来自将Spring Boot应用程序用作依赖性文档: 可执行归档文件不能用作依赖项，因为 可执行jar格式将应用程序类打包在BOOT-INF/classes中. 这意味着在使用可执行jar时找不到它们 作为依赖项. 要产生两个工件，一个可以用作依赖项， 一个可执行文件，必须指定一个分类器.这 分类器应用于可执行存档的名称，保留 用作依赖项的默认存档.<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <classifier>exec</classifier> </configuration> </plugin> </plugins></build>这里是一个例子:第一个jar是可依赖构建的，第二个是Spring Boot可执行文件.I have three very simple applilcations. One is COMMON which I will center security configs, other with ZUUL feature and the third is a EUREKA SERVER. Both are Spring Boot and Java 11. Although I am using Java 11 I am not reling on modularity (as far as I know it will not make sense use modularity feature with Spring Boot).When I run all three in Eclipse I successfully can run the server, common and zuul in that sequence. When I try to maven build I get the error mentioned in subject.The immediate explanation would be "you don't have common in zuul classpath". Well, as far as I check I do have common in zuul classpath. I am wondering if there is any extra config because I am using Java 11 but not using modularaty.By saying I am using Java 11 but not modularity I mean, I have Java 11 but I don't have module-info.java at all in any of the three projects.Checking in .m2 folder and unzip the common.jar I do see the class complained.Zuul project 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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <groupId>com.test</groupId> <artifactId>zuul</artifactId> <version>0.0.1-SNAPSHOT</version> <name>zuul</name> <description>Zuul project</description> <properties> <java.version>11</java.version> <spring-cloud.version>Greenwich.SR1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-zuul</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/io.jsonwebtoken/jjwt --> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt</artifactId> <version>0.9.1</version> </dependency> <dependency> <groupId>com.test</groupId> <artifactId>common</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</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>Evidence that common is the maven dependencesError during mvn clean install:[INFO] Scanning for projects...[INFO][INFO] ---------------------------< com.test:zuul >----------------------------[INFO] Building zuul 0.0.1-SNAPSHOT[INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ zuul ---[INFO] Using 'UTF-8' encoding to copy filtered resources.[INFO] Copying 1 resource[INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) @ zuul ---[INFO] Changes detected - recompiling the module![INFO] Compiling 2 source files to C:\_d\WSs\soteste\zuul\target\classes[INFO] -------------------------------------------------------------[ERROR] COMPILATION ERROR :[INFO] -------------------------------------------------------------[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[14,32] package com.test.common.security does not exist[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[21,17] cannot find symbol symbol: class JwtConfig location: class com.test.zuul.security.SecurityTokenConfig[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[46,16] cannot find symbol symbol: class JwtConfig location: class com.test.zuul.security.SecurityTokenConfig[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[47,23] cannot find symbol symbol: class JwtConfig location: class com.test.zuul.security.SecurityTokenConfig[INFO] 4 errors[INFO] -------------------------------------------------------------[INFO] ------------------------------------------------------------------------[INFO] BUILD FAILURE[INFO] ------------------------------------------------------------------------[INFO] Total time: 4.778 s[INFO] Finished at: 2019-03-21T14:23:23-03:00[INFO] ------------------------------------------------------------------------[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project zuul: Compilation failure: Compilation failure:[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[14,32] package com.test.common.security does not exist[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[21,17] cannot find symbol[ERROR] symbol: class JwtConfig[ERROR] location: class com.test.zuul.security.SecurityTokenConfig[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[46,16] cannot find symbol[ERROR] symbol: class JwtConfig[ERROR] location: class com.test.zuul.security.SecurityTokenConfig[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[47,23] cannot find symbol[ERROR] symbol: class JwtConfig[ERROR] location: class com.test.zuul.security.SecurityTokenConfig[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/MojoFailureExceptionThe class complained is in the jar*** EditedCommon 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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.test</groupId> <artifactId>common</artifactId> <version>0.0.1-SNAPSHOT</version> <name>common</name> <description>Zuul project</description> <properties> <java.version>11</java.version> <spring-cloud.version>Greenwich.SR1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</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> 解决方案 That's because the common project is a Spring Boot Application (I see the BOOT-INF folder inside the generated jar).From Use a Spring Boot Application as a Dependency documentation: The executable archive cannot be used as a dependency as the executable jar format packages application classes in BOOT-INF/classes. This means that they cannot be found when the executable jar is used as a dependency. To produce the two artifacts, one that can be used as a dependency and one that is executable, a classifier must be specified. This classifier is applied to the name of the executable archive, leaving the default archive for use as a dependency.<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <classifier>exec</classifier> </configuration> </plugin> </plugins></build>Here is an example:The first jar is build as dependency-able, the second one is Spring Boot executable. 这篇关于没有模块化的Java 11:作为maven依赖项添加时，该包不存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！
