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From "Matthias Hendler" <hendl...@gmx.de>
Subject Re: Problem getting value from Map.
Date Fri, 06 Oct 2006 15:14:49 GMT
Hello Daryl,

well, your class is package private and it must be of public type.
You added a package private class into the velocity context. 
This class is not accessible for velocity.
Declare the class BO public and it should work.

What else might confuse you - it confused me :-) - is, that if a method
returns "null" in java, velocity logs an invalid reference message.
This might happen for $Map.put(value). To ommit this, use the silent notation like $!Map.put(value).
This notation ignores the return value from the put method.


Regards
Matthias






-------- Original-Nachricht --------
Datum: Fri, 6 Oct 2006 10:40:17 -0400
Von: "Daryl Beattie" <DarylB@date.com>
An: velocity-user@jakarta.apache.org
Betreff: Problem getting value from Map.

> Hi Velocity people,
> 
>  
> 
>             Okay, first off; I tried searching for answers to this, but
> the mailing list archive is not searchable (in any way that I could
> find), so if this question is a faq, please don't be upset.
> 
>             I am having trouble getting a value out of a Map. Every time
> I try, the reference gets printed out as it is. Even normal methods
> don't seem to be functioning consistently.
> 
>             I have developed a test case to illustrate my problem. The
> code may look long but it's pretty simple:
> 
>  
> 
> class BO extends BOBase {
> 
>   // Empty.
> 
> }
> 
>  
> 
> class BOBase extends DataHolder {
> 
>   // Empty.
> 
> }
> 
>  
> 
> class DataHolder extends HashMap<Name, Value> {
> 
>   public Value getA() {
> 
>     return this.get(new Name("a")); //$NON-NLS-1$
> 
>   }
> 
>   @Override
> 
>   public Value get(Object key) {
> 
>     return super.get(new Name(key.toString()));
> 
>   }
> 
> }
> 
>  
> 
> class Name {
> 
>   String name;
> 
>   public Name(String name) {
> 
>     this.name = name;
> 
>   }
> 
>   @Override
> 
>   public String toString() {
> 
>     return name;
> 
>   }
> 
>   @Override
> 
>   public boolean equals(Object a) {
> 
>     return ((a != null) && (a instanceof Name) &&
> a.toString().equals(this.toString()));
> 
>   }
> 
>   @Override
> 
>   public int hashCode() {
> 
>     return name.hashCode();
> 
>   }
> 
> }
> 
>  
> 
> class Value {
> 
>   String value;
> 
>   public Value(String value) {
> 
>     this.value = value;
> 
>   }
> 
>   @Override
> 
>   public String toString() {
> 
>     return value;
> 
>   }
> 
> }
> 
>  
> 
>             And when I run velocity I do this:
> 
>  
> 
> VelocityContext context = new VelocityContext();
> 
>  
> 
> BO test = new BO();
> 
> test.put(new Name("a"), new Value("1"));
> 
> context.put("bo", test);
> 
>  
> 
> Map<Name, Value> test2 = new HashMap<Name, Value>();
> 
> test2.put(new Name("a"), new Value("1"));
> 
> context.put("bo2", test2);
> 
> context.put("a", new Name("a"));
> 
>  
> 
> context.put("test", new String("Boo!"));
> 
>  
> 
>             My template looks like this:
> 
>  
> 
> $bo.A
> 
> $bo.getA()
> 
> $bo.get("a")
> 
>  
> 
> $bo2.get($a)
> 
>  
> 
> $test
> 
>  
> 
>             But my output looks like this:
> 
>  
> 
> $bo.A
> 
> $bo.getA()
> 
> $bo.get("a")
> 
>  
> 
> 1
> 
>  
> 
> Boo!
> 
>  
> 
>             What is going on?
> 
>  
> 
> Sincerely,
> 
>  
> 
>             Daryl.
> 

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