java - 为 Raspberry Pi 编译 JD2XX

Question

对于 Openhab2，有一个名为 RFXCOM 的绑定(bind)插件。但问题是这个附加组件使用的 JD2XX 与 Raspberry Pi 的 ARM 架构不兼容。

我找到了一个 Github 存储库，其中包含可用于编译 *.so 文件的源代码:https://github.com/0x6a77/JD2XX

对 Makefile 进行一些更改以使用正确的 Java 路径(zulu-8-armhf-embedded 而不是 (oracle-7)。

运行sudo make jni创建一个*.so文件，我将其复制到/usr/lib(在java库路径内)。但是我仍然收到 Raspberry Pi 无法打开共享库的错误，因为它是 32 位的。如何使用 Github 存储库提供的源代码编译适用于 ARM 的共享库。

错误消息:

java.lang.UnsatisfiedLinkError: 
/var/lib/openhab2/tmp/libjd2xx5892592723514582617.so: 
/var/lib/openhab2/tmp/libjd2xx5892592723514582617.so: cannot open shared object file: 
No such file or directory (Possible cause: can't load IA 32-bit .so on a ARM-bit platform)

Raspberry Pi 全新安装了 Openhabian .

Github 上问题的链接:https://github.com/openhab/openhab2-addons/issues/2316#issuecomment-304795652

编辑:

11:00:52.291 [ERROR] [rnal.discovery.RFXComBridgeDiscovery] - Error occurred during discovery
java.io.IOException: device not found (2)
    at jd2xx.JD2XX.listDevices(Native Method)
    at jd2xx.JD2XX.listDevicesByDescription(JD2XX.java:785)
    at org.openhab.binding.rfxcom.internal.discovery.RFXComBridgeDiscovery.discoverRfxcom(RFXComBridgeDiscovery.java:89)
    at org.openhab.binding.rfxcom.internal.discovery.RFXComBridgeDiscovery.startScan(RFXComBridgeDiscovery.java:66)
    at org.eclipse.smarthome.config.discovery.AbstractDiscoveryService.startScan(AbstractDiscoveryService.java:199)
    at org.eclipse.smarthome.config.discovery.internal.DiscoveryServiceRegistryImpl.startScan(DiscoveryServiceRegistryImpl.java:382)
    at org.eclipse.smarthome.config.discovery.internal.DiscoveryServiceRegistryImpl.startScans(DiscoveryServiceRegistryImpl.java:358)
    at org.eclipse.smarthome.config.discovery.internal.DiscoveryServiceRegistryImpl.startScan(DiscoveryServiceRegistryImpl.java:216)
    at org.eclipse.smarthome.io.rest.core.discovery.DiscoveryResource.scan(DiscoveryResource.java:84)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_121]
    at java.lang.reflect.Method.invoke(Method.java:498)[:1.8.0_121]
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)[157:org.glassfish.jersey.core.jersey-common:2.22.2]
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)[157:org.glassfish.jersey.core.jersey-common:2.22.2]
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)[157:org.glassfish.jersey.core.jersey-common:2.22.2]
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)[157:org.glassfish.jersey.core.jersey-common:2.22.2]
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)[157:org.glassfish.jersey.core.jersey-common:2.22.2]
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)[157:org.glassfish.jersey.core.jersey-common:2.22.2]
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)[158:org.glassfish.jersey.core.jersey-server:2.22.2]
    at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473)[155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
    at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)[155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)[155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)[155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)[155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
    at com.eclipsesource.jaxrs.publisher.internal.ServletContainerBridge.service(ServletContainerBridge.java:76)[10:com.eclipsesource.jaxrs.publisher:5.3.1.201602281253]
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)[81:org.eclipse.jetty.servlet:9.2.19.v20160908]
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)[81:org.eclipse.jetty.servlet:9.2.19.v20160908]
    at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71)[172:org.ops4j.pax.web.pax-web-jetty:4.3.0]
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)[79:org.eclipse.jetty.security:9.2.19.v20160908]
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:287)[172:org.ops4j.pax.web.pax-web-jetty:4.3.0]
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)[81:org.eclipse.jetty.servlet:9.2.19.v20160908]
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80)[172:org.ops4j.pax.web.pax-web-jetty:4.3.0]
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.server.Server.handle(Server.java:499)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)[80:org.eclipse.jetty.server:9.2.19.v20160908]
    at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)[72:org.eclipse.jetty.io:9.2.19.v20160908]
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)[83:org.eclipse.jetty.util:9.2.19.v20160908]
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)[83:org.eclipse.jetty.util:9.2.19.v20160908]
    at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]
11:01:02.868 [WARN ] [e.sshd.server.channel.ChannelSession] - Unknown pty opcode value: 42

Answer 1

在 JD2XX.java 文件中，您可以看到如何根据操作系统加载 dll、so 或其他类型的库的机制。

static {
    String dataModel = System.getProperty("sun.arch.data.model");
    String osName = System.getProperty("os.name").toLowerCase();;

    StringBuilder lib = new StringBuilder("/jni/");

    if (osName.contains("win"))
        lib.append("win/");
    else if (osName.contains("linux"))
        lib.append("linux/");
    else if (osName.contains("mac"))
        lib.append("mac/");
    else
        throw new UnsatisfiedLinkError("Loading JD2XX JNI: Unsupported operating system ("+osName+")");

    if (dataModel.equals("32"))
        lib.append("x86_32/");
    else if (dataModel.equals("64"))
        lib.append("x86_64/");
    else
        throw new UnsatisfiedLinkError("Loading JD2XX JNI: Unknown runtime data model ("+dataModel+")");

    if (osName.contains("win"))
        lib.append("jd2xx.dll");
    else if (osName.contains("linux"))
        lib.append("libjd2xx.so");
    else if (osName.contains("mac"))
        lib.append("libjd2xx.jnilib");

    try {
        NativeUtils.loadLibraryFromJar(lib.toString());
    } catch (IOException e) {
        throw new UnsatisfiedLinkError(e.getMessage());
    }
}

NativeUtils 中的 loadLibraryFromJar 方法创建临时目录并将操作系统的正确库复制到临时目录，然后最终调用 System.load 方法。因此，我认为如果可能的话，您应该将这部分源代码修改为如下代码。

static
{
   System.load("/var/lib/openhab2/tmp/libjd2xx5892592723514582617.so");
}

或

static
{
   System.load("/usr/lib/libjd2xx5892592723514582617.so");
}

有多种方法可以使此作业正常工作，首先重新设置“java.library.path”顺序以指示/usr/lib 目录，然后使用下面的代码。

或者您可以将/usr/lib 中的库名称 libjd2xx5892592723514582617.so 重命名为 libjd2xx.so，通常位于“LD_LIBRARY_PATH”变量中。

那么，就可以使用我们在JD2XX.java中的代码来代替，

static
{
   System.loadLibrary("jd2xx");
}

我认为它有效..