我在项目中使用Google的协议缓冲区。我们使用Maven自动编译protobufs（基于http://vlkan.com/blog/post/2015/11/27/maven-protobuf/）
Maven给了我们树错误，我们可以通过在Eclipse安装上安装Maven插件来解决这些问题。但是有一个我们无法解决的错误：
org.apache.maven.plugins:maven-dependency-plugin:2.9:copy:copy-protoc:generate-sources
这个错误显然是“随机”出现并且不会破坏编译：一切都很好。 以下是负责此问题的maven插件配置：
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.9</version>
<executions>
ERROR HERE - <execution>
<id>copy-protoc</id>
<phase>generate-sources</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>com.google.protobuf</groupId>
<artifactId>protoc</artifactId>
<version>3.0.0-beta-3</version>
<classifier>${os.detected.classifier}</classifier>
<type>exe</type>
<outputDirectory>${project.build.directory}</outputDirectory>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
我尝试删除.m2文件夹或查找更多插件无济于事。
如何从Eclipse中删除该错误？感谢
编辑1，整个堆栈跟踪：
Unable to find artifact. (org.apache.maven.plugins:maven-dependency-plugin:2.9:copy:copy-protoc:generate-sources)
org.apache.maven.plugin.MojoExecutionException: Unable to find artifact.
at org.apache.maven.plugin.dependency.fromConfiguration.AbstractFromConfigurationMojo.getArtifact(AbstractFromConfigurationMojo.java:265)
at org.apache.maven.plugin.dependency.fromConfiguration.AbstractFromConfigurationMojo.getProcessedArtifactItems(AbstractFromConfigurationMojo.java:171)
at org.apache.maven.plugin.dependency.fromConfiguration.CopyMojo.doExecute(CopyMojo.java:105)
at org.apache.maven.plugin.dependency.AbstractDependencyMojo.execute(AbstractDependencyMojo.java:167)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:331)
at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1362)
at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1360)
at org.eclipse.m2e.core.project.configurator.MojoExecutionBuildParticipant.build(MojoExecutionBuildParticipant.java:52)
at com.ianbrandt.tools.m2e.mdp.core.MdpBuildParticipant.executeMojo(MdpBuildParticipant.java:133)
at com.ianbrandt.tools.m2e.mdp.core.MdpBuildParticipant.build(MdpBuildParticipant.java:67)
at org.eclipse.m2e.core.internal.builder.MavenBuilderImpl.build(MavenBuilderImpl.java:137)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:172)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:1)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1$1.call(MavenBuilder.java:115)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1.call(MavenBuilder.java:105)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.execute(MavenBuilder.java:86)
at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:200)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:734)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:205)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:245)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:300)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:303)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:359)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:382)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:235)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: org.apache.maven.artifact.resolver.ArtifactNotFoundException: Failure to find com.google.protobuf:protoc:exe:3.0.0-beta-3 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
Try downloading the file manually from the project website.
Then, install it using the command:
mvn install:install-file -DgroupId=com.google.protobuf -DartifactId=protoc -Dversion=3.0.0-beta-3 -Dpackaging=exe -Dfile=/path/to/file
Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=com.google.protobuf -DartifactId=protoc -Dversion=3.0.0-beta-3 -Dpackaging=exe -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
com.google.protobuf:protoc:exe:3.0.0-beta-3
from the specified remote repositories:
central (https://repo.maven.apache.org/maven2, releases=true, snapshots=false)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:218)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:154)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:545)
at org.apache.maven.plugin.dependency.fromConfiguration.AbstractFromConfigurationMojo.getArtifact(AbstractFromConfigurationMojo.java:257)
... 37 more
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to find com.google.protobuf:protoc:exe:3.0.0-beta-3 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:444)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:246)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:223)
at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:294)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:212)
... 40 more
Caused by: org.eclipse.aether.transfer.ArtifactNotFoundException: Failure to find com.google.protobuf:protoc:exe:3.0.0-beta-3 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced
