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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
343
In my case I just delete "devtools" dependency.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
And it works!
153
I made the following changes to make mvn clean spring-boot:run work:
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
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.
28
Sometimes the port might just be already in use, make sure you kill all java processes before running an application.
39
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