Spring Boot not recognizing application.properties file

You can make a try to define resources tag in the build section in your pom.xml file. Set path for resource directory where is application.properties

<build>
  <resources>
    <resource>
      <directory>resources</directory>
      <targetPath>${project.build.outputDirectory}</targetPath>
      <includes>
        <include>application.properties</include>
      </includes>
    </resource>
  </resources>
</build>

Resource Link: https://stackoverflow.com/a/30595114/2293534

Another approach:

If you use spring 3.X version, You can add @PropertySource("application.properties")

@Configuration
@PropertySource(value = "classpath:application.properties")
public class ApplicationConfig {

    // more configuration ...
}

If you use spring 4 version, you add 2 properties file using new annotation called @PropertySources that allows you to declare repeated @PropertySource annotations:

@PropertySources({
    @PropertySource("default.properties"),
    @PropertySource("overriding.properties")
})

Details is given here in my another answer: https://stackoverflow.com/a/43659158/2293534

UPDATE #1:

Replace your App.java class with following class

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

//@SpringBootApplication
@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }


    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(applicationClass);
    }

    private static Class<Application> applicationClass = Application.class;
}

For java.io.FileNotFoundException:

Use the following

@PropertySource(value = "database.properties", ignoreResourceNotFound = true)

UPDATE #2:

I have followed the following steps to run your application. It runs successfully.

  1. Go to your project folder where pom.xml is exists.

  2. You have some errors and warning on pom.xml. I have clarified all.

  3. Open command prompt and Run mvn clean

  4. Run mvn clean install

  5. At last mvn spring-boot:run

Then in browser, I run http://localhost:8080/

It opens the project successfully. I have also searched other pages also opened successfully.

First page looks like below http://localhost:8080/

enter image description here

All Review pages look like below: http://localhost:8080/api/reviews

[
  {"id":1,"userName":"ychennay","reviewText":"This restaurant was terrific!"},{"id":2,"userName":"david","reviewText":"This restaurant
 was okay!"},
  {"id":3,"userName":"ben","reviewText":"This restaurant was
 mediocre!"},
  {"id":4,"userName":"leon","reviewText":"This restaurant
 was awful!"},
  {"id":5,"userName":"lawrence","reviewText":"This
 restaurant was confusing!"}
]

So Replace your 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>com.diningapp</groupId>
  <artifactId>Dining</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <properties>
    <jackson.version>2.7.5</jackson.version>
    <spring-version>4.3.7.RELEASE</spring-version>
    <dynamodb-local.port>8000</dynamodb-local.port>
    <dynamodb-local.endpoint>http://localhost:${dynamodb-local.port}</dynamodb-local.endpoint>
    <spring-boot-version>1.5.2.RELEASE</spring-boot-version>
    <aws-sdk-java-version>1.11.124</aws-sdk-java-version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <!-- For UTF-8 support -->
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>    <!-- For UTF-8 support -->
  </properties>

  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.7</source>          <!-- Used java7 -->
          <target>1.7</target>          <!-- Used java7 -->
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>${spring-boot-version}</version>
        <executions>
          <execution>
            <goals>
              <goal>repackage</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.0.0</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <repositories>
    <repository>
      <id>dynamodb-local-oregon</id>
      <name>DynamoDB Local Release Repository</name>
      <url>https://s3-us-west-2.amazonaws.com/dynamodb-local/release</url>
    </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>org.springframework.data</groupId>
      <artifactId>spring-data-releasetrain</artifactId>
      <version>Hopper-SR10</version>
      <type>pom</type>
      <!-- <scope>import</scope> -->
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <version>${spring-boot-version}</version>      <!-- You have missed to add this version -->
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-configuration-processor</artifactId>
      <version>${spring-boot-version}</version>      <!-- You have missed to add this version -->
      <optional>true</optional>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <version>${spring-boot-version}</version>
    </dependency>
    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-java-sdk-dynamodb</artifactId>
      <version>${aws-sdk-java-version}</version>
    </dependency>
    <dependency>
      <groupId>com.github.derjust</groupId>
      <artifactId>spring-data-dynamodb</artifactId>
      <version>4.3.1</version>
    </dependency>

    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-java-sdk-bom</artifactId>
      <version>${aws-sdk-java-version}</version>
      <type>pom</type>
      <!-- <scope>import</scope> -->
      <scope>provided</scope>      <!-- changed import to provided -->
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-tomcat</artifactId>
      <version>${spring-boot-version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring-version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${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>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${spring-version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>      <!-- You have missed to add this version -->
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-security -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-security</artifactId>
      <version>${spring-boot-version}</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.16.10</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>
</project>

Errors and solutions:

Issue #1:

[WARNING] 'dependencies.dependency.scope' for org.springframework.data:spring-data-releasetrain:pom must be one of [provided, compile, runtime, test, system] but is 'import'. @ line 70, column 18

Solution #1:

<dependency>
  <groupId>org.springframework.data</groupId>
  <artifactId>spring-data-releasetrain</artifactId>
  <version>Hopper-SR10</version>
  <type>pom</type>
  <!-- <scope>import</scope> -->
  <scope>provided</scope>  <!-- changed import to provided -->
</dependency>

Issue #2:

[ERROR] 'dependencies.dependency.version' for org.springframework.boot:spring-boot-devtools:jar is missing. @ line 73, column 19

Solution #2:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-devtools</artifactId>
  <version>${spring-boot-version}</version> <!-- You have missed to add this version -->
  <optional>true</optional>
</dependency>

Issue #3:

[ERROR] 'dependencies.dependency.version' for org.springframework.boot:spring-boot-configuration-processor:jar is missing. @ line 78, column 19

Solution #3:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-configuration-processor</artifactId>
  <version>${spring-boot-version}</version> <!-- You have missed to add this version -->
  <optional>true</optional>
</dependency>

Issue #4:

[WARNING] 'dependencies.dependency.scope' for com.amazonaws:aws-java-sdk-bom:pom must be one of [provided, compile, runtime, test, system] but is 'import'. @ line 105, column 18

Solution #4:

<dependency>
  <groupId>com.amazonaws</groupId>
  <artifactId>aws-java-sdk-bom</artifactId>
  <version>${aws-sdk-java-version}</version>
  <type>pom</type>
  <!-- <scope>import</scope> -->
  <scope>provided</scope> <!-- changed import to provided -->
</dependency>

Issue #5:

[ERROR] 'dependencies.dependency.version' for mysql:mysql-connector-java:jar is missing. @ line 148, column 19

Solution #5:

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.38</version> <!-- You have missed to add this version -->
</dependency>

Instead of @EnableAutoConfiguration, use @Configuration as below. Also you will need to fix aws region property as its differing in name between prop file and code - [amazon.dynamodb.region vs amazon.aws.region] - this will throw error once it starts picking up property file after below change.. 

@Configuration
@PropertySource("database.properties")
public class DynamoClientMapper {

    @Value("${amazon.dynamodb.endpoint}")
    private String amazonDynamoDBEndpoint;

    @Value("${amazon.aws.accesskey}")
    private String amazonAWSAccessKey;

    @Value("${amazon.aws.secretkey}")
    private String amazonAWSSecretKey;

    @Value("${amazon.aws.region}")
    private String amazonAWSRegion;

Tags:

Java

Spring

Spring Boot

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