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How to use Spring Boot BOM, instead of parent?

I need to use BOMs in my project, so simplify the task of managing dependencies. This is the requirement, I cannot pivot at this stage.
I removed parent spring-boot and added AWS, Spring Boot and Junit5 as BOMs. The issue is, even though I have them, dependencies aren't downloaded correctly. Am I missing some plugins or I am doing something else wrong?
I have tried:
Run code without BOMs
Research BOM usage
Run project with parent of Spring Boot
Research similar projects on GitHub
All of the above worked correctly. The issues I am getting after adding BOMs are:
package org.junit.jupiter.api does not exist
package org.mockito does not exist
cannot find symbol
[ERROR] symbol: class ExtendWith
My pom.xml 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>org.example</groupId>
<artifactId>bom-experiments</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<junit-jupiter.version>5.7.2</junit-jupiter.version>
<aws-sdk.version>2.18.16</aws-sdk.version>
<mockito-inline.version>4.8.0</mockito-inline.version>
<org.springframework.boot.version>2.7.5</org.springframework.boot.version>
<org.springframework.version>5.3.24</org.springframework.version>
<lombok.version>1.18.24</lombok.version>
<maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
<maven-surefire-plugin.version>3.0.0-M7</maven-surefire-plugin.version>
<junit-jupiter-params.version>${junit-jupiter.version}</junit-jupiter-params.version>
<kubernetes-maven-plugin.version>1.9.0</kubernetes-maven-plugin.version>
<!-- Plugins -->
<mockito.version>4.9.0</mockito.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-framework-bom</artifactId>
<version>${org.springframework.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${org.springframework.boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>software.amazon.awssdk</groupId>
<artifactId>bom</artifactId>
<version>${aws-sdk.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.junit</groupId>
<artifactId>junit-bom</artifactId>
<version>${junit-jupiter.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-bom</artifactId>
<version>${mockito.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- Secret managers -->
<dependency>
<groupId>software.amazon.awssdk</groupId>
<artifactId>secretsmanager</artifactId>
</dependency>
<dependency>
<groupId>software.amazon.awssdk</groupId>
<artifactId>ssm</artifactId>
</dependency>
<dependency>
<groupId>software.amazon.awssdk</groupId>
<artifactId>sts</artifactId>
</dependency>
<!-- Lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!-- Testing -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-inline</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-junit-jupiter</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-params</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>bom-experiments</finalName>
<sourceDirectory>${project.basedir}</sourceDirectory>
<testSourceDirectory>${project.basedir}/src/test</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${maven-surefire-plugin.version}</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${org.springframework.boot.version}</version>
</plugin>
</plugins>
</build>
</project>
Am I understanding BOM concept wrong? Why are there no dependencies, even though they are declared in pom.xml? How can I run this code without parent but with BOM?

Importing the BOM via dependencyManagement and scope import copies their dependencyManagement configuration into your current dependencyManagement, as you would have written these dependencyManagement configuration.
The section dependencyManagement should only be used within POM of packaging pom. The resulting pom artefact could be used as parent of other POM.
Therefore you should not use BOM without parent.
Have a closer look at https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html

The issue I had, was related to a misconfiguration in pom.xml
Instead of
<sourceDirectory>${project.basedir}</sourceDirectory>
I have to use
<sourceDirectory>${project.basedir}/src/main</sourceDirectory>
This said, it is possible to package differently from pom packaging, so I can use jar or other alternatives.

