[BAEL-5248] Lombok Configuration System (#11599)

* [BAEL-5248] Initial code examples

* Add missing examples

lombok/lombok.config

@@ -0,0 +1,8 @@
+import lombok_feature.config
+
+config.stopBubbling = true
+lombok.anyconstructor.addconstructorproperties=false
+lombok.addLombokGeneratedAnnotation = true
+lombok.addSuppressWarnings = false
+
+

lombok/lombok_feature.config

@@ -0,0 +1 @@
+lombok.experimental.flagUsage = warning

lombok/pom.xml

@@ -26,6 +26,11 @@
             <artifactId>hibernate-jpa-2.1-api</artifactId>
             <version>${hibernate-jpa-2.1-api.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.jetbrains</groupId>
+            <artifactId>annotations</artifactId>
+            <version>23.0.0</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -70,7 +75,7 @@
         <!-- various -->
         <hibernate-jpa-2.1-api.version>1.0.0.Final</hibernate-jpa-2.1-api.version>
         <!-- delombok maven plugin -->
-        <delombok-maven-plugin.version>1.18.10.0</delombok-maven-plugin.version>
+        <delombok-maven-plugin.version>1.18.20.0</delombok-maven-plugin.version>
     </properties>
 
 </project>

lombok/src/main/java/com/baeldung/lombok/configexamples/Account.java

@@ -0,0 +1,40 @@
+package com.baeldung.lombok.configexamples;
+
+import lombok.*;
+import lombok.extern.java.Log;
+
+import java.util.logging.Level;
+
+import static java.lang.Math.abs;
+
+@NoArgsConstructor
+@AllArgsConstructor
+@Getter
+@Setter
+@Log
+public class Account {
+
+    @NonNull
+    private Double balance = 0.;
+    @NonNull
+    private String accountHolder = "";
+
+    public Account addBalance(double amount) {
+        if (amount < 0) {
+            throw new IllegalArgumentException("Can not add negative amount");
+        }
+
+        this.balance += amount;
+        return this;
+    }
+
+    public Account withdraw(double amount) {
+        if (this.balance - abs(amount) < 0) {
+            domainLog.log(Level.INFO, String.format("Transaction denied for account holder: %s", this.accountHolder));
+            throw new IllegalArgumentException(String.format("Not enough balance, you have %.2f", this.balance));
+        }
+
+        this.balance -= abs(amount);
+        return this;
+    }
+}

lombok/src/main/java/com/baeldung/lombok/configexamples/TransactionLog.java

@@ -0,0 +1,13 @@
+package com.baeldung.lombok.configexamples;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.experimental.Accessors;
+
+@AllArgsConstructor
+@Getter
+@Accessors(prefix = {"op"})
+public class TransactionLog {
+    double amount;
+    String description;
+}

lombok/src/main/java/com/baeldung/lombok/configexamples/lombok.config

@@ -0,0 +1,6 @@
+clear lombok.experimental.flagUsage
+
+lombok.anyconstructor.addconstructorproperties=true
+lombok.addNullAnnotations = jetbrains
+lombok.accessors.chain = true
+lombok.log.fieldName = domainLog

lombok/src/test/java/com/baeldung/lombok/configexamples/AccountUnitTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.lombok.configexamples;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class AccountUnitTest {
+
+    @Test
+    void should_initialize_account() {
+        Account myAccount = new Account()
+            .setBalance(2000.00)
+            .setAccountHolder("John Snow");
+
+        assertEquals(2000.00, myAccount.getBalance());
+        assertEquals("John Snow", myAccount.getAccountHolder());
+    }
+
+    @Test
+    void should_throw_error_when_balance_becomes_negative() {
+        Account myAccount = new Account()
+            .setBalance(20.00)
+            .setAccountHolder("John Snow");
+
+        assertThrows(IllegalArgumentException.class, () -> myAccount.withdraw(100.00));
+    }
+
+    @Test
+    void should_throw_no_error_when_balance_becomes_zero() {
+        Account myAccount = new Account()
+            .setBalance(20.00)
+            .setAccountHolder("John Snow");
+
+        myAccount.withdraw(20.00);
+
+        assertEquals(0.00, myAccount.getBalance());
+    }
+
+    @Test
+    void should_update_balance_properly() {
+        Account myAccount = new Account()
+            .setBalance(20.00)
+            .setAccountHolder("John Snow");
+
+        myAccount.withdraw(5.00).withdraw(10.00);
+
+        assertEquals(5.00, myAccount.getBalance());
+    }
+}