将Spring Boot Uber JAR打包类设置为根目录，而不是启动-INF/CLASS [英] Spring Boot uber jar packaging classes to root instead of BOOT-INF/classes
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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="${user.home}/.m2/repository/[organisation]/[module]/[revision]/[module]-[revision].pom" />
</filesystem>
<ibiblio name="ibiblio" m2compatible="true" />
<ibiblio name="spring-milestones" m2compatible="true" root="http://repo.spring.io/release" />
<ibiblio name="spring-milestones" m2compatible="true" root="http://repo.spring.io/milestone" />
<ibiblio name="spring-snapshots" m2compatible="true" root="http://repo.spring.io/snapshot" />
</chain>
</resolvers>
</ivysettings>
ivy.xml
<ivy-module version="2.0">
<info organisation="org.springframework.boot" module="spring-boot-sample-ant" />
<configurations>
<conf name="compile" description="everything needed to compile this module" />
<conf name="runtime" extends="compile" description="everything needed to run this module" />
<conf name="loader" description="Spring Boot loader used when manually building an executable archive" />
</configurations>
<dependencies>
<dependency org="org.springframework.boot" name="spring-boot-starter" rev="${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="io.netty" name="netty-handler" rev="3.7.0.Final"/>
</dependencies>
</ivy-module>
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