Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured

Question

I am working on a Spring Boot Batch example with MongoDB and I have already started the mongod server.

When I launch my application, I am getting the error below.

Any pointers for this issue?

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class


Action:

Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

application.properties:

# Mongo database URI. Cannot be set with host, port and credentials.
spring.data.mongodb.uri=mongodb://localhost/test 

pom.xml

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-batch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </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>

I have started mongod with the following output:

C:\Users\pc>mongod
2018-07-07T14:39:39.223+0530 I JOURNAL  [initandlisten] journal dir=C:\data\db\journal
2018-07-07T14:39:39.230+0530 I JOURNAL  [initandlisten] recover : no journal files present, no recovery needed
2018-07-07T14:39:39.478+0530 I JOURNAL  [durability] Durability thread started
2018-07-07T14:39:39.589+0530 I CONTROL  [initandlisten] MongoDB starting : pid=11992 port=27017 dbpath=C:\data\db\ 64-bit host=DESKTOP-NQ639DU
2018-07-07T14:39:39.589+0530 I CONTROL  [initandlisten] targetMinOS: Windows 7/Windows Server 2008 R2
2018-07-07T14:39:39.591+0530 I CONTROL  [initandlisten] db version v3.0.5
2018-07-07T14:39:39.592+0530 I CONTROL  [initandlisten] git version: 8bc4ae20708dbb493cb09338d9e7be6698e4a3a3
2018-07-07T14:39:39.592+0530 I CONTROL  [initandlisten] build info: windows sys.getwindowsversion(major=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1') BOOST_LIB_VERSION=1_49
2018-07-07T14:39:39.592+0530 I CONTROL  [initandlisten] allocator: tcmalloc
2018-07-07T14:39:39.593+0530 I CONTROL  [initandlisten] options: {}
2018-07-07T14:39:39.595+0530 I JOURNAL  [journal writer] Journal writer thread started
2018-07-07T14:39:40.485+0530 I NETWORK  [initandlisten] waiting for connections on port 27017
2018-07-07T14:40:39.140+0530 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:51340 #1 (1 connection now open)
2018-07-07T14:40:41.663+0530 I NETWORK  [conn1] end connection 127.0.0.1:51340 (0 connections now open)
2018-07-07T14:45:12.421+0530 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:51578 #2 (1 connection now open)
2018-07-07T14:45:12.870+0530 I NETWORK  [conn2] end connection 127.0.0.1:51578 (0 connections now open)
2018-07-07T14:46:21.734+0530 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:51591 #3 (1 connection now open)
2018-07-07T14:46:22.041+0530 I NETWORK  [conn3] end connection 127.0.0.1:51591 (0 connections now open)
2018-07-07T14:57:47.523+0530 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:52534 #4 (1 connection now open)
2018-07-07T14:57:47.910+0530 I NETWORK  [conn4] end connection 127.0.0.1:52534 (0 connections now open)

Answer 1

Just add : @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class }) works for me.

I was getting same error I tried with @EnableAutoConfiguration(exclude=...) didn't work.

For those that are wondering where to add @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class }), as it has been asked by user as well. You need to add it to the main Application class which is under src>main>java. By default it is set to @SpringBootApplication

Answer 2

check your application.properties

changing

spring.datasource.driverClassName=com.mysql.jdbc.Driver

to

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

worked for me. Full config:

spring.datasource.url=jdbc:mysql://localhost:3306/db
spring.datasource.username=
spring.datasource.password=   
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto = update

Answer 3

Your problem is the dependency of spring batch spring-boot-starter-batch that has a spring-boot-starter-jdbc transitive maven dependency.

Spring Batch is a framework for building reliable and fault tolerance enterprise batch jobs. It supports many features like restarting a failed batch, recording the status of the batch execution and so on. In order to achieve that Spring Batch uses a database schema to store the status of the registered jobs, the auto-configuration already provides you the basic configuration of the required data source and it is this configuration that requires the relational database configuration.

To solve this you must include some database driver like mysql, h2, etc. to configure the url.

Update: Just for getting start you can configure your application.yml like below:

spring:
  datasource:
    driver-class-name: org.h2.Driver
    url: jdbc:h2:mem:localhost;DB_CLOSE_ON_EXIT=FALSE
    username: admin
    password:

and of course in your pom.xml include the h2 dirver like this:

<?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>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.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>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>

....
    </dependencies>
...

</project>

The motivation, because you can not use mongo for this purpose, is that the usage of mongo is provided only for item readers and writers and not for managing the internal database of Spring Batch that is an internal schema, not a business schema. The query is plain SQL query and the internal abstraction relies on a relational database. It is necessary to have a database with ACID capability because every batch reads and writes a chunk of work and saves that information in order to restart the job. A NoSql solution is not suitable for this.

