simple-support — General user and support issues

[Simple-support] "class" attribute on parsing legacy xml

[Patrice <pat...@sm...>]

Hello,

I'm having difficulty reading an existing Xml file with "class" 
attribute.   The issue was mentionned by someone else on this list, and 
Niall's answer was to use CycleStrategy, but I can't figure out how.

Re: [Simple-support] Fine tuning CycleStrategy

[<Nia...@ub...>]

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[Simple-support] Fine tuning CycleStrategy

[Zvika M. <zv...@ti...>]

hi,

I'm serializing an object graph containing many database-retrieved(hibernate) entities, and they all have pre-generated ids. 

Is there a way of letting Simple use the object's builtin (database) id's for creating object references?
Also, is there a way of using CycleStrategy only for certain properties or property types, (using annotations or any other way)?

many thanks,
Zvika

Re: [Simple-support] obligation of "static public class" ?

[<Nia...@ub...>]

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Re: [Simple-support] obligation of "static public class" ?

[Patrice B. <pat...@sm...>]

Hi (& thanks),

I'm getting a NoSuchMethodException   (...) <init>(). 

Just like mentionned in

*[Simple-support] Problem deserializing an inner class
<http://sourceforge.net/mailarchive/message.php?msg_name=48AF5691.5040103%40znyx.com>*
From: Alan Deikman <Alan.Deikman@zn...> - 2008-08-23 00:15

java.lang.NoSuchMethodException: com.test.Outer$Inner.<init>()
  at java.lang.Class.getConstructor0(Class.java:2706)


I don't have my IDE at hand right now so I can't copy/paste, but that's
the exception.

An I see you answered "The inner class needs to be static. Otherwise it
can not be instantiated reflectively."

But none of the sample in tutorial have this "public static" attribute
for inner classes.   And when I do make it public static, I still get
the same exception.


Niall Gallagher a écrit :
> Hi,
>
> So what exception are you getting?
>
> Niall
>
> --- On Tue, 4/21/09, Patrice Bertrand <pat...@sm...> wrote:
>
>   
>> From: Patrice Bertrand <pat...@sm...>
>> Subject: [Simple-support] obligation of "static public class" ?
>> To: sim...@li...
>> Date: Tuesday, April 21, 2009, 1:22 AM
>> Hello,
>> I see some persons mention a similar problem:  an
>> exception occuring
>> when reading a list of elements.   And I
>> read Niall answering "you must
>> declare a 'static public class' for the embedded
>> items.   So I changed
>> my code to have both outer and inner classes in same file,
>> with inner
>> class declared as static public class within the first
>> class, like this:
>>
>> @Root
>> public class PropertyList {
>>
>>    @ElementList
>>    private List<Entry> list;
>>
>>    @Attribute
>>    private String name;
>>
>>    public String getName() {
>>       return name;
>>    }
>>
>>    public List getProperties() {
>>       return list;
>>    }
>>
>> @Root
>> public static class Entry {
>>
>>    @Attribute
>>    private String key;
>>
>>    @Element
>>    private String value;
>>
>>    public String getName() {
>>       return name;
>>    }
>>
>>    public String getValue() {
>>       return value;
>>    }
>> }
>>
>> }
>>
>>
>> (I take this from the tutorial page, but with a minor
>> change to embed
>> "Entry" into "PropertyList" and make it static.)
>>
>> However, I still get the same exception when
>> reading.   What is exactly
>> this obligation of a "public static class" and is it
>> possible to find
>> the rules that apply.   The tutorial is VERY
>> well done, for giving a
>> overview of the possibilities, but is it possible that the
>> sample code
>> that are in the tutorial would not work ?
>>
>> Sorry for this beginner's question.   I did
>> go through the archive
>> trying to find the answer (although search function seems
>> to be
>> unavailable).
>>
>>
>> ------------------------------------------------------------------------------
>> Stay on top of everything new and different, both inside
>> and 
>> around Java (TM) technology - register by April 22, and
>> save
>> $200 on the JavaOne (SM) conference, June 2-5, 2009, San
>> Francisco.
>> 300 plus technical and hands-on sessions. Register today. 
>> Use priority code J9JMT32. http://p.sf.net/sfu/p
>> _______________________________________________
>> Simple-support mailing list
>> Sim...@li...
>> https://lists.sourceforge.net/lists/listinfo/simple-support
>>
>>     
>
>
>       
>   

Re: [Simple-support] obligation of "static public class" ?

