Spring boot won't recognize an added dependency

Spring boot won't recognize an added dependency - java

I am trying to add the ModelMapper dependency via pom.xml, however, when I try create a new instance of modelMapper it doesn't recognize the dependency and instead tries to import modelMapper from Swagger. I have tried adding it manually and still I get the same problem.
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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<!-- PARENT -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.12</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com</groupId>
<artifactId>golden.scent</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>something</name>
<description>Demo project for Spring Boot</description>
<!-- PROPERTIES -->
<properties>
<java.version>11</java.version>
</properties>
<!-- DEPENDENCIES -->
<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-validation</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<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>
<!-- https://mvnrepository.com/artifact/org.modelmapper/modelmapper -->
<dependency>
<groupId>org.modelmapper</groupId>
<artifactId>modelmapper</artifactId>
<version>2.3.8</version>
</dependency>
</dependencies>
<!-- BUILD -->
<build>
<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>
Configuration
import springfox.documentation.swagger2.mappers.ModelMapper;
#Configuration
public class Config {
#Bean
public ModelMapper modelMapper(){
return new ModelMapper()
}
}
Tried using the invalidate cache/restart which usually solves the problem. not this time.
I am trying to use DTO beans and do not want to write a mapper manually.
I have tried looking for solutions but could not find one yet.
Thanks

Change your class to the following:
import org.modelmapper.ModelMapper;
#Configuration
public class Config {
#Bean
public ModelMapper modelMapper(){
return new ModelMapper();
}
}
If with this you can't compile your code, you might need to delete org/modelmapper folder in the .m2 folder in your machine and reload your maven dependencies again.

Try nuking your .m2 folder, and then pull dependencies again. I usually do it like this: delete everything from .m/repo, I go to intellij and add space in pom.xml and delete it so it offers me to pull changes that were made in pom.xml
If that does not help, you can always run from your terminal
mvn clean - clear dependencies so you get something like a clean slate
mvn install - initiates the pulling of dependencies again

Related

Driver org.h2.Driver claims to not accept jdbcUrl, jdbc:postgresql://my-previous-db

I try to use H2 database in my new project, before I used postgres. Wrote all data in application.properties, also there is nothing about postgres driver in pom file, only H2 driver, but during auto-configuration each time it tries to connect to my previous database as a result shows this error.
Driver org.h2.Driver claims to not accept jdbcUrl, jdbc:postgresql://{my-previous-db-url}
Could anyone help to solve the problem?
application.properties
spring.datasource.generate-unique-name=false
spring.datasource.name=taco
spring.datasource.url=jdbc:h2:mem:taco
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=user
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
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 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>2.7.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>MyProject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MyProject</name>
<description>TacoExample</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<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>
I have no idea what to do, tried to find any info about parent pom.file but had no success
UPDATE: also forgtot that if I specify datasource bean in configuration, everything is ok. But I can't understand where does Spring boot takes the URL to the previos database by Autoconfiguration

This error is attributed to the project have not compile.You use spring-boot-devtools in the project.But the plug-in stops compiling automatically duing running or debugging, at this time need build the project.
You can do this:
Stop the project,delete the target folder and build the project.
Run project and have a try.
You also need check idea conifg adout devtools,something might be wrong.
And you can use Jrebel instead of devtools.

Json webtoken dependency will not resolve in pom.xml

I am currently working on a Spring Project, which I am new to, and have no idea why this dependency I got from the maven repository will now resolve itself. I have tried to use both the separated dependency (jjwt-api, etc..) and the one pasted in my pom.xml below but it will not resolve. If anyone can help me figure this out that would great appreciated.
Spring v2.6.4
Java JDK 17
Error message: Dependency 'com.auth0:java-jwt:3.18.3' not found
l 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>2.6.4</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.legacy-banking</groupId>
<artifactId>legacyBankingAPI</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>legacyBankingAPI</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</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-oauth2-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
---------THIS IS THE DEPENDENCY IN QUESTION BELOW---------------------------
<dependency>
<groupId>com.auth0</groupId>
<artifactId>java-jwt</artifactId>
<version>3.18.3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-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>

