Java Community | Help. Code. Learn.•6mo ago

couldnt resolve placeholder from the config

hey guys. i have this config:

    bankAccounts:
      - iban: "LT123"
        cashRegId: 2
      - iban: "LT345"
        cashRegId: 2

    bankAccounts:
      - iban: "LT123"
        cashRegId: 2
      - iban: "LT345"
        cashRegId: 2

and i have this config:

@Component
@Configuration
@Getter
@Setter
public class BankAccountConfig {
    @Value("${bankAccounts}")
    private List<BankAccount> bankAccounts;
}

@Component
@Configuration
@Getter
@Setter
public class BankAccountConfig {
    @Value("${bankAccounts}")
    private List<BankAccount> bankAccounts;
}

and the thing is that idk how to tell @Value that i want to have a list. bc rn i need to specify an element. intellij suggests me this: @Value("${bankAccounts[0].iban}") any help? thx

66 Replies

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Peter Rader•6mo ago

Hint: You dont need to quote IBANS Try this instead:

    bankAccounts:
      - 
        iban: LT123
        cashRegId: 2
      - 
        iban: LT345
        cashRegId: 2

    bankAccounts:
      - 
        iban: LT123
        cashRegId: 2
      - 
        iban: LT345
        cashRegId: 2

bambyzasOP•6mo ago

wait. do i add tab, or space?

Peter Rader•6mo ago

NEVER TAB, spaces only! 😄

bambyzasOP•6mo ago

thanks LD

JavaBot•6mo ago

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bambyzasOP•6mo ago

u mean like that?

Peter Rader•6mo ago

I would add another space in 53 and 54.

bambyzasOP•6mo ago

but is it even possible to do what i want? i.e. inject a list of objects in my Config class?

bambyzasOP•6mo ago

crap, still doesnt work

Peter Rader•6mo ago

It should, is that the complete Config-class?

bambyzasOP•6mo ago

Peter Rader•6mo ago

Oh, you need getter and setter for the private-field. And you need the @ConfigurationProperties("xxx") on that class.

bambyzasOP•6mo ago

on that class. on which one? on my BankAccountConfig or BankAccount?

Peter Rader•6mo ago

BankAccountConfig

bambyzasOP•6mo ago

but i dont understand what to write between quotes

Peter Rader•6mo ago

Could you create another namespace before the config bankAccounts? Maybe empty is ok.

bambyzasOP•6mo ago

my application.yaml looks like this. im not sure i understand what u mean

Peter Rader•6mo ago

I reproduced your problem and it works for me.

bambyzasOP•6mo ago

so do i need to have @ConfigurationProperties annotation?

Peter Rader•6mo ago

Yes. I send you my working-example 1 Moment My main class:

package test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import jakarta.annotation.PostConstruct;

@SpringBootApplication
@EnableAutoConfiguration
@EnableConfigurationProperties(BankAccountConfig.class)
public class AppConfig {
    public static void main(String... args) {
        SpringApplication.run(AppConfig.class, args);
    }

    @Autowired
    BankAccountConfig test;

    @PostConstruct
    public void post() {
        System.out.println(test.getBankAccounts());
    }
}

package test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import jakarta.annotation.PostConstruct;

@SpringBootApplication
@EnableAutoConfiguration
@EnableConfigurationProperties(BankAccountConfig.class)
public class AppConfig {
    public static void main(String... args) {
        SpringApplication.run(AppConfig.class, args);
    }

    @Autowired
    BankAccountConfig test;

    @PostConstruct
    public void post() {
        System.out.println(test.getBankAccounts());
    }
}

My BankAccountConfig:

package test;

import java.util.List;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties("payment-import.baltic-gateway")
public class BankAccountConfig {

    public List<BankAccount> bankAccounts;

    public List<BankAccount> getBankAccounts() {
        return bankAccounts;
    }

    public void setBankAccounts(List<BankAccount> bankAccounts) {
        this.bankAccounts = bankAccounts;
    }
}

package test;

import java.util.List;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties("payment-import.baltic-gateway")
public class BankAccountConfig {

    public List<BankAccount> bankAccounts;

    public List<BankAccount> getBankAccounts() {
        return bankAccounts;
    }

    public void setBankAccounts(List<BankAccount> bankAccounts) {
        this.bankAccounts = bankAccounts;
    }
}

