Spring Expression Language the syntax to designate a Spring expression for evaluation at runtime is ...

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Spring Expression Language
the syntax to designate a Spring expression for evaluation at runtime is #{ “SpEL expression string”}
#{systemProperties['system.propery.flag'] ?: false }

#{itemBean}
#{itemBean.name} 
@Value("#{itemBean}")
@Value("#{itemBean.name}")

@Value("#{'Thomas Lake Drive'}")
@Value("#{55121}")

@Value("#{systemProperties['os.arch'].equals('x86')? winDataSource : unixDataSource}")

METHOD FACTORY WIRING
@Value("#{fileService.createFile()}")
private File file;

STATIC METHOD WIRING
@Value("#{ T(Math).random()}")
private double powerLevel;

#{otherBean.method().length()}
#{T(java.lang.Integer).MIN_VALUE}
How to avoid exceptions
Instead of a single period (.) you need to precede a period with a question mark (?). 
<property name="prop" value="#{otherBean.method()?.toUpperCase()}"/>
#{otherBean.method() != null ? otherBean.method().length() : -1}

Regular Expressions - tru/false
<property name="onlyDigits" value="#{otherMean.method() matches '\d+'}" />

Collection selection can have another syntax.
<property name="topSubjects" value="#{subjectList.?[id gt 111 and id lt 113]}"/>
<property name="mycity" value="#{cities[2]}"/>

Arithmetic Operations
<property name="mrp"value="#{counter.total+25}"/>

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Spring Expression Language (SpEL) was one of the new features that debuted with Spring 3.0.  Spring 3.0 was released back in December 2009.  So that makes this feature a little less than four years ol...

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