The MvnRepository page says, it's in the central repo, and the central repo link to the pom.xml of the dependency also works: https://repo1.maven.org/maven2/com/auth0/java-jwt/3.18.3/java-jwt-3.18.3.pom
So did you maybe try to resolve it once when you were offline? Failed resolving also is cached in your local maven repo, so you might have to clean that up. You can try to use
mvn dependency:get -Dartifact=com.auth0:java-jwt:3.18.3
or you clean the cached "missing" dependency manually: go to your local maven repo (usually in ~/.m2/repository), descend to com/auth0/java-jwt and remove the folder 3.18.3 inside, then run your maven build again.

I just reloaded the pom.xml file and it the works.

Not able to access application on Tomcat with Swagger, Spring, Hibernate

I am using Swagger-UI and Codegen to generate my APIs and then I am using Spring Boot and Hibernate in my application.
When I build my application and run via Maven command mvn spring-boot:run, my application runs and Swagger UI is displayed. But when I create the WAR file and deploy it to Tomcat server, I am not able to access the application. I do not see any errors in Catalina logs. Any advice on what could be going wrong?
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>com.datadivers</groupId>
<artifactId>swagger-spring</artifactId>
<packaging>war</packaging>
<name>swagger-spring</name>
<version>1.0.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.5</version>
</parent>
<properties>
<java.version>1.8</java.version>
<maven.compiler.source>${java.version}</maven.compiler.source>
<maven.compiler.target>${java.version}</maven.compiler.target>
<springfox-version>2.9.2</springfox-version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--SpringFox dependencies -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${springfox-version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${springfox-version}</version>
</dependency>
<dependency>
<groupId>com.github.joschi.jackson</groupId>
<artifactId>jackson-datatype-threetenbp</artifactId>
<version>2.6.4</version>
</dependency>
<!-- Bean Validation API support -->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
</dependency>
<dependency>
<groupId>jakarta.xml.bind</groupId>
<artifactId>jakarta.xml.bind-api</artifactId>
</dependency>
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<finalName>bankingapi</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.5.RELEASE</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Spring Boot application:
imports...
#SpringBootApplication
#EnableSwagger2
#EnableJpaRepositories(basePackages = "com.datadivers.repository")
#EntityScan(basePackages = "com.datadivers.model")
#ComponentScan(basePackages = { "io.swagger", "io.swagger.configuration", "com.datadivers.api", "com.datadivers.service"})
public class Swagger2SpringBoot extends SpringBootServletInitializer{
public static void main(String[] args) {
SpringApplication.run(Swagger2SpringBoot.class, args);
}
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Swagger2SpringBoot.class);
}
}

The suggestion from #PiotrP.Karwasz worked for me. Hence submitting this as the answer to my problem. Thank you for the help.
Spring 5 requires a Java EE 8 server (it provides a
javax.servlet.ServletContainerInitializer), while Tomcat 10 is a
Jakarta EE 9 server (it searches for a
jakarta.servlet.ServletContainerInitializer): see this question.
Downgrade to Tomcat 9.0 and it should work.

In Intellij idea
in project structure, you can create artifacts
pay attention to output directory this path must be excluded in Module section
now you can add war file to Deployment Section in Configuration Section
if you have security checked the access when input url swagger in to browser

Try this guideline https://www.baeldung.com/spring-boot-war-tomcat-deploy#creating-a-spring-boot-war
add a Tomcat dependency
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
and add SpringBootServletInitializer
like in example
#SpringBootApplication
public class SpringBootTomcatApplication extends SpringBootServletInitializer {
}

Cannot resolve symbol 'SpringBootApplication'

I'm new to java springboot.. I got a new laptop and i installed all the software and started with spring.io as soon as i import im getting this error "Cannot resolve symbol 'SpringBootApplication'" i havent changed anything yet.
<?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>2.4.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>Receive</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Receive</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<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>
Tried reimporting maven/cleared cache nothing seems to be working. Please help

Try this
File -> Invalidate Caches/Restart -> Invalidate And Restart

can you try mvn clean install -U it will force update dependencies

If that's the whole pom, you didn't close the project tag.
Add </project> below </build> and try to load maven changes to update dependencies.

