将Spring Boot Uber JAR打包类设置为根目录，而不是启动

本文介绍了将Spring Boot Uber JAR打包类设置为根目录，而不是启动-INF/CLASS的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

嗨，春靴专家-

我正在尝试创建一个Spring Boot Uber JAR，该JAR需要部署到一个阿帕奇风暴集群。但是，问题是Storm预期所有类文件都在JAR的根目录中，而打包的应用程序文件在使用"Spring-ot-maven-plugin"打包时位于"boot-INF/Class"下。

有没有办法让我的应用程序类直接打包到根目录下，而不是"Boot-INF/CLASSES"？

我试着将"maven-Assembly-plugin"与"Spring-ot-maven-plugin"一起使用，如下所示，它使用Uber JAR根目录下打包的依赖项JAR中的所有类文件创建Uber JAR，但应用程序类仍然位于Boot-INF/Class。

<plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <excludes> <exclude> <groupId>org.apache.storm</groupId> <artifactId>storm-core</artifactId> </exclude> </excludes> <requiresUnpack> <dependency> <groupId>com.myorg</groupId> <artifactId>my-app-artifact</artifactId> <!-- This does not help! :( --> </dependency> </requiresUnpack> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-assembly-plugin</artifactId> <version>2.4</version> <configuration> <appendAssemblyId>false</appendAssemblyId> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> <executions> <execution> <id>make-assembly</id> <phase>package</phase> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> 推荐答案

所以，对于我未来的自己或任何试图找到类似问题的答案的人来说。以下是我在研究这件事时意识到的不同事情-

Storm需要可执行的Java JAR文件

Spring Boot提供了定制的JAR打包。虽然它与Java JAR打包相一致，但Spring Boot从boot-INF/Class加载类

因此，要使Spring Boot JAR在风暴集群上工作，同时充当Spring Boot-我们需要创建从BOOT-INF/CLASS到JAR文件根目录的所有类的副本。

这可能吗？答案是肯定的。

使用方法Describehere，我能够创建一个Spring Boot JAR，并将Boot-INF/Class复制到Spring Boot JAR的根目录。这种方法需要ant Build.xml、Ivy设置和ivy.xml，如下所示。(免责声明：仅在打包打开之前测试配置，不在Storm群集上)

因为我们能够创建一个Spring Boot Jar，它在根目录使用类-

我们应该这样做吗？否。

以下是原因-

Spring强烈建议不要采用这种方法，以免在不同版本的JAR文件中出现同名类的不必要的类覆盖和类版本控制问题。

Spring Boot Jar打包不是一种旨在用作依赖JAR的格式。Read the first line here.因此，对于依赖用例，您需要坚持使用普通的老式Java模块。Spring Boot用于更多独立的可执行文件或部署在Tomcat等容器上。

