If else in spring context with the prop key - spring

Question

Is there a way to provide another value for key if null? I want to use the source and dest db. But if dest db details are null then use source.
<bean id="dataSource" class="com.zaxxer.hikari.HikariConfig">
<property name="poolName" value="springHikariCP" />
<property name="dataSourceClassName" value="oracle.jdbc.pool.OracleDataSource" />
<property name="maximumPoolSize" value="${maximumPoolSize}" />
<property name="idleTimeout" value="${idleTimeout}" />
<property name="connectionTimeout" value="${connectionTimeout}" />
<property name="dataSourceProperties">
<props>
<prop key="url">${dest.db.url}</prop>
<prop key="user">${dest.db.user}</prop>
<prop key="password">${dest.db.password}</prop>
</props>
</property>
</bean>
What I tried:
<property name="dataSourceProperties">
<props>
<prop key="url">${dest.db.url?:${src.db.url}}</prop>
<prop key="user">${dest.db.user?:${src.db.user}}</prop>
<prop key="password">${dest.db.password?:${src.db.password}}</prop>
</props>
</property>
</bean>
Though the dest db details are not null, the data is being written into the source. Not sure why? Is there something wrong in the way I'm defining it?

Answer 1

You can use ternary operator to specify an if-else condition in spel. Take a look at this:
http://www.mkyong.com/spring3/spring-el-ternary-operator-if-then-else-example/