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I want to define default property value in Spring XML configuration file. I want this default value to be null.
Something like this:
... <ctx:property-placeholder location="file://${configuration.location}" ignore-unresolvable="true" order="2" properties-ref="defaultConfiguration"/> <util:properties id="defaultConfiguration"> <prop key="email.username" > <null /> </prop> <prop key="email.password"> <null /> </prop> </util:properties> ... This doesn't work. Is it even possible to define null default values for properties in Spring XML configuration?
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If no default value is declared explicitly, the default value is the null value. This usually makes sense because a null value can be considered to represent unknown data. In a table definition, default values are listed after the column data type.
To set a default value for primitive types such as boolean and int, we use the literal value: @Value("${some. key:true}") private boolean booleanWithDefaultValue; @Value("${some.
Spring @Value annotation is used to assign default values to variables and method arguments. We can read spring environment variables as well as system variables using @Value annotation. Spring @Value annotation also supports SpEL.
It is better to use Spring EL in such way
<property name="password" value="${email.password:#{null}}"/> it checks whether email.password is specified and sets it to null (not "null" String) otherwise
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