com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to long

com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to long

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com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to long
Tag : java , By : fstender
Date : December 01 2020, 04:52 PM

hope this fix your issue The quantity and discount are the Long values in your firebase database where in your Cart class it is declared as String. This is throwing the error. Declare the Cart class like the following.
public class Cart {

    private String pid, pname, price;
    private Long discount, quantity;

    public Cart() {

    public Cart(String pid, String pname, String price, Long discount, Long quantity) {
        this.pid = pid;
        this.pname = pname;
        this.price = price;
        this.discount = discount;
        this.quantity = quantity;

    public String getPid() {
        return pid;

    public void setPid(String pid) {
        this.pid = pid;

    public String getPname() {
        return pname;

    public void setPname(String pname) {
        this.pname = pname;

    public String getPrice() {
        return price;

    public void setPrice(String price) {
        this.price = price;

    public Long getDiscount() {
        return discount;

    public void setDiscount(Long discount) {
        this.discount = discount;

    public Long getQuantity() {
        return quantity;

    public void setQuantity(Long quantity) {
        this.quantity = quantity;

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Firebase DatabaseException: Failed to convert value of type java.lang.Long to String

Tag : java , By : woxorz
Date : March 29 2020, 07:55 AM
around this issue The problem is that you are creating the property "mobile_phone" as a String and on Firebase it is a Long type.
private String mobile_phone;
private Long mobile_phone;

firebase.database.DatabaseException: Failed to convert value of type java.lang.Long to String

Tag : android , By : wiznick
Date : March 29 2020, 07:55 AM
I wish this help you [] , The two nodes in your database indeed have a mismatch of data type :
myAnswer : "21"
myAnswer : 11
myAnswer : "21"
myAnswer : "11"
myAnswer : 21
myAnswer : 11

com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to double

Tag : android , By : Francis
Date : March 29 2020, 07:55 AM
This might help you my data in my firebase was a string instead of a double for the locationLong and locationLat as evident as the 2 quotation marks in the data.
So the moral of the story here is check your variables

com.google.firebase.database.DatabaseException: Failed to convert value of type java.lang.Double to String

Tag : android , By : somebody
Date : March 29 2020, 07:55 AM
Hope that helps I was added some values to test and I forgot to remove them from the firebase realtime database.. And later i realized and deleted them then it worked, thanks

Firebase DatabaseException Failed to convert value of type java.lang.Long to String

Tag : java , By : ezzze
Date : March 29 2020, 07:55 AM
will help you String totalAmount is causing the issue.
In your FirebaseDB it shows value as 0 which is of a long value type. But in your POJO class it is declared as String. Hence the exception.
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