Lucene的索引不跨平台

在windows上使用Lucene生成索引文件，将索引文件复制到Linux服务器上，报错“校验错误，可能是硬件问题”。

所以，Lucene的跨平台只是代码跨平台，生成的索引不跨平台。

使用Java自带的ObjectStream也是一样，实际上并不跨平台。

一定要学会使用日志，重视日志。

e.printStackTrace()默认把错误输出到了标准错误流，所以在日志文件中是看不见异常的。正确姿势是使用logger.error(String msg,Throwable e);

也可以使用System.setErr()进行输入输出重定向，把信息打印到某个文件中去，但是，这种方式不如打印到日志文件中好。日志系统的设计考虑了很多，现在的日志系统不仅效率极高，而且格式化很好、很系统，便于分析找出错误。

三军未动，粮草先行。要把日志摆到头等位置。

下面是异常详情：

org.apache.lucene.index.CorruptIndexException: checksum failed (hardware problem?) : expected=58f3d50e actual=af1eb55c (resource=BufferedChecksumIndexInput(MMapIndexInput(path="/home/ubuntu/poem-index/poem/segments_2")))
	at org.apache.lucene.codecs.CodecUtil.checkFooter(CodecUtil.java:416)
	at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:400)
	at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:284)
	at org.apache.lucene.index.StandardDirectoryReader$1.doBody(StandardDirectoryReader.java:57)
	at org.apache.lucene.index.StandardDirectoryReader$1.doBody(StandardDirectoryReader.java:54)
	at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:685)
	at org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:77)
	at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:63)
	at data.model.PoemData.loadIndex(PoemData.java:27)
	at controller.MyApplication.init(MyApplication.java:47)
	at controller.MyApplication.configure(MyApplication.java:58)
	at org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:119)
	at org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:87)
	at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5178)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:724)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:952)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:473)
	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1617)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1483)
	at org.apache.catalina.manager.HTMLManagerServlet.upload(HTMLManagerServlet.java:285)
	at org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:206)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
	at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:136)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
	at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:586)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)