我想创建一个可移植的opencv
应用程序,将依赖项添加到maven文件pom.xml
。
简化代码是:
import org.opencv.core.Mat;
public class Builder {
public static void main(String[] args) {
nu.pattern.OpenCV.loadShared();
System.loadLibrary(org.opencv.core.Core.NATIVE_LIBRARY_NAME);
Mat mat = new Mat(4,3,1);
System.out.println(mat.dump());
}
}
我将此添加到pom.xml
:
<dependency>
<groupId>org.openpnp</groupId>
<artifactId>opencv</artifactId>
<version>3.2.0-0</version>
<scope>compile</scope>
</dependency>
它适用于以下警告 for java 9 :
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by nu.pattern.OpenCV$SharedLoader (file:/home/martin/.m2/repository/org/openpnp/opencv/3.2.0-0/opencv-3.2.0-0.jar) to field java.lang.ClassLoader.usr_paths
WARNING: Please consider reporting this to the maintainers of nu.pattern.OpenCV$SharedLoader
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /tmp/opencv_openpnp6598848942071423284/nu/pattern/opencv/linux/x86_64/libopencv_java320.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
101, 115, 47;
108, 105, 98;
47, 108, 105;
98, 111, 112]
UPDATE:以及java 8的以下警告:
Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library/tmp/opencv_openpnp3835511967220002519/nu/pattern/opencv/linux/x86_64/libopencv_java320.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
在maven依赖项文件夹中折叠opencv jar会显示所有库都是灰色,如下所示:
如果我忽略此警告并且未在警告消息中将库与上述命令链接,该怎么办? 因为使用java使opencv可移植非常简单,我想知道如果没有问题,那么将来继续这个方法。
我使用JDK 9,Eclipse Oxygen.2,Fedora 27。
将来,应用程序的目标可能是windows。
答案 0 :(得分:0)
这是因为Java 9对非法访问进行了新的检查,并且在java 9发布后常常会出现这种安全警告。永久解决方案是向维护者报告错误并等待它们发布补丁更新。
但是,只有您自担风险,是的,您可以继续没有安全功能,即堆栈保护,具体取决于您正在讨论的此软件包的使用和范围。
答案 1 :(得分:0)
自Java 9更新以来,出现“发生了非法的反射访问操作”警告。
尝试替换Maven编译插件。当我确实按照以下示例从jdk1.8升级到jdk1.12时,通过在多个项目中修改pom.xml文件,已解决了Maven Build和Maven Install的问题:
更改版本:
{
"request": {
"city": "New York"
}
}
收件人:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<webXml>WebContent\WEB-INF\web.xml</webXml>
</configuration>
</plugin>
并且还更改了artifactId和版本自:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.3</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<webXml>WebContent\WEB-INF\web.xml</webXml>
</configuration>
</plugin>
收件人:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
当我重新运行Maven Build或Maven Install时,“发生了非法的反射访问操作”