[英]java build tool maven and jar file
我是JAVA的新手,想从网上运行一个示例程序。
我从github https://github.com/yiming187/curator-example下载了一个包
我用命令mvn package
编译它。 结果显示了BUILD SUCCESS。
[vagrant@bb720864d128 curator-example]$ mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building curator-example 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ curator-example ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /vagrant/curator-example/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ curator-example ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ curator-example ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /vagrant/curator-example/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ curator-example ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ curator-example --
-
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ curator-example ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.767s
[INFO] Finished at: Tue Oct 27 22:27:29 UTC 2015
[INFO] Final Memory: 8M/237M
[INFO] ------------------------------------------------------------------------
然后我去了一个目标文件,找到了curator-example-0.0.1-SNAPSHOT.jar。 我试着为它运行一个例子。 但它不起作用。
java -cp curator-example-0.0.1-SNAPSHOT.jar com / ctrip / zk / curator / example / DistributedIdQueueExample
输出:
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
CuratorFramework cannot be resolved to a type
DistributedIdQueue cannot be resolved to a type
CuratorFrameworkFactory cannot be resolved
ExponentialBackoffRetry cannot be resolved to a type
CuratorListener cannot be resolved to a type
CuratorFramework cannot be resolved to a type
CuratorEvent cannot be resolved to a type
QueueConsumer cannot be resolved to a type
The method createQueueConsumer() from the type DistributedIdQueueExample refers to the missing type QueueConsumer
QueueBuilder cannot be resolved to a type
QueueBuilder cannot be resolved
The method createQueueSerializer() from the type DistributedIdQueueExample refers to the missing type QueueSerializer
CloseableUtils cannot be resolved
CloseableUtils cannot be resolved
at com.ctrip.zk.curator.example.DistributedIdQueueExample.main(DistributedIdQueueExample.java:20)
的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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ctrip.zk</groupId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<artifactId>curator-example</artifactId>
<name>curator-example</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>2.7.1</version>
</dependency>
</dependencies>
</project>
你错过了策展人食谱JAR(又名依赖)。 通常,带有包装jar
的POM将生产适合包含在其他项目中的罐子,因此它不适合独立运行。
如果要从命令行运行它,则需要一个所谓的“jar-with-dependencies”,这是一个特殊的包装,其中所有依赖项(直接和传递)都包含在最终工件中。
在<build />
节点中添加:
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<!--
<archive>
<manifest>
<mainClass>package.and.name.of.main.class</mainClass>
</manifest>
</archive>
-->
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
请注意,我注释掉了<archive />
部分,可供参考。 如果你真的有一个主类,你可以在那里指定它,然后你可以用java -jar <jar-file>
运行你的项目,MANIFEST会告诉Java哪里是main()
方法。
策展人示例pom不包括策展人框架jar,这是非常奇怪的。 因为缺少的类不在curator-recipes jar中,所以它们在curator-framework jar中。 我想配方jar作为依赖项拉入框架jar。
尝试将依赖项更改为以下内容,然后重新编译:
<dependencies>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.7.1</version>
</dependency>
</dependencies>
然后运行我在评论中放入的最后一个java命令。
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