使用带有minimizeJar = true的阴影时出现NullPointerException

Question

使用带有minimizeJar = true的阴影时出现NullPointerException

ber*_*rdt 3 java maven maven-shade-plugin

当使用 shade 和 minimumJar 时，我从 shade 插件中得到一个 NullpointerException 。

在下面的示例中，我定义了两个依赖项；junit 和 commons-lang3，在我的代码中只使用来自 commons-lang3 - 的单个类StringUtils。我对 shade 文档的理解是未使用的类不会包含在阴影 jar 中，所以我希望阴影 jar 只包含我的类和 StringUtils。

运行时，mvn clean package我得到以下输出（此问题末尾包含 mvn clean package -X 的完整输出）：

[错误] 无法执行目标 org.apache.maven.plugins:maven-shade-plugin:2.4.3:shade (default) on project shade: Error creation shaded jar: null: NullPointerException -> [Help 1]

这是在使用以下版本运行时：

mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T16:41:47+00:00)
Maven home: /usr/local/Cellar/maven/3.3.9/libexec
Java version: 1.8.0, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.10.5", arch: "x86_64", family: "mac"

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pom.xml - 该插件在我的 pom 中定义与apache 提供的 shade文档完全一样：

<?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>
    <groupId>shade</groupId>
    <artifactId>shade</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.4.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <minimizeJar>true</minimizeJar>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

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src/main/java/A.java

public class A {
    public static void main(String[] args) {
        System.out.println(StringUtils.capitalize("Using a StringUtilsClass"));
    }
}

