Re: [castor-dev] saving a java-project

[Jens Saade]

Again, I can only guess without code.
//Jens
Katja wrote:

Hi,

I found my mistake. Any class needs a nullary constructor. I didn't have
it.
This mistake I'm getting now:
org.xml.sax.SAXException: unable to instantiate a new type of:
GUI.MainFrame$ImageAndPositionData{file: [not available]; line: 2;
column: 341}
Could it be because ImageAndPositionData is a inner class??
Cheers,
Katja
-----Urspr�ngliche Nachricht-----
Von: Jens Saade [mailto:[EMAIL PROTECTED] 
Gesendet: Donnerstag, 4. M�rz 2004 10:12
An: [EMAIL PROTECTED]
Betreff: Re: [castor-dev] saving a java-project



Hi Katja,

comments inline ...

Katja wrote:

 

Hello Jens,
Thank you for answering my 'beginner questions'.
I already thought that I cannot write to object to one file. I correct 
it by creating new class SaveData with two attributes -the two objects,
   

 

I want to save.  SaveData dataToSave=new 
SaveData(workingDemosProject,mapPositions);
                  writer = new FileWriter(fileProject1);
                  
org.exolab.castor.xml.Marshaller.marshal(dataToSave,
writer);
//reading:
SaveData
savedData=(SaveData)org.exolab.castor.xml.Unmarshaller.unmarshal(SaveDa
   

t
 

a.class,
             new FileReader(fileOpen));
This is the new xml-file:
<?xml version="1.0" encoding="UTF-8" ?> 
- <save-data>
	- <proj>
	  <objectkind-name>Entity</objectkind-name> 
		- <entity-list xsi:type="java:Core.DemosEntity"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
	  <objectkind-name>Entity</objectkind-name> 
	</entity-list>
	</proj>
<graphic-data xsi:type="java:GUI.MainFrame$ImageAndPositionData"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; /> 
<graphic-data xsi:type="java:GUI.MainFrame$ImageAndPositionData"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; /> 
</save-data>

This is the new exception, I'm getting while reading.
org.xml.sax.SAXException: unable to instantiate GUI.SaveData;
java.lang.InstantiationException: GUI.SaveData{file: [not available];
line: 2; column: 12}
What could cause the problem that GUI.SaveData cannot be instntiated? 
The class is public and serializable.

   

I can only guess without seeing the code. Please provide the relevant 
code (or the parts of it).

 

Do I really have to make any Attribute public, If I want to save 
it????It doesn't make any sense to me.

   

You should not access properties of an object from outside the object 
directly, but write getter and setter methods for each variable. E.g.
private int testInt;

public int getTestInt(){
 return testInt;
}
public void setTestInt(){
  this.testInt = testInt;
}
Castor will you getters and setter if available (afaik).

 

Maybe you can tell me which documentation I should read that I can 
solve more problems by myself. I thought I read the most important 
documentation of Castor but maybe it wasn't enought.

Cheers,
Katja
-----Urspr�ngliche Nachricht-----
Von: Jens Saade [mailto:[EMAIL PROTECTED]
Gesendet: Mittwoch, 3. M�rz 2004 15:22
An: [EMAIL PROTECTED]
Betreff: Re: [castor-dev] saving a java-project


Katja,
the XML file is not valid if its one file. You are marshalling objects
via the same writer into the same file, this results in two independant
   

 

xml-structures appended in one file:

-- file --
<?xml version="1.0" encoding="UTF-8"?>
<demos-project>
  <objectkind-name>Entity</objectkind-name>
  <entity-list xsi:type="java:Core.DemosEntity"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
      <objectkind-name>Entity</objectkind-name>
  </entity-list>
</demos-project>
<?xml version="1.0" encoding="UTF-8"?>
<hash-map empty="false"/>
-- file --
... which is not valid XML. You either have to marshal into two
different files or implement a root object that encapsulates both the 
DemosProject.class and the HashMap.
Furthermore you can't read from a mixed invalid XML file into two 
different objects. That's why you get the

org.xml.sax.SAXException: Parsing Error : The processing instruction 
target matching "[xX][mM][lL]" is not allowed.

Cheers,
Jens


Katja wrote:



   

Well, let's try it step by step to solve my problems.
This is how I write to the xml-file:
	 writer = new FileWriter(fileProject1);	
	 org.exolab.castor.xml.Marshaller.marshal(workingDemosProject,
writer);
	 org.exolab.castor.xml.Marshaller.marshal(mapPositions, writer);
  

     

This

   

is how I read from the xml-file:
	res.project=
(DemosProject)org.exolab.castor.xml.Unmarshaller.unmarshal(DemosProjec
     

t
 

.
class,
            new FileReader(fileOpen));
        
res.graphicData=(HashMap)org.exolab.castor.xml.Unmarshaller.unmarshal(
H
a
shMap.class,
            new FileReader(fileOpen));
The saving works without exception but the xml-file doesn't look ok (I
think). <?xml version="1.0" encoding="UTF-8"?>
<demos-project><objectkind-name>Entity</objectkind-name><entity-list
xsi:type="java:Core.DemosEntity"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";><objectkind-name
     

  

     

E

   

ntity</objectkind-name></entity-list></demos-project><?xml
  

     

version="1.0"

   

encoding="UTF-8"?>
<hash-map empty="false"/>
When I read, I get following exception:
org.xml.sax.SAXException: Parsing Error : The processing instruction
target matching "[xX][mM][lL]" is not allowed. Line : 2 Column : 233 
{file: [not available]; line: 2; column: 233}

Here the structure of the two objects I want to save:
1. workingDemosProject is of Type DemosProject, ist superclass
DemosEntity(a) and has one Attribute of type DemosEntityList(b)
DemosEntity(a) has three Attributes. Their type is a
self-implemented class that extends a ArrayList .
DemosEntityList(b) is self-implemented class that extends a 
ArrayList,too. 2. mapPositions is a Hashmap

I hope these are good informations that you can help me.

Cheers,
Katja


-----Urspr�ngliche Nachricht-----
Von: Jens Saade [mailto:[EMAIL PROTECTED]
Gesendet: Mittwoch, 3. M�rz 2004 11:19
An: [EMAIL PROTECTED]
Betreff: Re: [castor-dev] saving a java-project


Hi Katja,

people on the mailing list can better help you on specific problems 
you encounter. The best thing you can do is to describe each problem 
with reference to your code (java/xml/xsd, etc) and develop it 
step-by-step. Getting used to castor may take some time but in the end
     

 

this will pay off. I'm using castor for lots of projects since a while
     

 

(JDO and XML) and found the help on this list very useful. The more 
specific the questions you ask the more answers you'll get =)

Jens

Katja wrote:



  

     

Hi,
I'm trying to save my java-project to a xml-file and back. However my
       

 

objects within the project are structured very complicated. I have 
sometime six level of superclasses or want to save a HashMap that 
contains not basic-objects. I thought castor can do this but I'm 
experiencing a lot of problems. Simple testing projects worked fine 
with Castor. Can someone give me advices what important is to watch
    

       

for

   

 

    

       

  

     

or what kind of objects I cannot save? Or maybe Castor is not the
right
 

    

       

  

     

thing to use. I had found another class library that work very good
but
 

    

       

  

     

wasn't open-source.
Cheers,
Katja


 

    

       

  

     



   

 

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Jens Saade - Application Developer - Business Center Industry
Maarweg 149-161, 50825 Cologne - Germany
Phone: +49 (0)221-770-1794 - Fax: +49 (0)221-770 1005
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