To build Java project with OpenCV using Maven

Question

I need to build the project, which involv an OpenCV. It would be great, but libraries don't get into the library java.library.path for some reason. And when I try to run the code using the library I get this error:

*java.lang.UnsatisfiedLinkError: no jniopencv_highgui in java.library.path*

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>

  <groupId>ru.intemsys.reget.server</groupId>
  <artifactId>reget-server</artifactId>
  <version>0.1-alpha</version>
  <packaging>jar</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.build.timestamp.format>yyyyMMddhhmm</maven.build.timestamp.format>
    <platform.name>${os.name}-${os.arch}</platform.name>
    <product.year>2014</product.year>
    <jdkVersion>1.6</jdkVersion>
    <javacpp.version>0.7</javacpp.version>
    <javacv.version>0.7</javacv.version>
  </properties>

  <dependencies>
    <dependency>
        <groupId>commons-daemon</groupId>
        <artifactId>commons-daemon</artifactId>
        <version>1.0.10</version>
    </dependency>

      <dependency>
          <groupId>com.googlecode.javacpp</groupId>
          <artifactId>javacpp</artifactId>
          <version>${javacpp.version}</version>
      </dependency>
      <dependency>
          <groupId>com.googlecode.javacv</groupId>
          <artifactId>javacv</artifactId>
          <version>${javacv.version}</version>
      </dependency>
      <dependency>
          <groupId>com.googlecode.javacv</groupId>
          <artifactId>javacv</artifactId>
          <version>${javacv.version}</version>
          <classifier>linux-x86</classifier>
      </dependency>

      <dependency>
          <groupId>com.googlecode.javacv</groupId>
          <artifactId>javacv</artifactId>
          <version>${javacv.version}</version>
          <classifier>linux-x86_64</classifier>
      </dependency>

    <dependency>
        <groupId>com.xeiam.xchart</groupId>
        <artifactId>xchart</artifactId>
        <version>2.3.1</version>
    </dependency>

    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4.7</version>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
  </dependencies>

  <repositories>
      <repository>
          <id>javacpp</id>
          <name>JavaCPP</name>
          <url>http://maven2.javacpp.googlecode.com/git/</url>
      </repository>
      <repository>
          <id>javacv</id>
          <name>JavaCV</name>
          <url>http://maven2.javacv.googlecode.com/git/</url>
      </repository>
  </repositories>

  <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>${jdkVersion}</source>
                    <target>${jdkVersion}</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.4</version>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <includeScope>compile</includeScope>
                            <outputDirectory>${project.build.directory}/lib</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>2.3.1</version>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <classpathLayoutType>simple</classpathLayoutType>
                            <mainClass>ru.intemsys.reget.server.App</mainClass>
                            <packageName>ru.intemsys.reget.server</packageName>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <finalName>${artifactId}-${version}</finalName>
                </configuration>
            </plugin>
        </plugins>
  </build>

    <profiles>
        <profile>
            <id>linux</id>
            <activation>
                <os><name>linux</name></os>
            </activation>
            <properties>
                <os.name>linux</os.name>
            </properties>
        </profile>
        <profile>
            <id>macosx</id>
            <activation>
                <os><name>mac os x</name></os>
            </activation>
            <properties>
                <os.name>macosx</os.name>
            </properties>
        </profile>
        <profile>
            <id>windows</id>
            <activation>
                <os><family>windows</family></os>
            </activation>
            <properties>
                <os.name>windows</os.name>
            </properties>
        </profile>
        <profile>
            <id>i386</id>
            <activation>
                <os><arch>i386</arch></os>
            </activation>
            <properties>
                <os.arch>x86</os.arch>
            </properties>
        </profile>
        <profile>
            <id>i486</id>
            <activation>
                <os><arch>i486</arch></os>
            </activation>
            <properties>
                <os.arch>x86</os.arch>
            </properties>
        </profile>
        <profile>
            <id>i586</id>
            <activation>
                <os><arch>i586</arch></os>
            </activation>
            <properties>
                <os.arch>x86</os.arch>
            </properties>
        </profile>
        <profile>
            <id>i686</id>
            <activation>
                <os><arch>i686</arch></os>
            </activation>
            <properties>
                <os.arch>x86</os.arch>
            </properties>
        </profile>
        <profile>
            <id>amd64</id>
            <activation>
                <os><arch>amd64</arch></os>
            </activation>
            <properties>
                <os.arch>x86_64</os.arch>
            </properties>
        </profile>
        <profile>
            <id>x86-64</id>
            <activation>
                <os><arch>x86-64</arch></os>
            </activation>
            <properties>
                <os.arch>x86_64</os.arch>
            </properties>
        </profile>
    </profiles>
</project>

