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我想使用来自 NetFlix 的外观精美的DGS 框架对 GraphQL 服务进行客户端调用。

我发现的所有示例都假设我正在构建一个服务，并且Java GraphQL 客户端是作为事后才引入的。

我要从中调用服务的应用程序只是一个控制台应用程序。它不需要网络服务器，不需要dgsQueryExecutor架构。然而，当我运行我的应用程序时，它会出现大量关于这些需要的运行时错误。

我是 Java/Maven/SpringBoot 世界中的一个相对新手，并且仍在为事情的启动概念而苦苦挣扎，而无需我询问他们；并删除依赖项。

这是我的 pom.xml：

<?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>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.7.RELEASE</version>
        <relativePath/>
    </parent>

    <groupId>io.m.t</groupId>
    <artifactId>t-l-g-m</artifactId>
    <version>${revision}</version>

    <properties>
        <revision>1.0.0-SNAPSHOT</revision>
        <java.version>11</java.version>
        <maven.compiler.release>${java.version}</maven.compiler.release>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.25</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.12.4</version>
        </dependency>

        <dependency>
            <groupId>com.netflix.graphql.dgs</groupId>
            <artifactId>graphql-dgs-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.netflix.graphql.dgs</groupId>
                <artifactId>graphql-dgs-platform-dependencies</artifactId>
                <!-- The DGS BOM/platform dependency. This is the only place you set version of DGS -->
                <version>4.5.0</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

这是我的主要课程（注意：它实际上还没有做任何事情，我只是希望它运行没有错误）。

package io.m.t.l.g;

import io.m.t.l.g.config.DatabaseConfig;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.WebApplicationType;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;

/**
 * 1. Act as main class for spring boot application
 * 2. Also implements CommandLineRunner, so that code within run method
 * is executed before application startup but after all beans are effectively created
 */
@SpringBootApplication
@Slf4j
public class MyConsoleApplication implements CommandLineRunner {

    public static void main(String[] args) {
        log.info("STARTING THE APPLICATION");
        new SpringApplicationBuilder(MyConsoleApplication.class)
                .web(WebApplicationType.NONE)
                .run(args);
        // NOTE: different from the usual to prevent Tomcat from starting (not needed in console app)
        //SpringApplication.run(MyConsoleApplication.class, args);
        log.info("APPLICATION FINISHED");
    }

    /**
     * This method will be executed after the application context is loaded and
     * right before the Spring Application main method is completed.
     */
    @Override
    public void run(String... args) {

        log.info("For now, I just want to get to this line without runtime errors.");
    }        
}
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