[Niall G. <gal...@ya...>]

Hi,

So what exception are you getting?

Niall

--- On Tue, 4/21/09, Patrice Bertrand <pat...@sm...> wrote:

> From: Patrice Bertrand <pat...@sm...>
> Subject: [Simple-support] obligation of "static public class" ?
> To: sim...@li...
> Date: Tuesday, April 21, 2009, 1:22 AM
> Hello,
> I see some persons mention a similar problem:  an
> exception occuring
> when reading a list of elements.   And I
> read Niall answering "you must
> declare a 'static public class' for the embedded
> items.   So I changed
> my code to have both outer and inner classes in same file,
> with inner
> class declared as static public class within the first
> class, like this:
> 
> @Root
> public class PropertyList {
> 
>    @ElementList
>    private List<Entry> list;
> 
>    @Attribute
>    private String name;
> 
>    public String getName() {
>       return name;
>    }
> 
>    public List getProperties() {
>       return list;
>    }
> 
> @Root
> public static class Entry {
> 
>    @Attribute
>    private String key;
> 
>    @Element
>    private String value;
> 
>    public String getName() {
>       return name;
>    }
> 
>    public String getValue() {
>       return value;
>    }
> }
> 
> }
> 
> 
> (I take this from the tutorial page, but with a minor
> change to embed
> "Entry" into "PropertyList" and make it static.)
> 
> However, I still get the same exception when
> reading.   What is exactly
> this obligation of a "public static class" and is it
> possible to find
> the rules that apply.   The tutorial is VERY
> well done, for giving a
> overview of the possibilities, but is it possible that the
> sample code
> that are in the tutorial would not work ?
> 
> Sorry for this beginner's question.   I did
> go through the archive
> trying to find the answer (although search function seems
> to be
> unavailable).
> 
> 
> ------------------------------------------------------------------------------
> Stay on top of everything new and different, both inside
> and 
> around Java (TM) technology - register by April 22, and
> save
> $200 on the JavaOne (SM) conference, June 2-5, 2009, San
> Francisco.
> 300 plus technical and hands-on sessions. Register today. 
> Use priority code J9JMT32. http://p.sf.net/sfu/p
> _______________________________________________
> Simple-support mailing list
> Sim...@li...
> https://lists.sourceforge.net/lists/listinfo/simple-support
> 


      

[Simple-support] obligation of "static public class" ?

[Patrice B. <pat...@sm...>]

Hello,
I see some persons mention a similar problem:  an exception occuring
when reading a list of elements.   And I read Niall answering "you must
declare a 'static public class' for the embedded items.   So I changed
my code to have both outer and inner classes in same file, with inner
class declared as static public class within the first class, like this:

@Root
public class PropertyList {

   @ElementList
   private List<Entry> list;

   @Attribute
   private String name;

   public String getName() {
      return name;
   }

   public List getProperties() {
      return list;
   }

@Root
public static class Entry {

   @Attribute
   private String key;

   @Element
   private String value;

   public String getName() {
      return name;
   }

   public String getValue() {
      return value;
   }
}

}


(I take this from the tutorial page, but with a minor change to embed
"Entry" into "PropertyList" and make it static.)

However, I still get the same exception when reading.   What is exactly
this obligation of a "public static class" and is it possible to find
the rules that apply.   The tutorial is VERY well done, for giving a
overview of the possibilities, but is it possible that the sample code
that are in the tutorial would not work ?

Sorry for this beginner's question.   I did go through the archive
trying to find the answer (although search function seems to be
unavailable).