At the end you have configured a relational database in order to prepare Spring Batch for internal capability, the internal abstraction does not rely on mongo only on jdbc. Then mongo can be used but for the business side of the batch via item reader/writer.

I hope that this can help you to clear your doubts.

Answer 4

Root Cause

The JPA (Java persistence API) is a java specification for ORM (Object-Relational Mapping) tools. The spring-boot-starter-data-jpa dependency enables ORM in the context of the spring boot framework.

The JPA auto configuration feature of the spring boot application attempts to establish database connection using JPA Datasource. The JPA DataSource bean requires database driver to connect to a database.

The database driver should be available as a dependency in the pom.xml file. For the external databases such as Oracle, SQL Server, MySql, DB2, Postgres, MongoDB etc requires the database JDBC connection properties to establish the connection.

You need to configure the database driver and the JDBC connection properties to fix this exception Failed to configure a DataSource: ‘url’ attribute is not specified and no embedded datasource could be configured. Reason: Failed to determine a suitable driver class.

application.properties

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration 

application.yaml

spring:
  autoconfigure:
    exclude: org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration

By Programming

@SpringBootApplication(exclude =  {DataSourceAutoConfiguration.class })

Answer 5

Not to the point of the question (can be related though), but, if you bootstrap a new project and wondering why do you get the same error, it may come from the artifactId of spring-boot-starter-data-jpa in the dependency section. I gave the dependency below. You will need to define the database to get rid of this.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

Answer 6

Excluding the DataSourceAutoConfiguration.class worked for me:

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class })

Answer 7

I had the same issue resolved by add <scope>provided</scope>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <scope>provided</scope>
        </dependency>

Source: https://github.com/spring-projects/spring-boot/issues/13796#issuecomment-413313346

Answer 8

It can be that your resources directory is not added to classpath when creating a project via Spring Initializr. So your application is never loading the application.properties file that you have configured.

To make a quick test if this is the case, add the following to your application.properties file:

server.port=8081

Now when running your application you should see in the spring boot console output something like this:

INFO  o.s.b.w.e.tomcat.TomcatWebServer - Tomcat started on port(s): **8081** (http) with context path ''

If your port is still default 8080 and not changed to 8081, your application.properties files is obviously not loading.

You can also check if your application runs with gradle bootRun from command line. Which most likely will be work.

Solution:

1. Close IntelliJ, then inside your project folder delete the ".idea" folder
2. Reimport your project to IntelliJ like following: "Import Project" -> "select ONLY your build.gradle file to import". (IntelliJ will automatically grab the rest)
3. build and run your application again

See official answer by IntelliJ Support: IDEA-221673

Answer 9

This link helped.

Spring Boot auto-configuration tries to configure beans automatically based on the dependencies added to the classpath. And because we have a JPA dependency (spring-data-starter-jpa) on our classpath, it tries to configure it.

The problem: Spring boot doesn't have the all the info needed to configure the JPA data source i.e. the JDBC connection properties. Solutions:

1. provide the JDBC connection properties (best)
2. postpone supplying connection properties by excluding some AutoConfig classes (temporary - should be removed eventually)

The above link excludes the DataSourceAutoConfiguration.class with

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class})

But this didn't work for me. I instead, had to exclude 2 AutoConfig classes:

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, XADataSourceAutoConfiguration.class})

Answer 10

The following worked for 2021 spring-boot release 2.5.0

If you have as minimum these entries in your application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/db
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

And these dependencies in your pom.xml

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

You should not have this error:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class

It was the IDE in my case

No matter if you are using eclipse or intellij, application must run over linux in real environments. So to validate if is an IDE problem, run your app using shell

mvn spring-boot:run

If it starts without error, the problem is in your IDE

Eclipse

Eclipse IDE for Enterprise Java and Web Developers
Version: 2021-03 (4.19.0)
Build id: 20210312-0638

In my case I was running the project with right click on the classic Application.java inside of spring boot project , then run as java application

After hours of researching, the solution was:

• right click on the root spring boot project
• then run as java application.
• Eclipse shows several class with main methods.
• I chose my Application.java and then run

Long Explanation

If you check the spring boot source code DataSourceProperties.determineDriverClassName you will see that just driverClassName or dirver-class-name and url is required. If not, the exception is thrown

Answer 11

“Failed to configure a DataSource” error. First, we fixed the issue by defining the data source. Next, we discussed how to work around the issue without configuring the data source at all.

https://www.baeldung.com/spring-boot-failed-to-configure-data-source

Answer 12

I have added this annotation on the main class of my spring boot application and everything is working perfectly

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class })

Answer 13

I faced the same issue in my code, adding this code in Application.java file helped me out-

@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class})

Answer 14

For spring boot version 2.X.X below configuration worked for me.

spring.datasource.url=jdbc:mysql://localhost:3306/rest
spring.datasource.username=
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto = update 

Old jdbc driver is deprecated. The new one is mentioned on above configuration. Please use the same and restart the project.

