Maven ArtifactNotFoundException故障排除

Question

问题：--我正在尝试使Google缓冲区依赖项工作。但没有结果。Maven只是无法提取任何协议缓冲区依赖项。

Question1:Question1:据我所知，标准maven存储库中不存在这种依赖关系，因此我只需要指出一些额外的存储库。我说的对吗？

Question2:如果对第一个问题的回答是肯定的，那么我如何才能获得额外存储库的url呢？这里是对maven依赖项的引用。

错误：

[ERROR] Plugin com.google.protobuf.tools:maven-protoc-plugin:0.3.2 or one of its dependencies could not be resolved: Failure to find com.google.protobuf.to
ols:maven-protoc-plugin:jar:0.3.2 in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the u
pdate interval of central has elapsed or updates are forced -> [Help 1]
org.apache.maven.plugin.PluginResolutionException: Plugin com.google.protobuf.tools:maven-protoc-plugin:0.3.2 or one of its dependencies could not be resol
ved: Failure to find com.google.protobuf.tools:maven-protoc-plugin:jar:0.3.2 in http://repo.maven.apache.org/maven2 was cached in the local repository, res
olution will not be reattempted until the update interval of central has elapsed or updates are forced
       .......
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to find com.google.protobuf.tools:maven-protoc-plugin:jar:0.3.2 in http://rep
o.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or update
s are forced

pom.xml:

<?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>groupId</groupId>
    <artifactId>JavaSockets</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>2.5.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.google.protobuf.tools</groupId>
                <artifactId>maven-protoc-plugin</artifactId>
                <version>0.3.2</version>
                <configuration>
                    <protocExecutable>C:\Users\Clasik\Desktop\Java Sockets</protocExecutable>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>


        ......
Caused by: org.eclipse.aether.transfer.ArtifactNotFoundException: Failure to find com.google.protobuf.tools:maven-protoc-plugin:jar:0.3.2 in http://repo.ma
ven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates ar
e forced   
  ...............

Answer 1

缺少的依赖项是maven-plugin，而不是protobuf。这个插件是无法在Maven Central获得。

根据它的作者，您可以向pom.xml添加一个自托管存储库：

<pluginRepositories>
    <pluginRepository>
        <id>protoc-plugin</id>
        <url>http://sergei-ivanov.github.com/maven-protoc-plugin/repo/releases/</url>
    </pluginRepository>
</pluginRepositories>

但我在这里只得到404。因此，您可以与作者联系，或者查看源代码，并在本地存储库中手动安装插件。

Answer 2

解决方案是添加插件存储库：

<pluginRepositories>
    <pluginRepository>
        <id>dtrott</id>
        <url>http://maven.davidtrott.com/repository</url>
    </pluginRepository>
</pluginRepositories>

Answer 3

这个插件的旧版本可以从Bintray获得：

<pluginRepositories>
  <pluginRepository>
    <id>protoc-plugin</id>
    <url>https://dl.bintray.com/sergei-ivanov/maven</url>
  </pluginRepository>
</pluginRepositories>

我能够使用这个插件库获得0.3.2版本，这个插件库是在项目自述文件中链接到的