我有一个使用Pi4J的简单Java类,其中包含一个主要方法。我想构建并将其部署到Raspberry Pi。我在Windows 10上使用Java 8,而我的IDE是NetBeans 8.1。如果将项目设置为普通(非Maven)Java应用程序,并设置为通过here所示的NetBeans构建配置部署到Raspberry Pi,则该项目将在jar上构建普通和FTP,然后使用没有问题。
我想做同样的事情,但使用Maven。问题是正在运行的代码具有Pi的ARM体系结构所固有的C代码,而我正在使用的Maven插件似乎首先在我的本地机器上运行了jar,其中C代码将崩溃并抛出Exception

严重:无法使用以下路径加载[libpi4j.so]:[/lib/libpi4j.so]
java.lang.IllegalArgumentException:路径必须是绝对路径,但是可以找到:\ lib \ libpi4j.so
在com.pi4j.util.NativeLibraryLoader.loadLibraryFromClasspath(NativeLibraryLoader.java:120)
在com.pi4j.util.NativeLibraryLoader.load(NativeLibraryLoader.java:92)
在com.pi4j.wiringpi.Gpio(Gpio.java:174)
在com.pi4j.io.gpio.RaspiGpioProvider。(RaspiGpioProvider.java:51)
在com.pi4j.io.gpio.GpioFactory.getDefaultProvider(GpioFactory.java:106)
在com.pi4j.io.gpio.impl.GpioControllerImpl。(GpioControllerImpl.java:54)
在com.pi4j.io.gpio.GpioFactory.getInstance(GpioFactory.java:89)
在com.hadronix.pi4jsample2.ControlGpioExample.main(ControlGpioExample.java:24)

线程“主”中的异常java.lang.UnsatisfiedLinkError:
com.pi4j.wiringpi.Gpio.wiringPiSetup()I在
com.pi4j.wiringpi.Gpio.wiringPiSetup(本机方法)位于
com.pi4j.io.gpio.RaspiGpioProvider。(RaspiGpioProvider.java:51)

com.pi4j.io.gpio.GpioFactory.getDefaultProvider(GpioFactory.java:106)

com.pi4j.io.gpio.impl.GpioControllerImpl。(GpioControllerImpl.java:54)
在com.pi4j.io.gpio.GpioFactory.getInstance(GpioFactory.java:89)处
com.hadronix.pi4jsample2.ControlGpioExample.main(ControlGpioExample.java:24)

如果我只是做一个干净的构建,它将很好构建并创建jar。但是,如果我选择运行构建,则多数民众赞成在崩溃发生的地方。这是我用来将jar部署到Pi的Maven插件。

<!-- OPTIONALLY DEPLOY THE FINAL JAR TO THE RASPBERRY PI -->
        <plugin>
            <artifactId>maven-antrun-plugin</artifactId>
            <executions>

                <!-- copy the compiled JAR file to the Raspberry Pi platform platform -->
                <execution>
                    <id>ControlGpioExample.jar</id>
                    <phase>install</phase>
                    <goals>
                        <goal>run</goal>
                    </goals>
                    <configuration>
                        <tasks>
                            <taskdef resource="net/sf/antcontrib/antcontrib.properties"
                                     classpathref="maven.plugin.classpath" />
                            <if>
                                <equals arg1="${pi.transfer.dev}" arg2="true" />
                                <then>
                                    <!-- ensure the target directory exists on the Raspberry Pi -->
                                    <sshexec host="${pi.host.dev}" port="${pi.port.dev}" username="${pi.user.dev}"
                                                                                     password="${pi.password.dev}" trust="true" failonerror="false"
                                                                                     verbose="true" command="mkdir --parents ${pi.dirCopyTo.dev}" />
                                    <!-- copy the JAR file to the Raspberry Pi -->
                                    <scp
                                        file="${project.build.directory}/${project.build.finalName}.jar"
                                        todir="${pi.user.dev}:${pi.password.dev}@${pi.host.dev}:${pi.dirCopyTo.dev}"
                                        port="${pi.port.dev}" trust="true" verbose="true" failonerror="true">
                                    </scp>
                                </then>
                            </if>
                        </tasks>
                    </configuration>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>org.apache.ant</groupId>
                    <artifactId>ant-jsch</artifactId>
                    <version>${ant-jsch.version}</version>
                </dependency>
                <dependency>
                    <groupId>com.jcraft</groupId>
                    <artifactId>jsch</artifactId>
                    <version>${jsch.version}</version>
                </dependency>
                <dependency>
                    <groupId>ant-contrib</groupId>
                    <artifactId>ant-contrib</artifactId>
                    <version>${ant-contrib.version}</version>
                </dependency>
            </dependencies>
        </plugin>

