Develop Reference

Issues related to ClassNotFoundException: org.springframework.boot.bind.RelaxedPropertyResolver

I've been trying to develop a pay system using the guidance from some video tutorials.
I've done everything as follows and upgrade the version of some dependencies.However, When I try to build this program I got an error:
Issues related to ClassNotFoundException: org/springframework/boot/bind/RelaxedPropertyResolver.
Here are my pom.xml files:
this is parent's pom.xml
<?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>springCloudLearning</artifactId>
<version>1.0-SNAPSHOT</version>
<modules>
<module>cloud-provider-payment8001</module>
</modules>
<packaging>pom</packaging>
<properties>
<maven.compiler.source>18</maven.compiler.source>
<maven.compiler.target>18</maven.compiler.target>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.6.2</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
this is the pom.xml of module
<?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">
<parent>
<artifactId>springCloudLearning</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-provider-payment8001</artifactId>
<properties>
<maven.compiler.source>18</maven.compiler.source>
<maven.compiler.target>18</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.1</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.8</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.27</version>
</dependency>
</dependencies>
</project>
I thought that may be I mixed different versions, but I don't know how to fix it. Please help me ...

Well, I know why this happened.
I found mybatis-spring-boot-starter and druid-spring-boot-starter rely on the same dependency spring-boot-autoconfigure and their versions conflict with each other.
When I exclude spring-boot-autoconfigure in druid-spring-boot-starter, everything works! Thanks to idea's powerful dependency Diagram

Why IntelliJ is showing Dependency 'org.slf4j:slf4j-simple:1.7.25' not found?

I have added slf4j dependency from mvn repository.
My pom.xml is given below after adding that dependency :
<?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">
<groupId>org.example</groupId>
<artifactId>KafkaProject</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients -->
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.6.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.25</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
After adding this dependency in my project, it is giving an error saying that:
Dependency 'org.slf4j:slf4j-simple:1.7.25' not found
By the way, I am using IntelliJ IDEA. So, how to resolve this issue ?

It's not giving me the error.
I think the dependencies are not downloaded due to slow network.
Try to update the project by doing Maven Update/Install to download the dependencies again.
Try this 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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>KafkaProject</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>simple Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.25</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>KafkaProject</finalName>
</build>
</project>

Maven: "Could not find artifact package:jar:1.0-SNAPSHOT"?

I've tried installing a Spring project, and had one created from start.spring.io. However, when trying to run mvn clean install, I have run into errors:
Could not find artifact com.sof:game-mix:jar:1.0-SNAPSHOT
I know this is has happened to others, and I've checked these threads for more information but unfortunately my attempts to replicate their solutions haven't worked for me.
Here is a link to my project, for anyone who wishes to replicate the project and see if mvn clean install might work for them. Otherwise, the code for my pom.xml files is below
I have three pom.xml files:
Root pom.xml:
<?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>com.sof</groupId>
<artifactId>game-mix</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<parent>
<artifactId>spring-boot-starter-parent</artifactId>
<groupId>org.springframework.boot</groupId>
<version>2.0.3.RELEASE</version>
<relativePath/>
</parent>
<modules>
<module>core</module>
<module>web</module>
</modules>
<properties>
<java.version>13</java.version>
</properties>
</project>
My web module's 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">
<parent>
<artifactId>game-mix</artifactId>
<groupId>com.sof</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>web</artifactId>
<dependencies>
<!--dependency for our core module-->
<dependency>
<groupId>com.sof</groupId>
<artifactId>game-mix</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<!--dependency for spring boot-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--Thymeleaf Dependency-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!--Spring Boot devtools-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
And my core module's pom.xml:
<?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">
<parent>
<artifactId>game-mix</artifactId>
<groupId>com.sof</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>core</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
</project>
Where exactly am I going wrong? I'd appreciate any assistance

I deleted my first answer because I did not read your POMs thoroughly enough.
com.sof:game-mix:jar:1.0-SNAPSHOT is your parent POM. You cannot reference it as a <dependency>.

Why is my Maven not using the defined BOM?

