Upgrade to Spring Boot 4 and Spring Framework 7 (#4133)

Changes done:
* Use Jackson2 for our own DispatcherServlet until we fully migrate to Jackson 3
* Test servers are not pausable
* Add certain Spring Boot specific dependencies (e.g. spring-boot-kafka, spring-boot-restclient, etc.). They are needed since Spring Boot 4 changed how their modules look like and the auto configurations are no longer in one single jar. Now there are JARs based on the integration.
* Rewrite the Spring Kafka retry mechanism since it got migrated from Spring Retry to the Spring Core retry. Remove uniform random backoff. The reason for this is the fact that Spring Kafka itself no longer supports it. Remove exponential random backoff. This would be replaced with a jitter, this is a plus / minus value with some randomness that gets applied to the delay.
* Replace deprecated Spring Security AntPathRequestMatcher with the new PathPatternRequestMatcher

Upgraded versions:
* Apache Http Client 5 - 5.5.1
* Jakarta Enterprise CDI - 4.1.0
* Jakarta Enterprise Concurrent - 3.1.1
* Jakarta Persistence - 3.2.0
* Jakarta Servlet - 6.1.0
* Jetty - 12.1.3
* HikariCP - 7.0.2
* Reactor Netty - 1.3.0-RC1
* Spring AMQP - 4.0.0-RC1
* Spring Boot - 4.0.0-RC1
* Spring Kafka - 4.0.0-RC1
* Spring LDAP - 4.0.0-RC1
* Spring Framework - 7.0.0-RC2
* Spring Security - 7.0.0-RC1

Upgraded JDBC Drivers:

* DB2 - 12.1.2.0
* HSQL - 2.7.3
* MariaDB - 3.5.6
* MS SQL - 13.2.1.jre11
* Oracle - 23.9.0.25.07
* Postgres - 42.7.8

Upgraded Test Dependencies:

* AssertJ - 3.27.6
* JsonUnit - 5.0.0
* JUnit Jupiter - 6.0.0
* Mockito - 5.20.0
* Testcontainers - 2.0.1

Upgraded Maven Plugins:
* Maven Surefire - 3.5.4
* Liquibase - 4.33.0

Author: filiphr

modules/flowable-app-engine-rest/pom.xml

@@ -17,7 +17,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <jetty.version>12.0.15</jetty.version>
+        <jetty.version>12.1.3</jetty.version>
         <flowable.artifact>
             org.flowable.app.rest
         </flowable.artifact>

modules/flowable-app-engine-rest/src/test/java/org/flowable/app/rest/DispatcherServletConfiguration.java

@@ -12,13 +12,11 @@
  */
 package org.flowable.app.rest;
 
-import java.util.List;
-
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.HttpMessageConverters;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 import org.springframework.web.multipart.MultipartResolver;
 import org.springframework.web.multipart.support.StandardServletMultipartResolver;
@@ -39,15 +37,8 @@ public MultipartResolver multipartResolver() {
     }
 
     @Override
-    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
-        addDefaultHttpMessageConverters(converters);
-        for (HttpMessageConverter<?> converter : converters) {
-            if (converter instanceof MappingJackson2HttpMessageConverter) {
-                MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = (MappingJackson2HttpMessageConverter) converter;
-                jackson2HttpMessageConverter.setObjectMapper(objectMapper);
-                break;
-            }
-        }
+    protected void configureMessageConverters(HttpMessageConverters.ServerBuilder builder) {
+        builder.jsonMessageConverter(new MappingJackson2HttpMessageConverter(objectMapper));
     }
 
 }

modules/flowable-app-engine-rest/src/test/java/org/flowable/app/rest/util/TestServer.java

@@ -79,6 +79,11 @@ public boolean isRunning() {
         return running;
     }
 
+    @Override
+    public boolean isPauseable() {
+        return false;
+    }
+
     public String getServerUrlPrefix() {
         return "http://localhost:" + server.getURI().getPort() + "/service/";
     }

modules/flowable-app-rest/pom.xml

@@ -752,8 +752,8 @@
         </dependency>
 
         <dependency>
-            <groupId>org.springframework.kafka</groupId>
-            <artifactId>spring-kafka</artifactId>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-kafka</artifactId>
         </dependency>
 
