java.lang.UnsatisfiedLinkError : org. apache.log4j.nt.NTEventLogAppender.registerEventSource

Question

我有一个使用 tomcat 部署的 java web 服务。我正在尝试使用 log4j 和 NTEventLog dll 从 java 写入事件查看器。我将“NTEventLogAppender.dll”添加到系统路径上的 C:\Program Files\Java\jdk1.7.0_10\bin 中，并使用 regsvr32 命令注册它。

我遇到以下异常:

5263 [http-8080-2] ERROR org.apache.axis2.transport.http.AxisServlet  - org.apache.log4j.nt.NTEventLogAppender.registerEventSource(Ljava/lang/String;Ljava/lang/String;)I
java.lang.UnsatisfiedLinkError: org.apache.log4j.nt.NTEventLogAppender.registerEventSource(Ljava/lang/String;Ljava/lang/String;)I
    at org.apache.log4j.nt.NTEventLogAppender.registerEventSource(Native Method)
    at org.apache.log4j.nt.NTEventLogAppender.<init>(NTEventLogAppender.java:79)
    at org.apache.log4j.nt.NTEventLogAppender.<init>(NTEventLogAppender.java:49)
    at packagecct1.Procurements.<init>(Procurements.java:101)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.apache.axis2.util.Utils$8.run(Utils.java:768)
    at org.apache.axis2.java.security.AccessController.doPrivileged(AccessController.java:132)
    at org.apache.axis2.util.Utils.createServiceObject(Utils.java:765)
    at org.apache.axis2.receivers.AbstractMessageReceiver.makeNewServiceObject(AbstractMessageReceiver.java:245)
    at org.apache.axis2.receivers.AbstractMessageReceiver.getTheImplementationObject(AbstractMessageReceiver.java:282)
    at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:78)
    at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
    at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114)
    at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
    at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
    at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)

log4j.属性:

#log4j.rootLogger=DEBUG,CA,NTEventLog 
log4j.rootLogger=DEBUG,CA        

#Console Appender 
log4j.appender.CA=org.apache.log4j.ConsoleAppender 
log4j.appender.CA.layout=org.apache.log4j.PatternLayout 
log4j.appender.CA.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n 

#File Appender 
log4j.appender.FA=org.apache.log4j.FileAppender 
log4j.appender.FA.File=sample.log 
log4j.appender.FA.layout=org.apache.log4j.PatternLayout 
log4j.appender.FA.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

#Event Log Appender
log4j.appender.NTEventLog=org.apache.log4j.nt.NTEventLogAppender
log4j.appender.NTEventLog.layout=org.apache.log4j.PatternLayout
log4j.appender.NTEventLog.layout.ConversionPattern=%m%n
log4j.appender.NTEventLog.source=ESBWebServices


# Set the logger level of File Appender to WARN 
log4j.appender.FA.Threshold = WARN

java代码:

    System.loadLibrary("NTEventLogAppender");

    BasicConfigurator.configure();
    NTEventLogAppender eventLogAppender = new NTEventLogAppender();
    eventLogAppender.setSource("ESBWebServices");

    eventLogAppender.setLayout(new PatternLayout("%m"));
    eventLogAppender.activateOptions();
    logger.addAppender(eventLogAppender);

    logger.info("Hello World!");

请注意我使用 eclipse 作为 IDE。

Answer 1

Apache Log4J v1.2.17 仅包含预构建的 amd64 兼容 DLL(称为 NTEventLogAppender.amd64.dll)。当 NTEventLogAppender 运行时，它会查看系统架构 (System.getProperty( "os.arch"))，然后尝试加载 DLL 的 amd64、ia64 或 x86 版本，该 DLL 必须位于名为:NTEventLogAppender..dll 的文件中。

Apache 不仅仅提供所有可能的 DLL，而是为您提供了 src，以便能够在发行版的 src/ntdll 中为您的目标体系结构构建您自己的 DLL。有两种构建方法，一种使用 MinGW，另一种使用 MS Visual Studio 构建工具。我使用后者通过在此目录中运行命令 ant msbuild 来构建我自己的 DLL。

这不是一个轻松的过程，我必须寻找各种库和头文件以及构建它所需的 rc、mc、cl 和链接 EXE。最后，我必须将构建的 DLL 重命名为 NTEventLogAppender.x86.dll 并将其放在我的路径中才能获取它。

无论如何，因为我找不到上传此 DLL 文件的位置，所以我在此处创建了该文件的 Base64 哈希值的要点:https://gist.github.com/alpian/5614954 。获取文本并将其通过任何一个免费的在线 Base64 转换器并将其保存到适当命名的 DLL 文件中，然后就完成了。这可能比自己构建更容易，也可能不是! :)