祝你好运！

Build.xml

<project xmlns:ivy="antlib:org.apache.ivy.ant" xmlns:spring-boot="antlib:org.springframework.boot.ant" name="spring-boot-sample-ant" default="build"> <description> Sample ANT build script for a Spring Boot executable JAR project. Uses ivy for dependency management and spring-boot-antlib for additional tasks. Run with '$ ant -lib ivy-2.2.jar spring-boot-antlib.jar' (substitute the location of your actual jars). Run with '$ java -jar target/*.jar'. </description> <property name="spring-boot.version" value="1.4.2.RELEASE" /> <property name="lib.dir" location="${basedir}/target/lib" /> <property name="start-class" value="com.my.main.class" /> <target name="resolve" description="--> retrieve dependencies with ivy"> <ivy:retrieve pattern="${lib.dir}/[conf]/[artifact]-[type]-[revision].[ext]" /> </target> <target name="classpaths" depends="resolve"> <path id="compile.classpath"> <fileset dir="${lib.dir}/compile" includes="*.jar" /> </path> </target> <target name="init" depends="classpaths"> <mkdir dir="target/classes" /> </target> <target name="compile" depends="init" description="compile"> <javac srcdir="src/main/java" destdir="target/classes" classpathref="compile.classpath" /> </target> <target name="clean" description="cleans all created files/dirs"> <delete dir="target" /> </target> <target name="build" depends="compile"> <spring-boot:exejar destfile="target/${ant.project.name}-${spring-boot.version}.jar" classes="target/classes"> <spring-boot:lib> <fileset dir="${lib.dir}/runtime" /> </spring-boot:lib> </spring-boot:exejar> </target> <target name="unjar_dependencies" depends="compile"> <unzip dest="target/classes"> <fileset dir="${lib.dir}/compile"> <include name="my-app-common-0.1-SNAPSHOT.jar" /> </fileset> </unzip> </target> <!-- Manual equivalent of the build target --> <target name="manual" depends="compile, unjar_dependencies"> <jar destfile="target/manual/${ant.project.name}-${spring-boot.version}.jar" compress="false"> <mappedresources> <fileset dir="target/classes" /> <globmapper from="*" to="BOOT-INF/classes/*"/> </mappedresources> <mappedresources> <!-- **** this mapped resources block does what I was looking for **** --> <fileset dir="target/classes" /> <globmapper from="*" to="/*"/> </mappedresources> <mappedresources> <fileset dir="src/main/resources" erroronmissingdir="false"/> <globmapper from="*" to="BOOT-INF/classes/*"/> </mappedresources> <mappedresources> <fileset dir="${lib.dir}/runtime" /> <globmapper from="*" to="BOOT-INF/lib/*"/> </mappedresources> <zipfileset src="${lib.dir}/loader/spring-boot-loader-jar-${spring-boot.version}.jar" /> <manifest> <attribute name="Main-Class" value="org.springframework.boot.loader.JarLauncher" /> <attribute name="Start-Class" value="${start-class}" /> </manifest> </jar> </target> </project>

ivysettings.xml

<ivysettings> <settings defaultResolver="chain" /> <resolvers> <chain name="chain" returnFirst="true"> <!-- NOTE: You should declare only repositories that you need here --> <filesystem name="local" local="true" m2compatible="true"> <artifact pattern="${user.home}/.m2/repository/[organisation]/[module]/[revision]/[module]-[revision].[ext]" /> <ivy pattern="${user.home}/.m2/repository/[organisation]/[module]/[revision]/[module]-[revision].pom" /> </filesystem> <ibiblio name="ibiblio" m2compatible="true" /> <ibiblio name="spring-milestones" m2compatible="true" root="repo.spring.io/release" /> <ibiblio name="spring-milestones" m2compatible="true" root="repo.spring.io/milestone" /> <ibiblio name="spring-snapshots" m2compatible="true" root="repo.spring.io/snapshot" /> </chain> </resolvers> </ivysettings>

ivy.xml

<ivy-module version="2.0"> <info organisation="org.springframework.boot" module="spring-boot-sample-ant" /> <configurations> <conf name="compile" description="everything needed to compile this module" /> <conf name="runtime" extends="compile" description="everything needed to run this module" /> <conf name="loader" description="Spring Boot loader used when manually building an executable archive" /> </configurations> <dependencies> <dependency org="org.springframework.boot" name="spring-boot-starter" rev="${spring-boot.version}" conf="compile"> <exclude org="ch.qos.logback" name="logback-classic"/> </dependency> <dependency org="org.springframework.boot" name="spring-boot-loader" rev="${spring-boot.version}" conf="loader->default" /> <dependency org="org.apache.storm" name="storm-core" rev="1.0.2"> <exclude org="org.apache.logging.log4j" name="log4j-slf4j-impl"/> <exclude org="org.apache.logging.log4j" name="log4j-core"/> </dependency> <dependency org="com.mycompany" name="app-common" rev="0.1-SNAPSHOT"/> <dependency org="org.apache.storm" name="storm-kafka" rev="1.0.2"/> <dependency org="org.apache.kafka" name="kafka_2.10" rev="0.10.1.0"/> <dependency org="org.apache.kafka" name="kafka_2.10" rev="0.10.1.0"/> <dependency org="org.apache.httpcomponents" name="httpcomponents-client" rev="4.5.2"/> <dependency org="org.eclipse.paho" name="org.eclipse.paho.client.mqttv3" rev="1.1.0"/> <dependency org="com.amazonaws" name="aws-java-sdk-s3" rev="1.11.53"/> <dependency org="com.jcraft" name="jsch" rev="0.1.54"/> <dependency org="ioty" name="netty-handler" rev="3.7.0.Final"/> </dependencies> </ivy-module>