PebbleTemplateAvailabilityProvider doesn't find template files from the classpath

[kzmi]

Spring Boot : 2.1.7
pebble-spring-boot-starter : 3.1.0

PebbleTemplateAvailabilityProvider always fails to find the template files like:

• {classpath}/templates/index.pebble
• {classpath}/templates/error/404.pebble

In PebbleTemplateAvailabilityProvider.java, this code returns always false.

return resourceLoader.getResource(prefix + view + suffix).exists();

resourceLoader was AnnotationConfigServletWebServerApplicationContext in my app, and the getResource() needs "classpath:" prefix to find a template file.

Before commit 0229ac7, PebbleTemplateAvailabilityProvider does so.

return resourceLoader
          .getResource(ResourceLoader.CLASSPATH_URL_PREFIX + prefix + view + suffix).exists();

If ResourceLoader.CLASSPATH_URL_PREFIX is not wanted in some cases, both prefix + view + suffix and ResourceLoader.CLASSPATH_URL_PREFIX + prefix + view + suffix should be tried.

[ebussieres]

If you take a look at others TemplateAvailabilityProvider, it's not necessary to add classpath prefix.

Mustache
Thymeleaf

[kzmi]

Mustache uses MustacheProperties.DEFAULT_PREFIX which has "classpath:" prefix.
https://github.com/gome-zhaojiuyang/-spring-boot-/blob/master/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/MustacheProperties.java#L31

Thymeleaf too.
https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafProperties.java#L42

[ebussieres]

Oh my bad ... so we need to change the default prefix

[ebussieres]

Gonna be fixed in next version