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java - 10 SpringBoot项目使用maven，如何减小自己的jar大小？

问题描述

我们的项目有大约 10 个 SpingBoot 模块，我们使用 maven 来管理依赖关系。10罐大小约2G。最近我们需要减小 jar 的大小以方便我们的客户部署。

我有一个想法，提取常见的jar（不经常更改），例如spring-.jar，spring- boot- .jar，jodd*.jar，elasticsearch等。只要> = 2个项目使用相同的依赖，一个我们称之为“普通罐子”的罐子。

如果你知道一些有用的解决方案，请告诉我。

我尝试了下方法，但遇到了一些麻烦。

  1. 新建一个程序作为计算项目之间常见 artifactId 的工具，最后我得到了一个 artifactId 列表。

  2. 新建一个maven模块来打包常用依赖，最后得到一个包含常用jar文件的lib文件。我将它命名为“common-lib”。

  3. 更改旧项目的 pom 文件如下：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <configuration>
        <archive>
            <manifest>
                <mainClass>com.xx.MyManagerApplication</mainClass>
                <useUniqueVersions>false</useUniqueVersions>
                <addClasspath>true</addClasspath>
                <!--classpathPrefix let Manifest.MF's Class-Path add the 'common-lib' as prefix-->
                <classpathPrefix>common-lib/</classpathPrefix>
            </manifest>
            <manifestEntries>
                <Class-Path>.</Class-Path>
            </manifestEntries>
        </archive>
    </configuration>
</plugin>

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <mainClass>com.xx.MyManagerApplication</mainClass>
        <layout>ZIP</layout>
        <excludeArtifactIds>
            spring-webmvc,
            spring-web,
            spring-tx,
            spring-security-rsa,
            spring-security-crypto,
            spring-jdbc,
            spring-jcl,
            spring-expression,
            spring-core,
            spring-context,
            spring-cloud-starter-zipkin,
            ...ellipsis
        </excludeArtifactIds>
    </configuration>
    <executions>
        <execution>
            <goals>
                <goal>repackage</goal>
            </goals>
        </execution>
    </executions>
</plugin>

最后我的项目的 jar lib 只包含没有 common-lib。并且jar大小减少到900K（过去105M）。它大大减小了罐子的大小。

  1. 将myproject.jar和common-lib放在同一目录下
  • 公共库
    • 许多罐子...
  • 我的项目.jar

然后启动我的项目 java -Dspring.profiles.active=dev -Dspring.config.location=application.yml -jar my-project.jar

然而它并没有像我想象的那样工作。而是在控制台中显示错误消息

[2020-12-01 15:54:19.252+0800]-[foundation-manager]-[1;31m[ERROR][0;39m-[]-[8340:main] o.s.boot.SpringApplication               837 : Application run failed

java.lang.NoClassDefFoundError: groovy/lang/GroovyObject
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.springframework.boot.BeanDefinitionLoader.<init>(BeanDefinitionLoader.java:84)
        at org.springframework.boot.SpringApplication.createBeanDefinitionLoader(SpringApplication.java:745)
        at org.springframework.boot.SpringApplication.load(SpringApplication.java:685)
        at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:381)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:305)
        at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:137)
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:208)
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:104)
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:70)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:74)
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:338)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:297)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1242)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1230)
        at com.yealink.foundation.manager.app.FoundationManagerApplication.main(FoundationManagerApplication.java:44)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
        at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:593)
Caused by: java.lang.ClassNotFoundException: groovy.lang.GroovyObject
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 40 common frames omitted

groovy 的 lib 不是 common-lib，它存在于项目的 jar 中。原因是第 2 步我更改了 Manifest.MF 文件，所以 jvm 在 common-lib/groovy.xxx.jar 中找到 groovy 的库？

如果你知道一些有用的解决方案，请告诉我。

标签： javaspring-bootmaven

解决方案

我做了一些与你的设置类似的事情，但在我的情况下，它是为了优化 Docker 推送。

我的 spring-boot-maven-plugin 是不同的：

看看以下内容是否对您有帮助：

            <!-- This plugin copies different external dependencies into separate folders
                 that are later used to build an optimized Docker image -->
            <plugin>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-external-project-dependencies</id>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <includeScope>runtime</includeScope>
                            <excludeGroupIds>com.susan</excludeGroupIds>
                            <outputDirectory>${project.build.directory}/external-dependencies</outputDirectory>
                        </configuration>
                    </execution>
                    <execution>
                        <id>copy-hello-cloud-platform-dependencies</id>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <includeScope>runtime</includeScope>
                            <includeGroupIds>com.susan.hello.cloud-platform</includeGroupIds>
                            <outputDirectory>${project.build.directory}/cloud-dependencies</outputDirectory>
                        </configuration>
                    </execution>
                    <execution>
                        <id>copy-susan-project-dependencies</id>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <includeScope>runtime</includeScope>
                            <includeGroupIds>com.susan.ca.cc</includeGroupIds>
                            <outputDirectory>${project.build.directory}/susan-dependencies</outputDirectory>
                        </configuration>
                    </execution>
                    <execution>
                        <id>submodule-dependencies</id>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <includeScope>runtime</includeScope>
                            <includeGroupIds>com.susan</includeGroupIds>
                            <excludeGroupIds>com.susan.ca.cc,com.susan.hello.cloud-platform</excludeGroupIds>
                            <outputDirectory>${project.build.directory}/submodule-dependencies</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <id>build-info</id>
                    <goals>
                        <goal>build-info</goal>
                    </goals>
                </execution>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                    <configuration>
                        <skip>true</skip>
                    </configuration>
                </execution>
            </executions>
        </plugin>
            
            
            

        <plugin>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <classpathPrefix>lib/</classpathPrefix>
                        <mainClass>com.susan.hello.whee.HelloApplication</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>

复制 /susan/target/external-dependencies /lib

复制 /susan/target/hello-dependencies /lib

复制 /susan/target/cloud-dependencies /lib

复制 /susan/target/submodule-dependencies /lib

app.jar 在 /lib 之外

java - jar app.jar

这一切看起来都和你做的一样，我唯一能想到的就是 spring-boot-maven-plugin 设置。

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