 Android: Sax parsing returns null values and retrieve values in tags of same name
By : user3021227
Date : March 29 2020, 07:55 AM
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 Hibernate returns list with null values (OneToMany annotation with List type)
By : matmurray
Date : March 29 2020, 07:55 AM
To fix the issue you can do I am experiencing a problem where as Hibernate (4.1.8.FINAL) returns a list with NULL values (unidirectional OneToMany mapping). , I found the solution, I used it and this solved the issue code :
@OneToMany(orphanRemoval = true)
@LazyCollection(LazyCollectionOption.FALSE)
@JoinColumn(name = "entry_id")
@OrderBy("precedence")
private List<EntryAddress> addresses;
@OneToMany(orphanRemoval = true)
@LazyCollection(LazyCollectionOption.FALSE)
@JoinColumn(name = "entry_id")
@OrderBy("precedence")
private List<EntryContact> contacts;
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Android - Volley with GSON returns null list of values
By : Legend Protocol
Date : March 29 2020, 07:55 AM
wish helps you EDIT: to @njzk2 I was able to correct this, the problem lies in the objArray class, the variable holding the array is called "results", there is no element or array in the JSON file called results, that's what made the value null, my array in the JSON file was called "tag", thus the variable should have been named "tag". code :
public ArrayList<Tag> tag;
return Response.success(gson.fromJson(new JSONObject(json).getString("tag"),clazz),HttpHeaderParser.parseCacheHeaders(response));
public class obj {
private String id;
private String name;
public obj(){}
public int getId() {
return id;
}
public String getName() {
return name;
}
public void setId(String id) {
this.id = id;
}
public void setName(String name) {
this.name= name;
}
}
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 Recursively adding to list returns null
By : John Cizmar
Date : March 29 2020, 07:55 AM
should help you out Your code fails because you forgot the else part in the cond expression, also the way you're appending a single element to the end of a list is incorrect. This should fix the problems: code :
(define (add-end set)
(cond ((null? set)
'())
(else
(cons (append (first set) (list (first (first set))))
(add-end (rest set))))))
(define (add-end set)
(map (lambda (lst)
(append lst (list (first lst))))
set))
(add-end '((0 0 1) (1 0 0) (0 1 0)))
=> '((0 0 1 0) (1 0 0 1) (0 1 0 0))
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Firebase/Android: Adding retrieved values from Firebase to arraylist returns null pointer exception
By : Jcdavo
Date : March 29 2020, 07:55 AM
To fix this issue It's hard to be certain from the code you shared, by I suspect you may be bitten by the fact that all data is loaded from Firebase asynchronously. Alternatively you may simply not have permission to read the data. I'll give an answer for both. Data is loaded asynchronously code :
System.out.println("Before attaching listener");
q.addChildEventListener(new ChildEventListener() {
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
System.out.println("In onChildAdded");
}
public void onChildChanged(DataSnapshot dataSnapshot, String s) { }
public void onChildRemoved(DataSnapshot dataSnapshot) { }
public void onChildMoved(DataSnapshot dataSnapshot, String s) { }
public void onCancelled(DatabaseError databaseError) { }
});
System.out.println("After attaching listener");
q.addChildEventListener(new ChildEventListener() {
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
allBrands.add((dataSnapshot.getValue(Brand.class)).getBrandName());
System.out.println(allBrands.length);
}
public void onCancelled(DatabaseError databaseError) {
throw databaseError.toException();
}
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code :
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