我正处于Maven的开始阶段。我创建了一个项目，并尝试使用该命令。我这边缺了什么？我正在尝试编译并运行一个TestSuite文件：
mvn clean package
POM.xml
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test.myProject</groupId>
<artifactId>myTest</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>egdsvTest</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
但使用后我得到了以下异常。
异常
D:MVN_Shirish_ProjectTest>mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethrea
ded.SingleThreadedBuilder with a thread count of 1
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Test 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ Test ---
[INFO] Deleting D:MVN_Shirish_ProjectTesttarget
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Test
---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources,
i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory D:MVN_Shirish_ProjectTestsrc
mainresources
[INFO]
[INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ Test ---
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. b
uild is platform dependent!
[INFO] Compiling 1 source file to D:MVN_Shirish_ProjectTesttargetclasse
s
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ eg
dsvTest ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources,
i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory D:MVN_Shirish_ProjectTestsrc
testresources
[INFO]
[INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @
Test ---
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. b
uild is platform dependent!
[INFO] Compiling 1 source file to D:MVN_Shirish_ProjectTesttargettest-c
lasses
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ Test ---
[INFO] Surefire report directory: D:MVN_Shirish_ProjectTesttargetsurefi
re-reports
[WARNING] Missing POM for org.apache.maven.surefire:surefire-junit3:jar:2.12.4
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.968 s
[INFO] Finished at: 2014-10-14T12:28:09+05:30
[INFO] Final Memory: 7M/247M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.
12.4:test (default-test) on project Test: Unable to generate classpath: org
.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException: Missing:
[ERROR] ----------
[ERROR] 1) org.apache.maven.surefire:surefire-junit3:jar:2.12.4
[ERROR]
[ERROR] Try downloading the file manually from the project website.
[ERROR]
[ERROR] Then, install it using the command:
[ERROR] mvn install:install-file -DgroupId=org.apache.maven.surefire -DartifactI
d=surefire-junit3 -Dversion=2.12.4 -Dpackaging=jar -Dfile=/path/to/file
[ERROR]
[ERROR] Alternatively, if you host your own repository you can deploy the file t
here:
[ERROR] mvn deploy:deploy-file -DgroupId=org.apache.maven.surefire -DartifactId=
surefire-junit3 -Dversion=2.12.4 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url
] -DrepositoryId=[id]
[ERROR]
[ERROR] Path to dependency:
[ERROR] 1) dummy:dummy:jar:1.0
[ERROR] 2) org.apache.maven.surefire:surefire-junit3:jar:2.12.4
[ERROR]
[ERROR] ----------
[ERROR] 1 required artifact is missing.
[ERROR]
[ERROR] for artifact:
[ERROR] dummy:dummy:jar:1.0
[ERROR]
[ERROR] from the specified remote repositories:
[ERROR] m1 (http://repo1.maven.org/maven2, releases=true, snapshots=false)
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionE
xception
Maven的工作原理是在桌面或安装了Maven的机器上创建一个本地存储库并运行此目标。
在maven运行目标的过程中，它首先尝试从Central repository中获取您在注释M1或M2中列出的所有依赖jar文件，然后将它们存储在C:\Users/yourname/.M2/repository文件夹（假设您使用的是windows机器）或其他操作系统中相应的用户文件夹下。
然后，它使用jar根据给定的目标运行所需的构建。
现在，在您的情况下，您必须找到连接到存储库的方法（检查位于User目录中.m2文件夹中的settings.xml），并检查您是否可以连接到internet中央maven存储库。如果没有，您可以获得jar文件，并按照错误中的建议手动安装它们。一旦你这样做了，我认为你应该克服这个问题。如果你还有问题，请告诉我。
在我的案例中，这是由于我正在进行离线构建（即mvn -o install），而我的本地Maven存储库中还没有安装那个jar。进行在线构建（mvn install）修复了它。