Spring application shut down at startup - spring

Question

I have this strange behaviour with my spring boot application where suddently the startup process doesn't work anymore. Here's the all the log:
I really can't say what's wrong since it stopped working. I also fetched on git the remote version of the code that is deployed and working right now. I use Intellij Idea as IDE, I have already restarted the IDE and the laptop.
I looked over the Internet but everyone having this issue has problems abot pom or dependency. I can't get a clue from the logs. Thanks in advance.
EDIT: Here is my pom.xml
<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>
<parent>
<groupId>it.reag</groupId>
<artifactId>reag-common-api</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>reag-mailsender-batch</artifactId>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>it.reag</groupId>
<artifactId>reag-common-api-model</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>mssql-jdbc</artifactId>
<version>6.1.0.jre8</version>
</dependency>
</dependencies>
<build>
<finalName>MailSenderBatch</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Note that if I change the spring-boot-starter dependency with spring-boot-starter-web the app works, but I don't understand why. I don't use any of the feature of web environment. Also, it worked perfectly until the other day with the spring-boot-starter dependency.

Answer 1

Leaving this answer as it may help others. If one defines a parent in pom like you have here:
<parent>
<groupId>it.reag</groupId>
<artifactId>reag-common-api</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
Then a simple dependency of spring-boot-starter-web in this module pom may not be the same as you expected, it may be customized in parent, aka reag-common-api pom, servlet container may be removed there. This happens because of dependency hierachy rule in maven. In this way, in order to verify that a missing container is the reason why spring application starts and quits, one can use mvn dependency:tree to see if a tomcat or undertow or netty is shown as a container (not an exact expression).
In my project, this would be neede for submodule pom:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-undertow</artifactId>
</dependency>
As its parent has this:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring-boot.version}</version>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>