java - 如何毫不费力地分发matrix-toolkits-java(MTJ)？

Question

我想使用MTJ库。但是为什么我会收到ClassNotFoundException？如何实现正确的构建和编码方式？

首先是错误消息，然后是代码示例:

错误(gradle build; java -jar build / libs / tmp.jar):

Exception in thread "main" java.lang.NoClassDefFoundError: no/uib /cipr/matrix/DenseMatrix
    at de.piphi.Main.readMatrix(Main.java:7)
    at de.piphi.Main.main(Main.java:12)
Caused by: java.lang.ClassNotFoundException: no.uib.cipr.matrix.DenseMatrix
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

gradle.build:

apply plugin: 'java'
repositories{
    jcenter()
    mavenCentral()
}

dependencies {
    compile group: 'com.googlecode.matrix-toolkits-java', name:    'mtj', version: '1.0.2'
}

jar {
    manifest {
        attributes 'Main-Class': 'de.piphi.Main'
    }
}

src / main / java / de / piphi / Main.cpp:

package de.piphi;

import no.uib.cipr.matrix.*;

public class Main {
    static void readMatrix(){
        Matrix m = new DenseMatrix(2,2);
        System.out.println(m);
    }

    public static void main(String[] args) {
        readMatrix();
    }
}

我知道 Is there any example how to use Matrix Toolkit Java (MTJ)?，但是 the wiki page mentioned不再存在。

Answer 1

我必须将插件应用程序添加到build.gradle。在Main.cpp中，import no.uib.cipr.matrix.*;的导入必须为

import no.uib.cipr.matrix.DenseMatrix;

我更改了'矩阵m =新的DenseMatrix(2,2);'至

DenseMatrix m = new DenseMatrix(2,2);