Answer 15

It can be because you have jpa dependendencies and plugins...

just comment it if not use(build.gradle or pom file)

e. g.

// kotlin("plugin.jpa") version "1.3.61"

// implementation("org.springframework.boot:spring-boot-starter-data-jpa")

Answer 16

An optiona Solution if already tested all last answers

If you have an error like title

And validated .properties connection string is correct.

Then add this code block about maven plugin in your .pom file

        ...
    </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-resources-plugin</artifactId>
               <version>3.1.0</version>
        </plugin>

...

And Update project. Works for me!!!

I hope this help you to.

This steps you the found in this link page.

Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources

https://exerror.com/failed-to-execute-goal-org-apache-maven-pluginsmaven-resources-plugin3-2-0resources/

And here: Maven clean install: Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources

Answer 17

It's happening because the @valerio-vaudi said.

Your problem is the dependency of spring batch spring-boot-starter-batch that has a spring-boot-starter-jdbc transitive maven dependency.

But you can resolve it set the primary datasource with your configuration

 @Primary
 @Bean(name = "dataSource")
 @ConfigurationProperties(prefix = "spring.datasource")
 public DataSource getDataSource() {
      return DataSourceBuilder.create().build();
 }

 @Bean
 public JdbcTemplate jdbcTemplate(DataSource dataSource) {
      return new JdbcTemplate(dataSource);
 }

Answer 18

If you're using Gradle, rebuild Gradle can solve this problem.

Answer 19

Add this annotation in main java file

@EnableAutoConfiguration(exclude=DataSourceAutoConfiguration.class)

Answer 20

So, I am had with similar problem, and this link helpfull

• https://www.yawintutor.com/failed-to-configure-a-datasource-failed-to-determine-a-suitable-driver-class/

What I understood is that preset of project need to have a "RDBMS Database" and a "In Memory Database"

RDBMS Database

• mysql
• Postgres
• oracle
• SQL server

In Memory Database

• H2 Database
• HSQL Database
• Derby Database

So, when I selected this preset, all worked great

Answer 21

It simply means you have downloaded a spring starter code with database dependency without configuring your database, So it doesn't know how to connect. For Spring boot version 2.18 do the following steps to fix it.

1. Create a database for the driver you have downloaded ie mysql/mongo etc.

2. In your applications.properties file add the db connection info. Sample is given for mysql if your db is mongo change it for mongo.

spring.datasource.url=jdbc:mysql://localhost:3306/db_name_that_you_created
spring.datasource.username=your_db_username_here
spring.datasource.password=your_db_pass_here
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto = update

3. Reboot the server it will be running.

Answer 22

If datasource is defined in application.resources, make sure it is locate right under src/main and add it to the build path.

Answer 23

I had the same issue and tried all suggestions above, but didnt work out. I am posting my answer for furture readers. Before it was working fine but somehow it apeared again. I resolved this issue by removing some unnecessary plugnins and depencies from pom.xml

1. First of all, I changed default packaging type to jar (Spring Boot Initializer gives pom in packaging)

   <packaging>jar</packaging>

2. I added unintentional some plugins:

   <plugin> <artifactId>maven-war-plugin</artifactId> <configuration> <attachClasses>true</attachClasses> <webXml>target/web.xml</webXml> <webResources> <resource> <directory>src/main/webapp</directory> <filtering>true</filtering> </resource> </webResources> </configuration> </plugin>

I hope my answer will help someone.

Answer 24

If you have a JPA dependency in your pom.xml then just remove it. This solution worked for me.

Answer 25

If you added "spring-boot-starter-data-jpa" dependency in pom.xml, Please add respective database in dependency like h2 and etc.

Answer 26

For me the resource folder was getting excluded on a maven update/build. I went to Build Path>Source and found that src/main/resources have "Excluded **". I removed that entry (Clicked on Excluded **>Remove>Apply and Close).

Then it worked fine.

Answer 27

If you are using YAML for configuration, then it might be indentation problem. Thoroughly check the YAML files.

Answer 28

Check your application.properties file. One of the probable reason for it is that

• you might be added "Spring Data" maven plugin and you are not providing the datastore details in application.properties file.

Answer 29

Inside pom.xml file always keep the updated spring framework version. I had created a project with spring framework version 2.5.5 and it was working fine that time. After a couple of months, I found that it is not working correctly. Then I put the latest version of the spring framework. Then it works.

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>Updated version</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

Answer 30

For anyone using Spring Boot 2:

Default DataSource implementation is Hikari now instead of TomcatJDBC.

spring.datasource.url = jdbc...
spring.datasource.driver-class-name = com.mysql...

