Attribute must be constant when get a value from properties

I am working with Java javax.ws.rs.Path and I am getting the path from the properties. Even though the constant is final static I am the getting Attribute must be constant issue.

This is my how I am getting the value of my constant:

public static final String ENDPOINT_GET =ConfigurationProperties.getInstance().getProperty("someProperty");}

This is the method Implementation:

public String getProperty(String name) {
    return properties.getProperty(name);
  }

But I got this issue, in the other hand if I put this constant in the class directly I don't have this issue.

Any idea?