降低freemarker版本.

build.gradle

@@ -37,7 +37,7 @@ ext {
 			"druid":"com.alibaba:druid:1.0.29",
 			"fastjson":"com.alibaba:fastjson:1.2.37",
 			"tomcatjdbc":"org.apache.tomcat:tomcat-jdbc:9.0.2",
-			"freemarker":"org.freemarker:freemarker:2.3.23",
+			"freemarker":"org.freemarker:freemarker:2.3.9",
 
             // spring boot
             "springboot-autoconfigure":"org.springframework.boot:spring-boot-autoconfigure:${springBootVersion}",

mybatis-plus-generate/src/main/java/com/baomidou/mybatisplus/generator/engine/FreemarkerTemplateEngine.java

@@ -39,7 +39,7 @@ public class FreemarkerTemplateEngine extends AbstractTemplateEngine {
     @Override
     public FreemarkerTemplateEngine init(ConfigBuilder configBuilder) {
         super.init(configBuilder);
-        configuration = new Configuration(Configuration.VERSION_2_3_0);
+        configuration = new Configuration();
         configuration.setDefaultEncoding(ConstVal.UTF8);
         configuration.setClassForTemplateLoading(FreemarkerTemplateEngine.class, "/");
         return this;