我设置了一个多模块Maven项目，该项目由一个旨在构建nar jni库的模块和一个依赖于该库的jar打包模块组成。
我可以将nar库安装到本地maven存储库中，但是无法在从属模块中使用它。
例如，我运行mvn nar:nar-unpack，我得到:
[INFO] ------------------------------------------------------------------------
[INFO] Building nar-dependent 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- nar-maven-plugin:3.2.0:nar-unpack (default-cli) @ nar-dependent ---
[INFO] Unpacking 0 dependencies to /home/przemek/Documents/stimulant/nar-dependent/target/nar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
似乎没有nar依赖性，这显然是不正确的。
此外，尝试执行利用jni库的类的main方法失败:
mvn exec:java -Dexec.mainClass=App
[INFO] --- exec-maven-plugin:1.4.0:java (default-cli) @ nar-dependent ---
[WARNING]
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.UnsatisfiedLinkError: no nar-library-1.0-SNAPSHOT in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1865)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1122)
at jnibook.NarSystem.loadLibrary(NarSystem.java:23)
at jnibook.HelloWorld.<clinit>(HelloWorld.java:10)
at App.main(App.java:9)
... 6 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
该项目的结构如下所示:
.
├── nar-dependent
│ ├── pom.xml
│ └── src
│ └── main
│ └── java
│ └── App.java
├── nar-library
│ ├── pom.xml
│ └── src
│ ├── main
│ │ ├── c
│ │ │ └── HelloWorld.c
│ │ ├── include
│ │ ├── java
│ │ │ └── jnibook
│ │ │ └── HelloWorld.java
│ │ └── resources
│ └── test
│ └── java
├── parent
│ └── pom.xml
这是父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>sidec</groupId>
<artifactId>stimulant</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>../nar-library</module>
<module>../nar-dependent</module>
</modules>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
nar-library模块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>
<parent>
<groupId>sidec</groupId>
<artifactId>stimulant</artifactId>
<version>1.0-SNAPSHOT</version>
<relativePath>../parent/pom.xml</relativePath>
</parent>
<artifactId>nar-library</artifactId>
<packaging>nar</packaging>
<name>nar-library</name>
<properties>
<skipTests>true</skipTests>
</properties>
<build>
<plugins>
<plugin>
<groupId>com.github.maven-nar</groupId>
<artifactId>nar-maven-plugin</artifactId>
<version>3.2.0</version>
<extensions>true</extensions>
<configuration>
<cpp>
<exceptions>false</exceptions>
</cpp>
<libraries>
<library>
<type>jni</type>
<linkCPP>false</linkCPP>
<narSystemPackage>jnibook</narSystemPackage>
</library>
</libraries>
<javah>
<includes>
<include></include>
</includes>
</javah>
</configuration>
</plugin>
</plugins>
</build>
</project>
依赖于nar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>
<parent>
<groupId>sidec</groupId>
<artifactId>stimulant</artifactId>
<version>1.0-SNAPSHOT</version>
<relativePath>../parent/pom.xml</relativePath>
</parent>
<artifactId>nar-dependent</artifactId>
<packaging>jar</packaging>
<name>nar-dependent</name>
<build>
<plugins>
<plugin>
<groupId>com.github.maven-nar</groupId>
<artifactId>nar-maven-plugin</artifactId>
<version>3.2.0</version>
<extensions>true</extensions>
<!--<executions>-->
<!--<execution>-->
<!--<id>nar-download</id>-->
<!--<goals>-->
<!--<goal>nar-download</goal>-->
<!--</goals>-->
<!--</execution>-->
<!--</executions>-->
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>sidec</groupId>
<artifactId>nar-library</artifactId>
<version>1.0-SNAPSHOT</version>
<type>nar</type>
</dependency>
</dependencies>
</project>
最后，为了证明它确实是HelloWorld项目，使用了一个库类:
package jnibook;
public class HelloWorld {
public native void print();
static {
NarSystem.loadLibrary();
}
}
和一个客户端应用程序:
import jnibook.HelloWorld;
public class App {
public static void main(String ... args){
(new HelloWorld()).print();
}
}
我引用https://maven-nar.github.io/examples.html没有成功。
我不知道出了什么问题。
有任何想法吗？ Here is zip with project。
最佳答案
这可能是一个过时的问题，但我将回答所有相同的问题:
运行Java JNI应用程序时，必须告知在哪里可以找到保存有JNI使用的相关 native C代码的.so库。
例如，如果您关闭了可执行文件jar app.jar中的应用程序:java -Djava.library.path=[path to the .so native C library] -jar app.jar
PS-您可以看到JVM由于以下异常而找不到 native C库:java.lang.UnsatisfiedLinkError: no nar-library-1.0-SNAPSHOT in java.library.path
关于maven - 多模块Maven项目中的Nar依赖关系，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/31920398/