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全输出 mvn clean package -X

localhost:shade tom$ mvn clean install -X
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T16:41:47+00:00)
Maven home: /usr/local/Cellar/maven/3.3.9/libexec
Java version: 1.8.0, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.10.5", arch: "x86_64", family: "mac"
[DEBUG] Created new class realm maven.api
[DEBUG] Importing foreign packages into class realm maven.api
[DEBUG]   Imported: javax.enterprise.inject.* < plexus.core
[DEBUG]   Imported: javax.enterprise.util.* < plexus.core
[DEBUG]   Imported: javax.inject.* < plexus.core
[DEBUG]   Imported: org.apache.maven.* < plexus.core
[DEBUG]   Imported: org.apache.maven.artifact < plexus.core
[DEBUG]   Imported: org.apache.maven.classrealm < plexus.core
[DEBUG]   Imported: org.apache.maven.cli < plexus.core
[DEBUG]   Imported: org.apache.maven.configuration < plexus.core
[DEBUG]   Imported: org.apache.maven.exception < plexus.core
[DEBUG]   Imported: org.apache.maven.execution < plexus.core
[DEBUG]   Imported: org.apache.maven.execution.scope < plexus.core
[DEBUG]   Imported: org.apache.maven.lifecycle < plexus.core
[DEBUG]   Imported: org.apache.maven.model < plexus.core
[DEBUG]   Imported: org.apache.maven.monitor < plexus.core
[DEBUG]   Imported: org.apache.maven.plugin < plexus.core
[DEBUG]   Imported: org.apache.maven.profiles < plexus.core
[DEBUG]   Imported: org.apache.maven.project < plexus.core
[DEBUG]   Imported: org.apache.maven.reporting < plexus.core
[DEBUG]   Imported: org.apache.maven.repository < plexus.core
[DEBUG]   Imported: org.apache.maven.rtinfo < plexus.core
[DEBUG]   Imported: org.apache.maven.settings < plexus.core
[DEBUG]   Imported: org.apache.maven.toolchain < plexus.core
[DEBUG]   Imported: org.apache.maven.usability < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.* < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.authentication < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.authorization < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.events < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.observers < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.proxy < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.repository < plexus.core
[DEBUG]   Imported: org.apache.maven.wagon.resource < plexus.core
[DEBUG]   Imported: org.codehaus.classworlds < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.* < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.classworlds < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.component < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.configuration < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.container < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.context < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.lifecycle < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.logging < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.personality < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.Xpp3Dom < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.pull.XmlPullParser < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.pull.XmlPullParserException < plexus.core
[DEBUG]   Imported: org.codehaus.plexus.util.xml.pull.XmlSerializer < plexus.core
[DEBUG]   Imported: org.eclipse.aether.* < plexus.core
[DEBUG]   Imported: org.eclipse.aether.artifact < plexus.core
[DEBUG]   Imported: org.eclipse.aether.collection < plexus.core
[DEBUG]   Imported: org.eclipse.aether.deployment < plexus.core
[DEBUG]   Imported: org.eclipse.aether.graph < plexus.core
[DEBUG]   Imported: org.eclipse.aether.impl < plexus.core
[DEBUG]   Imported: org.eclipse.aether.installation < plexus.core
[DEBUG]   Imported: org.eclipse.aether.internal.impl < plexus.core
[DEBUG]   Imported: org.eclipse.aether.metadata < plexus.core
[DEBUG]   Imported: org.eclipse.aether.repository < plexus.core
[DEBUG]   Imported: org.eclipse.aether.resolution < plexus.core
[DEBUG]   Imported: org.eclipse.aether.spi < plexus.core
[DEBUG]   Imported: org.eclipse.aether.transfer < plexus.core
[DEBUG]   Imported: org.eclipse.aether.version < plexus.core
[DEBUG]   Imported: org.slf4j.* < plexus.core
[DEBUG]   Imported: org.slf4j.helpers.* < plexus.core
[DEBUG]   Imported: org.slf4j.spi.* < plexus.core
[DEBUG] Populating class realm maven.api
[INFO] Error stacktraces are turned on.
[DEBUG] Reading global settings from /usr/local/Cellar/maven/3.3.9/libexec/conf/settings.xml
[DEBUG] Reading user settings from /Users/tom/.m2/settings.xml
