Injecting Null and Empty String Values in Spring

In this post we’ll see how to inject null and empty string values into constructor argument or property in Spring.

Injecting empty string in Spring

In Spring if you have to set any property to the empty String value then pass (“”) as a value for that property.

For example if you have an Employee bean and you want to set its email property to the empty String value (“”).

<bean id="employeeBean" class="com.knpcode.SpringProject.EmployeeBean">
	<property name="email" value="" />
</bean>

If injected as a constructor argument-

<bean id="employeeBean" class="com.knpcode.SpringProject.EmployeeBean">
  <constructor-arg name="email" value="" />        
</bean>

Injecting null value in Spring

To inject null value into any property use the <null/> element. Keep in mind not to assign null as value=”null” as that would inject “null” as a String value, use <null/> element for null value.

<bean id="employeeBean" class="com.knpcode.SpringProject.EmployeeBean">
	<property name="email"><null/></property>
</bean>

If injected as a constructor argument-

<bean id="employeeBean" class="com.knpcode.SpringProject.EmployeeBean">
	<constructor-arg name="email"><null/></constructor-arg>
</bean>

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