SpringBoot and Thymeleaf - Cannot initialize: no template resolvers have been set

我不是女神ヾ 2022-06-04 10:35 194阅读 0赞

> 在使用 Spring Boot 和 Thymeleaf 作为模板发送邮件的时候，遇到了`no template resolvers have been set` 异常

*  application.properties

spring.mail.host=smtpdm.aliyun.com
        spring.mail.port=465
        spring.mail.username=***
        spring.mail.password=***
        spring.mail.properties.smtp.auth=true
        spring.mail.properties.smtp.starttls.enable=true
        spring.mail.properties.smtp.starttls.required=true
    
        spring.thymeleaf.enabled=true
        spring.thymeleaf.prefix=classpath:/templates/
        spring.thymeleaf.check-template-location=true
        spring.thymeleaf.suffix=.html
        spring.thymeleaf.mode=HTML5
        spring.thymeleaf.encoding=UTF-8
        spring.thymeleaf.content-type=text/html
        spring.thymeleaf.cache=false

*  Junit 代码

@Test
        public void sendTemplateEmail() {
            logger.info("Start send email...");
            long startTime = System.currentTimeMillis();
            try {
                TemplateEngine templateEngine = new TemplateEngine();
                Context context = new Context();
                context.setVariable("url", "admin");
                String htmlContent = templateEngine.process("InternalServerErrorTemplate", context);
    
                MimeMessage message = mailSender.createMimeMessage();
                MimeMessageHelper messageHelper = new MimeMessageHelper(message);
    
                messageHelper.setFrom(MAIL_DELIVER);
                messageHelper.setTo(MAIL_DELIVER);
                messageHelper.setSubject("Template Email");
                messageHelper.setText(htmlContent, true);
    
                mailSender.send(message);
    
                logger.info("Send email success, cost {} million second", System.currentTimeMillis() - startTime);
            } catch (Exception e) {
                logger.error("Send email failed, error message is {}", e.getMessage());
                e.printStackTrace();
            }
        }

*  异常信息

org.thymeleaf.exceptions.ConfigurationException: Cannot initialize: no template resolvers have been set
        at org.thymeleaf.Configuration.initialize(Configuration.java:203)
        at org.thymeleaf.TemplateEngine.initialize(TemplateEngine.java:827)
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1038)
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1011)
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:924)
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:898)
        at cn.com.hellowood.mail.MailApplicationTests.sendTemplateEmail(MailApplicationTests.java:153)
        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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
        at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
        at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
        at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    2017-12-11 22:00:05.974 ERROR 3382 --- [           main] c.c.hellowood.mail.MailApplicationTests  : Send email failed, error message is Cannot initialize: no template resolvers have been set  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
        at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
        at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
        at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
        at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

--------------------

*  首先配置了 TemplateResolver

package cn.com.hellowood.mail.config;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Description;
    import org.springframework.web.servlet.ViewResolver;
    import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    import org.thymeleaf.spring4.SpringTemplateEngine;
    import org.thymeleaf.spring4.view.ThymeleafViewResolver;
    import org.thymeleaf.templateresolver.ServletContextTemplateResolver;
    import org.thymeleaf.templateresolver.TemplateResolver;
    
    @Configuration
    public class ThymeleafConfiguration extends WebMvcConfigurerAdapter {
    
        private final Logger logger = LoggerFactory.getLogger(getClass());
    
        @Bean
        @Description("Thymeleaf template resolver serving HTML5")
        public TemplateResolver templateResolver() {
            TemplateResolver templateResolver = new ServletContextTemplateResolver();
    
            templateResolver.setPrefix("/templates/mail/");
            templateResolver.setSuffix(".html");
            templateResolver.setCacheable(false);
            templateResolver.setTemplateMode("HTML5");
            templateResolver.setCharacterEncoding("UTF-8");
    
            logger.info("Config view resolver... ");
    
            return templateResolver;
        }
    
        @Bean
        @Description("Thymeleaf template engine with Spring integration")
        public SpringTemplateEngine templateEngine() {
            SpringTemplateEngine templateEngine = new SpringTemplateEngine();
            templateEngine.setTemplateResolver(templateResolver());
            return templateEngine;
        }
    
        @Bean
        @Description("Thymeleaf view resolver")
        public ViewResolver viewResolver() {
            ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
            viewResolver.setTemplateEngine(templateEngine());
            viewResolver.setCharacterEncoding("UTF-8");
    
            return viewResolver;
        }
    
        @Override
        public void addViewControllers(ViewControllerRegistry registry) {
            registry.addViewController("/").setViewName("index");
        }
    }

> 但是错误依然没有解决，后来在 Stack Overflow 上看到了解决方法：问题在于  
> `TemplateEngine templateEngine = new TemplateEngine();`是新生成一个 `TemplateEngine` 对象，这个对象没有任何配置，应当使用 `@Autowired` 注入对象

## 解决方法 ##

//将 
        TemplateEngine templateEngine = new TemplateEngine();
        //改为 
        @Autowired
        TemplateEngine templateEngine;

> [https://stackoverflow.com/questions/47125833/spring-and-thymeleaf-cannot-initialize-no-template-resolvers-have-been-set][https_stackoverflow.com_questions_47125833_spring-and-thymeleaf-cannot-initialize-no-template-resolvers-have-been-set]

[https_stackoverflow.com_questions_47125833_spring-and-thymeleaf-cannot-initialize-no-template-resolvers-have-been-set]: https://stackoverflow.com/questions/47125833/spring-and-thymeleaf-cannot-initialize-no-template-resolvers-have-been-set

SpringBoot and Thymeleaf - Cannot initialize: no template resolvers have been set

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