Re: [Simple-support] Deserialize only parts of a xml file

[Timo R. <cr...@ol...>]

Hello Niall,

> It is very easy to do this with Simple. Check out the following in
> the tutorial.
> ...

oh shame on me, I really should have read that part of the tutorial
:) Great that this is possible with the Simple Framework.

Again, Simple has what I need :) Thanks a lot for that.


Regards,
Timo

Re: [Simple-support] Deserialize only parts of a xml file

[<Nia...@ub...>]

Hi,

It is very easy to do this with Simple. Check out the following in the
tutorial.

http://simple.sourceforge.net/download/stream/doc/tutorial/tutorial.php#
loosemap

This will allow you to create objects which will parse only the
annotations present on the class, and basically ignore/skip the rest.

Niall 

-----Original Message-----
From: Timo Rumland [mailto:cr...@ol...] 
Sent: 19 April 2009 00:14
To: sim...@li...
Subject: [Simple-support] Deserialize only parts of a xml file

Hello Simple users (and dev :),

I'm faced with a (so I think) very common problem with a large number of
serialized objects. I have to list all those objects in a JTable, with a
few columns only showing some attributes of the serialized objects
(let's say a name, a date and an ID).

Now the first and easiest way is, just iteratate over all serialized xml
files, deserialize each of them, get the needed attributes (name, date
and ID) and create a table entry for it, then go on with the next xml
file.

Since the xml files each contains a lot more data than just
name/date/ID, deserializing each of them is not memory efficient nor
performant.

What I need is some kind of streaming/parsing technology. So my question
is, can I use the Simple Framework to do this, or can Simple only be
used to fully deserialize an object?

If Simple can't help me here, can you suggest another framework (I'm
working with Java 6) to achieve my goal?


Thanks a lot for your help!


Regards,
Timo


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[Simple-support] Deserialize only parts of a xml file

[Timo R. <cr...@ol...>]

Hello Simple users (and dev :),

I'm faced with a (so I think) very common problem with a large number
of serialized objects. I have to list all those objects in a JTable,
with a few columns only showing some attributes of the serialized
objects (let's say a name, a date and an ID).

Now the first and easiest way is, just iteratate over all serialized
xml files, deserialize each of them, get the needed attributes (name,
date and ID) and create a table entry for it, then go on with the next
xml file.

Since the xml files each contains a lot more data than just
name/date/ID, deserializing each of them is not memory efficient nor
performant.

What I need is some kind of streaming/parsing technology. So my
question is, can I use the Simple Framework to do this, or can Simple
only be used to fully deserialize an object?

If Simple can't help me here, can you suggest another framework (I'm
working with Java 6) to achieve my goal?


Thanks a lot for your help!


Regards,
Timo

[Simple-support] TransformMatcher

[Fabian K. <fab...@we...>]

Hi List,

I created two classes which could be useful for others aswell:
First, an Annotation:
/**
  * Use this annotation to indicate that your class can be transformed.
  *
  * @author Fabian Kürten
  * @version 0.1
  */
@Retention(RetentionPolicy.RUNTIME)
public @interface Transformable {

	/**
	 * The transformers type.
	 *
	 * @return the type
	 */
	public Class<? extends Transform<?>> type();

}

And second, the TransformMatcher:
/**
  * This Matcher looks for the {@link Transformable} annotation to create a
  * suitable {@link Transform}.
  *
  * @see Transformable
  * @author Fabian K&uuml;rten
  * @version 0.1
  */
public class TransformMatcher
		implements
			Matcher {

	private final Matcher delegate;

	/**
	 * Creates the Matcher.
	 */
	public TransformMatcher() {
		this.delegate = null;
	}

	/**
	 * Creates the Matcher with a delegate Matcher.
	 *
	 * @param delegate the delegate will be called if no match could be found
	 */
	public TransformMatcher(Matcher delegate) {
		this.delegate = delegate;