[DEBUG] Reading global toolchains from /usr/local/Cellar/maven/3.3.9/libexec/conf/toolchains.xml
[DEBUG] Reading user toolchains from /Users/tom/.m2/toolchains.xml
[DEBUG] Using local repository at /Users/tom/.m2/repository
[DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10.0 for /Users/tom/.m2/repository
[INFO] Scanning for projects...
[DEBUG] Extension realms for project shade:shade:pom:1.0-SNAPSHOT: (none)
[DEBUG] Looking up lifecyle mappings for packaging pom from ClassRealm[plexus.core, parent: null]
[DEBUG] === REACTOR BUILD PLAN ================================================
[DEBUG] Project: shade:shade:pom:1.0-SNAPSHOT
[DEBUG] Tasks:   [clean, install]
[DEBUG] Style:   Regular
[DEBUG] =======================================================================
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building shade 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] Lifecycle default -> [validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy]
[DEBUG] Lifecycle clean -> [pre-clean, clean, post-clean]
[DEBUG] Lifecycle site -> [pre-site, site, post-site, site-deploy]
[DEBUG] === PROJECT BUILD PLAN ================================================
[DEBUG] Project:       shade:shade:1.0-SNAPSHOT
[DEBUG] Dependencies (collect): []
[DEBUG] Dependencies (resolve): [runtime]
[DEBUG] Repositories (dependencies): [central (https://repo.maven.apache.org/maven2, default, releases)]
[DEBUG] Repositories (plugins)     : [central (https://repo.maven.apache.org/maven2, default, releases)]
[DEBUG] -----------------------------------------------------------------------
[DEBUG] Goal:          org.apache.maven.plugins:maven-clean-plugin:2.5:clean (default-clean)
[DEBUG] Style:         Regular
[DEBUG] Configuration: <?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <directory default-value="${project.build.directory}"/>
  <excludeDefaultDirectories default-value="false">${clean.excludeDefaultDirectories}</excludeDefaultDirectories>
  <failOnError default-value="true">${maven.clean.failOnError}</failOnError>
  <followSymLinks default-value="false">${clean.followSymLinks}</followSymLinks>
  <outputDirectory default-value="${project.build.outputDirectory}"/>
  <reportDirectory default-value="${project.reporting.outputDirectory}"/>
  <retryOnError default-value="true">${maven.clean.retryOnError}</retryOnError>
  <skip default-value="false">${clean.skip}</skip>
  <testOutputDirectory default-value="${project.build.testOutputDirectory}"/>
  <verbose>${clean.verbose}</verbose>
</configuration>
[DEBUG] -----------------------------------------------------------------------
[DEBUG] Goal:          org.apache.maven.plugins:maven-shade-plugin:2.4.3:shade (default)
[DEBUG] Style:         Regular
[DEBUG] Configuration: <?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <createDependencyReducedPom default-value="true"/>
  <dependencyReducedPomLocation default-value="${basedir}/dependency-reduced-pom.xml"/>
  <generateUniqueDependencyReducedPom default-value="false"/>
  <localRepository default-value="${localRepository}"/>
  <minimizeJar>true</minimizeJar>
  <outputDirectory default-value="${project.build.directory}"/>
  <project default-value="${project}"/>
  <remoteArtifactRepositories default-value="${project.remoteArtifactRepositories}"/>
  <session default-value="${session}"/>
  <shadeSourcesContent default-value="false">${shadeSourcesContent}</shadeSourcesContent>
  <shadeTestJar default-value="false"/>
  <shadedArtifactId default-value="${project.artifactId}"/>
  <shadedClassifierName default-value="shaded"/>
  <useBaseVersion default-value="false"/>
</configuration>
[DEBUG] -----------------------------------------------------------------------
[DEBUG] Goal:          org.apache.maven.plugins:maven-install-plugin:2.4:install (default-install)
[DEBUG] Style:         Regular
[DEBUG] Configuration: <?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <artifact default-value="${project.artifact}"/>
  <attachedArtifacts default-value="${project.attachedArtifacts}"/>
  <createChecksum default-value="false">${createChecksum}</createChecksum>
  <localRepository>${localRepository}</localRepository>
  <packaging default-value="${project.packaging}"/>
  <pomFile default-value="${project.file}"/>
  <skip default-value="false">${maven.install.skip}</skip>
  <updateReleaseInfo default-value="false">${updateReleaseInfo}</updateReleaseInfo>
</configuration>
[DEBUG] =======================================================================
