类未找到Maven Jar的例外
问题描述:
我使用maven来管理项目中的依赖项。这是我的pom.xml 的pom.xml类未找到Maven Jar的例外
<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.prasanna</groupId>
<artifactId>fft-java</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>fft-java</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
<dependency>
<groupId>com.github.wendykierp</groupId>
<artifactId>JTransforms</artifactId>
<version>3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.prasanna.TestFFT</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
我只有一个Java类在我的应用程序。当我从我的应用程序运行我的课程时,它按预期运行。而如果我做一个mvn package
并尝试从终端作为java -jar test-fft.jar
运行它,我得到一个java.lang.ClassNotFoundException: org.jtransforms.fft.DoubleFFT_2D
但这DoubleFFT_2D是JTransforms依赖的一部分,我已经加入。我将如何运行这个罐子?
答
使用maven-assembly插件构建具有依赖关系的jar。
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
答
<build>
\t <plugins>
\t <plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>Mydir/lib</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<outputDirectory>MyDir</outputDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib</classpathPrefix>
<mainClass>com.test.entryClassOfJarHavingMainMethod</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
\t </plugins>
\t
\t
</build>
在pom.xml中使用这些配置来创建lib文件夹和jar包作为一个jar
你需要你的依赖复制到lib文件夹。在maven配置中,你向我们展示了我没有看到这个目标。 – SimY4 2014-09-24 10:52:11