I am currently trying to introduce a BOM (bill of materials) file to my Maven project, but it does not seem to work and I have no clue, why.
This is my bom:
<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>com.private</groupId>
<artifactId>test.bom</artifactId>
<version>5.0.0-SNAPSHOT</version>
<packaging>pom</packaging>
<properties>
<version.CoreAnnotation>5.0.0-SNAPSHOT</version.CoreAnnotation>
<version.CoreWeb>5.0.0-SNAPSHOT</version.CoreWeb>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.private</groupId>
<artifactId>CoreAnnotation</artifactId>
<version> ${version.CoreAnnotation}</version>
<type>ejb</type>
</dependency>
<dependency>
<groupId>com.private</groupId>
<artifactId>CoreWeb</artifactId>
<version>${version.CoreWeb}</version>
<type>war</type>
</dependency>
</dependencies>
</dependencyManagement>
</project>
There are many more, but I excluded them because I think this should be enough as an example.
This is my pom (where I try to include the bom):
<?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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>Core</artifactId>
<groupId>com.private</groupId>
<version>5.0.0-SNAPSHOT</version>
</parent>
<artifactId>Core-ear</artifactId>
<packaging>ear</packaging>
<name>Core-ear: EAR Module for private</name>
<properties>
<version.test.bom>5.0.0-SNAPSHOT</version.test.bom>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.private</groupId>
<artifactId>test.bom</artifactId>
<version>${version.test.bom}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
</project>
Whenever I use maven install there should be a collection of all packages defined in the dependencies section appear in the folder \target\Core-ear\
Now the problem: The dependencies defined in the bom don't appear there. What could be the problem?
ps: running mvn install -X for debugging does not seem to help.

This happens because you did not declare the dependencies in your POM. You only declared the <dependencyManagement> section.
In your POM, you need to add the following dependencies, without the version:
<dependencies>
<dependency>
<groupId>com.private</groupId>
<artifactId>CoreAnnotation</artifactId>
<type>ejb</type>
</dependency>
<dependency>
<groupId>com.private</groupId>
<artifactId>CoreWeb</artifactId>
<type>war</type>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.private</groupId>
<artifactId>test.bom</artifactId>
<version>${version.test.bom}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
Refer to Introduction to the Dependency Mechanism: BOM are used to factor version of all the artifacts, so you don't need to add it in your <dependency> section.

maven multi-module project with jersey & spring

I've been referring stackoverflow questions for quite some time. now i have got one of my own. I'm basically trying to create a Rest webservice with Jersey 2.22.1. I'm using this archetype to create a maven jersey project from section 1.4 here
mvn archetype:generate -DarchetypeArtifactId=jersey-quickstart-webapp \
-DarchetypeGroupId=org.glassfish.jersey.archetypes -DinteractiveMode=false \
-DgroupId=com.example -DartifactId=simple-service-webapp -Dpackage=com.example \
-DarchetypeVersion=2.22.1
This generates a sample rest jersey webservice. Now i want to access mongodb through this webservice. I'm trying to create a separate jar maven project that uses spring to connect to mongodb. its structure is
com.yuvi.mongo.service
com.yuvi.mongo.dao
I have a main class inside service which loads spring context , retrieve dao bean n performs db access.
Now i want to connect these two projects.
I created a parent project, included these 2 as its modules and added mongo as dependency in service. but when i try to access package com.yuvi.mongo from my service it shows package not found error. I created two simple maven projects and followed same procedure for creating multi-module projects that was working perfectly. but when i try it here i can't access the package. I'm displaying my pom files here.,
parent pom
<?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>com.yuvi</groupId>
<artifactId>Parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>Mongo</module>
<module>RService</module>
</modules>
</project>
Mongo pom
<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.yuvi</groupId>
<artifactId>Parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<groupId>com.yuvi.mongo</groupId>
<artifactId>Mongo</artifactId>
<name>Mongo</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring-version>4.2.3.RELEASE</spring-version>
<mongodb-version>1.8.1.RELEASE</mongodb-version>
</properties>
<dependencies>
<!-- Spring 4 dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
<version>${mongodb-version}</version>
</dependency>
</dependencies>
</project>
RService pom
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.yuvi</groupId>
<artifactId>Parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<groupId>com.yuvi.service</groupId>
<artifactId>RService</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>RService</name>
<build>
<finalName>RService</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<inherited>true</inherited>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.yuvi.mongo</groupId>
<artifactId>Mongo</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>${jersey.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<!-- use the following artifactId if you don't need servlet 2.x compatibility -->
<!-- artifactId>jersey-container-servlet</artifactId -->
</dependency>
<!-- uncomment this to get JSON support
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-moxy</artifactId>
</dependency>
-->
</dependencies>
<properties>
<jersey.version>2.22.1</jersey.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>