記一次解決jar包版本衝突

背景

當時是在將Excel導出從POI轉成使用EasyExcel

POI使用的maven座標如下：

<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>3.8</version>
</dependency>
<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi-ooxml</artifactId>
  <version>3.8</version>
</dependency>

EasyExcel添加的maven座標如下：

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>easyexcel</artifactId>
	<version>1.1.2-beat1</version>
</dependency>

編寫好代碼debug啓動項目，啓動沒任何報錯，在執行改方法時，控制檯報錯了，報錯信息如下：

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoSuchMethodError: org.apache.poi.ss.usermodel.Font.setBold(Z)V
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:978)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:167)
	at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
	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:748)
Caused by: java.lang.NoSuchMethodError: org.apache.poi.ss.usermodel.Font.setBold(Z)V
	at com.alibaba.excel.util.StyleUtil.buildDefaultCellStyle(StyleUtil.java:22)
	at com.alibaba.excel.context.WriteContext.<init>(WriteContext.java:99)
	at com.alibaba.excel.write.ExcelBuilderImpl.<init>(ExcelBuilderImpl.java:38)
	at com.alibaba.excel.ExcelWriter.<init>(ExcelWriter.java:58)
	at com.alibaba.excel.ExcelWriter.<init>(ExcelWriter.java:34)
	at com.wyj.controller.EasyExcelDemo.findAllExcelByEasyExcel(EasyExcelDemo.java:45)
	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.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
	... 47 common frames omitted

報錯信息大概的信息是說

在at com.alibaba.excel.util.StyleUtil類中的buildDefaultCellStyle方法中沒找到setBold(Z)V這個方法，點進StyleUtil這個類的源碼中，找到setBold(Z)V這個方法，在這裏調用了org.apache.poi.ss.usermodel.Font類的setBold(Z)V方法，從源碼中進入Font類中，發現的確沒有setBold(Z)V這個方法，但是不科學啊，EasyExcel底層是封裝了POI的，那麼它裏面一定引用了POI的jar包，相當於調用自己內部代碼的方法，不可能會找不到方法啊
突然意識到

既然EasyExcel內部引用了POI的jar包，但是我本來的pom.xml文件中也引用POI的jar，會不會是jar包版本衝突造成的呢？接下來，分別查看了本身pom.xml引用POI的版本，爲3.8，EasyExcel版本1.1.2-beat1內部引用的POI版本爲3.17
確認猜測

那麼就到POI版本爲3.8和3.17當中找到org.apache.poi.ss.usermodel.Font類看是否有setBold(Z)V這個方法

發現在POI3.8版本中Font這個類中並沒有setBold(Z)V這個方法，但是在POI3.17版本中Font這個類中卻有setBold(Z)V這個方法

確認原因

至此，差不多可以知道到底是什麼原因造成控制檯拋出這異常了：原因是EasyExcel 1.1.2-beat1版本中本應使用POI 3.17版本中的代碼，但是由於版本衝突卻使用了POI 3.8版本中的代碼，造成類中方法找不到而拋出這個異常的

那麼爲什麼會造成版本衝突呢？

maven在做版本管理時有一個重要的原則就是就近原則。啥是就是就近原則呢？就拿本例子來說，POI 3.8版本距離當前jar更近，而POI3.17版本更遠(POI 3.17版本還經過了一層EasyExcel 1.1.2-beat1版本)，所以在maven版本管理中，將使用POI 3.8版本

那麼如何解決呢？

將自身pom.xml文件中的POI 3.8依賴註釋掉即可

註釋了再ReImport

發現還是報這個錯

還存在的問題

突然想到會不會是依賴其他模塊，在其他模塊中也依賴了POI 3.8版本，導致在依賴的過程中也將依賴中的POI 3.8版本的jar也依賴進來了，IDEA使用Ctrl+Shirt+F全項目搜索poi，發現果然在依賴的模塊中也存在。

那麼如何解決呢？

在模塊的依賴中除去POI的jar包

<dependency>
	<groupId>com.wyj</groupId>
	<artifactId>test</artifactId>
	<version>0.0.1.RELEASE</version>
</dependency>

換成

<dependency>
	<groupId>com.wyj</groupId>
	<artifactId>test</artifactId>
	<version>0.0.1.RELEASE</version>
	<exclusions>
		<exclusion>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
		</exclusion>
		<exclusion>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
		</exclusion>
		<exclusion>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml-schemas</artifactId>
		</exclusion>
	</exclusions>
</dependency>

完成之後再ReImport

運行完美解決

斷橋殘雪

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