JAVA-30632 Upgrade spring-resttemplate module to Spring Boot 3 (#15713)

* JAVA-30632 upgrade Spring rest template module to Spring Boot 3

* JAVA-30632 fix broken tests

spring-web-modules/spring-resttemplate/.gitignore

@@ -1,13 +0,0 @@
-*.class
-
-#folders#
-/target
-/neoDb*
-/data
-/src/main/webapp/WEB-INF/classes
-*/META-INF/*
-
-# Packaged files #
-*.jar
-*.war
-*.ear

spring-web-modules/spring-resttemplate/pom.xml

@@ -10,71 +10,20 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-boot-2</artifactId>
+        <artifactId>parent-boot-3</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-boot-2</relativePath>
+        <relativePath>../../parent-boot-3</relativePath>
     </parent>
 
     <dependencies>
         <!-- Spring Boot Dependencies -->
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-actuator</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-thymeleaf</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-devtools</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>au.com.dius</groupId>
-            <artifactId>pact-jvm-provider-junit5_2.12</artifactId>
-            <version>${pact.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>au.com.dius</groupId>
-            <artifactId>pact-jvm-consumer-junit5_2.12</artifactId>
-            <version>${pact.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <!-- Spring -->
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-web</artifactId>
-            <exclusions>
-                <exclusion>
-                    <artifactId>commons-logging</artifactId>
-                    <groupId>commons-logging</groupId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-webmvc</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-oxm</artifactId>
-        </dependency>
-        <!-- marshalling -->
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-databind</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>com.fasterxml.jackson.dataformat</groupId>
-            <artifactId>jackson-dataformat-xml</artifactId>
         </dependency>
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
@@ -100,14 +49,15 @@
         </dependency>
         <!-- test scoped -->
         <dependency>
-            <groupId>org.springframework</groupId>
+            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-test</artifactId>
+            <artifactId>spring-boot-starter-test</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-junit-jupiter</artifactId>
-            <version>${mockito.version}</version>
             <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.junit.vintage</groupId>
+                    <artifactId>junit-vintage-engine</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
     </dependencies>
 
@@ -120,14 +70,13 @@
             </resource>
         </resources>
         <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven.version}</version>
-                <configuration>
-                    <source>${source.version}</source>
-                    <target>${target.version}</target>
-                </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -254,16 +203,12 @@
     </profiles>
 
     <properties>
-        <xstream.version>1.4.9</xstream.version>
+        <xstream.version>1.4.20</xstream.version>
         <!-- Maven plugins -->
         <cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>
         <findbugs-maven-plugin.version>3.0.4</findbugs-maven-plugin.version>
         <!-- okhttp -->
         <com.squareup.okhttp3.version>4.12.0</com.squareup.okhttp3.version>
-        <pact.version>3.6.3</pact.version>
-        <source.version>1.8</source.version>
-        <target.version>1.8</target.version>
-        <maven.version>3.7.0</maven.version>
     </properties>
 
 </project>

spring-web-modules/spring-resttemplate/src/main/java/com/baeldung/resttemplate/configuration/SpringConfig.java

@@ -7,7 +7,6 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.DependsOn;
-import org.springframework.web.client.RestTemplate;
 
 @Configuration
 @EnableAutoConfiguration

spring-web-modules/spring-resttemplate/src/main/java/com/baeldung/resttemplate/web/handler/RestTemplateResponseErrorHandler.java

@@ -2,40 +2,32 @@ package com.baeldung.resttemplate.web.handler;
 
 import java.io.IOException;
 
-import com.baeldung.resttemplate.web.exception.NotFoundException;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.stereotype.Component;
 import org.springframework.web.client.HttpClientErrorException;
 import org.springframework.web.client.ResponseErrorHandler;
 
+import com.baeldung.resttemplate.web.exception.NotFoundException;
+
 @Component
-public class RestTemplateResponseErrorHandler
+public class RestTemplateResponseErrorHandler implements ResponseErrorHandler {
-    implements ResponseErrorHandler {
 
