Converting Java DXA Webapp to Spring Boot APP

application.properties

logging.config=classpath:logback.xml

# Multiple-line configuration is possible
# search.solr - Activates SOLR in Search, Not compatible with search.aws
# dynamic.navigation.provider - Dynamic navigation provider to be used instead of static
# adf.context.provider - Activates ADF instead of ContextService
spring.profiles.active=cil.providers.active,search.solr

dxa.properties

#@formatter:off
## You can find the complete list of properties on DXA documentation page.
## This file is an example of how to override DXA properties and configure your DXA application.

dxa.caching.required.caches=defaultCache, pageModels, entityModels, failures

# Disabling ADF results in a significant performance gain,
# but ADF is needed for XPM Session Preview, Experience Optimization and Context Expressions.
dxa.web.adf.enabled=false

dxa.csrf.allowed=true

### ===================================================================================================================
### Model Service client configuration
### ===================================================================================================================
# By default DXA gets the URL of Model Service through Discovery Service. If you are not happy with this for any reason,
# you can specify the URL to your Model Service, which will be used instead.
dxa.model.service.url=http://model-service-url:9082

# Model Service doesn't have its own CIS capability and registers as a part of Content Service. This property sets a key name for the URL in extension properties of CS.
dxa.model.service.key=dxa-model-service

# These four properties set a default mapping of MS REST endpoints. Unless you really know what you're doing, don't change them.
dxa.model.service.url.entity.model=/EntityModel/{uriType}/{localizationId}/{componentId}-{templateId}
dxa.model.service.url.page.model=/PageModel/{uriType}/{localizationId}/{pageUrl}?includes={pageInclusion}
dxa.model.service.url.api.navigation=/api/navigation/{localizationId}
dxa.model.service.url.api.navigation.subtree=/api/navigation/{localizationId}/subtree/{siteMapId}?includeAncestors={includeAncestors}&descendantLevels={descendantLevels}

#@formatter:on

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project
        xmlns="http://maven.apache.org/POM/4.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                      http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <version>2.2.1</version>
    <artifactId>dxaSpringBoot</artifactId>
    <packaging>war</packaging>
    <name>Spring Boot DXA</name>
    <properties>
        <java-version>1.8</java-version>
        <dxa-bom.version>2.2.1</dxa-bom.version>
        <dxaversion>2.2.1</dxaversion>
        <dxa-release-branch>release/2.2</dxa-release-branch>
    </properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.sdl.delivery</groupId>
                <artifactId>udp-iq-api-common</artifactId>
                <version>11.0.0-1049</version>
            </dependency>
            <dependency>
                <groupId>com.sdl.delivery</groupId>
                <artifactId>udp-core</artifactId>
                <version>11.0.0-1044</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.5.21.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <!-- Dependencies -->
        <dependency>
            <groupId>com.sdl.dxa</groupId>
            <artifactId>dxa-common-api</artifactId>
            <version>${dxaversion}</version>
        </dependency>
        <dependency>
            <groupId>com.sdl.dxa</groupId>
            <artifactId>dxa-common</artifactId>
            <version>${dxaversion}</version>
        </dependency>
        <dependency>
            <groupId>com.sdl.dxa</groupId>
            <artifactId>dxa-tridion-provider</artifactId>
            <version>${dxaversion}</version>
        </dependency>
        <dependency>
            <groupId>com.sdl.dxa.modules</groupId>
            <artifactId>dxa-module-core</artifactId>
            <version>${dxaversion}</version>
        </dependency>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20140107</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.9</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.28</version>
        </dependency>
        <!-- Spring Boot -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>1.5.21.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <version>1.5.21.RELEASE</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>8.5.40</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>1.5.21.RELEASE</version>
                <configuration>
                    <executable>true</executable>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                        <configuration>
                            <classifier>spring-boot</classifier>
                            <mainClass>com.sdl.webapp.main.WebAppInitializer</mainClass>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

SpringInitializer.java

package com.sdl.webapp.main;

import com.sdl.dxa.DxaSpringInitialization;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;

@Import(DxaSpringInitialization.class)
@Configuration
public class SpringInitializer {
}

WebAppInitializer.java

package com.sdl.webapp.main;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class WebAppInitializer {
    public static void main(String[] args) {
        SpringApplication.run(WebAppInitializer.class, args);
    }
}