Code for BAEL-1812 (#4432)

* Thin jar option for Spring Boot bootstrap and gradle projects.

* .gitignore for spring-boot-gradle project.

* Maven and Gradle 'thin' Boot builds (optional)

* Rename 'wrapper' to 'thin' and shorten some lines of code to fit the article.

parent-boot-2/pom.xml

@@ -105,6 +105,25 @@
                 </plugins>
             </build>
         </profile>
+        <profile>
+            <id>thin-jar</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.springframework.boot</groupId>
+                        <artifactId>spring-boot-maven-plugin</artifactId>
+                        <dependencies>
+                            <!-- The following enables the "thin jar" deployment option. -->
+                            <dependency>
+                                <groupId>org.springframework.boot.experimental</groupId>
+                                <artifactId>spring-boot-thin-layout</artifactId>
+                                <version>${thin.version}</version>
+                            </dependency>
+                        </dependencies>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
     </profiles>
 
     <properties>
@@ -115,6 +134,7 @@
         <!-- plugins -->
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
+        <thin.version>1.0.11.RELEASE</thin.version>
     </properties>
 
 </project>