我试图弄清楚如何更改此插件以使其不首先在本地计算机上执行代码。我只是想让它假设jar是内置的,将ssh放入远程Pi并复制jar,然后在其中运行它。另外,如果有人在使用Maven时有完全更好的方法,那么我愿意提出建议。任何帮助将是巨大的!

这是我用作参考的链接
link 1

提前致谢。

最佳答案

已解决:此pom文件将构建Pi4J示例用例的可执行JAR。然后它将JAR传输到Raspberry Pi,然后执行它。在netbeans中,这是通过build命令完成的。因此,一个按钮即可构建,部署和运行!

我不喜欢的一件事是,它将依赖项作为软件包而不是原始的JAR引入。它还在构建时创建了两个JAR。一个有和没有依赖项。打开罐子,看看可以做些什么来改善结构。随时进行优化并提供反馈。

另外,为简化起见,我将RASPBERRY PI PROPERTIES放入此pom文件中。但是,这些应该位于settings.xml文件或类似内容中受控制的用户起始位置。

注意:Pi4J具有C代码本机ARM依赖关系,这使其无法在非ARM体系结构上运行,因此必须将其发送给Pi。

<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.company</groupId>
<artifactId>Swarm</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>

    <!-- DEFAULT RASPBERRY PI PROPERTIES -->
    <pi.host>192.168.1.20</pi.host>
    <pi.port>22</pi.port>
    <pi.user>root</pi.user>
    <pi.password>root</pi.password>
    <pi.deployDirectory>/home/pi/artifacts</pi.deployDirectory>
    <pi.main.class>com.company.test.ControlGpioExample</pi.main.class>

</properties>

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.pi4j</groupId>
        <artifactId>pi4j-core</artifactId>
        <version>1.0</version>
    </dependency>
</dependencies>

<build>
    <plugins>

        <!-- This plugin will generate JAR MANIFEST file inside the JAR in order to make our applicationeasily runnable -->
        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <mainClass>${pi.main.class}</mainClass>
                    </manifest>
                </archive>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
            </configuration>
            <executions>
                <execution>
                    <id>make-my-jar-with-dependencies</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

        <!--This plugin will Transfer the executable JAR file to the Pi and runs it -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-antrun-plugin</artifactId>
            <version>1.8</version>
            <executions>
                <execution>
                    <phase>install</phase>
                    <goals>
                        <goal>run</goal>
                    </goals>
                    <configuration>
                        <tasks>
                            <!-- ensure the target directory exists on the Raspberry Pi -->
                            <sshexec host="${pi.host}" port="${pi.port}" username="${pi.user}" password="${pi.password}"
                                     trust="true" failonerror="false" verbose="true"
                                     command="mkdir --parents ${pi.deployDirectory}"/>

                            <!-- copy the JAR file to the Raspberry Pi -->
                            <scp
                                file="${project.build.directory}/${project.build.finalName}-jar-with-dependencies.jar"
                                todir="${pi.user}:${pi.password}@${pi.host}:${pi.deployDirectory}"
                                port="${pi.port}" trust="true" verbose="true" failonerror="true">
                            </scp>

                            <!-- run the JAR file on the Raspberry Pi -->
                            <sshexec host="${pi.host}" port="${pi.port}" username="${pi.user}"
                                     password="${pi.password}" trust="true" failonerror="false"
                                     verbose="true"
                                     command="java -jar ${pi.deployDirectory}/${project.build.finalName}-jar-with-dependencies.jar"/>
                        </tasks>
                    </configuration>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>org.apache.ant</groupId>
                    <artifactId>ant-jsch</artifactId>
                    <version>1.9.6</version>
                </dependency>
            </dependencies>
        </plugin>
    </plugins>
</build>

08-17 01:37