If you have provided above properties and still getting OP's error:

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class

Add Hikari jdbc url property to use your datasource url property.

spring.datasource.hikari.jdbc-url = ${spring.datasource.url}

Checkout this answer also.

Answer 31

Check spring profile also, by default it goes for 'default' profile, if your application properties have different profiles like the test, prod, etc then you need to set up it. for eclipse set environment variable as name=spring.profiles.default, value=test

Answer 32

There may be chance where you missed to mention your application profile in the VM arguments.

My case, I have missed to add below one in the VM arguments.

-Dspring.profiles.active=dev

Answer 33

This is an issue in new STS. STS couldn't read your application.yml/properties file. to fixed it follow below steps.

1. Select project -> Right click and Select "Run as" -> "Run configuration" -> Select "Classpath" tab.

2. Select "User entries" -> select "Advanced" button. -> Add folder -> and select "resources" under you project hierarchy (project->src->main->resources).

3. It should be as per below screenshot.

Answer 34

This one worked for me, for MySQL: (Application properties)

spring.datasource.url=jdbc:mysql://localhost:3306/db?useSSL=false&useUnicode=true&useJDBCCompliantTimezoneShift=true&
useLegacyDatetimeCode=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=admin
spring.jpa.hibernate.ddl-auto=create
spring.jpa.show-sql=true

Answer 35

I removed an obsolete dependency on mybatis in the pom.xml to get mine running.

Answer 36

I meet same error when start a new project. Use command line works for me.

./gradlew bootRun

Answer 37

You need to configure the database driver and the JDBC connection properties to fix this exception Failed to configure a DataSource: ‘url’ attribute is not specified and no embedded datasource could be configured. Reason: Failed to determine a suitable driver class.

application.properties

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration

Answer 38

Its not a big issue just give Add in Application.properties: ``

spring.datasource.name=/name/

Answer 39

every thing is fine when i run the project in IDE / STS (spring tool suit).
but this was thrown when i made a jar.

unnecessary spaces " " in the "application.yml" file can cause this.

server:
  port: 8085


spring:
 datasource:
  url: jdbc:mysql://localhost:3306/studentdb
  username: root
  password: root
  driver-class-name: com.mysql.cj.jdbc.Driver
 jpa:
   hibernate:
    ddl-auto: update
   show-sql: true
   database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
 application:
  name: STUDENT-SERVICE

instead of tweaking my "application.yml" file
i simply moved all my statements in "application.yml" file to
"application.properties" file and formatted the statements like required in ".properties".

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/studentdb
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.hibernate.ddl-auto = update
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format.sql=true

spring.application.name=student-service

server.port=8085

(you can add params at the end of url)
(spring.datasource.url=jdbc:mysql://localhost:3306/studentdb?allowPublicKeyRetrieval=true&useSSL=false)

and voilà

Answer 40

Step 1) Put following dependencies in pom.xml file.

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>

Step 2) Put following code in application.properties file.

spring.datasource.url=jdbc:mysql://localhost:3306/employee_directory? 
 useSSL=false&allowPublicKeyRetrieval=true
 spring.datasource.username=springstudent
  spring.datasource.password=springstudent

Step 3) Check carefully if application.properties file is placed in src/main/resources folder.

Step 4) Step 3 is very crucial as, you could spend all day in finding error in code, but the real problem is the location of the application.properties file.

Answer 41

That mean you lack "Define the DataSource Using Properties"

For define example :(remember change sql datasource, username and pass)

spring.datasource.url=jdbc:mysql://localhost:3306/basic_springboot 
spring.datasource.username=root
spring.datasource.password=manhcong
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

And you can ref this

https://www.baeldung.com/spring-boot-failed-to-configure-data-source

Answer 42

Format application.yml https://jsonformatter.org/yaml-formatter or use application.properties

Answer 43

I have added spring.datasource.driver-class-name=org.postgresql.Driver in my application.properties then it worked

Answer 44

i had this problem because i used MongoDb ,with gradle 7.2.If there are people in the same case. you have to delete the dependency in your build.gradle:

"implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'"

Answer 45

For me, it simply didn't see the application.yml so I added --spring.config.location=/absolute/path/to/my/application.yml as CLI arguments to my application (program arguments) in my run configuration and it worked.

The reason was probably wrong module configuration with unnecessary JPA provider descriptor that I don't have in the project at all but there was a little pop up that I clicked unaware and I selected the source, test and resource directories on my own because the auto process didn't pop out

Answer 46

It is strange but in my case I restarted STS and then I deleted the static and template folder from src/main/resources/ and then the application starts running.

Answer 47

I think when importing modules you have imported another package, Go to modules and remove al of them. After that import modules from the package of the project

Answer 48

Adding h2 dependency to the pom file can resolve such issues. ...... com.h2database h2 ......