Spring Boot and Mustache – default value

In Spring Boot + Mustache template environment, if we didn’t assign a value to a {{variable}} on the Mustache’s page, the jmustache will throws the following error messages :

com.samskivert.mustache.MustacheException$Context: No method or field with name 'variable' on line xx
 at com.samskivert.mustache.Template.checkForMissing(Template.java:316) ~[jmustache-1.13.jar:na]
 at com.samskivert.mustache.Template.getValue(Template.java:224) ~[jmustache-1.13.jar:na]
 at com.samskivert.mustache.Template.getValueOrDefault(Template.java:269) ~[jmustache-1.13.jar:na]

P.S Tested with Spring Boot 1.5.2.RELEASE

Solution 1

If the variable is optional, try to wrap like this:

{{#variable}}
    {{.}}
{{/variable}}

Solution 2

Alternatively, in Spring Boot, override the Mustache.Compiler to provide a default value globally:

SpringBootWebApplication.java

package com.mycareerrepublic.web;

import com.samskivert.mustache.Mustache;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.mustache.MustacheEnvironmentCollector;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.core.env.Environment;

@SpringBootApplication
@ComponentScan({"com.mycareerrepublic"})
public class SpringBootWebApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootWebApplication.class, args);
    }

    //Override MustacheAutoConfiguration to support defaultValue("")
    @Bean
    public Mustache.Compiler mustacheCompiler(Mustache.TemplateLoader mustacheTemplateLoader,
                                              Environment environment) {

        MustacheEnvironmentCollector collector = new MustacheEnvironmentCollector();
        collector.setEnvironment(environment);

  // default value
        Mustache.Compiler compiler = Mustache.compiler().defaultValue("")
   .withLoader(mustacheTemplateLoader)
            .withCollector(collector);
        return compiler;

    }

}

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About Mariano

I'm Ethan Mariano a software engineer by profession and reader/writter by passion.I have good understanding and knowledge of AngularJS, Database, javascript, web development, digital marketing and exploring other technologies related to Software development.