Java 8 to Java 11 Migration

.github/workflows/java11-build.yml

@@ -0,0 +1,27 @@
+name: Java 11 Build
+
+on:
+  push:
+    branches: [ DevOps, main, master ]
+  pull_request:
+    branches: [ DevOps, main, master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup JDK 11
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '11'
+          cache: maven
+
+      - name: Build with Maven
+        run: mvn -B -e -DskipTests clean verify
+
+      - name: Run Tests
+        run: mvn -B test

MIGRATION_NOTES.md

@@ -0,0 +1,70 @@
+# Java 8 to Java 11 Migration Notes
+
+This document summarizes the changes made to migrate the Springboot-BankApp from Java 8 to Java 11.
+
+## Summary of Changes
+
+### Build Configuration (pom.xml)
+
+The following changes were made to support Java 11:
+
+**Spring Boot Version**: Downgraded from 3.3.3 to 2.7.18 (LTS) because Spring Boot 3.x requires Java 17+, while Spring Boot 2.7.x supports Java 8-17.
+
+**Java Version**: Updated from Java 8 to Java 11 using the `<release>11</release>` configuration in maven-compiler-plugin.
+
+**Maven Plugins Updated**:
+- maven-compiler-plugin: 3.11.0 (with `<release>11</release>`)
+- maven-surefire-plugin: 3.2.5
+- maven-failsafe-plugin: 3.2.5
+- maven-enforcer-plugin: 3.5.0 (enforces Java 11+ requirement)
+
+**Dependencies Changed**:
+- thymeleaf-extras-springsecurity6 -> thymeleaf-extras-springsecurity5 (Spring Security 5 for Spring Boot 2.7.x)
+- Added H2 database for testing (test scope)
+
+### Source Code Changes
+
+**Model Classes (Account.java, Transaction.java)**:
+- Changed `jakarta.persistence.*` imports to `javax.persistence.*` (Jakarta EE namespace is used in Spring Boot 3.x, Java EE namespace in Spring Boot 2.7.x)
+- Added UserDetails interface methods to Account.java: `isAccountNonExpired()`, `isAccountNonLocked()`, `isCredentialsNonExpired()`, `isEnabled()`
+
+**SecurityConfig.java**:
+- Updated from Spring Security 6 lambda DSL to Spring Security 5 method chaining style
+- Changed `requestMatchers()` to `antMatchers()`
+- Changed `authorizeHttpRequests()` to `authorizeRequests()`
+- Updated logout, formLogin, and headers configuration to use `.and()` chaining
+
+### Configuration Changes
+
+**application.properties**:
+- Changed Hibernate dialect from `MySQL8Dialect` to `MySQL57Dialect` for Hibernate 5 compatibility
+
+**Test Configuration**:
+- Added `src/test/resources/application.properties` with H2 in-memory database configuration for testing
+
+### CI/CD
+
+**GitHub Actions**:
+- Added `.github/workflows/java11-build.yml` workflow for JDK 11 builds
+- Uses Temurin JDK 11 distribution
+- Includes Maven caching for faster builds
+
+## Validation
+
+- Build compiles successfully with Java 11
+- All tests pass with H2 in-memory database
+- Maven enforcer plugin ensures Java 11+ is required
+
+## Known Considerations
+
+1. **Database Compatibility**: The application uses MySQL in production. The test configuration uses H2 for CI/CD compatibility.
+
+2. **Spring Security**: Using Spring Security 5 method chaining style. Some methods are deprecated but functional.
+
+3. **Hibernate Dialect**: Using MySQL57Dialect which is compatible with MySQL 5.7+ and MySQL 8.x.
+
+## Future Considerations
+
+- Consider upgrading to Spring Boot 3.x with Java 17+ for long-term support
+- Consider migrating to Jakarta EE namespace when upgrading to Spring Boot 3.x
+- Consider using Spring Security 6 lambda DSL when upgrading to Spring Boot 3.x

README.md

@@ -1,6 +1,13 @@
 ## End-to-End Bank Application Deployment using DevSecOps on AWS EKS
 - This is a multi-tier bank an application written in Java (Springboot).
 