mvn -version

Apache Maven 3.0.4 Maven home: /usr/share/maven Java version: 1.7.0_25, vendor: Oracle Corporation Java home: /usr/lib/jvm/java-7-openjdk-i386/jre Default locale: ru_RU, platform encoding: UTF-8 OS name: "linux", version: "3.11.0-14-generic", arch: "i386", family: "unix"

uname -a

Linux PC-1 3.11.0-14-generic #21-Ubuntu SMP Tue Nov 12 17:07:40 UTC 2013 i686 i686 i686 GNU/Linux

What command do you run? IMO java.library.path option won't be set automatically. It should point to a directory containing the native modules of OpenCV most probably. — Tome
– Tome, Commented Mar 26, 2014 at 15:52
@Tome , mvn package. All *.so files are considered in result *.jar file in directories /com/googlecode/javacv/cpp/linux-x86_64/ and /com/googlecode/javacv/cpp/linux-x86/ — ftp27
– ftp27, Commented Mar 27, 2014 at 7:55
As far as I know, so files are not being used when packaged in a JAR file, they have to be directly accessible from the file system, so usually you end up with a structure like /lib/ for your jars, and /bin/ (or something else) for your so/dll files. That /bin/ must the the value of the java.library.path VM option that must be given when running your program. — Tome
– Tome, Commented Mar 27, 2014 at 9:46

Sam R. · Accepted Answer · 2014-06-24 09:44:15Z

2

There is a solution. All libs are in javacv-0.6-cppjars.zip

edited Jun 24, 2014 at 9:44

Sam R.

16.4k14 gold badges76 silver badges126 bronze badges

answered Mar 27, 2014 at 16:07

ftp27

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message · Accepted Answer · 2024-10-11 12:32:58Z

How to install OpenCV on Linux in 2023

Install and build OpenCV

# Install minimal prerequisites (Ubuntu 18.04 as reference)
sudo apt update && sudo apt install -y cmake g++ wget unzip

# Download and unpack sources
wget -O opencv.zip https://github.com/opencv/opencv/archive/4.x.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.x.zip

unzip opencv.zip
unzip opencv_contrib.zip

# Create build directory and switch into it
mkdir -p build && cd build

# Configure
cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-4.x/modules ../opencv-4.x

# Build
cmake --build .

# Install
sudo make install

By default OpenCV will be installed to the /usr/local directory.

➤  tree /usr/local/share/java/opencv4
/usr/local/share/java/opencv4
├── libopencv_java470.so
└── opencv-470.jar


0 directories, 2 files

So now you can use java bindings that you built or add maven pom.xml dependency. It's better to match versions, 4.7.0 and 4.7.0, but in my case version in maven repo was behind

        <dependency>
            <groupId>org.openpnp</groupId>
            <artifactId>opencv</artifactId>
            <version>4.6.0-0</version>
        </dependency>

Run java with environment parameter LD_LIBRARY_PATH

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/share/java/opencv4/

and load OpenCV from Java with

System.loadLibrary("opencv_java470"); // If bindings version match use System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

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