	}

	public Transform match(Class type) throws Exception {
		Class<?> type2 = type;
		Transformable t = type2.getAnnotation(Transformable.class);
		if (t != null) {
			Class<?> transformerClass = t.type();
			Transform<?> transformer = (Transform<?>) transformerClass.newInstance();
			return transformer;
		} // t != null
		if (this.delegate != null) {
			return this.delegate.match(type);
		} else {
			return null;
		}
	}

}

The usage is quite simple, you have to use the Matcher of course:
Serializer serializer = new Persister(new TransformMatcher());
and annotate your class:
@Root
@Transformable(type=full.package.name.MyTransform.class)
public final class MyClass

I hope someone finds this useful.

Fabian

[Simple-support] ArrayTransform

[Fabian K. <fab...@we...>]

Hi Group, hi Niall,

(I composed this mail on 06.April, but sent it later)
I just tried to deserialize an *empty* double Array:
@Attribute
public double[] data;

<className data="" />

Now the problem is a
Exception in thread "main" java.lang.NumberFormatException: empty String

What happens is this:
ArrayTransform will first Transform the data to a String array using a 
split around ",". This will create the String array { "" } (one empty 
String).
Now ArrayTransform will try to convert this to doubles, which fails.

The other way works just fine, an empty double array will be converted 
to "".

In my opinion the empty String should be converted to the empty array.
I agree though, that maybe for Strings this is not the perfect Solution. 
However, currently new String[] {} and new String[] {""} produce the 
same serialization, which can't be desired either.

Fabian

Re: [Simple-support] Name clash Exception on Matcher

[Niall G. <gal...@ya...>]

Hi,

Thank you, I will look in to this. 

Regards,
Niall

--- On Thu, 4/2/09, Fabian Kürten <fab...@we...> wrote:

> From: Fabian Kürten <fab...@we...>
> Subject: [Simple-support] Name clash Exception on Matcher
> To: sim...@li...
> Date: Thursday, April 2, 2009, 11:58 AM
> Hi Niall,
> 
> I just got this:
> 
> Name clash: The method match(Class<T>) of type new
> Matcher(){} has the 
> same erasure as match(Class) of type Matcher but does not
> override it.
> 
> After partly understanding it[1], I think you could just
> change
> public Transform match(Class type) throws Exception;
> to
> public <T> Transform<T> match(Class<T>
> type) throws Exception;
> or something similiar.
> 
> As far as I understand this will keep compability to the
> current version 
> but allows additionally to use generics.
> 
> Fabian
> 
> [1] 
> http://stackoverflow.com/questions/502614/type-erasure-overriding-and-generics
> 
> ------------------------------------------------------------------------------
> _______________________________________________
> Simple-support mailing list
> Sim...@li...
> https://lists.sourceforge.net/lists/listinfo/simple-support
> 


      

[Simple-support] Name clash Exception on Matcher

[Fabian K. <fab...@we...>]

Hi Niall,

I just got this:

Name clash: The method match(Class<T>) of type new Matcher(){} has the 
same erasure as match(Class) of type Matcher but does not override it.

After partly understanding it[1], I think you could just change
public Transform match(Class type) throws Exception;
to
public <T> Transform<T> match(Class<T> type) throws Exception;
or something similiar.

As far as I understand this will keep compability to the current version 
but allows additionally to use generics.

Fabian

[1] 
http://stackoverflow.com/questions/502614/type-erasure-overriding-and-generics

Re: [Simple-support] can't serialize an object which uses aparametrized hashmap

[<Nia...@ub...>]

Hi,

This is because T does not exist. In java the generic type T used to
parameterize MyMap disappears after compilation. It's a process called
erasure and it means that the type can not be acquired reflectively at
runtime. There is talk of Java 7 resolving this issue but for Java 5 and
6 you will not be able to execute the code you have provided.

Niall 

-----Original Message-----
From: Joe [mailto:fis...@ya...] 
Sent: 01 April 2009 15:45
To: sim...@li...
Subject: [Simple-support] can't serialize an object which uses
aparametrized hashmap

Hi,

the following code throws an exception.
But if i replace T by String, serialization is no problem.

