Thymeleaf templates error in Heroku

Question

I implemented my application on Heroku, just for testing... Locally everything works well, but in Heroku after I log in with the credentials I am directed to the page sac/index, what is right, but return to me:

"Whitelabel Error Page

This application has no Explicit Mapping for /error, so you are Seeing this as a fallback.

Tue May 30 19:56:32 UTC 2017 There was an Unexpected error (type=Internal Server Error, status=500). Error resolving template "/Sac/index", template Might not exist or Might not be accessible by any of the configured Template Resolvers"

However, when I access another page as /sac/listUsers works normally.

This is my Controller:

@RequestMapping("/sac/index")
public ModelAndView home(){
    ModelAndView modelAndView = new ModelAndView();
    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    User user = userService.findUserByEmail(auth.getName());
    modelAndView.addObject("userName", user.getName() + " (" + user.getEmail() + ")");
    modelAndView.setViewName("/sac/index");
    return modelAndView;
}

My http configuration:

@Override
protected void configure(HttpSecurity http) throws Exception {      
    http.
        authorizeRequests()
            .antMatchers("/").permitAll()
            .antMatchers("/login").permitAll()              
            .antMatchers("/sac/registration").hasAuthority("ADMIN")
            .antMatchers("/sac/consultarUsuarios").hasAuthority("ADMIN")
            .antMatchers("/sac/index").hasAnyAuthority("ADMIN", "SUPPORT")
            .antMatchers("/sac/**").hasAnyAuthority("ADMIN", "SUPPORT").anyRequest()                
            .authenticated().and().csrf().disable().formLogin()
            .loginPage("/login").failureUrl("/login?error=true")
            .defaultSuccessUrl("/sac/index")
            .usernameParameter("email")
            .passwordParameter("password")
            .and().logout()
            .logoutRequestMatcher(new AntPathRequestMatcher("/logout"))
            .logoutSuccessUrl("/login").and().exceptionHandling()
            .accessDeniedPage("/access-denied");
}

Pom.xml:

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>

            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                    <configuration>
                        <finalName>${project.artifactId}</finalName>
                    </configuration>
                </execution>
            </executions>
        </plugin>


        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <finalName>${project.artifactId}</finalName>
            </configuration>
        </plugin>
    </plugins>

</build>

Application properties:

# ===============================
# = Thymeleaf configurations
# ===============================
spring.thymeleaf.enabled=true
spring.thymeleaf.check-template-location=true
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
spring.thymeleaf.cache=false

Someone knows what I’m doing wrong?

Answer 1

Yesterday a user who unfortunately do not remember the nick answered and gave me the solution. Unfortunately the same deleted the comment. So stay here my thanks!

The solution given by this user was to remove the first "/" from the following line in my controller:

Before:

modelAndView.setViewName("/sac/index");

Afterward:

modelAndView.setViewName("sac/index");