[static-injection] improvement

spring-di-2/src/main/java/com/baeldung/staticvalue/injection/Application.java

@@ -1,17 +0,0 @@
-package com.baeldung.staticvalue.injection;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
-import org.springframework.context.annotation.PropertySource;
-
-@SpringBootApplication(exclude={DataSourceAutoConfiguration.class})
-@PropertySource("/application.properties")
-
-public class Application {
-
-	public static void main(String[] args) {
-		SpringApplication.run(Application.class, args);
-	}
-
-}

spring-di-2/src/main/java/com/baeldung/staticvalue/injection/PropertyController.java

@@ -1,30 +0,0 @@
-package com.baeldung.staticvalue.injection;
-
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-import java.util.Arrays;
-import java.util.List;
-
-@RestController
-public class PropertyController {
-
-    @Value("${name}")
-    private String name;
-
-    @Value("${name}")
-    private static String NAME_NULL;
-
-    private static String NAME_STATIC;
-
-    @Value("${name}")
-    public void setNameStatic(String name){
-        PropertyController.NAME_STATIC = name;
-    }
-
-    @GetMapping("/properties")
-    public List<String> getProperties(){
-        return Arrays.asList(this.name, NAME_STATIC, NAME_NULL)  ;
-    }
-}

spring-di-2/src/main/java/com/baeldung/staticvalueinjection/StaticPropertyHolder.java

@@ -0,0 +1,26 @@
+package com.baeldung.staticvalueinjection;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class StaticPropertyHolder {
+
+    @Value("${name}")
+    private static String STATIC_NAME_INJECTED_ON_FIELD;
+
+    private static String STATIC_NAME;
+
+    @Value("${name}")
+    public void setStaticName(String name) {
+        STATIC_NAME = name;
+    }
+
+    public static String getStaticName() {
+        return STATIC_NAME;
+    }
+
+    public static String getStaticNameInjectedOnField() {
+        return STATIC_NAME_INJECTED_ON_FIELD;
+    }
+}

spring-di-2/src/main/resources/application.properties

@@ -1 +1 @@
-name = Inject a value to a static field
+name = Inject a value to a static field

spring-di-2/src/test/java/com/baeldung/staticvalueinjection/StaticPropertyHolderUnitTest.java

@@ -0,0 +1,18 @@
+package com.baeldung.staticvalueinjection;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest(classes = StaticPropertyHolder.class)
+public class StaticPropertyHolderUnitTest {
+
+    @Test
+    public void givenStaticPropertyInSpringBean_WhenUsingValueOnSetter_ThenValueInjected() {
+        assertNull(StaticPropertyHolder.getStaticNameInjectedOnField());
+        assertEquals("Inject a value to a static field", StaticPropertyHolder.getStaticName());
+    }
+
+}