Issue
We basically have the same problem as this question poses, but for lists and additionally, we are looking for a global solution.
Currently we have a REST call that is defined like this:
@RequestMapping
@ResponseBody
public Object listProducts(@RequestParam(value = "attributes", required = false) List<String> attributes) {
The call works fine and the list attributes will contain two elements "test1:12,3" and "test1:test2" when called like this:
product/list?attributes=test1:12,3&attributes=test1:test2
However, the list attributes will also contain two elements, "test1:12" and "3" when called as follows:
product/list?attributes=test1:12,3
The reason for this is, that in the first case, Spring will use a ArrayToCollectionConverter in the first case. In the second case it will use a StringToCollectionConverter which will split the argument using "," as a separator.
How can I configure Spring Boot to ignore the comma in the parameter? The solution should be global if possible.
What we have tried:
This question does not work for us, because we have a List instead of an array. Besides, this would be a controller-local solution only.
I also tried to add this configuration:
@Bean(name="conversionService")
public ConversionService getConversionService() {
ConversionServiceFactoryBean bean = new ConversionServiceFactoryBean();
bean.setConverters(Collections.singleton(new CustomStringToCollectionConverter()));
bean.afterPropertiesSet();
return bean.getObject();
}
where CustomStringToCollectionConverter is a copy of the Spring StringToCollectionConverter, but without the splitting, however, the Spring converter still gets called preferentially.
On a hunch, I also tried "mvcConversionService" as a bean name, but that did not change anything either.
Solution
You can remove the StringToCollectionConverter and replace it with your own in WebMvcConfigurerAdapter.addFormatters(FormatterRegistry registry) method:
Something like this:
@Configuration
public class MyWebMvcConfig extends WebMvcConfigurerAdapter {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.removeConvertible(String.class,Collection.class);
registry.addConverter(String.class,Collection.class,myConverter);
}
}
Answered By - Strelok
Answer Checked By - Senaida (JavaFixing Volunteer)