Change https in this line:
https://maven.apache.org/xsd/maven-4.0.0.xsd"
to http

java.lang.NoClassDefFoundError: org/springframework/core/env/ConfigurableEnvironment

I am trying to write a simple RESTful service using Spring Boot. However, there is an error message I am not able to solve. I have been researching and it looks like it is a conflict between SpringBoot versions, however I am not sure about how can I get rid of it.
I have this SpringBootApp:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* REST Service application
*/
#SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
Associated with this pom.xml:
<?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>
<groupId>com.websystique.springmvc</groupId>
<artifactId>Spring4MVCHelloWorldRestServiceDemo</artifactId>
<packaging>war</packaging>
<version>1.0.0</version>
<name>Spring4MVCHelloWorldRestServiceDemo Maven Webapp</name>
<properties>
<springframework.version>4.3.0.RELEASE</springframework.version>
<jackson.library>2.7.5</jackson.library>
<spring.batch.version>2.1.9.RELEASE</spring.batch.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.4.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version> <!-- Or whatever JUnit you're using. -->
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.library}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
<version>${jackson.library}</version>
</dependency>
<dependency>
<groupId>org.springframework.batch</groupId>
<artifactId>spring-batch-core</artifactId>
<version>${spring.batch.version}</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<warSourceDirectory>src/main/webapp</warSourceDirectory>
<warName>Spring4MVCHelloWorldRestServiceDemo</warName>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<finalName>Spring4MVCHelloWorldRestServiceDemo</finalName>
</build>
</project>
Looks fine for me, but I am getting this error:
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/core/env/ConfigurableEnvironment
at com.application.Application.main(Application.java:13)
Caused by: java.lang.ClassNotFoundException: org.springframework.core.env.ConfigurableEnvironment
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more

Recommended Approach
Go to Spring boot Initialzr site and select web stack as a dependency as shown in below .
As Spring Boot uses the concept of Opinionated dependencies and Bill of Materials, It will automatically pull the other dependencies and resolve your classNotFoundException issue. And in your case it misses out the Spring-core-4.2.4.RELEASE.jar dependency.
Execute the Maven Goal as clean install spring-boot:run -e and you can find your maven dependencies in your IDE and below given is a sample 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>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</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>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
< /dependency>
</dependencies>
<build>
<finalName>demo</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

Spring boot is running -
<spring.version>4.3.2.RELEASE</spring.version>
For -
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.4.0.RELEASE</version>
</dependency>
While you are importing -
<springframework.version>4.3.0.RELEASE</springframework.version>
You can confirm on the master pom -
https://github.com/spring-projects/spring-boot/blob/v1.4.0.RELEASE/spring-boot-dependencies/pom.xml
Can you update the spring version in your pom? Or deal with managing maven dependencies

Delete the springframework folder in repository, then press Alt + F5 and update the project (force update snapshot).
C:\Users\xxxx\.m2\repository\org\springframework

changed the boot-starter-parent version from 1.5.1.RELEASE to 1.4.0.RELEASE.

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
</parent>
Please Try this one for your parent

I had same problem with Spring boot 2.1.9.RELEASE
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
Added pom dependency eliminated this exception:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
EDIT - better approach.
Also clean up of maven repository with spring dependencies resolved problem for me, there were not need to add spring-core 5.2.0.RELEASE in pom. Seems that when I had many versions of spring in repo some problem occurs. Also before again resolve dependencies dont forget clean project.
rm -rf ~/.m2/repository/org/springframework/

For me changing all
<version>2.4.10</version>
to
<version>2.4.3</version>
in pom.xml file worked.

I changed the boot-starter-parent configuration which was runnig version 2.0.0 to 1.4.0 and I was able to run the java application and got rid of this error
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version> <!-- changed it to version 1.4.0 from 2.0.0-->
<relativePath/> <!-- lookup parent from repository -->
</parent>

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