Newbie first steps [help, please]

[ZioNemo]

H All,
I am trying to use FreeMaker, but I seem unable to use the default wrapper.
I tried to compile (slightly modified) one of the trivial examples, but it fails miserably.
Could someone point me in the right direction??
Many thanks in Advance.

If meaningful: what I need to do is to write a java application (no web) that should generate c-code from a certain model, so I need to access model fields, iterators, ...

Current (failing) test code is:

package com.softin.IOCbuilder.model;

import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;

import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.SimpleHash;
import freemarker.template.Template;
import freemarker.template.TemplateException;

class TestObject {
    private String name;
    private int price;

    public TestObject(String name, int price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {return name;}
    public int getPrice() {return price;}
   
    public double sin(double x) {
        return Math.sin(x);
    }
} 

public class Root {
    SimpleHash root = null;

    public Root() {
        root = new SimpleHash();
        root.put("theString", "wombat");
        root.put("theObject", new TestObject("green mouse", 1200));         
    }
   
    public static void main(String[] args) {
        Configuration cfg = new Configuration();
        try {
            cfg.setDirectoryForTemplateLoading(new File("templates"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        cfg.setObjectWrapper(new DefaultObjectWrapper());

        Template temp;
        try {
            temp = cfg.getTemplate("test.ftl");
            Root r = new Root();

            Writer out = new OutputStreamWriter(System.out);
            try {
                temp.process(r.getRoot(), out);
            } catch (TemplateException e) {
                e.printStackTrace();
            }
            out.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }       
    }

    public SimpleHash getRoot() {
        return root;
    }

}

test template is:

${theString}
${theObject.name}
${theObject.price}
${theObject.sin(123)} 
======================================
It fails on the second line.

Again:
Many thanks in advance
Mauro

[Nobody/Anonymous]

Hi Zionemo,

Looks like you've made a good start. Only problem you seem to have here is the use of an internal class.

I think Freemarker cannot properly inspect internal classes like the one you have created. If you break this out into a separate class it will run smoothly.

-Pete

[Attila Szegedi]

FM should be able to inspect inner classes just fine. However, a method is available to FreeMarker only if the method is public and is declared in a public class or interface. (Note this doesn't mean the class of the object must be public, but in that case the method must be declared in a public superclass or public implemented interface)

[Nobody/Anonymous]

That'd be why then.

As soon as I put the object in a separate class I instinctively made it public...

-Pete

[ZioNemo]

Hi Attila,
I really tried to adhere to the manual, but it doesn't work for me :(

Pretty please, could You look at my code (almost completely cut & paste from the manual) and point me in the right direction?.

The getter methods are there ("public String getName()" is the first that fails).

If I do not use the class inspection (e.g.: if I just use things put into SimpleHash) it works!

It seems to me I'm missing something that will enable class inspection... but I don't know what!!

If it's of any interest:
I'm using sun jdk1.5.0_08 and its rte.
I'm using eclipse 3.2.0.
Using Project->Properties->FreeMarker Context->New I can define a theObject<->TestObject association and after that I *am* able to use code completion in the test.ftl file (e.g.: it will suggest name & price, but not sin() after I type "${theObject."
Running the resulting class, however, will fail with:

Apr 19, 2007 5:37:47 PM freemarker.log.JDK14LoggerFactory$JDK14Logger error
SEVERE:

Expression theObject.name is undefined on line 3, column 3 in test.ftl.
The problematic instruction:
----------
==> ${theObject.name} [on line 3, column 1 in test.ftl]
...

Please help.

!!!!!!!!WAIT!!!!!!!!!!

I just added a "public" to "class TestObject" and it worked!!!
previously it was default.

I will do some more tests.

Thanks, for the time being!
Mauro

[ZioNemo]

Hi Pete,
Thanks, but no joy :-((((

i moved the TestObject class to its own file.

If I modify the template to:
${theString}
${theObject}

the program runs to completion with the following output:
wombat
com.softin.IOCbuilder.model.TestObject@b0f13d

If I have a full template:
${theString}
${theObject}
${theObject.name}
${theObject.price}
${theObject.sin(123)} 

it dies with:
wombat
com.softin.IOCbuilder.model.TestObject@ae000d

Expression theObject.name is undefined on line 3, column 3 in test.ftl.
The problematic instruction:
----------
==> ${theObject.name} [on line 3, column 1 in test.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression theObject.name is undefined on line 3, column 3 in test.ftl.
    at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
    at freemarker.core.Expression.getStringValue(Expression.java:118)
    at freemarker.core.Expression.getStringValue(Expression.java:93)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
    at freemarker.core.Environment.visit(Environment.java:196)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:196)
    at freemarker.core.Environment.process(Environment.java:176)
    at freemarker.template.Template.process(Template.java:232)
    at com.softin.IOCbuilder.model.Root.main(Root.java:39)
Apr 19, 2007 3:46:57 PM freemarker.log.JDK14LoggerFactory$JDK14Logger error
SEVERE:

Expression theObject.name is undefined on line 3, column 3 in test.ftl.
The problematic instruction:
----------
==> ${theObject.name} [on line 3, column 1 in test.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression theObject.name is undefined on line 3, column 3 in test.ftl.
    at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
    at freemarker.core.Expression.getStringValue(Expression.java:118)
    at freemarker.core.Expression.getStringValue(Expression.java:93)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
    at freemarker.core.Environment.visit(Environment.java:196)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:196)
    at freemarker.core.Environment.process(Environment.java:176)
    at freemarker.template.Template.process(Template.java:232)
    at com.softin.IOCbuilder.model.Root.main(Root.java:39)

Expression theObject.name is undefined on line 3, column 3 in test.ftl.
The problematic instruction:
----------
==> ${theObject.name} [on line 3, column 1 in test.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression theObject.name is undefined on line 3, column 3 in test.ftl.
    at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
    at freemarker.core.Expression.getStringValue(Expression.java:118)
    at freemarker.core.Expression.getStringValue(Expression.java:93)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
    at freemarker.core.Environment.visit(Environment.java:196)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:196)
    at freemarker.core.Environment.process(Environment.java:176)
    at freemarker.template.Template.process(Template.java:232)
    at com.softin.IOCbuilder.model.Root.main(Root.java:39)

It really seems I cannot access anything inside the TestObject.
What am I doing wrong?

Thanks in Advance!
Mauro