springboot整合mybatis-plus使用代码生成器报错：Caused by: freemarker.core.Configurable$UnknownSettingException: Unknown FreeMarker configuration setting: 

 

 1 Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
 2 2020-12-09 18:12:45.747 ERROR 8216 --- [           main] o.s.boot.SpringApplication               : Application run failed
 3 
 4 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'freeMarkerConfigurer' defined in class path resource [org/springframework/boot/autoconfigure/freemarker/FreeMarkerServletWebConfiguration.class]: Invocation of init method failed; nested exception is freemarker.core.Configurable$UnknownSettingException: Unknown FreeMarker configuration setting: "recognize_standard_file_extensions"
 5     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788) ~[spring-beans-5.3.1.jar:5.3.1]
 6     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-5.3.1.jar:5.3.1]
 7     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.1.jar:5.3.1]
 8     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.1.jar:5.3.1]
 9     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.1.jar:5.3.1]
10     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.1.jar:5.3.1]
11     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.1.jar:5.3.1]
12     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.1.jar:5.3.1]
13     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:925) ~[spring-context-5.3.1.jar:5.3.1]
14     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.1.jar:5.3.1]
15     at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.0.jar:2.4.0]
16     at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) [spring-boot-2.4.0.jar:2.4.0]
17     at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.4.0.jar:2.4.0]
18     at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) [spring-boot-2.4.0.jar:2.4.0]
19     at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) [spring-boot-2.4.0.jar:2.4.0]
20     at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) [spring-boot-2.4.0.jar:2.4.0]
21     at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) [spring-boot-2.4.0.jar:2.4.0]
22     at org.to_zero.springboot.cache.CacheApplication.main(CacheApplication.java:12) [classes/:na]
23 Caused by: freemarker.core.Configurable$UnknownSettingException: Unknown FreeMarker configuration setting: "recognize_standard_file_extensions"
24     at freemarker.core.Configurable.unknownSettingException(Configurable.java:1703) ~[freemarker-2.3.23.jar:2.3.23]
25     at freemarker.core.Configurable.setSetting(Configurable.java:1636) ~[freemarker-2.3.23.jar:2.3.23]
26     at freemarker.template.Configuration.setSetting(Configuration.java:2312) ~[freemarker-2.3.23.jar:2.3.23]
27     at freemarker.core.Configurable.setSettings(Configurable.java:1770) ~[freemarker-2.3.23.jar:2.3.23]
28     at org.springframework.ui.freemarker.FreeMarkerConfigurationFactory.createConfiguration(FreeMarkerConfigurationFactory.java:276) ~[spring-context-support-5.3.1.jar:5.3.1]
29     at org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer.afterPropertiesSet(FreeMarkerConfigurer.java:120) ~[spring-webmvc-5.3.1.jar:5.3.1]
30     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1847) ~[spring-beans-5.3.1.jar:5.3.1]
31     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1784) ~[spring-beans-5.3.1.jar:5.3.1]
32     ... 17 common frames omitted

 

解决：

freemarker版本问题，替换依赖为：

         <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>