在Maven测试（lwjgl）中拾取本机JNI文件

Question

我正在使用LWJGL和Maven创建一个程序，并且正在为图形代码编写单元测试。我的问题是让Maven将本机二进制文件放在类路径上，以便测试可以选择它。我无法克服错误：

java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path

我已经将二进制文件解压缩到target / libs / native /，但是测试不会将它们打包。

这是我的pom：

 <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.ziroby.kata</groupId>
<artifactId>app</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <lwjgl.version>2.6</lwjgl.version>
</properties>

<repositories>
    <repository>## Heading ##
        <id>lwjgl</id>
        <name>lwjgl</name>
        <url>http://adterrasperaspera.com/lwjgl</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>org.hamcrest</groupId>
        <artifactId>hamcrest-library</artifactId>
        <version>1.2.1</version>
        <type>jar</type>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.jmock</groupId>
        <artifactId>jmock-junit4</artifactId>
        <version>2.5.1</version>
        <type>jar</type>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.2</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.lwjgl</groupId>
        <artifactId>lwjgl</artifactId>
        <version>${lwjgl.version}</version>
    </dependency>
    <dependency>
        <groupId>org.lwjgl</groupId>
        <artifactId>lwjgl-util</artifactId>
        <version>${lwjgl.version}</version>
    </dependency>
    <dependency>
        <groupId>org.lwjgl</groupId>
        <artifactId>lwjgl-native</artifactId>
        <version>2.6</version>
        <type>pom</type>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <configuration>
                <artifactItems>
                    <artifactItem>
                        <groupId>org.lwjgl</groupId>
                        <artifactId>lwjgl-native</artifactId>
                        <version>${lwjgl.version}</version>
                        <type>jar</type>
                        <outputDirectory>${project.build.directory}/libs/natives</outputDirectory>
                        <overWrite>true</overWrite>
                    </artifactItem>
                </artifactItems>
            </configuration>
            <executions>
                <execution>
                    <id>unpack</id>
                    <phase>generate-resources</phase>
                    <goals>
                        <goal>unpack</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
    </plugins>
</build>
</project>

我已经尝试过Maven-在执行测试时将目录添加到classpath，但这似乎是在谈论资源，而不是JNI库（并且它不起作用）。

而为maven指定类路径则是相反的问题：指定类路径中已经存在的内容。

Answer 1

根据http://maven.40175.n5.nabble.com/Trouble-with-Java-Native-Libraries-
td114063.html
，

surefire插件会启动VM，然后在将控制权传递给junit测试类之前修改系统属性。对于VM来说为时已晚，在初始化VM时需要设置java.library.path。

因此，我们需要在启动时提供通往Surefire的途径。以下工作：

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <configuration>
                <forkMode>once</forkMode>
                <argLine>-Djava.library.path=${project.build.directory}/libs/natives/win32:${project.build.directory}/libs/natives/linux:${project.build.directory}/libs/natives/macosx:${project.build.directory}/libs/natives/solaris</argLine>
            </configuration>
        </plugin>