构建spring boot项目时出错[重复]

Posted 2023-02-26

【中文标题】构建spring boot项目时出错[重复]

【英文标题】：Error while building spring boot project [duplicate]

【发布时间】：2018-02-20 20:58:30

【问题描述】：

我无法构建我的 springboot 项目， 我正在使用另一个 springboot jar 中的类，我将其放在构建路径上，它通过 eclipse 在本地运行，但没有构建，这是错误

"[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building ContentManagementService 0.0.1
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ contentmanagementapi ---
[INFO] Deleting /home/bhargavgundu/git/contentmanagementservice/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ contentmanagementapi ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 5 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ contentmanagementapi ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 42 source files to /home/bhargavgundu/git/contentmanagementservice/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[32,31] package com.conduiraonline.apis does not exist
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[42,31] package com.conduiraonline.daos does not exist
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[52,35] cannot find symbol
  symbol:   class SlackService
  location: package com.conduiraonline.services
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[85,17] cannot find symbol
  symbol:   class UserDAO
  location: class com.conduiraonline.controller.ContentManagementControllerV1
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[87,17] cannot find symbol
  symbol:   class SlackService
  location: class com.conduiraonline.controller.ContentManagementControllerV1
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[95,17] cannot find symbol
  symbol:   class LicenseV5
  location: class com.conduiraonline.controller.ContentManagementControllerV1
[INFO] 6 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.917s
[INFO] Finished at: Tue Sep 12 17:16:44 IST 2017
[INFO] Final Memory: 24M/396M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project contentmanagementapi: Compilation failure: Compilation failure:
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[32,31] package com.conduiraonline.apis does not exist
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[42,31] package com.conduiraonline.daos does not exist
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[52,35] cannot find symbol
[ERROR] symbol:   class SlackService
[ERROR] location: package com.conduiraonline.services
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[85,17] cannot find symbol
[ERROR] symbol:   class UserDAO
[ERROR] location: class com.conduiraonline.controller.ContentManagementControllerV1
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[87,17] cannot find symbol
[ERROR] symbol:   class SlackService
[ERROR] location: class com.conduiraonline.controller.ContentManagementControllerV1
[ERROR] /home/bhargavgundu/git/contentmanagementservice/src/main/java/com/conduiraonline/controller/ContentManagementControllerV1.java:[95,17] cannot find symbol
[ERROR] symbol:   class LicenseV5
[ERROR] location: class com.conduiraonline.controller.ContentManagementControllerV1
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
"

无论我在哪里使用外部 jar 中的类/函数，它都会显示错误，有人可以帮忙吗？ 我的POM-

这是我的 POM

<?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.conduiraonline</groupId>
    <artifactId>contentmanagementapi</artifactId>
    <version>0.0.1</version>
    <packaging>jar</packaging>

    <name>ContentManagementService</name>
    <description>ContentManagementService</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.3.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.mail/mail -->
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>com.conduiraonline</groupId>
            <artifactId>licenseapi</artifactId>
            <version>0.0.1</version>
            <classifier>exec</classifier>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>21.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <executable>true</executable>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

【问题讨论】：

编译时出错，检查是否包含必要的JAR文件，添加的JAR文件是否足够？

你需要在你的pom中添加你的外部jar的maven依赖

@cralfaro 我确实添加了它，检查具有“licenseapi”的行

添加编译

每当您想将 jar 添加到项目中时，请将其作为依赖项添加到项目中，而不是将其添加到构建路径中，因为如果存储库中没有依赖项，maven 将无法识别构建路径 jar创建 maven 依赖脚本 ***.com/questions/4955635/… 并在类路径级别运行它

【参考方案1】：

您必须在 gradle 或 maven 构建文件中添加 jars/包含 jars 的文件夹的路径。

例如在 gradle 中添加

    compile fileTree(dir: 'path_to_ext_libs', include: '*.jar')

到 build.gradle 中的依赖项，然后将包含 libs 文件夹中的所有 jar。

或者在maven中

<repositories>
   <repository>
     <id>local-files</id>
     <name>local-files</name>
     <url>file://c:\test\filerepo</url>
  </repository>

【讨论】：

你能告诉我如何在 maven 中做到这一点吗？是不是和在POM中添加一样？

我从构建路径添加了 jar，它出现在“引用的库”中，应该可以正常工作吗？

信任 gradle 或 maven 或信任您的 IDE。

【参考方案2】：

TL;DR

从对com.conduiraonline:licenseapi的依赖中移除<classifier>exec</classifier>

更多详情...

你用<dependency>来表达com.conduiraonline:contentmanagementapi和com.conduiraonline:licenseapi之间的关系是正确的。或者换一种说法；这是告诉 Maven 模块 com.conduiraonline:contentmanagementapi 依赖于模块 com.conduiraonline:licenseapi 的正确方法。

但是，您已将com.conduiraonline:licenseapi 的依赖定义为：

    <dependency>
        <groupId>com.conduiraonline</groupId>
        <artifactId>licenseapi</artifactId>
        <version>0.0.1</version>
        <classifier>exec</classifier>
    </dependency>

classifier 告诉 Maven 在本地 Maven 存储库中的 com/conduiraonline 文件夹中查找名为 licenseapi.exec 的文件（如果失败，请尝试从您在 Maven 设置中配置的任何远程存储库中解决该依赖关系.xml 或在这个 pom.xml 中）。

我认为在本地 Maven 存储库中的文件夹 com/conduiraonline 中没有名为 licenseapi.exec 的文件，因为 exec 是一个非常不寻常的 Maven 工件分类器。

只要在您的本地 Maven 存储库中安装了版本为 0.0.1 的 com.conduiraonline:licenseapi 的 JAR，此依赖项就可以工作：

    <dependency>
        <groupId>com.conduiraonline</groupId>
        <artifactId>licenseapi</artifactId>
        <version>0.0.1</version>
    </dependency>

您通过为licenseapi 模块运行mvn clean install，在本地Maven 存储库中为com.conduiraonline:licenseapi 安装一个版本为0.0.1 的JAR（假设licenseapi 模块的pom.xml 具有<version>0.0.1</version>） .

【讨论】：

这行得通，谢谢 :) 我有一个疑问，一旦我这样做了，那个 jar 就不需要出现在类路径上，对吗？

通过声明该依赖项，您是在告诉 Maven com.conduiraonline:contentmanagementapi 对 com.conduiraonline:licenseapi 具有编译依赖项。我不完全确定您所说的“该 jar 不需要出现在类路径上”是什么意思，但是通过声明该依赖关系，您是在说您 确实希望 JAR 出现在 classapth 上。