maven问题ArtifactDescriptorException

Question

我正在尝试Spring REST示例，解释为here。该项目的源代码在这里here。

我解压了这个文件，将top文件夹重命名为'myproject‘，并将其作为一个现有的maven项目导入到eclipse中。但是，观察到由于缺少spring jars而导致的许多编译问题。我猜这是因为maven不能导入这些jars。当我检查pom.xml时，我看到eclipse正在抱怨以下错误：

ArtifactDescriptorException: Failed to read artifact descriptor for com.fasterxml.jackson.core:jackson-databind:jar:2.2.2: ArtifactResolutionException: Failure to transfer com.fasterxml.jackson.core:jackson-databind:pom:2.2.2 from http://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. Original error: Could not transfer artifact com.fasterxml.jackson.core:jackson-databind:pom:2.2.2 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/com/fasterxml/jackson/core/jackson-databind/2.2.2/jackson-databind-2.2.2.pom

和

ArtifactDescriptorException: Failed to read artifact descriptor for com.fasterxml.jackson.core:jackson-databind:jar:2.2.2: ArtifactResolutionException: Failure to transfer com.fasterxml.jackson.core:jackson-databind:pom:2.2.2 from http://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. Original error: Could not transfer artifact com.fasterxml.jackson.core:jackson-databind:pom:2.2.2 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/com/fasterxml/jackson/core/jackson-databind/2.2.2/jackson-databind-2.2.2.pom

我刚开始接触maven，所以在这里很艰难。请告诉我怎么修。

谢谢。

Answer 1

对我来说，这是因为Eclipse缓存了异常。尝试：

右击项目-> maven -> update -项目->强制更新快照/发布-> OK。

它对我来说也适用于同样的问题。

Answer 2

试试这个对我有帮助

右击项目-> maven -> update -项目->强制更新快照/发布-> OK。

Answer 3

您是否可以尝试使用依赖关系，如：

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.2.3</version>

​

并尝试使用-U标志运行您的Maven应用程序。