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场景:
因为之前用到的是,基于springboot框架所搭建的maven工程,而且都是相互独立的。现研发经理要求将所有工程进行整合和规范化,所以抽出一个parent父工程,base基础模块(包含一些公用的实体类和工具类等),以及其他子模块(Module A、 Module B …)。Module A 以及Module B工程都需要依赖base工程。
问题:
在对Module A进行打包时,出现问题:Module A中所依赖的base工程的util程序包不存在。即使能打包成功,用java -jar启动jar包也会报Class Not Found,依赖的base工程的类找不到。
解决方案:
未解决之前在base工程的pom.xml中maven插件的配置如下:
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- </plugin>
- </plugins>
- </build>
解决base工程的pom.xml的maven配置如下:
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- <configuration>
- <classifier>exec</classifier>
- </configuration>
- </plugin>
- </plugins>
- </build>
原因分析:
spring-boot-maven-plugin打包出来的jar是不可依赖的
我们现在整合后的maven项目有一个parent工程,打包类型为pom,下面多个spring-boot工程作为它的module,分别为base和moduleA,moduleB。假如moduleA依赖于base。如果你在base中使用了spring-boot-maven-plugin的默认配置build,或者在parent工程中使用spring-boot-maven-plugin的默认配置build。那么在clean package的时候会发现moduleA找不到base中的类。原因就是默认打包出来的jar是不可依赖的。
解决方案:
- 官方告诉我们,你如果不想移代码,好吧,我这样来给你解决,给你打两个jar包,一个用来直接执行,一个用来依赖。于是,你需要指定一个属性classifier,这个属性为可执行jar包的名字后缀。比如我设置<classifier>exec</classifier>,原项目名为Vehicle-business。那么会得到两个jar:Vehicle-business.jar和Vehicle-bussiness-exec.jar
-
- 官方文档位置:84.5 Use a Spring Boot application as a dependency
-
- 总结:回到聚合maven上,如果你在parent工程中使用了spring-boot-maven-plugin作为builder,那么你的依赖module一定要用解决方案二来设置。否则你不在parent工程中用spring-boot-maven-plugin作为builder,而在需要打包的module上使用。
一般parent工程的maven插件配置如下:
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- <configuration>
- <source>1.8</source>
- <target>1.8</target>
- </configuration>
- <executions>
- <execution>
- <goals>
- <goal>repackage</goal>
- </goals>
- </execution>
- </executions>
- </plugin>
- </plugins>
- </build>