     @Override
-    public boolean hasError(ClientHttpResponse httpResponse)
+    public boolean hasError(ClientHttpResponse httpResponse) throws IOException {
-        throws IOException {
+        return httpResponse.getStatusCode()
-
+            .is5xxServerError() || httpResponse.getStatusCode()
-        return (httpResponse
+            .is4xxClientError();
-          .getStatusCode()
-          .series() == HttpStatus.Series.CLIENT_ERROR || httpResponse
-          .getStatusCode()
-          .series() == HttpStatus.Series.SERVER_ERROR);
     }
 
     @Override
-    public void handleError(ClientHttpResponse httpResponse)
+    public void handleError(ClientHttpResponse httpResponse) throws IOException {
-        throws IOException {
+        if (httpResponse.getStatusCode()
-
+            .is5xxServerError()) {
-        if (httpResponse
-          .getStatusCode()
-          .series() == HttpStatus.Series.SERVER_ERROR) {
             //Handle SERVER_ERROR
             throw new HttpClientErrorException(httpResponse.getStatusCode());
-        } else if (httpResponse
+        } else if (httpResponse.getStatusCode()
-          .getStatusCode()
+            .is4xxClientError()) {
-          .series() == HttpStatus.Series.CLIENT_ERROR) {
             //Handle CLIENT_ERROR
             if (httpResponse.getStatusCode() == HttpStatus.NOT_FOUND) {
                 throw new NotFoundException();

spring-web-modules/spring-resttemplate/src/main/java/com/baeldung/sampleapp/web/controller/MyFooController.java

@@ -4,7 +4,7 @@ import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
 
-import javax.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpServletResponse;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Controller;

spring-web-modules/spring-resttemplate/src/test/java/com/baeldung/mock/EmployeeServiceUnitTest.java

@@ -1,5 +1,7 @@
 package com.baeldung.mock;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -18,8 +20,6 @@ import com.baeldung.resttemplate.web.model.Employee;
 @ExtendWith(MockitoExtension.class) 
 public class EmployeeServiceUnitTest {
 
-    private static final Logger logger = LoggerFactory.getLogger(EmployeeServiceUnitTest.class);
-
     @Mock
     private RestTemplate restTemplate;
 
@@ -34,7 +34,6 @@ public class EmployeeServiceUnitTest {
 
         Employee employee = empService.getEmployee("E001");
 
-        Assertions.assertEquals(emp, employee);
+        assertEquals(emp, employee);
     }
-
 }

spring-web-modules/spring-resttemplate/src/test/java/com/baeldung/resttemplate/RestTemplateBasicLiveTest.java

@@ -1,6 +1,6 @@
 package com.baeldung.resttemplate;
 
-import static org.apache.commons.codec.binary.Base64.encodeBase64;
+import java.util.Base64;
 import static com.baeldung.client.Consts.APPLICATION_PORT;
 import static org.junit.jupiter.api.Assertions.fail;
 
@@ -32,7 +32,7 @@ import org.springframework.web.client.RestTemplate;
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+import org.springframework.web.client.RestTemplate;
 import com.google.common.base.Charsets;
 
 // This test needs RestTemplateConfigurationApplication to be up and running
@@ -62,7 +62,7 @@ public class RestTemplateBasicLiveTest {
         final RestTemplate template = new RestTemplate();
         final ResponseEntity<String> response = template.getForEntity(fooResourceUrl + "/1", String.class);
 
-        final ObjectMapper mapper = new XmlMapper();
+        final ObjectMapper mapper = new ObjectMapper();
         final JsonNode root = mapper.readTree(response.getBody());
         final JsonNode name = root.path("name");
         Assertions.assertNotNull(name.asText());
@@ -243,7 +243,7 @@ public class RestTemplateBasicLiveTest {
 
     private String getBase64EncodedLogPass() {
         final String logPass = "user1:user1Pass";
-        final byte[] authHeaderBytes = encodeBase64(logPass.getBytes(Charsets.US_ASCII));
+        final byte[] authHeaderBytes = Base64.getEncoder().encode(logPass.getBytes(Charsets.US_ASCII));
         return new String(authHeaderBytes, Charsets.US_ASCII);
     }