Use "return" instead of "exit" where possible, especially in
function definitions.
Also fixed the exit codes to match the LSB spec for some specific
conditions (fixes gh-3521).
Fixes gh-3199, fixes gh-3535
The following java samples are provided:
* link:spring-boot-sample-simple[spring-boot-sample-simple]
-- A simple command line application
* link:spring-boot-sample-tomcat[spring-boot-sample-tomcat]
-- Embedded Tomcat
* link:spring-boot-sample-jetty[spring-boot-sample-jetty]
-- Embedded Jetty
* link:spring-boot-sample-activemq[spring-boot-sample-activemq]
-- Simple JMS consumer and producer using Apache ActiveMQ
* link:spring-boot-sample-actuator[spring-boot-sample-actuator]
-- Simple REST service with production features
* link:spring-boot-sample-actuator-ui[spring-boot-sample-actuator-ui]
-- A web UI example with production features
* link:spring-boot-sample-actuator-noweb[spring-boot-sample-actuator-noweb]
-- A production features sample with no web application
* link:spring-boot-sample-actuator-log4j[spring-boot-sample-actuator-log4j]
-- A production features sample using log4j for logging (instead of logback)
* link:spring-boot-sample-cache-ehcache[spring-boot-sample-cache]
-- A web sample that uses Spring's cache abstraction
* link:spring-boot-sample-web-ui[spring-boot-sample-web-ui]
-- A thymeleaf web application
* link:spring-boot-sample-web-static[spring-boot-sample-web-static]
-- A web application serving static files
* link:spring-boot-sample-web-freemarker[spring-boot-sample-web-freemarker]
-- A web application using Freemarker templates
* link:spring-boot-sample-web-velocity[spring-boot-sample-web-velocity]
-- A web application using Velocity templates
* link:spring-boot-sample-web-groovy-templates[spring-boot-sample-web-groovy-templates]
-- A web application using native Groovy templates
* link:spring-boot-sample-web-jsp[spring-boot-sample-web-jsp]
-- A web application using JSP templates
* link:spring-boot-sample-web-tomcat8-jsp[spring-boot-sample-tomcat8-jsp]
-- A web application using JSP templates with Tomcat 8
* link:spring-boot-sample-web-tomcat-multi-connectors[spring-boot-sample-tomcat-multi-connectors]
-- A web application using multiple connectors in tomcat, showing how to customize the Tomcat server
* link:spring-boot-sample-web-secure[spring-boot-sample-web-secure]
-- A web application with typical Security configuration enabling a login form
* link:spring-boot-sample-web-method-security[spring-boot-sample-web-method-security]
-- A web application with Security configuration enabling global method security
* link:spring-boot-sample-secure[spring-boot-sample-secure]
-- example showing Spring Security in a non-web application
* link:spring-boot-sample-servlet[spring-boot-sample-servlet]
-- example showing a "raw" `Servlet` returning plaintext content
* link:spring-boot-sample-ws[spring-boot-sample-ws]
-- A simple contract-first SOAP web service with Spring Web Services
* link:spring-boot-sample-websocket[spring-boot-sample-websocket]
-- A web application with Websocket support on the client and server
* link:spring-boot-sample-flyway[spring-boot-sample-flyway]
-- Example showing database migrations with Flyway
* link:spring-boot-sample-liquibase[spring-boot-sample-liquibase]
-- Example showing database migrations with Liquibase
* link:spring-boot-sample-amqp[spring-boot-sample-amqp]
-- Example showing message-oriented application using RabbitMQ
* link:spring-boot-sample-hornetq[spring-boot-sample-hornetq]
-- Example showing message-oriented application using HornetQ
* link:spring-boot-sample-batch[spring-boot-sample-batch]
-- Define and run a Batch job in a few lines of code
* link:spring-boot-sample-data-jpa[spring-boot-sample-data-jpa]
-- Spring Data JPA + Hibernate + HSQLDB
* link:spring-boot-sample-data-mongodb[spring-boot-sample-data-mongodb]
-- Spring Data Mongo repositories
* link:spring-boot-sample-data-solr[spring-boot-sample-data-solr]
-- Spring Data Solr repositories
* link:spring-boot-sample-data-redis[spring-boot-sample-data-redis]
-- Simple usage of Spring Data Redis
* link:spring-boot-sample-data-rest[spring-boot-sample-data-rest]
-- Crud repositories exposed as REST endpoints
* link:spring-boot-sample-integration[spring-boot-sample-integration]
-- A spring integration application
* link:spring-boot-sample-profile[spring-boot-sample-profile]
-- example showing Spring's `@profile` support
* link:spring-boot-sample-property-validation[spring-boot-sample-property-validation]
-- example showing the usage of `@ConfigurationProperties` with a Spring `Validator`
* link:spring-boot-sample-parent-context[spring-boot-sample-parent-context]
-- example showing an `ApplicationContext` with a parent
* link:spring-boot-sample-aop[spring-boot-sample-aop]
-- shows explicit usage of Spring AOP
* link:spring-boot-sample-traditional[spring-boot-sample-traditional]
-- shows more traditional WAR packaging (but also executable using `java -jar`)
* link:spring-boot-sample-xml[spring-boot-sample-xml]
-- Example show how Spring Boot can be mixed with traditional XML configuration (we
generally recommend using Java `@Configuration` whenever possible)
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