Why the parametrized version doesn't work?

Version: 2.0.4

import java.io.File;
import java.util.HashMap;

import org.simpleframework.xml.ElementMap;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

public class MyMap<T>
{
  @ElementMap
  private HashMap<T, String> map = new HashMap<T, String>();

  public static void main(String[] args)
  {
    try
    {
      serialize(new MyMap<String>());
      System.out.println("done");
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }

  private static void serialize(Object data) throws Exception
  {
    Serializer serializer = new Persister();
    File xmlFile = new File("test.xml");
    serializer.write(data, xmlFile);
  }
}


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UBS Limited is a company registered in England & Wales under company
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UBS AG (London Branch) is registered as a branch of a foreign company
under number BR004507, whose registered office is at
1 Finsbury Avenue, London, EC2M 2PP, United Kingdom.

UBS Clearing and Execution Services Limited is a company registered
in England & Wales under company number 03123037, whose registered
office is at 1 Finsbury Avenue, London, EC2M 2PP, United Kingdom.

[Simple-support] can't serialize an object which uses a parametrized hashmap

[Joe <fis...@ya...>]

Hi,

the following code throws an exception.
But if i replace T by String, serialization is no problem.

Why the parametrized version doesn't work?

Version: 2.0.4

import java.io.File;
import java.util.HashMap;

import org.simpleframework.xml.ElementMap;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

public class MyMap<T>
{
  @ElementMap
  private HashMap<T, String> map = new HashMap<T, String>();

  public static void main(String[] args)
  {
    try
    {
      serialize(new MyMap<String>());
      System.out.println("done");
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }

  private static void serialize(Object data) throws Exception
  {
    Serializer serializer = new Persister();
    File xmlFile = new File("test.xml");
    serializer.write(data, xmlFile);
  }
}

Re: [Simple-support] xsi:schemaLocation

[<Nia...@ub...>]

Hi,

Just create the attribute with an @Attribute annotation. For example

@Attribute(required=false)
private String schemaLocation; 

In this way the attribute will match your annotated field and there will be no exception. Also, if you do not like this, you can implement a org.simpleframework.xml.core.Strategy to remove the "schemaLocation" attribute.

Niall

-----Original Message-----
From: Fabian Kürten [mailto:fab...@we...] 
Sent: 31 March 2009 20:36
To: sim...@li...
Subject: [Simple-support] xsi:schemaLocation

Hi List,


I have an XML file, similiar to this snippet:

<root xmlns="http://www.domain.org/namespace"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.domain.org/namespace root.xsd">

When i try to deserialize it, I get the following exception:

org.simpleframework.xml.core.AttributeException: Attribute 'schemaLocation' does not exist at line -1
	at org.simpleframework.xml.core.Composite.readAttribute(Composite.java:424)
	[...]

Is there a way to ignore this?

Thanks, Fabian


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message is provided for informational purposes and should not be 
construed as a solicitation or offer to buy or sell any securities 
or related financial instruments.

UBS Limited is a company registered in England & Wales under company
number 2035362, whose registered office is at 1 Finsbury Avenue,
London, EC2M 2PP, United Kingdom.

UBS AG (London Branch) is registered as a branch of a foreign company
under number BR004507, whose registered office is at
1 Finsbury Avenue, London, EC2M 2PP, United Kingdom.

UBS Clearing and Execution Services Limited is a company registered
in England & Wales under company number 03123037, whose registered
office is at 1 Finsbury Avenue, London, EC2M 2PP, United Kingdom.

[Simple-support] xsi:schemaLocation

[Fabian K. <fab...@we...>]

Hi List,


I have an XML file, similiar to this snippet:

<root xmlns="http://www.domain.org/namespace"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.domain.org/namespace root.xsd">

When i try to deserialize it, I get the following exception:

org.simpleframework.xml.core.AttributeException: Attribute 
'schemaLocation' does not exist at line -1
	at org.simpleframework.xml.core.Composite.readAttribute(Composite.java:424)
	[...]