被依赖的maven子模块的maven插件配置如下(其余maven子模块就不需要配置):
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- <configuration>
- <classifier>exec</classifier>
- </configuration>
- </plugin>
- </plugins>
- </build>
其他的坑:
1.jdk8一定要指明
不指明的话在开发工具里运行没有一点问题,如果你没有用到java8的特性打包也没有问题。一旦你用到了java8的特性,而且使用spring-boot-maven-plugin作为builder,一定要指明jdk版本。不然你会收到类似不识别Lambda,请使用resource8这样的错误。
- <properties>
- <java.version>1.8</java.version>
- <maven.compiler.source>1.8</maven.compiler.source>
- <maven.compiler.target>1.8</maven.compiler.target>
- </properties>
2.BOOT-INF陷阱
- 这个问题就很恶心了。这个时候你已经打包成功,你会发现运行jar的时候报错为file not found,而且不告诉你是什么文件。你打开jar去看,发现需要的lib,配置文件,class一样也不缺。
-
- 其实这里要说一个概念,spring-boot在打包后,会把文件拷贝到BOOT-INF/Classes之下,这个时候你原来定义的扫描包路径将失效。而这个问题官方文档根本没讲,还是我没有看到。
-
- 这个陷阱在你使用packages定义扫描路径的时候等着你。或者获取工程下文件的时候。对于获取文件的话,可以在原路径前加上classes,当然你要区分开发环境或生产环境的话,你可以使用profile或者conditional来解决。如果是扫描包路径就恶心了,因为你加上classes之后,不报file not found了。而是不报错,只是警告你找不到hibernate的某些xml。但是你很可能根本没有使用hibernate。
参考博客:https://blog.csdn.net/guduyishuai/article/details/60968728
parent工程pom文件:
- <?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>1.5.6.RELEASE</version>
- </parent>
-
- <groupId>com.demo</groupId>
- <artifactId>demo-parent</artifactId>
- <packaging>pom</packaging>
- <version>1.0-SNAPSHOT</version>
-
- <modules>
- <module>demo-base</module>
- <module>demo-sync</module>
- <module>demo-pattern</module>
- </modules>
-
- <properties>
- <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
- <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
- <java.version>1.8</java.version>
- <springboot.version>1.5.6</springboot.version>
- </properties>
-
- <dependencies>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-devtools</artifactId>
- </dependency>
- <!--WEB层-->
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-web</artifactId>
- </dependency>
-
- <!--测试-->
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-test</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.cloud</groupId>
- <artifactId>spring-cloud-starter-eureka</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.cloud</groupId>
- <artifactId>spring-cloud-starter-ribbon</artifactId>
- </dependency>
-
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-actuator</artifactId>
- </dependency>
- <!-- framework启动器 模板引擎 -->
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-freemarker</artifactId>
- </dependency>
- <dependency>
- <groupId>redis.clients</groupId>
- <artifactId>jedis</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.data</groupId>
- <artifactId>spring-data-redis</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-redis</artifactId>
- <version>1.3.7.RELEASE</version>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-jdbc</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework</groupId>
- <artifactId>spring-aspects</artifactId>
- </dependency>
- <!-- Mybatis -->
- <dependency>
- <groupId>org.mybatis</groupId>
- <artifactId>mybatis</artifactId>
- <version>3.2.8</version>
- </dependency>
- <dependency>
- <groupId>org.mybatis</groupId>
- <artifactId>mybatis-spring</artifactId>
- <version>1.3.2</version>
- </dependency>
-
- <!--fastjson-->
- <dependency>
- <groupId>com.alibaba</groupId>
- <artifactId>fastjson</artifactId>
- <version>1.2.8</version>
- </dependency>
- <!-- 分页助手 -->
- <dependency>
- <groupId>com.github.pagehelper</groupId>
- <artifactId>pagehelper</artifactId>
- <version>3.7.5</version>
- </dependency>
- <dependency>
- <groupId>com.github.jsqlparser</groupId>
- <artifactId>jsqlparser</artifactId>
- <version>0.9.1</version>
- </dependency>
- <!-- 通用Mapper -->
- <dependency>
- <groupId>com.github.abel533</groupId>
- <artifactId>mapper</artifactId>
- <version>2.3.4</version>
- </dependency>
- <!-- MySql连接驱动 -->
- <dependency>
- <groupId>mysql</groupId>
- <artifactId>mysql-connector-java</artifactId>
- </dependency>
- <!-- 连接池 -->
- <dependency>
- <groupId>com.jolbox</groupId>
- <artifactId>bonecp-spring</artifactId>
- <version>0.8.0.RELEASE</version>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter</artifactId>
- <exclusions>
- <exclusion> <!-- exclude掉spring-boot的默认log配置 -->
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-logging</artifactId>
- </exclusion>
- </exclusions>
- </dependency>
- <!-- log4j日志 -->
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-log4j2</artifactId>
- </dependency>
-
- <!-- 有其他jar依赖log4j -->
- <dependency>
- <groupId>org.apache.logging.log4j</groupId>
- <artifactId>log4j-1.2-api</artifactId>
- <version>2.8.2</version>
- </dependency>
-
- <dependency>
- <groupId>com.lmax</groupId>
- <artifactId>disruptor</artifactId>
- <version>3.3.6</version>
- </dependency>
-
- <!-- https://mvnrepository.com/artifact/org.dom4j/dom4j -->
- <dependency>
- <groupId>org.dom4j</groupId>
- <artifactId>dom4j</artifactId>
- <version>2.1.0</version>
- </dependency>
-
- <!--在线文档-->
- <!--swagger本身不支持spring mvc的,springfox把swagger包装了一下,让他可以支持springmvc-->
- <dependency>
- <groupId>io.springfox</groupId>
- <artifactId>springfox-swagger2</artifactId>
- <version>2.6.1</version>
- </dependency>
- <dependency>
- <groupId>io.springfox</groupId>
- <artifactId>springfox-swagger-ui</artifactId>
- <version>2.6.1</version>
- </dependency>
- </dependencies>
-
- <dependencyManagement>
- <dependencies>
- <dependency>
- <groupId>org.springframework.cloud</groupId>
- <artifactId>spring-cloud-dependencies</artifactId>
- <version>Camden.SR7</version>
- <type>pom</type>
- <scope>import</scope>
- </dependency>
- </dependencies>
- </dependencyManagement>
- <build>
- <plugins>
- <!-- 资源文件拷贝插件 -->
- <plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-resources-plugin</artifactId>
- <configuration>
- <encoding>UTF-8</encoding>
- </configuration>
- </plugin>
- <!-- java编译插件 -->
- <plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-compiler-plugin</artifactId>
- <configuration>
- <source>1.8</source>
- <target>1.8</target>
- <encoding>UTF-8</encoding>
- </configuration>
- </plugin>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- </plugin>
- </plugins>
- </build>
-
- </project>

base工程pom文件:
- <?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">
-
- <artifactId>demo-base</artifactId>
- <modelVersion>4.0.0</modelVersion>
-
- <parent>
- <groupId>com.demo</groupId>
- <artifactId>demo-parent</artifactId>
- <version>1.0-SNAPSHOT</version>
- </parent>
-
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- <configuration>
- <classifier>exec</classifier>
- </configuration>
- </plugin>
- </plugins>
- </build>
-
- </project>

sync的pom文件:
- <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">
-
- <artifactId>demo-sync</artifactId>
- <modelVersion>4.0.0</modelVersion>
-
- <parent>
- <groupId>com.demo</groupId>
- <artifactId>demo-parent</artifactId>
- <version>1.0-SNAPSHOT</version>
- </parent>
-
- <dependencies>
- <dependency>
- <groupId>com.demo</groupId>
- <artifactId>demo-base</artifactId>
- <version>1.0-SNAPSHOT</version>
- </dependency>
- </dependencies>
-
- </project>

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