decision-state null test

[iwtolall]

Hi all,

I like to check in a flow if a not mandatory input is provided and dependedon the result I like to continue on different states.

I have tried to use a <decision-state> but the null check does not work. I have also tried to put ${} around the evaluation and different commands (empty, == null, is null)

    <input name="businessClassAttribute" value="flowScope.businessClassAttribute" required="false"/>

	<decision-state id="singleOrMultiView.decision">
		<if test="businessClassAttribute == null" then="viewBusinessClassAttributes.action" else="viewBusinessClassAttribute.view" />
	</decision-state>

Any ideas?

- Peter

[Keith Donald]

Hmmm, interesting - your first attempt should work as far as I can tell. I assume you are using the Unified EL right, therefore JBoss EL?

We do have a basic test case for null in our ELExpressionParserTests:

public void testParseNull() {
Expression exp = parser.parseExpression("null", null);
assertEquals(null, exp.getValue(null));
}

What is the error you are getting exactly?

Keith

[iwtolall]

Thanks for the quick reply Keith!

I assume you are using the Unified EL right, therefore JBoss EL?

I use the el-api shipped with the Tomcat 6 (located in TOMCAT_HOME/lib).

We do have a basic test case for null in our ELExpressionParserTests:

I have executed them without any error (with the el-api used from (TOMCAT_HOME/lib).

What is the error you are getting exactly?

Sorry that was bad explained in my initial post. I do not get an error message, the expression is never evaluated to true (always goes to the else case).

An input parameter of a flow is null in case not passed as a parameter? I do not have an object called ''businessClassAttribute" in conversation scope so the input param should be null!?
What would be the best point to debugg an enty into a subflow?

- Peter

[iwtolall]

I have done some cleanup of my flows (regarding inheritance) and now the problem is gone

Unfortunately I do not know why the error happened but probably due to an mistake of mine.

- Peter