Getting field name as string for already defined class. Is that possible?

Getting field name as string for already defined class. Is that possible?

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Getting field name as string for already defined class. Is that possible?
Tag : java , By : Shane
Date : December 01 2020, 04:47 PM

it fixes the issue It is not possible for Fields to get name as String of the field this way, using reflection.

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Using SubSonic, how to add a field to a pre-defined class?

Tag : development , By : user186435
Date : March 29 2020, 07:55 AM
like below fixes the issue Use a partial class. All classes in Subsonic are defined as partial. What you do is (in a separate file than the one that is generated by Subsonic), you create another part of the partial class with the additional property.
Option 2 here: http://jamesewelch.wordpress.com/2008/09/24/how-to-use-custom-audit-fields-with-subsonic/

how can it be that my class field changes although its defined static?

Tag : class , By : lili
Date : March 29 2020, 07:55 AM
this will help Declaring a field as final means that you can't assign a new value to it. If, however, that field contains an Object, you can still modify non-final fields inside of that Object. The code below should illustrate what I mean.
class Foo {
    private final Bar foo; 

    public Foo() {
        foo = new Bar();

    public void testFoo() {
        this.foo = new Bar(); // compile error
        this.foo.setBar("Test"); // works fine

class Bar {
    private String bar;

    public void setBar(String bar) {
        this.bar = bar;

    public String getBar() {
        return bar;

Jackson - Map JSON string field to class/pojo that has only one field (a string)

Tag : java , By : Boyer C.
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Use @JsonCreator for deserializing and use @JsonValue for Serializing. Have tested the code. Please make sure that getJsonString() is public method.
For example:
public class User{
    private String username;

    public String getJsonString() {
         return username;

    private static User parseJson(String jsonStr) {
        User u = new User();
        u.username = jsonStr;
        return u;

    public static void main(String[] args) {
        User u = new User();
        u.userName = "Niraj";

        ObjectMapper m = new ObjectMapper();
        String jsonString = m.writeValueAsString(u);
        User u1 = m.readValue(jsonString, User.class);

Getting data from a string defined table name filtered on a string defined field

Tag : chash , By : Henry Fatino
Date : March 29 2020, 07:55 AM
Hope that helps I am trying to return the contents of a Where filtered table of dynamic type based on a dynamic field name from an array of values. , There any many flaws in this single line of code:
var results = typeof(System.Linq.Enumerable).GetMethods().Where(x => x.Name == "Where").First().Invoke(db, new object[] { lambda });
IQueryable results = Queryable.Where((dynamic)entityTable, (dynamic)lambda);
public static MethodCallExpression Call(
    Type type, 
    string methodName,
    Type[] typeArguments,
    params Expression[] arguments);
var query = (IQueryable)db.GetType().GetProperty(linkingTable).GetValue(db);
// e =>
var entity = Expression.Parameter(query.ElementType, "e");
// ids.Contains(e.idField)
// = Enumerable<int>.Contains(ids, e.idField)
var containsCall = Expression.Call(
    new Type[] { typeof(int) },
    Expression.Property(entity, idField)
// e => ids.Contains(e.idField)
var predicate = Expression.Lambda(containsCall, entity);
// query = query.Where(predicate);
query = Queryable.Where((dynamic)query, (dynamic)predicate);
// query.Where(predicate)
// = Queryable.Where<ElementType>(query, predicate)
var whereCall = Expression.Call(
    new Type[] { query.ElementType },
// query = query.Where(predicate)
query = query.Provider.CreateQuery(whereCall);
var query = ((IQueryable)db.GetType().GetProperty(linkingTable).GetValue(db))
    .Where($"@0.Contains({idField})", ids);

How to new a class by name that defined in the field of type in generics class

Tag : java , By : Mikael
Date : March 29 2020, 07:55 AM
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