I am looking for a neat way to initialize a List of Maps using Spring Boot from application.properties.
#ConfigurationProperties(prefix = "mail")
public class ConfigProperties {
private String hostName;
private int port;
private List<Map<String,String>> userList;
// standard getters and setters
}
I want to initialize the List of Maps "userList" from application.properties. How do we give values to mail.userList below in the application.properties file?
#application.properties
mail.hostname=host#mail.com
mail.port=9000
mail.userList=?
Thanks in advance.
You need to define it like this,
mail.userList[0].id=1
mail.userList[0].name=abc
mail.userList[1].id=2
mail.userList[1].name=pqr
mail.userList[2].id=3
mail.userList[2].name=xyz
This will load the in the userlist as list of map. Each entry in the list would contain
id and name.
Related
I have an application.property like this:
somevalue.api.test=something
somevalue.anotherproperty=stuff
I have made a configuration bean like this:
#Configuration
#ConfigurationProperties("somevalue")
public class SomeProperties {
#NotNull
private String apiTest;
#NotNull
private String anotherproperty;
}
Is it possible to refer to api.test like apiTest?
Mainly my issue is that I want to use the somevalue starting point for both property. I know if I don't separate with a dot the apiTest and I use it in this way somevalue.api-test I can refer to that with apiTest in my bean, but in my case it's not possible the renaming. So with dot separation can I achieve the same result or I should create two separate config bean, one refering to somevalue.api and the another only to somevalue?
If you can't rename the property then no, you can't reference it using String apiTest. You need an additional class as follows:
#Configuration
#ConfigurationProperties("somevalue")
public class GcssProperties {
#NotNull
private GcssApiProperties api;
#NotNull
private String anotherproperty;
}
public class GcssApiProperties {
#NotNull
private String test;
}
This should work.
class dto{#Value("${name}") private String name; }
application.properties
op.name=${OP_NAME:22-2}
//When I try to read it is returning null how to solve this
The #Value annotation will only be processed on Spring-managed beans (e.g. a #Component annotated class).
Additionally, you would need to specify the property key in #Value as follows in order to match with the key defined in your property file:
#Value("${op.name:fallback}")
private String name;
Your properties file can then carry the configurable value:
op.name=Some Name
I've the following domain and needs to return selected field in response to client. How can I achieve that using Spring?
public class Vehicle {
private String vehicleId;
private Long dateCreated;
private String ownerId;
private String colourCode;
private String engineNumber;
private String transmission;
//getters & setters
}
My objective is to return only colourCode and transmission fields to client request. I've read about DTO and seems like I can achieve my objective with DTO but I don't find any good example how to implement it. Is DTO is the correct way to achieve my objective ?
Basically you just create VehicleDTO class with parameters you need
public class VehicleDTO {
private String colourCode;
private String transmission;
//getters and setters
}
and then in your code you construct VehicleDTO from your Vehicle class. Fortunately, we have BeansUtils class from Spring, that uses reflection to copy properties of one object to another, because you do not want to repeat logic for copying properties for every object. So it would be something like:
BeanUtils.copyProperties(v1, dto);
At the end your return VehicleDTO in your response instead of Vehicle
You can return IVehicle interface which exposes your properties of choice
public interface IVehicle {
String getTransmission();
String getColourCode();
}
and your Vehicle implents it
public class Vehicle implements IVehicle{ }
There are various ways you can achieve what you want.
You can add relevant usecase / APi specific DTO for the resource.
e.g. If your API return the vehical general details you may want to expose some level of details,
public class VehicleDetailsDTO {
private String colourCode;
private String transmission;
private String engineNumber; //more
//getters and setters
}
You can then either use BeanUtils or Dozzer to convert your Vehical resource to transportable object like your DTO.
BeanUtils : http://commons.apache.org/proper/commons-beanutils/
Dozzer : http://dozer.sourceforge.net/documentation/mappings.html
Assuming you use JSON as output format and Jackson as serialization engine (default in Spring MVC), you can tell Jackson to not serialize null properties. Now you just need to populate the properties you need and can return the original business object.
I have a spring-boot application (1.4RC1, I know it's RC, but Spring Data Redis 1.7.2 is not) where I'm using spring-boot-starter-redis.
The application uses a Spring Data Repository (CrudRepository) which should save an object (using #RedisHash annotation) with String and Boolean properties and one custom class property, which also has only Strings and Longs as properties.
When I save an object (via the repository), everything went fine and I can see all the properties in the database as I would expect.
When I want to read the data from the database (via the repository) I only get the properties from the parent object. The custom class property is null.
I would expect to get the property loaded from the database as well. As the documentation states you can write a custom converter, but since I don't need to do that, when I want to write the data, I shouldn't need to write a reading converter as well.
I wonder if I need to annotate the custom class property, but I couldn't find anything in the documentation. Can you point me in the right direction?
The classes are as follows:
Class sample:
#Data
#EqualsAndHashCode(exclude = {"isActive", "sampleCreated", "sampleConfiguration"})
#RedisHash
public class Sample {
#Id
private String sampleIdentifier;
private Boolean isActive;
private Date sampleCreated;
private SampleConfiguration sampleConfiguration;
public Sample(String sampleIdentifier, SampleConfiguration sampleConfiguration){
this.sampleIdentifier = sampleIdentifier;
this.sampleConfiguration = sampleConfiguration;
}
}
Class SampleConfiguration:
#Data
public class SampleConfiguration {
private String surveyURL;
private Long blockingTime;
private String invitationTitle;
private String invitationText;
private String participateButtonText;
private String doNotParticipateButtonText;
private String optOutButtonText;
private Long frequencyCappingThreshold;
private Long optOutBlockingTime;
}
I added #NoArgsConstructor to my Sample class as Christoph Strobl suggested. Then the repository reads the SampleConfiguration correctly. Thanks, Christoph!
In a Spring bean, I need to process a configuration property before using is, e.g.:
#Component
class UsersController {
#Value("${roles}")
private String rolesAsString;
private List<String> roles;
#PostConstruct
public void initRoles() {
// just an example, not necessarily string splitting
roles = rolesAsString.split(",");
}
This works, but I am left with an unneeded member variable 'rolesString'. What would be a clean concise way to only keep the processed value?
Properties is
roles=role1,role2,role3
Code is :
#Value("#{'${roles}'.split(',')}")
private List<String> roles;