[英]Why maven cannot add my dependency to jar?
我是 maven 的新手,我想做的一件簡單的事情是拉 maven 存儲庫並在我的項目中使用它。 但這已經發生了。
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>ToolsQA</groupId>
<artifactId>jutil_table</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>jutil_table</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.github.chrisgleissner</groupId>
<artifactId>jutil-protobuf</artifactId>
<version>1.1.11</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
App.java
package ToolsQA;
/**
* Hello world!
*
*/
import static com.github.chrisgleissner.jutil.table.TablePrinter.DefaultTablePrinter;
import static java.util.Arrays.asList;
public class App
{
public static void main( String[] args )
{
System.out.println( "Hello World!" );
Iterable<String> HEADERS = asList("id", "name", "age");
DefaultTablePrinter.print(HEADERS, null);
}
}
完成錯誤信息
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------< ToolsQA:jutil_table >-------------------------
[INFO] Building jutil_table 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ jutil_table ---
[INFO] Deleting C:\Users\Pawar\Desktop\mvn_tutorial\jutil_table\jutil_table\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ jutil_table ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\Pawar\Desktop\mvn_tutorial\jutil_table\jutil_table\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.5.1:compile (default-compile) @ jutil_table ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 1 source file to C:\Users\Pawar\Desktop\mvn_tutorial\jutil_table\jutil_table\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /C:/Users/Pawar/Desktop/mvn_tutorial/jutil_table/jutil_table/src/main/java/ToolsQA/App.java:[8,53] package com.github.chrisgleissner.jutil.table does not exist
[ERROR] /C:/Users/Pawar/Desktop/mvn_tutorial/jutil_table/jutil_table/src/main/java/ToolsQA/App.java:[8,2] static import only from classes and interfaces
[ERROR] /C:/Users/Pawar/Desktop/mvn_tutorial/jutil_table/jutil_table/src/main/java/ToolsQA/App.java:[18,10] cannot find symbol
symbol: variable DefaultTablePrinter
location: class ToolsQA.App
[INFO] 3 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.037 s
[INFO] Finished at: 2020-05-24T22:49:15+05:30
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile) on project jutil_table: Compilation failure: Compilation failure:
[ERROR] /C:/Users/Pawar/Desktop/mvn_tutorial/jutil_table/jutil_table/src/main/java/ToolsQA/App.java:[8,53] package com.github.chrisgleissner.jutil.table does not exist
[ERROR] /C:/Users/Pawar/Desktop/mvn_tutorial/jutil_table/jutil_table/src/main/java/ToolsQA/App.java:[8,2] static import only from classes and interfaces
[ERROR] /C:/Users/Pawar/Desktop/mvn_tutorial/jutil_table/jutil_table/src/main/java/ToolsQA/App.java:[18,10] cannot find symbol
[ERROR] symbol: variable DefaultTablePrinter
[ERROR] location: class ToolsQA.App
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[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 read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
我閱讀了很多關於 stackoverflow 的文章和很多相關問題。 但 maven 仍然無法下載 repo。 並且構建失敗。 我使用 mvn compile、mvn package、mvn clean install 對我沒有任何作用。 請幫忙✌️
根據 文檔,您需要擁有所有三個依賴項。 您發布的那個問題與 maven 沒有直接關系。 這表示編譯器找不到符號,可能是因為 class 不在類路徑中。 嘗試包含所有依賴項。
或者在這種情況下,您真正需要的只是jutil-table
的依賴項。 您可以省略其他兩個。 但是您的 maven pom 包含jutil-protobuf
依賴項。
<dependency>
<groupId>com.github.chrisgleissner</groupId>
<artifactId>jutil-protobuf</artifactId>
<version>1.1.11</version>
</dependency>
<dependency>
<groupId>com.github.chrisgleissner</groupId>
<artifactId>jutil-sql-log</artifactId>
<version>1.1.11</version>
</dependency>
<dependency>
<groupId>com.github.chrisgleissner</groupId>
<artifactId>jutil-table</artifactId>
<version>1.1.11</version>
</dependency>
並使用 maven 程序集插件構建 jar 包括依賴項
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<archive>
<manifest>
<mainClass> // Main class Ex : com.Test </mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
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