Spring How to inject a value to static field

Question

With this class   Component public class Sample         Value    my name        public static String name        If I try Sample name  it is always  null   So I tried this   public class Sample        public static String name        PostConstruct     public void init            name   privateName              Value    my name        private String privateName       public String getPrivateName             return privateName             public void setPrivateName String privateName            this privateName   privateName               This code works  Sample name is set properly  Is this good way or not  If not  is there something more good way  And how to do it

User · Answer

This is my sample code for load static variable import org springframework beans factory annotation Autowired  import org springframework beans factory annotation Value  import org springframework stereotype Component    Component public class OnelinkConfig       public static int MODULE CODE      public static int DEFAULT PAGE      public static int DEFAULT SIZE        Autowired     public void loadOnelinkConfig  Value  quot   onelink config exception module code  quot   int code               Value  quot   onelink config default page  quot   int page   Value  quot   onelink config default size  quot   int size            MODULE CODE   code          DEFAULT PAGE   page          DEFAULT SIZE   size

User · Answer

First of all  public static non-final fields are evil  Spring does not allow injecting to such fields for a reason   Your workaround is valid  you don t even need getter setter  private field is enough  On the other hand try this    Value    my name    public void setPrivateName String privateName        Sample name   privateName         works with  Autowired  Resource   But to give you some constructive advice  Create a second class with private field and getter instead of public static field

User · Answer

Spring uses dependency injection to populate the specific value when it finds the  Value annotation  However  instead of handing the value to the instance variable  it s handed to the implicit setter instead  This setter then handles the population of our NAME STATIC value        RestController    or if you want to declare some specific use of the properties file then use    Configuration    PropertySource   classpath application-  youeEnvironment  properties    public class PropertyController         Value    name     not necessary     private String name   not necessary      private static String NAME STATIC        Value    name        public void setNameStatic String name           PropertyController NAME STATIC   name

[spring] Spring: How to inject a value to static field?

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