SpringBoot启动Tomcat报错LibraryNotFoundError，Can't load library:tcnative-1.dll

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本文详细解析了SpringBoot项目中使用最新SpringCloud和内嵌Tomcat时，遇到的JNI动态链接库未找到的问题。通过分析异常栈信息，指出问题源于Tomcat的connector组件未能找到必要的.dll库文件，提供了官方下载链接及解决方案，即将所需库文件放置于C:WindowsSystem32目录下。

环境：Windows10-64位，SpringCloud是最新的Greenwich.RC2，SpringBoot是2.1.1，内嵌Tomcat 9.0.13，

最近搭建的SpringCloud项目，把日志级别设为Debug后，从控制台看到启动时tomcat报无法找到JNI动态链接库的错误，完整的异常栈信息如下：

org.apache.tomcat.jni.LibraryNotFoundError: Can't load library: D:\xxx\bin\tcnative-1.dll, Can't load library: D:\xxx\bin\libtcnative-1.dll, no tcnative-1 in java.library.path, no libtcnative-1 in java.library.path
	at org.apache.tomcat.jni.Library.<init>(Library.java:102) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.tomcat.jni.Library.initialize(Library.java:206) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.catalina.core.AprLifecycleListener.init(AprLifecycleListener.java:198) [tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.catalina.core.AprLifecycleListener.isAprAvailable(AprLifecycleListener.java:107) [tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.apache.catalina.connector.Connector.<init>(Connector.java:80) [tomcat-embed-core-9.0.13.jar:9.0.13]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:164) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540) [spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
	at cc.liudun.SpringCloudDemoApplication.main(SpringCloudDemoApplication.java:21) [classes/:na]

这是因为Tomcat中的connector为了提高性能，采用了加载与操作系统绑定（非跨平台）的本地库的方式，比如Windows系统中就是.dll动态链接库。上述异常中找不到的两个.dll库文件，默认会去Tomcat的bin目录下去找，但是由于SpringBoot的Tomcat是嵌入式的，没有这两个.dll，所以只好自己去官网下载，到如下官方地址下载，并放到C:\Windows\System32\目录下：

http://archive.apache.org/dist/tomcat/tomcat-connectors/native/1.2.14/binaries/