Conflict problem building the Spring boot

I have a problem building the spring boot application. We need to build the project with the 'lib/bin/conf' structure using the maven. I did it with another project and there is no problem. But now, a conflict occurred and an action is recommended.
***************************
APPLICATION FAILED TO START
***************************
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.<init>(DefaultSingletonBeanRegistry.java:88)
The following method did not exist:
'java.util.Map org.springframework.core.CollectionFactory.createConcurrentMapIfPossible(int)'
The calling method's class, org.springframework.beans.factory.support.DefaultSingletonBeanRegistry, is available from the following locations:
jar:file:/Users/user/.m2/repository/org/springframework/spring/2.5.5/spring-2.5.5.jar!/org/springframework/beans/factory/support/DefaultSingletonBeanRegistry.class
jar:file:/Users/user/.m2/repository/org/springframework/spring-beans/5.3.18/spring-beans-5.3.18.jar!/org/springframework/beans/factory/support/DefaultSingletonBeanRegistry.class
The calling method's class was loaded from the following location:
file:/Users/user/.m2/repository/org/springframework/spring/2.5.5/spring-2.5.5.jar
The called method's class, org.springframework.core.CollectionFactory, is available from the following locations:
jar:file:/Users/user/.m2/repository/org/springframework/spring-core/5.3.18/spring-core-5.3.18.jar!/org/springframework/core/CollectionFactory.class
jar:file:/Users/user/.m2/repository/org/springframework/spring/2.5.5/spring-2.5.5.jar!/org/springframework/core/CollectionFactory.class
The called method's class hierarchy was loaded from the following locations:
org.springframework.core.CollectionFactory: file:/Users/user/.m2/repository/org/springframework/spring-core/5.3.18/spring-core-5.3.18.jar
Action:
Correct the classpath of your application so that it contains compatible versions of the classes org.springframework.beans.factory.support.DefaultSingletonBeanRegistry and org.springframework.core.CollectionFactory
How can I solve this problem? Some of the libraries provided by the company have been deleted. This 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.6</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>...</groupId>
<artifactId>...</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>...</name>
<properties>
<java.version>11</java.version>
<finalName>${project.artifactId}-${project.version}</finalName>
<logback.version>1.2.9</logback.version>
<log4j.version>2.17.0</log4j.version>
</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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-batch</artifactId>
</dependency>
<dependency>
<groupId>net.javacrumbs.shedlock</groupId>
<artifactId>shedlock-spring</artifactId>
<version>4.34.0</version>
</dependency>
<dependency>
<groupId>net.javacrumbs.shedlock</groupId>
<artifactId>shedlock-provider-jdbc-template</artifactId>
<version>4.34.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!-- vault -->
<dependency>
<groupId>org.springframework.vault</groupId>
<artifactId>spring-vault-core</artifactId>
<version>2.2.2.RELEASE</version>
</dependency>
<!-- log4j -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j.version}</version>
</dependency>
<!-- logback -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<!-- Swagger 2 -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.9.2</version>
</dependency>
<!-- Apache Commons -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.11</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>io.lettuce</groupId>
<artifactId>lettuce-core</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<!--proxy-->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.13</version>
</dependency>
</dependencies>
<build>
<finalName>${finalName}</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>

Spring 2.5.5 has been obsolete for 12 years; there's no reason for you to have it. Furthermore, it makes absolutely no sense whatsoever to have a lib directory with Maven; dependency management is much of what Maven is for.
I see nothing in your POM that would pull in Spring 2.5.5. Is it possible that something else related to your project made a typo and intended to include Spring Boot 2.5.5? In any case, determine where this is coming from (mvn dependency:tree) and fix that.

DefaultSingletonBeanRegistry and CollectionFactory are duplicate in spring-2.5.5, actually they are already included in spring-beans and spring-core.
Execute 'mvn dependency:tree -Dverbose' to see how spring-2.5.5 is included, exclude it and try again

how come scala code gets compiled with Java?

I'm trying to understand how Scala code works with Java in Java's IDE. I got this doubt while working with Spark Java where I saw Scala packages too in code and using respective classes and methods.
My understanding says, Scala code need Scala's compiler to convert into Java.class files and then from their onwards JDK do its part in JVM to convert into binaries and do actions. Please correct me if am wrong.
After that, In my spark Java project in eclipse, I couldnt see anywhere where scala compiler is being pointed.
This 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>spark</groupId>
<artifactId>Project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.0</version>
<relativePath />
</parent>
<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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!-- <exclusions> <exclusion> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId>
</exclusion> </exclusions> -->
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.12</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.12</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql-kafka-0-10_2.12</artifactId>
<version>3.0.0</version>
</dependency>
<!-- Gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.6</version>
<scope>provided</scope>
</dependency>
<!-- Avro Messages -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-avro_2.12</artifactId>
<version>3.1.2</version>
</dependency>
<!-- Spark MLLIB -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-mllib_2.12</artifactId>
<version>3.0.0</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.codehaus.janino/janino -->
<dependency>
<groupId>org.codehaus.janino</groupId>
<artifactId>commons-compiler</artifactId>
</dependency>
<dependency>
<groupId>org.codehaus.janino</groupId>
<artifactId>janino</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<!--Spark java.lang.NoClassDefFoundError: org/codehaus/janino/InternalCompilerException -->
<dependency>
<groupId>org.codehaus.janino</groupId>
<artifactId>commons-compiler</artifactId>
<version>3.0.16</version>
</dependency>
<dependency>
<groupId>org.codehaus.janino</groupId>
<artifactId>janino</artifactId>
<version>3.0.16</version>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
And for example am using below import of scala in my Java class file. But literally not getting Idea from which Jars its picking and where its getting compiled to Java.class for further processing.
import scala.collection.JavaConverters;
Can anyone please help me to understand this unknown magic to me ?

Dependencies ship in class file form. That JavaConverters class must indeed be compiled by scalac. However, the maintainers of janino have done this on their hardware, shipped the compiled result to mavencentral's servers, which distributed it to all mirrors, which is how it ended up on your system's disk, which is why you do not need scalac to use it.

