How to fill HashMap from java property file with Spring @Value

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You can use the SPEL json-like syntax to write a simple map or a map of list in property file.

simple.map={'KEY1': 'value1', 'KEY2': 'value3', 'KEY3': 'value5'}

map.of.list={\
  'KEY1': {'value1','value2'}, \
  'KEY2': {'value3','value4'}, \
  'KEY3': {'value5'} \
 }

I used \ for multiline property to enhance readability

Then, in Java, you can access and parse it automatically with @Value like this.

@Value("#{${simple.map}}")
Map<String, String> simpleMap;

@Value("#{${map.of.list}}")
Map<String, List<String>> mapOfList;

Here with ${simple.map}, @Value gets the following String from the property file:

"{'KEY1': 'value1', 'KEY2': 'value3', 'KEY3': 'value5'}"

Then, it is evaluated as if it was inlined 

@Value("#{{'KEY1': 'value1', 'KEY2': 'value3', 'KEY3': 'value5'}}")

You can learn more in the official documentation

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