+## Requirements
+- **Java 11** (JDK 11 or higher) - This application requires Java 11 to build and run
+- **Maven 3.6+** - For building the application
+- **MySQL 5.7+** - For the database
+
+See [MIGRATION_NOTES.md](MIGRATION_NOTES.md) for details on the Java 8 to Java 11 migration.
+
 ![Login diagram](images/login.png)
 ![Transactions diagram](images/transactions.png)
 

pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.3.3</version>
+		<version>2.7.18</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>com.example</groupId>
@@ -27,7 +27,9 @@
 		<url/>
 	</scm>
 	<properties>
-		<java.version>17</java.version>
+		<java.version>11</java.version>
+		<maven.compiler.release>11</maven.compiler.release>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<dependencies>
 		<dependency>
@@ -48,7 +50,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.thymeleaf.extras</groupId>
-			<artifactId>thymeleaf-extras-springsecurity6</artifactId>
+			<artifactId>thymeleaf-extras-springsecurity5</artifactId>
 		</dependency>
 
 		<dependency>
@@ -67,9 +69,53 @@
 			<artifactId>spring-security-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 	<build>
+		<pluginManagement>
+			<plugins>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-compiler-plugin</artifactId>
+					<version>3.11.0</version>
+					<configuration>
+						<release>11</release>
+					</configuration>
+				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-surefire-plugin</artifactId>
+					<version>3.2.5</version>
+				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-failsafe-plugin</artifactId>
+					<version>3.2.5</version>
+				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-enforcer-plugin</artifactId>
+					<version>3.5.0</version>
+					<executions>
+						<execution>
+							<goals><goal>enforce</goal></goals>
+							<configuration>
+								<rules>
+									<requireJavaVersion>
+										<version>[11,)</version>
+									</requireJavaVersion>
+								</rules>
+							</configuration>
+						</execution>
+					</executions>
+				</plugin>
+			</plugins>
+		</pluginManagement>
 		<plugins>
 			<plugin>
 				<groupId>org.springframework.boot</groupId>
@@ -78,11 +124,10 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.8.0</version>
-				<configuration>
-    					<source>1.8</source>
-    					<target>1.8</target>
-				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-enforcer-plugin</artifactId>
 			</plugin>
 		</plugins>
 	</build>

src/main/java/com/example/bankapp/config/SecurityConfig.java

@@ -27,27 +27,26 @@ public static PasswordEncoder passwordEncoder() {
     @Bean
     public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
         http
-                .csrf(csrf -> csrf.disable())
-                .authorizeHttpRequests(authz -> authz
-                        .requestMatchers("/register").permitAll()
+                .csrf().disable()
+                .authorizeRequests()
+                        .antMatchers("/register").permitAll()
                         .anyRequest().authenticated()
-                )
-                .formLogin(form -> form
+                .and()
+                .formLogin()
                         .loginPage("/login")
                         .loginProcessingUrl("/login")
                         .defaultSuccessUrl("/dashboard", true)
                         .permitAll()
-                )
-                .logout(logout -> logout
+                .and()
+                .logout()
                         .invalidateHttpSession(true)
                         .clearAuthentication(true)
                         .logoutRequestMatcher(new AntPathRequestMatcher("/logout"))
                         .logoutSuccessUrl("/login?logout")
                         .permitAll()
-                )
-                .headers(headers -> headers
-                        .frameOptions(frameOptions -> frameOptions.sameOrigin())
-                );
+                .and()
+                .headers()
+                        .frameOptions().sameOrigin();
 
         return http.build();
     }
@@ -57,4 +56,4 @@ public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception
         auth.userDetailsService(accountService).passwordEncoder(passwordEncoder());
 
     }
-}
+}

src/main/java/com/example/bankapp/model/Account.java

@@ -1,6 +1,6 @@
 package com.example.bankapp.model;
 
-import jakarta.persistence.*;
+import javax.persistence.*;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;
 
@@ -84,4 +84,24 @@ public List<Transaction> getTransactions() {
     public void setTransactions(List<Transaction> transactions) {
         this.transactions = transactions;
     }
+
+    @Override
+    public boolean isAccountNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isAccountNonLocked() {
+        return true;
+    }
+
+    @Override
+    public boolean isCredentialsNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return true;
+    }
 }

src/main/java/com/example/bankapp/model/Transaction.java

@@ -1,6 +1,6 @@
 package com.example.bankapp.model;
 
-import jakarta.persistence.*;
+import javax.persistence.*;
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
 

src/main/resources/application.properties

@@ -7,5 +7,5 @@ spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
 
 # JPA & Hibernate configuration
 spring.jpa.hibernate.ddl-auto=update
-spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL57Dialect
 spring.jpa.show-sql=true

src/test/resources/application.properties

@@ -0,0 +1,12 @@
+spring.application.name=bankapp
+
+# H2 Database configuration for testing
+spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=
+
+# JPA & Hibernate configuration for testing
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.jpa.hibernate.ddl-auto=create-drop
+spring.jpa.show-sql=true