Maven 下载 jar 但随后报告 "Could not resolve dependencies"

Question

我将 pom.xml 中的版本依赖更新为：

    <dependency>
        <groupId>com.twelvemonkeys.imageio</groupId>
        <artifactId>imageio</artifactId>
        <version>3.2.1</version>
    </dependency>
    <dependency>
        <groupId>com.twelvemonkeys.imageio</groupId>
        <artifactId>imageio-jpeg</artifactId>
        <version>3.2.1</version>
    </dependency>

当运行

     mvn package

我们看到正在下载新版本：

[INFO] ------------------------------------------------------------------------
Downloading: https://repository.apache.org/content/repositories/snapshots/com/twelvemonkeys/imageio/imageio-jpeg/3.2.1/imageio-jpeg-3.2.1.pom
Downloading: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-jpeg/3.2.1/imageio-jpeg-3.2.1.pom
Downloaded: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-jpeg/3.2.1/imageio-jpeg-3.2.1.pom (2 KB at 8.0 KB/sec)
Downloading: https://repository.apache.org/content/repositories/snapshots/com/twelvemonkeys/imageio/imageio-core/3.2.1/imageio-core-3.2.1.pom
Downloading: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-core/3.2.1/imageio-core-3.2.1.pom
Downloaded: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-core/3.2.1/imageio-core-3.2.1.pom (1004 B at 22.3 KB/sec)
Downloading: https://repository.apache.org/content/repositories/snapshots/com/twelvemonkeys/imageio/imageio-metadata/3.2.1/imageio-metadata-3.2.1.pom
Downloading: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-metadata/3.2.1/imageio-metadata-3.2.1.pom
Downloaded: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-metadata/3.2.1/imageio-metadata-3.2.1.pom (974 B at 20.7 KB/sec)
Downloading: https://repository.apache.org/content/repositories/snapshots/com/twelvemonkeys/imageio/imageio-jpeg/3.2.1/imageio-jpeg-3.2.1.jar
Downloading: https://repository.apache.org/content/repositories/snapshots/com/twelvemonkeys/imageio/imageio-core/3.2.1/imageio-core-3.2.1.jar
Downloading: https://repository.apache.org/content/repositories/snapshots/com/twelvemonkeys/imageio/imageio-metadata/3.2.1/imageio-metadata-3.2.1.jar
Downloading: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-jpeg/3.2.1/imageio-jpeg-3.2.1.jar
Downloading: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-core/3.2.1/imageio-core-3.2.1.jar
Downloading: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-metadata/3.2.1/imageio-metadata-3.2.1.jar
Downloaded: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-jpeg/3.2.1/imageio-jpeg-3.2.1.jar (58 KB at 145.8 KB/sec)
Downloaded: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-core/3.2.1/imageio-core-3.2.1.jar (64 KB at 152.0 KB/sec)
Downloaded: https://repo.maven.apache.org/maven2/com/twelvemonkeys/imageio/imageio-metadata/3.2.1/imageio-metadata-3.2.1.jar (72 KB at 171.7 KB/sec)

但是 package 目标仍然失败.. 当无法解决其中一个相同的依赖项时 (imageio.jar:3.2.1) ?

[INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.911 s [INFO] Finished at: 2016-06-21T13:21:39-07:00 [INFO] Final Memory: 17M/221M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal on project sparknet: Could not resolve dependencies for project org.amplab:sparknet:jar:1.0: Failure to find com.twelvemonkeys.imageio:imageio:jar:3.2.1 in https://repository.apache.org/content/repositories/snapshots was cached in the local repository, resolution will not be reattempted until the update interval of Maven snapshots repository has elapsed or updates are forced -> [Help 1] [ERROR]

Answer 1

您需要使用 -U 来强制 Maven 忽略本地存储库中的缓存工件并更新它们。 mvn package -U

Answer 2

看来问题是 3.1.2 和 3.2.1 版本的 imagio 他们重组了模块。现在他们有 imageio-core 而不是 imageio。

所以..更新 pom.xml 如下：

<dependency> <groupId>com.twelvemonkeys.imageio</groupId> <artifactId>imageio-core</artifactId> <version>3.2.1</version> </dependency>

（使用 imageio-core 而不是 imageio）似乎已经解决了。

Maven 下载 jar 但随后报告 "Could not resolve dependencies"

Maven downloads jars but then reports "Could not resolve dependencies"

maven

build-dependencies