Accessing system properties in SpEL programmatically

[Narada]

Hi,

According to the docs this works.

<bean id="taxCalculator" class="org.spring.samples.TaxCalculator">
    <property name="defaultLocale" value="#{ systemProperties['user.region'] }"/>
</bean>

However accessing system properties programmatically in SpEL does not work.

    @Test
    public void testGetSystemProperty() {
        System.setProperty("foo", "bar");
        ExpressionParser parser = new SpelExpressionParser();
        Expression exp = parser.parseExpression("systemProperties['foo']");
        String value = exp.getValue(String.class);
        assertEquals("bar", value);
    }

What obvious piece of information am I missing? Is this predefined variable only registered on context load and if using programmatically this is something I have to register by myself?

    @Test
    public void testGetSystemProperty() {
        System.setProperty("foo", "bar");
        EvaluationContext context = new StandardEvaluationContext();
        context.setVariable("systemProperties", System.getProperties());
        ExpressionParser parser = new SpelExpressionParser();
        Expression exp = parser.parseExpression("#systemProperties['foo']");
        String value = exp.getValue(context, String.class);
        assertEquals("bar", value);
    }

Works but not quite the same :)

Thanks.

[fdemilde]

the obvious thing I notice is, compared to your xml configuration, your SpEL in java code is not wrapped inside

#{ ... } 

. Could you verify if this might be the cause?

[Narada]

Hi. Tried that already. That prefix and suffix should only be present in context files and not when using programmatically as far as I can tell. It allows Spring to identify SpEL syntax. If you use them programmatically SpEL throws an exception anyway. Thanks.

[Costin Leau]

As mentioned in another thread, Narada could you please raise an issue regarding this problem? It looks like a bug but AndyC will tell what the verdict is.

Thanks!

[Narada]

Done thanks.

http://jira.springframework.org/browse/SPR-6651