多模块maven项目中的Nar依赖
我建立了一个多模块maven项目,它由一个注定要构建nar jni库的模块和一个依赖于该库的jar打包模块组成 我能够将nar库安装到本地maven存储库中,但在依赖模块中无法使用它 例如,我运行多模块maven项目中的Nar依赖,maven,java-native-interface,maven-nar-plugin,Maven,Java Native Interface,Maven Nar Plugin,我建立了一个多模块maven项目,它由一个注定要构建nar jni库的模块和一个依赖于该库的jar打包模块组成 我能够将nar库安装到本地maven存储库中,但在依赖模块中无法使用它 例如,我运行mvn nar:nar unpack,得到: [INFO] ------------------------------------------------------------------------ [INFO] Building nar-dependent 1.0-SNAPSHOT [INFO]
mvn nar:nar unpack
,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依赖关系,这显然是不正确的。
此外,尝试执行使用jni库的类的主方法失败:
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
以下是父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>
和客户端应用程序:
import jnibook.HelloWorld;
public class App {
public static void main(String ... args){
(new HelloWorld()).print();
}
}
我没有成功。
我不知道出了什么问题
有什么想法吗 这可能是一个过时的问题,但我还是会回答: 运行java JNI应用程序时,必须告诉它在哪里可以找到保存JNI使用的相关本机C代码的.so库。 例如,如果您在可执行jar app.jar中关闭了应用程序:
java-Djava.library.path=[本机C库的路径]-jar-app.jar
PS-您可以看到JVM找不到本机C库,这要感谢以下异常:
java.lang.unsatifiedLinkError:no-nar-library-1.0-SNAPSHOT in java.library.path
我已经在3.6.0版本的插件中尝试了我自己的示例变体。有了这个版本,我至少可以
Unpacking 1 dependencies to /home/karsten/svn/hellotest/target/nar
我尝试了几种指定java.library.path
的方法,但没有成功
<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>
package jnibook;
public class HelloWorld {
public native void print();
static {
NarSystem.loadLibrary();
}
}
import jnibook.HelloWorld;
public class App {
public static void main(String ... args){
(new HelloWorld()).print();
}
}
Unpacking 1 dependencies to /home/karsten/svn/hellotest/target/nar
LD_LIBRARY_PATH=target/nar/hellojni-0.0-amd64-Linux-gpp-jni/lib/amd64-Linux-gpp/jni mvn nar:nar-integration-test