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！
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