         <dependency>
@@ -778,6 +778,11 @@
             <scope>test</scope>
         </dependency>
         <!-- LDAP dependencies needed for testing purposes -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-ldap</artifactId>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.springframework.ldap</groupId>
             <artifactId>spring-ldap-core</artifactId>
@@ -793,5 +798,16 @@
             <artifactId>json-unit-assertj</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-resttestclient</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 </project>

modules/flowable-app-rest/src/main/java/org/flowable/rest/app/FlowableRestAppEventRegistryCondition.java

@@ -68,19 +68,19 @@ protected Map<String, ConditionOutcome> getConditionOutcomes() {
         Map<String, ConditionOutcome> conditions = new HashMap<>();
 
         if (!jmsEnabled) {
-            conditions.put("org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration",
+            conditions.put("org.springframework.boot.artemis.autoconfigure.ArtemisAutoConfiguration",
                 ConditionOutcome.noMatch("Property flowable.task.app.jms-enabled was not set to true")
             );
         }
 
         if (!kafkaEnabled) {
-            conditions.put("org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration",
+            conditions.put("org.springframework.boot.kafka.autoconfigure.KafkaAutoConfiguration",
                 ConditionOutcome.noMatch("Property flowable.task.app.kafka-enabled was not set to true")
             );
         }
 
         if (!rabbitEnabled) {
-            conditions.put("org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration",
+            conditions.put("org.springframework.boot.amqp.autoconfigure.RabbitAutoConfiguration",
                 ConditionOutcome.noMatch("Property flowable.task.app.rabbit-enabled was not set to true")
             );
         }

modules/flowable-app-rest/src/main/java/org/flowable/rest/app/properties/BackwardsCompatiblePropertiesLoader.java

@@ -19,9 +19,9 @@
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.boot.EnvironmentPostProcessor;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor;
-import org.springframework.boot.env.EnvironmentPostProcessor;
 import org.springframework.core.Ordered;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.MutablePropertySources;

modules/flowable-app-rest/src/main/java/org/flowable/rest/conf/PropertyBasedCorsFilter.java

@@ -34,7 +34,7 @@ public PropertyBasedCorsFilter(RestAppProperties restAppProperties) {
     }
 
     @Override
-    public void configure(HttpSecurity http) throws Exception {
+    public void configure(HttpSecurity http) {
         CorsFilter corsFilter = corsFilter(restAppProperties.getCors());
         http.addFilterBefore(corsFilter, UsernamePasswordAuthenticationFilter.class);
     }

modules/flowable-app-rest/src/main/java/org/flowable/rest/conf/SecurityConfiguration.java

@@ -16,9 +16,9 @@
 import org.flowable.rest.app.properties.RestAppProperties;
 import org.flowable.rest.security.BasicAuthenticationProvider;
 import org.flowable.rest.security.SecurityConstants;
-import org.springframework.boot.actuate.autoconfigure.security.servlet.EndpointRequest;
-import org.springframework.boot.actuate.health.HealthEndpoint;
 import org.springframework.boot.actuate.info.InfoEndpoint;
+import org.springframework.boot.health.actuate.endpoint.HealthEndpoint;
+import org.springframework.boot.security.autoconfigure.actuate.web.servlet.EndpointRequest;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.authentication.AuthenticationProvider;

modules/flowable-app-rest/src/main/resources/META-INF/spring.factories

@@ -1,4 +1,4 @@
-org.springframework.boot.env.EnvironmentPostProcessor=\
+org.springframework.boot.EnvironmentPostProcessor=\
   org.flowable.rest.app.properties.BackwardsCompatiblePropertiesLoader
 
 # Auto Configuration Import Filters

modules/flowable-app-rest/src/test/java/org/flowable/rest/app/FlowableRestApplicationLdapAuthenticationTest.java

@@ -16,8 +16,9 @@
 
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.resttestclient.TestRestTemplate;
+import org.springframework.boot.resttestclient.autoconfigure.AutoConfigureTestRestTemplate;
 import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.test.context.ActiveProfiles;
@@ -27,6 +28,7 @@
  */
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
 @ActiveProfiles("test-ldap")
+@AutoConfigureTestRestTemplate
 public class FlowableRestApplicationLdapAuthenticationTest {
 
     @Autowired