
this.id = id;
this.plate = plate;
this.registrationDate = registrationDate;
}
@Override
public String toString() {
return this.plate;
}
}
}
> POJO serialization NPE
> ----------------------
>
> Key: FLINK-1978
> URL: https://issues.apache.org/jira/browse/FLINK-1978
> Project: Flink
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.9
> Reporter: Flavio Pompermaier
>
> NullPointer on serialization of a Date field
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