Dynamically building property names and retrieving their values

[Chad Woolley]

Dion,
Thanks a lot for the response, that got me there (with a workaround). 
However, that concatenation doesn't appear to work, so I had to assign 
to an intermediate var.  Looks like it thinks it's a number if I use 
concatenation.  Any ideas on how to fix this?  The Jexl docs seem to 
indicate that + works for string concatenation...

Here is my goal:
    <goal name="testing">
    	<echo>ccgateway.db.id=${ccgateway.db.id}</echo>
		<j:set var="dbIdVar" value="${project.name}.db.id"/>
		<j:set var="db.id" value="${context.findVariable(dbIdVar)}"></j:set>
    	<echo>1) db.id=${db.id}</echo>
		<j:set var="db.id" value="${context.findVariable(project.name + 
'db.id')}"></j:set>
    	<echo>2) db.id=${db.id}</echo>
    </goal>

which outputs:
testing:
    [echo] ccgateway.db.id=cwoolley_mboxservice
    [echo] 1) db.id=cwoolley_mboxservice
ASTIdentifier : java.lang.NumberFormatException: For input string: "db.id"
java.lang.NumberFormatException: For input string: "db.id"
        at 
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
        at 
java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1207)
        at java.lang.Double.valueOf(Double.java:202)
        at java.lang.Double.<init>(Double.java:277)
        at 
org.apache.commons.jexl.util.Coercion.coerceDouble(Coercion.java:160)
        at 
org.apache.commons.jexl.parser.ASTAddNode.value(ASTAddNode.java:116)
        at 
org.apache.commons.jexl.parser.ASTExpression.value(ASTExpression.java:85)
        at 
org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:47)
        at 
org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:106)
        at 
org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:88)
        at 
org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:123)
        at 
org.apache.commons.jelly.expression.jexl.JexlExpression.evaluate(JexlExpression.java:115)
        at org.apache.commons.jelly.tags.core.SetTag.doTag(SetTag.java:130)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:279)
        at 
org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:135)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:79)
        at 
org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:110)
        at com.werken.werkz.Goal.fire(Goal.java:639)
        at com.werken.werkz.Goal.attain(Goal.java:575)
        at com.werken.werkz.WerkzProject.attainGoal(WerkzProject.java:193)
        at 
org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:634)
        at org.apache.maven.MavenSession.attainGoals(MavenSession.java:266)
        at org.apache.maven.cli.App.doMain(App.java:486)
        at org.apache.maven.cli.App.main(App.java:1215)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at com.werken.forehead.Forehead.run(Forehead.java:551)
        at com.werken.forehead.Forehead.main(Forehead.java:581)
    [echo] 2) db.id=
BUILD SUCCESSFUL


Dion Gillard <[EMAIL PROTECTED]> wrote:
${context.findVariable(project.id + '.db.info')}

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