How to solveFailed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-configured - spring-boot

Question

I am trying to run a SpringBootApplication in EC2, i have hosted the mysql in RDS. While i was trying in my local database it was working fine, but as soon as i shifted to Rds the application is giving me the error
***************************
APPLICATION FAILED TO START
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Description:
Failed to auto-configure a DataSource: 'spring.datasource.url' is not
specified and no embedded datasource could be auto-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).
I have googled and tried to add some configuration in the application , but it is not working for me
Here i am posting the class which the application is mentioning
AppUserDAO
#Repository
#Transactional
public class AppUserDAO {
#Autowired
private EntityManager entityManager;
public AppUser findUserAccount(String userName) {
try {
String sql = "Select e from " + AppUser.class.getName() + " e " //
+ " Where e.userName = :userName ";
Query query = entityManager.createQuery(sql, AppUser.class);
query.setParameter("userName", userName);
return (AppUser) query.getSingleResult();
} catch (NoResultException e) {
return null;
}
}
}
AppRoleDAO
#Repository
#Transactional
public class AppRoleDAO {
#Autowired
private EntityManager entityManager;
public List<String> getRoleNames(Long userId) {
String sql = "Select ur.appRole.roleName from " + UserRole.class.getName() + " ur " //
+ " where ur.appUser.userId = :userId ";
Query query = this.entityManager.createQuery(sql, String.class);
query.setParameter("userId", userId);
return query.getResultList();
}
}
UserDetailsServiceImpl
#Service
public class UserDetailsServiceImpl implements UserDetailsService {
#Autowired
private AppUserDAO appUserDAO;
#Autowired
private AppRoleDAO appRoleDAO;
#Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
AppUser appUser=this.appUserDAO.findUserAccount(username);
if(appUser==null) {
System.out.println("User not found! "+username);
throw new UsernameNotFoundException("User "+username+" was not found in the database");
}
System.out.println("Found User :"+appUser);
List<String> roleNames=this.appRoleDAO.getRoleNames(appUser.getUserId());
List<GrantedAuthority> grantList = new ArrayList<GrantedAuthority>();
if(roleNames!=null) {
for(String role:roleNames){
GrantedAuthority authority = new SimpleGrantedAuthority(role);
grantList.add(authority);
}
}
UserDetails userDetails=(UserDetails)new User(appUser.getUserName(),appUser.getEncrytedPassword(),grantList);
return userDetails;
}
}
Application.properties
==============================
# DATABASE
# ===============================
spring.datasource.url=jdbc:mysql://myrdsinstance.ciswboatdreq.us-east-1.rds.amazonaws.com/rdsTest
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.o7planning</groupId>
<artifactId>SpringBootSecurityJPA</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SpringBootSecurityJPA</name>
<description>Spring Boot +Spring Security + JPA + Remember
Me</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.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-data-jpa</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-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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.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>
<configuration>
<mainClass>org.o7planning.sbsecurity.SpringBootSecurityJpaApplication</mainClass>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Please help me to resolve this

Answer 1

Try this...
#PersistenceContext
private EntityManager entityManager;
EDIT
After Edits in Question
Failed to auto-configure a DataSource: 'spring.datasource.url' is notspecified and no embedded datasource could be auto-configured.
Reason: Failed to determine a suitable driver class
You have to mention the Driver of mysql in application.properties
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
(or)
spring.datasource.driverClassName=com.mysql.jdbc.Driver

Answer 2

Try to inject EntityManager dependency by constructor in your DAOs, not a field.
Moreover, you could also initialize your bean in your main Spring Boot application class, doing something like this:
#Bean
public EntityManager entityManager() {
return new EntityManager();
}