Spring boot making deployable WAR file - spring

Question

I am using Spring boot and Spring JPA Data to build a web application.
The application works fine, but when I try to make WAR file to deploy it inside Tomcat 8 web server, I get these errors
Here is my Spring boot start class
#SpringBootApplication
public class SpringBootWebApplication extends SpringBootServletInitializer {
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder
application) {
return application.sources(SpringBootWebApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(SpringBootWebApplication.class, args);
}
}
and here is my POM file :
<?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>
<groupId>guru.springframework</groupId>
<artifactId>spring-boot-web</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Spring Boot Web Application</name>
<description>Spring Boot Web Application</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<!--<start-class>guru.springframework.SpringBootWebApplication </start-class>-->
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<!--<dependency>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-starter-thymeleaf</artifactId>-->
<!--</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--WebJars-->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.4</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>2.1.4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>LATEST</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-ldap</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-openid</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<!-- hot swapping, disable cache for template, enable live reload -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<finalName>Mobl</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.5.1.RELEASE</version>
</plugin>
</plugins>
</build>
and IntelliJ Idea gives me these Errors :
Error:java: com.sun.tools.javac.code.Symbol$CompletionFailure: class file
for groovy.lang.Closure not found
Error:java: java.lang.RuntimeException:
com.sun.tools.javac.code.Symbol$CompletionFailure: class file for
groovy.lang.Closure not found

Answer 1

Spring Boot already contains a Tomcat container inside it, so your generated JAR file is executable.
Thankfully, Spring authors thought about some ppl still want to deploy Spring Boot apps into an individual container. Please follow this link for further info.
You need to configure the Maven/Gradle plugin to generate WAR instead of a JAR.
Edit: I just saw that you already have the configuration. If your application is working fine outside of IntelliJ then the issue might be that IntelliJ recognizes your application as a Spring Boot app and tries to run the JAR instead of deploying the WAR file as I think IntelliJ is not prepared for this case. You might have to write a custom configuration for it.