Is there a way to ignore this?

Thanks, Fabian

[Simple-support] Tutorial page in Opera browser

[Timo R. <cr...@ol...>]

Hello Niall,

any info on when you have time to fix the tutorial page for the Opera
browser (see my last mail in the mailinglist)?


Thanks a lot


Best regards,
Timo

[Simple-support] de/serializing class delegating read-only property.

[N. N. <nju...@gm...>]

how would one use SimpleXML to serialize/deserialize the following
prototypical example class?  the basic premise is that the class delegates
some read-only properties to a subordinate class.  the subordinate class, in
turn, must be initialized on instantiation (because its properties are
read-only).

i'd like to have the XML look something like <delegateProperty
propertyA="100" propertyB="200"/> (or as attributes) but can't figure out
how to appropriately annotate with SimpleXML.  thanks for any help.

public class DelegatedProperty
{
    public DelegatedProperty(int propertyA, int propertyB)
    {
        this.delegate = new Delegate(propertyA, propertyB);
    }

    public int getPropertyA()
    {
        return this.delegate.getA();
    }

    public int getPropertyB()
    {
        return this.delegate.getB();
    }

    private Delegate delegate = null;
}

Re: [Simple-support] Strange Nullpointer for ElementMap with generics?

[Niall G. <gal...@ya...>]

Hi,

Generics are not reified in Java, this means that the type is erased after compilation. So when you reflectively attempt to acquire the type there is a null pointer exception.

The is no workaround for this, its a limitation of the language unfortunately.

Niall

--- On Sun, 3/29/09, Fabian Kürten <fab...@we...> wrote:

> From: Fabian Kürten <fab...@we...>
> Subject: [Simple-support] Strange Nullpointer for ElementMap with generics?
> To: sim...@li...
> Date: Sunday, March 29, 2009, 5:28 AM
> Hi Group
> 
> I just tried this:
> 
> @Root
> public class MapTest<K, V> {
> 
>     @ElementMap
>     public HashMap<K, V> data;
> 
>     public MapTest() {
>         this.data = new
> HashMap<K, V>();
>     }
> 
>     public static void main(String[] args)
> throws Exception {
>         MapTest<String,
> Integer> mt = new MapTest<String, Integer>();
>         mt.data.put("Eins",
> 1);
>         mt.data.put("Vier",
> 4);
>         mt.data.put("Drei",
> 3);
>         Serializer serializer
> = new Persister();
>         serializer.write(mt,
> System.out);
>     }
> }
> 
> Which failed like:
> Exception in thread "main" java.lang.NullPointerException
>     at
> org.simpleframework.xml.core.Signature.getEntry(Signature.java:102)
>     at 
> org.simpleframework.xml.core.ElementMapLabel.getEntry(ElementMapLabel.java:196)
>     at
> org.simpleframework.xml.core.Signature.getName(Signature.java:196)
>     at 
> org.simpleframework.xml.core.ElementMapLabel.getName(ElementMapLabel.java:214)
>     at
> org.simpleframework.xml.core.CacheLabel.<init>(CacheLabel.java:119)
>     at 
> org.simpleframework.xml.core.LabelFactory.getInstance(LabelFactory.java:67)
>     at
> org.simpleframework.xml.core.Scanner.process(Scanner.java:606)
>     at
> org.simpleframework.xml.core.Scanner.scan(Scanner.java:539)
>     at
> org.simpleframework.xml.core.Scanner.field(Scanner.java:498)
>     at
> org.simpleframework.xml.core.Scanner.scan(Scanner.java:348)
>     at
> org.simpleframework.xml.core.Scanner.<init>(Scanner.java:98)
>     at 
> org.simpleframework.xml.core.ScannerFactory.getInstance(ScannerFactory.java:67)
>     at
> org.simpleframework.xml.core.Support.getScanner(Support.java:161)
>     at
> org.simpleframework.xml.core.Support.getName(Support.java:223)
>     at
> org.simpleframework.xml.core.Source.getName(Source.java:196)
>     at
> org.simpleframework.xml.core.Traverser.getName(Traverser.java:262)
>     at
> org.simpleframework.xml.core.Traverser.write(Traverser.java:185)
>     at
> org.simpleframework.xml.core.Traverser.write(Traverser.java:168)
>     at
> org.simpleframework.xml.core.Persister.write(Persister.java:921)
>     at
> org.simpleframework.xml.core.Persister.write(Persister.java:903)
>     at
> org.simpleframework.xml.core.Persister.write(Persister.java:884)
>     at
> org.simpleframework.xml.core.Persister.write(Persister.java:1000)
>     at
> org.simpleframework.xml.core.Persister.write(Persister.java:982)
>     at
> org.simpleframework.xml.core.Persister.write(Persister.java:963)
>     at MapTest.main(MapTest.java:25)
> 
> I am quite sure the reason are the generics... anyone knows
> more about this?
> 
> Fabian
> 
> ------------------------------------------------------------------------------
> _______________________________________________
> Simple-support mailing list
> Sim...@li...
> https://lists.sourceforge.net/lists/listinfo/simple-support
> 