at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.newException(DefaultUpdateCheckManager.java:231)
at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.checkArtifact(DefaultUpdateCheckManager.java:206)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.gatherDownloads(DefaultArtifactResolver.java:585)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:503)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:421)
... 44 more
编辑2，有效POM：
Effective POMs, after inheritance, interpolation, and profiles are applied:
<!-- ====================================================================== -->
<!-- -->
<!-- Generated by Maven Help Plugin on 2016-06-01T01:19:06 -->
<!-- See: http://maven.apache.org/plugins/maven-help-plugin/ -->
<!-- -->
<!-- ====================================================================== -->
<!-- ====================================================================== -->
<!-- -->
<!-- Effective POM for project 'com.GroupName:ProjectName:jar:1.0-SNAPSHOT' -->
<!-- -->
<!-- ====================================================================== -->
<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>com.GroupName</groupId>
<artifactId>ProjectName</artifactId>
<version>1.0-SNAPSHOT</version>
<name>ProjectName</name>
<url>http://maven.apache.org</url>
<properties>
<build-helper-maven-plugin.version>1.9.1</build-helper-maven-plugin.version>
<java.version>1.8</java.version>
<junit.version>4.12</junit.version>
<maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
<maven-dependency-plugin.version>2.9</maven-dependency-plugin.version>
<maven-shade-plugin.version>2.4.3</maven-shade-plugin.version>
<os-maven-plugin.version>1.5.0.Final</os-maven-plugin.version>
<os.detected.arch>x86_64</os.detected.arch>
<os.detected.classifier>windows-x86_64</os.detected.classifier>
<os.detected.name>windows</os.detected.name>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<protobuf-java-format.version>1.2</protobuf-java-format.version>
<protobuf.input.directory>E:\Development\GroupName\ProjectFolder/proto</protobuf.input.directory>
<protobuf.output.directory.cpp>E:\Development\GroupName\ProjectFolder\target/libcpp</protobuf.output.directory.cpp>
<protobuf.output.directory.java>E:\Development\GroupName\ProjectFolder\target/generated-sources</protobuf.output.directory.java>
<protobuf.version>3.0.0-beta-3</protobuf.version>
</properties>
<dependencies>
<dependency>
<groupId>com.google.protobuf</groupId>
<artifactId>protobuf-java</artifactId>
<version>3.0.0-beta-3</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.googlecode.protobuf-java-format</groupId>
<artifactId>protobuf-java-format</artifactId>
<version>1.2</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
<repositories>
<repository>
<snapshots>
<enabled>false</enabled>
</snapshots>
<id>central</id>
<name>Central Repository</name>
<url>https://repo.maven.apache.org/maven2</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<releases>
<updatePolicy>never</updatePolicy>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
<id>central</id>
<name>Central Repository</name>
<url>https://repo.maven.apache.org/maven2</url>
</pluginRepository>
</pluginRepositories>
<build>
<sourceDirectory>E:\Development\GroupName\ProjectFolder\src\main\java</sourceDirectory>
<scriptSourceDirectory>E:\Development\GroupName\ProjectFolder\src\main\scripts</scriptSourceDirectory>
<testSourceDirectory>E:\Development\GroupName\ProjectFolder\src\test\java</testSourceDirectory>
<outputDirectory>E:\Development\GroupName\ProjectFolder\target\classes</outputDirectory>
<testOutputDirectory>E:\Development\GroupName\ProjectFolder\target\test-classes</testOutputDirectory>
<extensions>
<extension>
<groupId>kr.motd.maven</groupId>
<artifactId>os-maven-plugin</artifactId>
<version>1.5.0.Final</version>
</extension>
</extensions>
<resources>
<resource>
<directory>E:\Development\GroupName\ProjectFolder\src\main\resources</directory>
</resource>
</resources>
<testResources>
<testResource>
<directory>E:\Development\GroupName\ProjectFolder\src\test\resources</directory>
</testResource>
</testResources>
<directory>E:\Development\GroupName\ProjectFolder\target</directory>
<finalName>ProjectName</finalName>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.3</version>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2-beta-5</version>
</plugin>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.8</version>
</plugin>
<plugin>
<artifactId>maven-release-plugin</artifactId>
<version>2.3.2</version>
</plugin>
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<versionRange>[1.7,)</versionRange>
<goals>
<goal>run</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore />
<execute>
<runOnConfiguration>true</runOnConfiguration>
