Spring Boot 1.5.2 FreeMarker change from DEBUG mode to RETHROW mode - spring

Question

How do I change the FreeMarker "DEBUG" mode to the "RETHROW" mode in Spring Boot 1.5.2. I'm getting the following message in my browser when an exception occurs:
FreeMarker template error (DEBUG mode; use RETHROW in production!)
I've tried adding the following property to application.properties file:
spring.freemarker.template_exception_handler=rethrow
according to the following site: http://blog.64p.org/entry/2016/03/24/175906
but that didn't work.
Edit:
I saw there is a class called FreeMarkerProperties that has a class definition like the following:
#ConfigurationProperties(prefix = "spring.freemarker")
public class FreeMarkerProperties extends AbstractTemplateViewResolverProperties {
I assume this class should be filled with all the properties that starts with "spring.freemarker"
It has a method called getSettings. I decided to see what is returns if I autowire FreeMarkerProperties into my CommandLineRunner.
I changed my class that implements CommandLineRunner to the following:
#Component
public class ApplicationLoader implements CommandLineRunner {
private static final Logger logger = LoggerFactory.getLogger(ApplicationLoader.class);
...
#Autowired
FreeMarkerProperties properties;
#Override
#Transactional
public void run(String... strings) throws Exception {
StringBuilder sb = new StringBuilder();
for (String option : strings) {
sb.append(" ").append(option);
}
sb = sb.length() == 0 ? sb.append("No Options Specified") : sb;
logger.info(String.format("WAR launched with following options: %s", sb.toString()));
logger.info("FREEMARKER PROPERTIES");
for(String path : properties.getTemplateLoaderPath()) {
logger.info(path);
}
for(String setting : properties.getSettings().keySet()) {
logger.info("Freemarker: " + setting);
}
Which output the following:
2017-03-22 09:58:19.257 INFO 6635 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-03-22 09:58:19.292 INFO 6635 --- [ main] com.example.ApplicationLoader : WAR launched with following options: No Options Specified
2017-03-22 09:58:19.292 INFO 6635 --- [ main] com.example.ApplicationLoader : FREEMARKER PROPERTIES
2017-03-22 09:58:19.292 INFO 6635 --- [ main] com.example.ApplicationLoader : classpath:/templates/
2017-03-22 09:58:19.852 INFO 6635 --- [ main] com.example.DemoApplication : Started DemoApplication in 11.67 seconds (JVM running for 12.339)
So it seems like the FreemarkerProperties's getSettings method returns an empty list of settings. My application.properties:
# Spring Boot configuration.
# Uncomment below line to enable mobile device detection.
#spring.mobile.devicedelegatingviewresolver.enabled: true
spring.metrics.export.delay-millis=10000
spring.datasource.url=jdbc:postgresql://localhost:5432/**COMMENTED OUT***
spring.datasource.username=*
spring.datasource.password=*
spring.datasource.driver-class-name=org.postgresql.Driver
spring.jpa.hibernate.ddl-auto=create
server.session.timeout=1800
spring.freemarker.template_exception_handler=rethrow
Am I doing something wrong here? Why is the settings not populated in the FreemarkerProperties class?

Answer 1

In your application.properties try using
spring.freemarker.settings.template_exception_handler=rethrow

Answer 2

In the Spring Boot Module of one of my apps I'm loading the Freemarker Properties file with a #PropertySource annotation.
#SpringBootApplication
#PropertySource("classpath:/standalone.properties")
public class MailLauncher {
public static void main(String[] args) {
ApplicationContext ctx = new
AnnotationConfigApplicationContext("com.nixmash.blog.mail",
"com.nixmash.blog.jpa");
MailDemo demo = ctx.getBean(MailDemo.class);
demo.init();
((ConfigurableApplicationContext) ctx).close();
}
}
I'm not extending AbstractTemplateViewResolverProperties but rather using a config Bean
#Bean
public FreeMarkerViewResolver freemarkerViewResolver() {
FreeMarkerViewResolver resolver = new FreeMarkerViewResolver();
resolver.setPrefix("");
resolver.setCache(false);
resolver.setOrder(3);
return resolver;
}
Here's the .properties file.
spring.freemarker.enabled=false
spring.freemarker.template-loader-path=classpath:/freemarker/
spring.freemarker.charset=UTF-8
spring.freemarker.cache=false
spring.freemarker.check-template-location=false
spring.freemarker.settings.locale=en_US
If your application includes multiple modules and application.properties files it could also be a matter of one module .properties file overriding your FreeMarker module .properties file. Renaming the FreeMarker module .properties file and using #PropertySource would expose the properties, in that case.