The jars, they have compiled files only. They will not have the source files. If you are using any dependency, it is not the source, it is compiled output. So, in your case, JavaConverters, is compiled too. And it is from the package scala.collection which is a built-in package.
May I know you have Scala installed on your system?

How resolve problem with tomcat ? Spring-Boot " Failed to scan"

this is my first spring-boot project and i have problem with tomcat. Server don't wan't to start. Glass fish is not used in the project, the more I am surprised by this message. The project was created in Maven.
I have sitting about this problem many hours and I can't find the problem. Enybody can help me ?
2019-12-11 16:21:30.775 WARN 10436 --- [ main] o.a.tomcat.util.scan.StandardJarScanner : Failed to scan [file:/C:/Users/maxwell/.m2/repository/org/glassfish/hk2/hk2/2.6.1/hk2-utils.jar] from classloader hierarchy
java.io.IOException: java.lang.reflect.InvocationTargetException
at org.apache.tomcat.util.compat.Jre9Compat.jarFileNewInstance(Jre9Compat.java:236) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
This is the my pom.xml 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 https://maven.apache.org /xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>maxwell</groupId>
<artifactId>appdemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>appdemo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-taglibs -->
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-rest -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-tomcat -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>providet</scope>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<scope>provided</scope>
</dependency>
<!-- Tests -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

i have also faced this problem so we can't use concurrently spring-boot-starter-web and spring-boot-starter-jersey because glassfish is part of jersey so just remove any one dependency from both of them in my case i removed starter-jersey
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
finally problem has been gone please try it

You should add the packaging to war at the pom.xml:
<packaging>war</packaging>

It seems something wrong with your dependencies : can you check this typo
tomcat-embed-jasper dependency
providet
Other question why you have two dependencies if you are using tomcat one will be fine.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>providet</scope>
</dependency>
check that example pom
spring boot web dependency is enough it already includes tomcat. You don't need to explicitly define tomcat dependency
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

If it is a new project i would try to run a standard project generated on: https://start.spring.io/. This way you can be sure the project should be runnable and any failure is to blame on anything other than the project or IDE. If that does not run i would reinstall Tomcat.

How to remove duplicates in my WEB-INF/lib jar files?

I know there seems to be a lot of discussion on StackOverflow about the error I am getting, but I don't see exactly the same situation and I'd like to better understand the issue I am having.
I am getting the following failed to start error "Caused by: org.apache.catalina.LifecycleException: A child container failed during start"
After doing some research it seems like this is a WEB-INF/lib and/or a pom.xml dependency issue. It looks like people have been able to solve their issues by removing a variety of jar files or updating their pom file/removing a variety of certain dependencies.
When I look at my WEB-INF/lib jar files, it seems that mine are duplicating... Does any one know why I am getting double/2 versions of the same jar files, and could they tell me which dependency they are coming from in my pom.xml file? I think my project wont start on Tomcat & is getting this issue due to the duplicates, as things are already running once when it tries to start the other duplicate jar files.
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.mySite</groupId>
<artifactId>mySitePortal</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>mySitePortal</name>
<description>mySitePortal</description>
<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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-ldap</artifactId>
</dependency>
<dependency>
<groupId>com.github.dblock.waffle</groupId>
<artifactId>waffle-spring-security3</artifactId>
<version>1.8.0</version>
</dependency>
<dependency>
<groupId>org.springframework.security.kerberos</groupId>
<artifactId>spring-security-kerberos-web</artifactId>
<version>1.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-java8time</artifactId>
<version>3.0.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.4.2.RELEASE</version>
</dependency>
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>mssql-jdbc</artifactId>
<version>6.1.0.jre8</version>
</dependency>
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
</dependency>
<!-- flying saucer pdf -->
<dependency>
<groupId>org.xhtmlrenderer</groupId>
<artifactId>flying-saucer-pdf</artifactId>
<version>9.1.4</version>
</dependency>
<!-- jxls simple excel -->
<dependency>
<groupId>org.jxls</groupId>
<artifactId>jxls</artifactId>
<version>2.4.3</version>
</dependency>
<dependency>
<groupId>org.jxls</groupId>
<artifactId>jxls-poi</artifactId>
<version>1.0.14</version>
</dependency>
<dependency>
<groupId>org.jxls</groupId>
<artifactId>jxls-jexcel</artifactId>
<version>1.0.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>3.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.metawidget.modules</groupId>
<artifactId>metawidget-all</artifactId>
<version>2.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf</artifactId>
<version>3.0.9.RELEASE</version>
</dependency>
<dependency>
<groupId>com.google.code.findbugs</groupId>
<artifactId>annotations</artifactId>
<version>3.0.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<executable>true</executable>
</configuration>
</plugin>
</plugins>
</build>
</project>
Here's a snip of my WEB-INF/lib jars, showing some duplicates.