从Artifactory下载文件的Java代码无法正常工作

Question

我的项目有以下结构。

$tree
.
├── [4.0K]  src/
│   └── [4.0K]  main/
│       └── [4.0K]  java/
│           └── [4.0K]  org/
│               └── [4.0K]  jfrog/
│                   └── [4.0K]  example/
│                       └── [6.2K]  ClientExample.java
├── [1.3K]  pom.xml
└── [ 781]  README.md

这是来自的示例程序

JFrog artifactory java client maven example

如果我做mvn compile我得到以下输出。

[INFO] Scanning for projects...
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Building maven-example 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven-example ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/karthik/Workspace/project-examples/artifactory-client-java-examples/maven-example/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.3:compile (default-compile) @ maven-example ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 1 source file to /home/karthik/Workspace/project-examples/artifactory-client-java-examples/maven-example/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.592 s
[INFO] Finished at: 2018-09-13T12:03:07+12:00
[INFO] Final Memory: 18M/135M
[INFO] ------------------------------------------------------------------------

其次是mvn package

INFO] Scanning for projects...
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Building maven-example 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven-example ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/karthik/Workspace/project-examples/artifactory-client-java-examples/maven-example/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.3:compile (default-compile) @ maven-example ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ maven-example ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/karthik/Workspace/project-examples/artifactory-client-java-examples/maven-example/src/test/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.3:testCompile (default-testCompile) @ maven-example ---
[INFO] No sources to compile
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ maven-example ---
[INFO] No tests to run.
[INFO] 
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ maven-example ---
[INFO] Building jar: /home/karthik/Workspace/project-examples/artifactory-client-java-examples/maven-example/target/maven-example-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.751 s
[INFO] Finished at: 2018-09-13T12:04:30+12:00
[INFO] Final Memory: 12M/135M
[INFO] ------------------------------------------------------------------------

如果我尝试运行生成的jar文件。

java -jar target/maven-example-1.0-SNAPSHOT.jar

我收到以下错误。

no main manifest attribute, in target/maven-example-1.0-SNAPSHOT.jar

由于这是来自JFrog github repository，我希望它能起作用。我究竟做错了什么？

将项目导入IntelliJ IDE构建并尝试运行会产生以下结果。构建看起来成功（jar file gets generated inside target folder）

但是，当我按下运行时，我会转到下一页。

Answer 1

pom.xml不包含构建可运行jar文件的说明。 （并且README没有提到你可以这样运行它）

运行它的最简单方法是将项目导入支持maven项目的IDE（Eclipse，IntelliJ等），然后从那里运行主类。