My BankAccount:

package test;

public class BankAccount {
    private String iban;
    private long cashRegId;

    public void setIban(String iban) {
        this.iban = iban;
    }

    public String getIban() {
        return iban;
    }

    public void setCashRegId(long cashRegId) {
        this.cashRegId = cashRegId;
    }

    public long getCashRegId() {
        return cashRegId;
    }

}

package test;

public class BankAccount {
    private String iban;
    private long cashRegId;

    public void setIban(String iban) {
        this.iban = iban;
    }

    public String getIban() {
        return iban;
    }

    public void setCashRegId(long cashRegId) {
        this.cashRegId = cashRegId;
    }

    public long getCashRegId() {
        return cashRegId;
    }

}

My Config:

 paymentImport:
   balticGateway:
     bankAccounts:
       - 
         iban: LT123
         cashRegId: 2
       - 
         iban: LT345
         cashRegId: 2

 paymentImport:
   balticGateway:
     bankAccounts:
       - 
         iban: LT123
         cashRegId: 2
       - 
         iban: LT345
         cashRegId: 2

Output:

2024-06-18T13:21:08.262+02:00  INFO 4932 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2024-06-18T13:21:08.262+02:00  INFO 4932 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 388 ms
[test.BankAccount@176996c3, test.BankAccount@411c6d44]
2024-06-18T13:21:08.312+02:00  INFO 4932 --- [           main] o.s.b.a.w.s.WelcomePageHandlerMapping    : Adding welcome page: class path resource [META-INF/resources/index.html]
2024-06-18T13:21:08.407+02:00  INFO 4932 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port 8080 (http) with context path '/'

2024-06-18T13:21:08.262+02:00  INFO 4932 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2024-06-18T13:21:08.262+02:00  INFO 4932 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 388 ms
[test.BankAccount@176996c3, test.BankAccount@411c6d44]
2024-06-18T13:21:08.312+02:00  INFO 4932 --- [           main] o.s.b.a.w.s.WelcomePageHandlerMapping    : Adding welcome page: class path resource [META-INF/resources/index.html]
2024-06-18T13:21:08.407+02:00  INFO 4932 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port 8080 (http) with context path '/'

You realy need the @EnableConfigurationProperties(BankAccountConfig.class)!

bambyzasOP•6mo ago

idk man. previously i had

@ConfigurationProperties(prefix="payment-import.baltic-gateway")
public class BankAccountConfig {
    private List<BankAccount> bankAccounts;

@ConfigurationProperties(prefix="payment-import.baltic-gateway")
public class BankAccountConfig {
    private List<BankAccount> bankAccounts;

and everything was fine. i didnt even need to have @EnableConfigurationProperties(BankAccountConfig.class)

Peter Rader•6mo ago

@EnableConfigurationProperties(BankAccountConfig.class) should go to the appconfig. Not the BankAccountConfig Do you have setter for BankAccounts in BankAccountConfig?

bambyzasOP•6mo ago

idk its a good idea

bambyzasOP•6mo ago

nope, didnt need it bc BankAccount is:

@Getter
@Setter
public class BankAccount {
    String iban;
    Long cashRegId;
}

@Getter
@Setter
public class BankAccount {
    String iban;
    Long cashRegId;
}

Peter Rader•6mo ago

No no no, I did not meant the application.yml, I meant the AppConfigClass! You need to add @EnableConfigurationProperties(BankAccountConfig.class) to the application-config-java-class! I am pretty sure you need the setter. But I guess the setter is automatically generated by the @Setter annotation.

bambyzasOP•6mo ago

yep

Peter Rader•6mo ago

Ok, did you add @EnableConfigurationProperties(BankAccountConfig.class) to the application-config-java-class?

bambyzasOP•6mo ago

but i have like 5 config classes. why do i need to add only BankAccountConfig class to my application config java class?

