将 Vaadin/SpringBoot 部署为 WAR

Question

我正在尝试将最小的 Vaadin/SpringBoot 应用程序作为 WAR 文件部署到独立的 Tomcat 中。

如果我运行 gradle vaadinRun 并在 localhost:8080 下访问，一切正常，但是使用 gradle war 创建 WAR 文件，然后将其复制到我的 Tomcat 的 webapps 文件夹中会导致 404。不幸的是，Tomcat 日志不显示任何事物。尝试通过localhost:8080/hello-vaadin访问。

这是应用程序类本身：

package com.somecompany;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.boot.autoconfigure.*;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.boot.web.servlet.ServletComponentScan;
import com.vaadin.spring.annotation.EnableVaadin;

@ServletComponentScan
@SpringBootApplication
@EnableVaadin
public class Application extends SpringBootServletInitializer {

    public static void main(String[] args) throws Exception {
        configureApplication(new SpringApplicationBuilder()).run(args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
         return configureApplication(builder);
    }

    private static SpringApplicationBuilder configureApplication(SpringApplicationBuilder builder) {
        return builder.sources(Application.class);
    }

}

这是对应的 UI 类：

package com.somecompany;

import com.vaadin.annotations.Theme;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.UI;
import com.vaadin.ui.Grid;
import org.springframework.beans.factory.annotation.Autowired;
import com.vaadin.ui.Label;

@SpringUI
@Theme("valo")
public class HelloWorldUI extends UI {

    @Autowired
    public HelloWorldUI() {

    }

    @Override
    protected void init(VaadinRequest request) {
        setContent(new Label("Hello World!"));
    }

}

最后是我的 gradle 脚本：

plugins {
    id "java"
    id "com.devsoap.plugin.vaadin" version "1.2.4"
    id "org.springframework.boot" version "1.5.7.RELEASE"
}

jar {
    baseName = 'com.somecompany.hello-vaadin'
    version =  '0.0.1-SNAPSHOT'
}

apply plugin: 'war'

war {
    baseName = 'hello-vaadin'
    version =  '1.0'
}

springBoot {
    mainClass = 'com.somecompany.Application'
}

bootRepackage {
    mainClass = 'com.somecompany.Application'
}

repositories {
    jcenter()
    mavenCentral()
    maven { url "http://oss.sonatype.org/content/repositories/vaadin-snapshots/" }
    maven { url 'https://repo.spring.io/libs-release' }
    maven { url "https://repository.jboss.org/nexus/content/repositories/releases" }
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web")
    providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")
}

在一个接一个的教程之后，一定有一些我忽略的东西。但是什么，我看不出问题出在哪里？

高度赞赏的任何提示！

Answer 1

最后，我设法让它工作了。方法如下：

MyApplication.java

package com.somecompany;

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

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

MyServletInitializer.java

package com.somecompany;

import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.boot.builder.SpringApplicationBuilder;

public class MyServletInitializer extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(MyApplication.class);
    }
}

MyConfiguration.java

package com.somecompany;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Bean;

@Configuration
public class MyConfiguration {
    @Bean
    public String myLabelString() {
        return "Hello World Bean!";
    }
}

HelloWorldUI.java

package com.somecompany;

import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.UI;
import org.springframework.beans.factory.annotation.Autowired;
import com.vaadin.ui.Label;

@SpringUI
public class HelloWorldUI extends UI {

    @Autowired
    String helloWorldString;

    @Override
    protected void init(VaadinRequest request) {
        if (helloWorldString != null) {
            setContent(new Label(helloWorldString));
        } else {
            setContent(new Label("Injection does not work!"));
        }
    }
}

build.gradle

plugins {
    id 'com.devsoap.plugin.vaadin' version '1.2.1'
    id 'org.springframework.boot' version '1.5.3.RELEASE'
}

apply plugin: 'war'

war {
    baseName = 'hellovaadin'
}

springBoot {
    mainClass = 'com.somecompany.MyApplication'
}

然后使用gradle build 构建WAR 文件，然后将其复制到我的tomcat 实例的webapps 文件夹中。

我已经扩展了这个例子，还展示了如何注入/自动装配一个 bean。