Could not resolve placeholder in string value

Question

I am trying to use properties from a .properties file, but it doesn\'t seem to work.

Here is my code:

@Service(\"ServiceFTP\")
@Transact         


        

Answer 1

In my case, I was careless while merging the application.yml file, and I've unnecessary indented my properties to the right.

I've indented it like this:

spring:
    application:
       name: applicationName
............................
    myProperties:
       property1: property1value

While the code expected it to be like this:

spring:
    application:
        name: applicationName
.............................
myProperties:
    property1: property1value

Answer 2

My solution was to add a space between the $ and the {.

For example:

@Value("${project.ftp.adresse}")

becomes

@Value("$ {project.ftp.adresse}")

Answer 3

This Issue occurs if the application is unable to access the some_file_name.properties file.Make sure that the properties file is placed under resources folder in spring.

Trouble shooting Steps

1: Add the properties file under the resource folder.

2: If you don't have a resource folder. Create one by navigating new by Right click on the project new > Source Folder, name it as resource and place your properties file under it.

For annotation based Implementation

Add @PropertySource(ignoreResourceNotFound = true, value = "classpath:some_file_name.properties")//Add it before using the place holder

Example:

Assignment1Controller.Java

@PropertySource(ignoreResourceNotFound = true, value = "classpath:assignment1.properties")
@RestController  
public class Assignment1Controller {

//  @Autowired
//  Assignment1Services assignment1Services;
    @Value("${app.title}")
    private String appTitle;
     @RequestMapping(value = "/hello")  
        public String getValues() {

          return appTitle;

        }  

}

assignment1.properties

app.title=Learning Spring

Answer 4

Deleting or corrupting the pom.xml file can cause this error.

Answer 5

You can also try default values. spring-value-annotation

Default values can be provided for properties that might not be defined. In this example the value “some default” will be injected:

@Value("${unknown.param:some default}")
private String someDefault;

If the same property is defined as a system property and in the properties file, then the system property would be applied.

Answer 6

I got the same error in my microservice project.The property itself missed in my yml file.So I added property name and value that resolves my problem