BAEL-2855 Add a new section in ConfigurationProperties article (#6808)

spring-boot/src/main/java/org/baeldung/properties/ConfigProperties.java

@@ -9,6 +9,7 @@ import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.Pattern;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.validation.annotation.Validated;
@@ -80,4 +81,10 @@ public class ConfigProperties {
     public void setCredentials(Credentials credentials) {
         this.credentials = credentials;
     }
+
+    @Bean
+    @ConfigurationProperties(prefix = "item")
+    public Item item(){
+        return new Item();
+    }
 }

spring-boot/src/main/java/org/baeldung/properties/Item.java

@@ -0,0 +1,31 @@
+package org.baeldung.properties;
+
+public class Item {
+
+    private String name;
+    private int size;
+
+    public Item() {
+    }
+
+    public Item(String name, int size) {
+        this.name = name;
+        this.size = size;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public void setSize(int size) {
+        this.size = size;
+    }
+}

spring-boot/src/main/resources/configprops.properties

@@ -17,4 +17,8 @@ mail.credentials.username=john
 mail.credentials.password=password
 mail.credentials.authMethod=SHA1
 
+#Bean method properties
+item.name=Item name
+item.size=42
+
 

spring-boot/src/test/java/org/baeldung/properties/ConfigPropertiesIntegrationTest.java

@@ -53,4 +53,11 @@ public class ConfigPropertiesIntegrationTest {
         Assert.assertEquals("Incorrectly bound object property, username", "john", credentials.getUsername());
         Assert.assertEquals("Incorrectly bound object property, password", "password", credentials.getPassword());
     }
+
+    @Test
+    public void whenBeanMethodAnnotatedThenPropertiesCorrectlyBound(){
+        Item item = properties.item();
+        Assert.assertEquals("Incorrectly bound object property, item.name","Test item name", item.getName());
+        Assert.assertEquals("Incorrectly bound object property, item.size", 21, item.getSize());
+    }
 }

spring-boot/src/test/resources/configprops-test.properties

@@ -17,3 +17,6 @@ mail.credentials.username=john
 mail.credentials.password=password
 mail.credentials.authMethod=SHA1
 
+#Bean method properties
+item.name=Test item name
+item.size=21