      

[Simple-support] Strange Nullpointer for ElementMap with generics?

[Fabian K. <fab...@we...>]

Hi Group

I just tried this:

@Root
public class MapTest<K, V> {

	@ElementMap
	public HashMap<K, V> data;

	public MapTest() {
		this.data = new HashMap<K, V>();
	}

	public static void main(String[] args) throws Exception {
		MapTest<String, Integer> mt = new MapTest<String, Integer>();
		mt.data.put("Eins", 1);
		mt.data.put("Vier", 4);
		mt.data.put("Drei", 3);
		Serializer serializer = new Persister();
		serializer.write(mt, System.out);
	}
}

Which failed like:
Exception in thread "main" java.lang.NullPointerException
	at org.simpleframework.xml.core.Signature.getEntry(Signature.java:102)
	at 
org.simpleframework.xml.core.ElementMapLabel.getEntry(ElementMapLabel.java:196)
	at org.simpleframework.xml.core.Signature.getName(Signature.java:196)
	at 
org.simpleframework.xml.core.ElementMapLabel.getName(ElementMapLabel.java:214)
	at org.simpleframework.xml.core.CacheLabel.<init>(CacheLabel.java:119)
	at 
org.simpleframework.xml.core.LabelFactory.getInstance(LabelFactory.java:67)
	at org.simpleframework.xml.core.Scanner.process(Scanner.java:606)
	at org.simpleframework.xml.core.Scanner.scan(Scanner.java:539)
	at org.simpleframework.xml.core.Scanner.field(Scanner.java:498)
	at org.simpleframework.xml.core.Scanner.scan(Scanner.java:348)
	at org.simpleframework.xml.core.Scanner.<init>(Scanner.java:98)
	at 
org.simpleframework.xml.core.ScannerFactory.getInstance(ScannerFactory.java:67)
	at org.simpleframework.xml.core.Support.getScanner(Support.java:161)
	at org.simpleframework.xml.core.Support.getName(Support.java:223)
	at org.simpleframework.xml.core.Source.getName(Source.java:196)
	at org.simpleframework.xml.core.Traverser.getName(Traverser.java:262)
	at org.simpleframework.xml.core.Traverser.write(Traverser.java:185)
	at org.simpleframework.xml.core.Traverser.write(Traverser.java:168)
	at org.simpleframework.xml.core.Persister.write(Persister.java:921)
	at org.simpleframework.xml.core.Persister.write(Persister.java:903)
	at org.simpleframework.xml.core.Persister.write(Persister.java:884)
	at org.simpleframework.xml.core.Persister.write(Persister.java:1000)
	at org.simpleframework.xml.core.Persister.write(Persister.java:982)
	at org.simpleframework.xml.core.Persister.write(Persister.java:963)
	at MapTest.main(MapTest.java:25)

I am quite sure the reason are the generics... anyone knows more about this?