Peter Rader•6mo ago

Hm, did you already have a @EnableConfigurationProperties in your application-config-java-class?

bambyzasOP•6mo ago

nope. dont have it anywehere

Peter Rader•6mo ago

BankAccountConfig Is not a application-config-java-class by-the-way.

bambyzasOP•6mo ago

i never said it is 😦

Peter Rader•6mo ago

Ah ok.

bambyzasOP•6mo ago

np but i still dont get it

bambyzasOP•6mo ago

why cant this work? why is Spring so against it?

bambyzasOP•6mo ago

it IS a list of objects

Peter Rader•6mo ago

Because bankAccounts are "configuration-properties" and not plain properties. Only @EnableConfigurationProperties(BankAccountConfig.class) allow spring to call the constructor of the class "BankAccount". The word "ConfigurationProperties" have a very special meaning.

bambyzasOP•6mo ago

ok, but why did the old config versin work?

Peter Rader•6mo ago

This works great, do not change that!

bambyzasOP•6mo ago

i know it works, but i need to change it

Peter Rader•6mo ago

You might consider to remove the @Component. And you might consider to remove the prefix=. Why do you need to change it?

bambyzasOP•6mo ago

i need to separate bank accounts. i want to have two separate lists. smth like this:

bambyzasOP•6mo ago

i have two banks: bank1 and bank2. and i want to have a list of accounts for each of them

Peter Rader•6mo ago

oh, I think I got your question wrong the whole time.

bambyzasOP•6mo ago

doesnt matter. its ok

Peter Rader•6mo ago

-_-

bambyzasOP•6mo ago

and now i need to structure my application.yaml and tweak my BankAccountConfig a little and idk how to do it properly

Peter Rader•6mo ago

 paymentImport:
   balticGateway:
     bank1BankAccounts:
       - 
         iban: LT123
         cashRegId: 2
     bank2BankAccounts:
       - 
         iban: LT345
         cashRegId: 2

 paymentImport:
   balticGateway:
     bank1BankAccounts:
       - 
         iban: LT123
         cashRegId: 2
     bank2BankAccounts:
       - 
         iban: LT345
         cashRegId: 2

This might work

bambyzasOP•6mo ago

ok. but u see, i have this config

bambyzasOP•6mo ago

and in the 51st line there are accounts of bank1 id like to separate config and properties by the banks like in the 41st line idk if u understood me haha

Peter Rader•6mo ago

In line 43-45 the fields of bank1 do not match the fields in the class BankAccount

bambyzasOP•6mo ago

ok, ill show u what i want to achieve

bambyzasOP•6mo ago

i want to have this application.yml

Peter Rader•6mo ago

ah, it is getting clearer.

bambyzasOP•6mo ago

and in my BankAccountCOnfig i want to have everything like this:

public class BankAccountConfig {
    @Value("${paymentImport.balticGateway.bank1.bankAccounts}")
    private List<BankAccount> bank1BankAccounts;
    @Value("${paymentImport.balticGateway.bank2.iban}")
    private List<BankAccount> bank2BankAccounts;
}

public class BankAccountConfig {
    @Value("${paymentImport.balticGateway.bank1.bankAccounts}")
    private List<BankAccount> bank1BankAccounts;
    @Value("${paymentImport.balticGateway.bank2.iban}")
    private List<BankAccount> bank2BankAccounts;
}

but @Value("${paymentImport.balticGateway.bank1.bankAccounts}") doesnt work, because Spring wont (for some reason) accept list

Peter Rader•6mo ago

Are you sure you could use @Value in a class that have the @ConfigurationProperties annotation?

bambyzasOP•6mo ago

im just showing you pseudocode what i want to do 😄

Peter Rader•6mo ago

Can you give an example of two bankacounts in line 7? The configuration looks like there is only one bank-account possible.

bambyzasOP•6mo ago

"LT516126515919194" for example. doesnt matter tbh. why are you asking?

Peter Rader•6mo ago

You wrote this pseudocode:

 
  @Value("${paymentImport.balticGateway.bank2.iban}")
    private List<BankAccount> bank2BankAccounts;

 
  @Value("${paymentImport.balticGateway.bank2.iban}")
    private List<BankAccount> bank2BankAccounts;

but one iban is a string. String != List<BankAccount>

bambyzasOP•6mo ago

huh? you asked me about 7th line not 9th oh, wiat so the question is still there

Peter Rader•6mo ago

I give up, I dont get your question. Maybe someone else can help.

bambyzasOP•6mo ago

😄 maybe someone else can help me out?

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couldnt resolve placeholder from the config