Could not exec java with Spring+Maven exit code 1

I am new to Spring/Maven, and am following this tutorial: Serving Web Content with Spring MVC.

Everytime I run mvn spring-boot:run, I get this error:

Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:run (default-cli) on project gs-serving-web-content: Could not exec java: Application finished with exit code: 1 ->

I tried to add classpath, tried to run mvn install clean spring-boot:run, did a lot of other things that people suggested on stackoverflow in similar situations, spent on this more than 8 hours – no use.

Here is my main class Application.java:

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

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

Here is my GreeetingController.java class:

package hello;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class GreetingController {

    @RequestMapping("/greeting")
    public String greeting(@RequestParam(value="name", required=false, defaultValue="World") String name, Model model) {
        model.addAttribute("name", name);
        return "greeting";
    }

}

Here is my pom.xml 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>org.springframework</groupId>
    <artifactId>gs-serving-web-content</artifactId>
    <version>0.1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!-- Exclusions to allow SpringBoot execute on HCP -->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.tomcat.embed</groupId>
                    <artifactId>tomcat-embed-el</artifactId>
                </exclusion>
                <exclusion>
                    <artifactId>logback-classic</artifactId>
                    <groupId>ch.qos.logback</groupId>
                </exclusion>
            </exclusions>
        </dependency>

    </dependencies>

    <properties>
        <java.version>1.8</java.version>
        <!-- The main class to start by executing java -jar -->


    </properties>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                                    <mainClass>hello.Application</mainClass>

        <archive>
            <manifest>
                <addClasspath>true</addClasspath>
            </manifest>
        </archive>
    </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Here is my HTML template:

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Getting Started: Serving Web Content</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
    <p th:text="'Hello, ' + ${name} + '!'" />
</body>
</html>

The structure of a project is

src/main/java/hello/pom.xml
src/main/java/hello/Application.java
src/main/java/hello/GreetingController.java
src/main/resources/templates/greeting.html

Answer

I made the following changes to make mvn clean spring-boot:run work:

Move pom.xml to the root directory, which makes the directory hierarchy to be:

Directory hierarchy:

.
├── pom.xml
└── src
    └── main
        ├── java
        │   └── hello
        │       ├── Application.java
        │       └── GreetingController.java
        └── resources
            └── templates
                └── greeting.html

Commented out the exclusions in the following part:

Commented out part:

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <!-- Exclusions to allow SpringBoot execute on HCP -->
        <!--<exclusions>-->
            <!--<exclusion>-->
                <!--<groupId>org.springframework.boot</groupId>-->
                <!--<artifactId>spring-boot-starter-tomcat</artifactId>-->
            <!--</exclusion>-->
            <!--<exclusion>-->
                <!--<groupId>org.apache.tomcat.embed</groupId>-->
                <!--<artifactId>tomcat-embed-el</artifactId>-->
            <!--</exclusion>-->
            <!--<exclusion>-->
                <!--<artifactId>logback-classic</artifactId>-->
                <!--<groupId>ch.qos.logback</groupId>-->
            <!--</exclusion>-->
        <!--</exclusions>-->
    </dependency>

It seems you meant to exclude those dependencies. mvn clean spring-boot:run will just exit successfully if the embed tomcat is excluded, but I think this is the correct behave because there’s no container to deploy the application. Anyway, you can try it out and make changes according your requirements.

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Answer