Fabian

Re: [Simple-support] add forward references

[Niall G. <gal...@ya...>]

Hi

This is currently not possible with the CycleStrategy. It would require some changes to how the deserialization and serialization process is performed. 

Niall

--- On Fri, 3/27/09, Nuno Fachada <nfa...@is...> wrote:

> From: Nuno Fachada <nfa...@is...>
> Subject: [Simple-support]  add forward references
> To: sim...@li...
> Date: Friday, March 27, 2009, 11:24 AM
> Hi,
> 
> Would it be possible for Simple to support forward
> references, such as:
> 
> <model>
>    <object1 id="obj1">
>        <x>4</x>
>        <y>3</y>
>    </object1>
>    <object2 reference="obj1" />
>    <object3 reference="obj4" />
>    <object4 id="obj4">
>        <x>2</x>
>        <y>1</y>
>    </object4>
> </model>
> 
> Using CyclicStrategy Simple allows that object2 references
> object1; 
> however it's not currently possible for object3 to
> reference object4.
> Could this feature be implemented? Instead of firing the
> exception when 
> the reference is not found, Simple could parse the all of
> the XML and 
> then resolve references; then, if an invalid reference is
> found, the 
> exception would be thrown.
> 
> Thank you,
> 
> Nuno Fachada
> ISR - IST - Portugal
> 
> 
> 
> ------------------------------------------------------------------------------
> _______________________________________________
> Simple-support mailing list
> Sim...@li...
> https://lists.sourceforge.net/lists/listinfo/simple-support
> 


      

[Simple-support] Fwd: Allowing polymorphic collections serialization to match original definitions

[Quirino Z. <qu...@la...>]

---------- Forwarded message ----------
From: Quirino Zagarese <the...@gm...>
Date: 2009/3/28
Subject: Allowing polymorphic collections serialization to match original
definitions
To: sim...@li...


Hi,
I'm trying to serialize a collection that may contain different types.
Now, simple resolves polymorphism using the class attribute.
I would be great if I could do something like this:

@Root
public class AZ{

@ElementList(inline=true,useroot=true)
private Collection<Letter> elements;
.....

public az(){
elements = new  ArrayList();
// A and B implement Letter
elements.add(new A());
elements.add(new B());
.....
}

}

and obtain:

<AZ>
<A/>
<B/>
.....
</AZ>

instead of:

<AZ>
<Letter class="A"/>
<Letter class="B"/>
....
</AZ>

This could be very useful for all the tools that have to generate XUL like
XML.
In those cases you have an element that may contain from 0 to N elements and
you don't know a priori the type of each element(and of course you have to
serialize it with its name, not with the <interfacename
class="realclassname"/> technique).
Any thoughts?
Regards



-- 
Quirino Zagarese

LaszloItalia Founder (www.laszloitalia.org)
Software Development Manager - Galilaeus s.r.l.



-- 
Quirino Zagarese

LaszloItalia Founder (www.laszloitalia.org)
Software Development Manager - Galilaeus s.r.l.

[Simple-support] add forward references

[Nuno F. <nfa...@is...>]

Hi,

Would it be possible for Simple to support forward references, such as:

<model>
    <object1 id="obj1">
        <x>4</x>
        <y>3</y>
    </object1>
    <object2 reference="obj1" />
    <object3 reference="obj4" />
    <object4 id="obj4">
        <x>2</x>
        <y>1</y>
    </object4>
</model>

Using CyclicStrategy Simple allows that object2 references object1; 
however it's not currently possible for object3 to reference object4.
Could this feature be implemented? Instead of firing the exception when 
the reference is not found, Simple could parse the all of the XML and 
then resolve references; then, if an invalid reference is found, the 
exception would be thrown.

Thank you,

Nuno Fachada
ISR - IST - Portugal