Spring Boot应用程序失败-错误java包不存在

Question

我有一个引用外部模块来执行结果的 Spring Boot 项目。

我已经在模块依赖下添加了外部模块：

但是，当我运行 Spring Boot 应用程序时，它会失败并出现以下错误： Error:(3, 16) java: package examples does not exist

以下源代码中的CustomerLossPrediction 引用外部模块并调用此模块失败，即使我将模块添加到项目工作区并正确添加了依赖项。

package com.example.demo.service;

import examples.CustomerLossPrediction;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;

@Service
public class DL4JServiceImpl implements DL4JService {
    @Override
    public String fetchPrediction(MultipartFile file) throws IOException, InterruptedException {
        File convFile = new File( file.getOriginalFilename());
        file.transferTo(convFile);
        INDArray array = new CustomerLossPrediction().generateOutput(convFile);
        return array.toString();
    }
}

如果需要，这里是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>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
<!--        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.nd4j</groupId>
            <artifactId>nd4j-api</artifactId>
            <version>0.8.0</version>
        </dependency>
    </dependencies>

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


</project>

我认为这是因为我试图引用某个外部模块，或者另一个无法从 Spring Boot 模块中引用？

Answer 1

您必须将该外部模块添加为 Maven 依赖项。如果你不这样做，即使你设法从 IDE 运行它，它也将无法使用 Maven 构建。

在这里，您已经解释了如何将 JAR 安装为 Maven 工件。当您这样做时，将其作为依赖项包含在 POM 中

https://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html