爲樹莓派編譯JD2XX

Question

對於Openhab2，有一個名爲RFXCOM的綁定附加組件。然而，問題是這個附加組件使用的JD2XX與Raspberry Pi的ARM架構不兼容。

我發現與您可以用它來編譯* .so文件的源Github上庫：https://github.com/0x6a77/JD2XX

的Makefile中變化不大使用了正確的Java路徑（祖魯 - 8 armhf嵌入式代替（甲骨文-7）。

運行sudo make jni創建*.so文件，我複製到/usr/lib（Java庫路徑中），但我仍然得到錯誤的樹莓派不能打開共享庫因它是32位的，你如何編譯一個適用於ARM的共享庫和Github存儲庫提供的源代碼。

錯誤消息：

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) 

樹莓裨具有Openhabian全新安裝。

鏈接到該問題在Github上：https://github.com/openhab/openhab2-addons/issues/2316#issuecomment-304795652

編輯：

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，你可以看到機制是如何加載一個dll，這樣或一些其他類型的庫取決於操作系統。

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()); 
    } 
} 

從NativeUtils的loadLibraryFromJar方法創建臨時目錄和操作系統複製正確的庫來臨時目錄然後最終調用System.load方法。 因此，我認爲如果可能的話，您應該修改源代碼的這一部分，如下所示。

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

或

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

有幾種方法，使這項工作的工作重新設置「的java.library.path」以第一指示/ usr/lib目錄，然後使用下面的代碼。

或者您可以將庫名稱libjd2xx5892592723514582617.so重命名爲/ usr/lib中的libjd2xx.so，它通常位於'LD_LIBRARY_PATH'變量中。

然後，我們在JD2XX.java代碼可以用來代替，

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

我認爲它的工作原理..