<runOnIncremental>true</runOnIncremental>
</execute>
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<executions>
<execution>
<id>default-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</execution>
<execution>
<id>default-testCompile</id>
<phase>test-compile</phase>
<goals>
<goal>testCompile</goal>
</goals>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</execution>
</executions>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.7</version>
<executions>
<execution>
<id>default-testResources</id>
<phase>process-test-resources</phase>
<goals>
<goal>testResources</goal>
</goals>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</execution>
<execution>
<id>default-resources</id>
<phase>process-resources</phase>
<goals>
<goal>resources</goal>
</goals>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</execution>
</executions>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.9</version>
<executions>
<execution>
<id>copy-protoc</id>
<phase>generate-sources</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>com.google.protobuf</groupId>
<artifactId>protoc</artifactId>
<version>3.0.0-beta-3</version>
<classifier>${os.detected.classifier}</classifier>
<type>exe</type>
<outputDirectory>E:\Development\GroupName\ProjectFolder\target</outputDirectory>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.8</version>
<executions>
<execution>
<id>exec-protoc</id>
<phase>generate-sources</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<target>
<property name="protoc.filename" value="protoc-3.0.0-beta-3-${os.detected.classifier}.exe" />
<property name="protoc.filepath" value="E:\Development\GroupName\ProjectFolder\target/${protoc.filename}" />
<chmod file="${protoc.filepath}" perm="ugo+rx" />
<mkdir dir="E:\Development\GroupName\ProjectFolder\target/generated-sources" />
<mkdir dir="E:\Development\GroupName\ProjectFolder\target/libcpp" />
<path id="protobuf.input.filepaths.path">
<fileset dir="E:\Development\GroupName\ProjectFolder/proto">
<include name="**/*.proto" />
</fileset>
</path>
<pathconvert property="protobuf.input.filepaths" pathsep=" " refid="protobuf.input.filepaths.path" />
<exec failonerror="true" executable="${protoc.filepath}">
<arg value="-I" />
<arg value="E:\Development\GroupName\ProjectFolder/proto" />
<arg value="--java_out" />
<arg value="E:\Development\GroupName\ProjectFolder\target/generated-sources" />
<arg value="--cpp_out" />
<arg value="E:\Development\GroupName\ProjectFolder\target/libcpp" />
<arg line="${protobuf.input.filepaths}" />
</exec>
</target>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.9.1</version>
<executions>
<execution>
<id>add-classes</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>E:\Development\GroupName\ProjectFolder\target/generated-sources</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<id>default-clean</id>
<phase>clean</phase>
<goals>
<goal>clean</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<id>default-jar</id>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.12.4</version>
<executions>
<execution>
<id>default-test</id>
<phase>test</phase>
<goals>
<goal>test</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<id>default-install</id>
<phase>install</phase>
<goals>
<goal>install</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.7</version>
<executions>
<execution>
<id>default-deploy</id>
<phase>deploy</phase>
<goals>
<goal>deploy</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.3</version>
<executions>
<execution>
<id>default-site</id>
<phase>site</phase>
<goals>
<goal>site</goal>
</goals>
<configuration>
<outputDirectory>E:\Development\GroupName\ProjectFolder\target\site</outputDirectory>
<reportPlugins>
<reportPlugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
</reportPlugin>
</reportPlugins>
</configuration>
</execution>
<execution>
<id>default-deploy</id>
<phase>site-deploy</phase>
<goals>
<goal>deploy</goal>
</goals>
<configuration>
<outputDirectory>E:\Development\GroupName\ProjectFolder\target\site</outputDirectory>
<reportPlugins>
<reportPlugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
</reportPlugin>
</reportPlugins>
</configuration>
</execution>
</executions>
<configuration>
<outputDirectory>E:\Development\GroupName\ProjectFolder\target\site</outputDirectory>
<reportPlugins>
<reportPlugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
</reportPlugin>
</reportPlugins>
</configuration>
</plugin>
</plugins>
</build>
<reporting>
<outputDirectory>E:\Development\GroupName\ProjectFolder\target\site</outputDirectory>
</reporting>
</project>
答案 0 :(得分：1)
感谢您发布此问题。我在我的pom中遇到了类似的问题。 一旦我将maven依赖插件版本更改为3.0.0
，它就得到了解决我不确定的另一件事是maven-dependency插件检测到的分类器，所以我手动给它。我看到你也手动定义了它，所以更新依赖插件本身就可以解决这个问题。