[DEBUG] Dependency collection stats: {ConflictMarker.analyzeTime=2, ConflictMarker.markTime=0, ConflictMarker.nodeCount=4, ConflictIdSorter.graphTime=1, ConflictIdSorter.topsortTime=1, ConflictIdSorter.conflictIdCount=3, ConflictIdSorter.conflictIdCycleCount=0, ConflictResolver.totalTime=7, ConflictResolver.conflictItemCount=3, DefaultDependencyCollector.collectTime=77, DefaultDependencyCollector.transformTime=14}
[DEBUG] shade:shade:pom:1.0-SNAPSHOT
[DEBUG]    org.apache.commons:commons-lang3:jar:3.4:compile
[DEBUG]    junit:junit:jar:4.11:compile
[DEBUG]       org.hamcrest:hamcrest-core:jar:1.3:compile
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ shade ---
[DEBUG] Dependency collection stats: {ConflictMarker.analyzeTime=0, ConflictMarker.markTime=0, ConflictMarker.nodeCount=3, ConflictIdSorter.graphTime=0, ConflictIdSorter.topsortTime=0, ConflictIdSorter.conflictIdCount=3, ConflictIdSorter.conflictIdCycleCount=0, ConflictResolver.totalTime=0, ConflictResolver.conflictItemCount=3, DefaultDependencyCollector.collectTime=24, DefaultDependencyCollector.transformTime=0}
[DEBUG] org.apache.maven.plugins:maven-clean-plugin:jar:2.5:
[DEBUG]    org.apache.maven:maven-plugin-api:jar:2.0.6:compile
[DEBUG]    org.codehaus.plexus:plexus-utils:jar:3.0:compile
[DEBUG] Created new class realm plugin>org.apache.maven.plugins:maven-clean-plugin:2.5
[DEBUG] Importing foreign packages into class realm plugin>org.apache.maven.plugins:maven-clean-plugin:2.5
[DEBUG]   Imported:  < maven.api
[DEBUG] Populating class realm plugin>org.apache.maven.plugins:maven-clean-plugin:2.5
[DEBUG]   Included: org.apache.maven.plugins:maven-clean-plugin:jar:2.5
[DEBUG]   Included: org.codehaus.plexus:plexus-utils:jar:3.0
[DEBUG] Configuring mojo org.apache.maven.plugins:maven-clean-plugin:2.5:clean from plugin realm ClassRealm[plugin>org.apache.maven.plugins:maven-clean-plugin:2.5, parent: sun.misc.Launcher$AppClassLoader@45ee12a7]
[DEBUG] Configuring mojo 'org.apache.maven.plugins:maven-clean-plugin:2.5:clean' with basic configurator -->
[DEBUG]   (f) directory = /Users/tom/shade/target
[DEBUG]   (f) excludeDefaultDirectories = false
[DEBUG]   (f) failOnError = true
[DEBUG]   (f) followSymLinks = false
[DEBUG]   (f) outputDirectory = /Users/tom/shade/target/classes
[DEBUG]   (f) reportDirectory = /Users/tom/shade/target/site
[DEBUG]   (f) retryOnError = true
[DEBUG]   (f) skip = false
[DEBUG]   (f) testOutputDirectory = /Users/tom/shade/target/test-classes
[DEBUG] -- end configuration --
[DEBUG] Skipping non-existing directory /Users/tom/shade/target
[DEBUG] Skipping non-existing directory /Users/tom/shade/target/classes
[DEBUG] Skipping non-existing directory /Users/tom/shade/target/test-classes
[DEBUG] Skipping non-existing directory /Users/tom/shade/target/site
[INFO]
[INFO] --- maven-shade-plugin:2.4.3:shade (default) @ shade ---
[DEBUG] Dependency collection stats: {ConflictMarker.analyzeTime=1, ConflictMarker.markTime=0, ConflictMarker.nodeCount=91, ConflictIdSorter.graphTime=1, ConflictIdSorter.topsortTime=0, ConflictIdSorter.conflictIdCount=37, ConflictIdSorter.conflictIdCycleCount=0, ConflictResolver.totalTime=8, ConflictResolver.conflictItemCount=88, DefaultDependencyCollector.collectTime=269, DefaultDependencyCollector.transformTime=10}
[DEBUG] org.apache.maven.plugins:maven-shade-plugin:jar:2.4.3:
[DEBUG]    org.apache.maven:maven-plugin-api:jar:3.0:compile
[DEBUG]       org.sonatype.sisu:sisu-inject-plexus:jar:1.4.2:compile
[DEBUG]          org.sonatype.sisu:sisu-inject-bean:jar:1.4.2:compile
[DEBUG]             org.sonatype.sisu:sisu-guice:jar:noaop:2.1.7:compile
[DEBUG]    org.apache.maven:maven-model:jar:3.0:compile
[DEBUG]    org.apache.maven:maven-core:jar:3.0:compile
[DEBUG]       org.apache.maven:maven-settings:jar:3.0:compile
[DEBUG]       org.apache.maven:maven-settings-builder:jar:3.0:compile
[DEBUG]       org.apache.maven:maven-repository-metadata:jar:3.0:compile
[DEBUG]       org.apache.maven:maven-model-builder:jar:3.0:compile
[DEBUG]       org.apache.maven:maven-aether-provider:jar:3.0:runtime
[DEBUG]       org.sonatype.aether:aether-impl:jar:1.7:compile
[DEBUG]          org.sonatype.aether:aether-spi:jar:1.7:compile
[DEBUG]       org.sonatype.aether:aether-api:jar:1.7:compile
[DEBUG]       org.sonatype.aether:aether-util:jar:1.7:compile
[DEBUG]       org.codehaus.plexus:plexus-i

Answer 1

Tun*_*aki 5

这个问题肯定可以更清楚。这是因为你有一个pom打包的项目。

<packaging>pom</packaging>

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该插件正在寻找，jar但没有找到。如果您将该包装更改为jar那么它会按预期工作。

<packaging>jar</packaging>

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