SpringBoot 项目启动报错：
第一次启动报错：
Caused by: java.lang.NoSuchMethodError: freemarker.template.Configuration.<init>(Lfreemarker/template/Version;)V at org.springframework.ui.freemarker.FreeMarkerConfigurationFactory.newConfiguration(FreeMarkerConfigurationFactory.java:328) at org.springframework.ui.freemarker.FreeMarkerConfigurationFactory.createConfiguration(FreeMarkerConfigurationFactory.java:258) at org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer.afterPropertiesSet(FreeMarkerConfigurer.java:120) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1767) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1704) ... 16 common frames omitted第二次启动报错：
*************************** APPLICATION FAILED TO START *************************** Description: An attempt was made to call the method freemarker.template.Configuration.<init>(Lfreemarker/template/Version;)V but it does not exist. Its class, freemarker.template.Configuration, is available from the following locations: jar:file:/C:/Users/javam/.m2/repository/org/freemarker/freemarker/2.3.20/freemarker-2.3.20.jar!/freemarker/template/Configuration.class It was loaded from the following location: file:/C:/Users/javam/.m2/repository/org/freemarker/freemarker/2.3.20/freemarker-2.3.20.jar Action: Correct the classpath of your application so that it contains a single, compatible version of freemarker.template.Configuration由报错提示信息可知，加载 freemarker.jar 包 <init> 时没有发现。
解决方案：更换 jar 版本。
<dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.20</version> </dependency>修改为：
<dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.28</version> </dependency>项目启动正常！
