gmane.comp.java.xstream.user

XStream ConversionException the second time I parse an XML file

Gonzalo Rodríguez Píriz — 2012-05-24T10:13:05

Hi everyone,

I'm trying to read a TreeMap from an XML file using XStream (I previously
created the XML file using XStream too) in my Android application.

I simply do this in a static method of a class:

File f = new File(Environment.getExternalStorageDirectory(), "map.xml");

XStream xStream = new XStream(new DomDriver());

< at >SuppressWarnings("unchecked")
TreeMap<String,Object> map = (TreeMap<String,Object>) xStream.fromXML(f);

and then I use the values from the TreeMap with no problems... the first
time.

The thing is, if I invoke the method for a second time, it doesn't matter
if I do it just after the first execution or after a while, I get this:

05-24 08:33:53.404: E/AndroidRuntime(15543): FATAL EXCEPTION: main
05-24 08:33:53.404: E/AndroidRuntime(15543):
com.thoughtworks.xstream.converters.ConversionException: null : null
05-24 08:33:53.404: E/AndroidRuntime(15543): ---- Debugging information ----
05-24 08:33:53.404: E/AndroidRuntime(15543): cause-exception     :
java.lang.NullPointerException
05-24

custom Map converter with XStreamImplicit anotation

Martin Minka — 2012-05-23T18:55:36

I would like to produce from a HashMap following XML:
<a id="map_key">map_value</a>

I tried:
< at >XStreamImplicit(keyFieldName = "a")
< at >XStreamConverter(MyMapConverter.class)
HashMap<String, String> map = new HashMap<String, String>();

But this combination never enters MyMapConverter.

Is there a way to achieve this ?

Thank you.

Getting CannotResolveClassException

Anshuma Ashok Goyal — 2012-05-23T12:13:54

Hi Guys,

I am using com.thoughtworks.xstream v1.3.1.  And trying to load XML file to java object.

While doing so getting CannotResolveClassException error for the class CategoryRuleMap which is present at the required location.

This functionality was working with Sonar plugin api - 1.10. I have upgraded Sonar plugin api to 3.0 and this has stopped working. Any clue what could be the issue.

Below is the code snippet I have:

        InputStream input = getClass().getResourceAsStream(CATEGORY_MAP_FILE);
    categoryRuleMap = new CategoryRuleMap();

    XStream xstream = new XStream();
    xstream.alias("CategoryRuleMap", CategoryRuleMap.class);
    xstream.alias("category", CategoryMap.class);
    xstream.aliasAttribute(CategoryMap.class, "name", "name");
    xstream.alias("rule", String.class);
    xstream.addImplicitCollection(CategoryRuleMap.class, "categories");

    xstream.fromXML(input, categoryRuleMap);

Error trace:

 [INFO] Trace
com.thoughtworks.xstream.mapper.CannotResolveClassException: abc.de

Jettison upgrade changes json

Andreas Sachs — 2012-05-13T00:41:28

Hi,
after upgrading xstream from 1.3.1 to 1.4.2 and jettison 1.0.1 to 1.2 (or 1.3.1) the generated json string changed. I could also change the javascript processing of the json string, but the new version looks strange to me.

I try to serialize the following object tree:

class userlist {
private List<User> users;
}

class User {
private name;
private vorname;
}


After the upgrade the json string contains collections at two different levels.

Old
{"userlist":{"users":{"user":[{"name":"x","vorname":"y"},{"name":"x","vorname":"y"}]}}}

New
{"userlist":{"users":[{"user":[{"name":"x","vorname":"y"},{"name":"x","vorname":"y"}]}]}}

Is this ok and i should change my code? or is this a bug?

Thanks
Andi



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Customizing JSON Map serialization

Pablo Pazos — 2012-05-11T00:58:15

Hi,

I'm trying to serialize to JSON an object that has a HashMap field, the
output is something like this:

"originalAuthor": [
            [
              "organisation",
              "Ocean Informatics"
            ],
            [
              "name",
              "Chunlan Ma"
            ],
            [
              "date",
              "16/11/2006"
            ]
          ]

But I expected something more like a JSON object:

"originalAuthor": {
              "organisation": "Ocean Informatics",
              "name": "Chunlan Ma",
              "date": "16/11/2006"
          }

This is a simple example, field values can be complex objects.


Is there some way of generating a structure like this for Map Java objects?

Thanks a lot.

configuring HibernateProxyConverter

Michael Teixeira — 2012-05-08T19:41:20

As part of going from xstream 1.3.1 to xstream 1.4.2, I'm trying to make
use of HibernateProxyConverter.

So I've changed the xstream configuration from, in 1.3.1:

         this.xstream = new XStream();
        xstream.registerConverter(new
JavaBeanConverter(xstream.getMapper()), XStream.PRIORITY_VERY_LOW);
        Mapper mapper = xstream.getMapper();
        xstream.registerConverter(new HibernateCollectionConverter(mapper));
        xstream.addDefaultImplementation(java.util.ArrayList.class,
org.hibernate.collection.PersistentList.class);
        xstream.addDefaultImplementation(java.util.HashMap.class,
org.hibernate.collection.PersistentMap.class);
        xstream.addDefaultImplementation(java.util.HashSet.class,
org.hibernate.collection.PersistentSet.class);
        xstream.addDefaultImplementation(java.util.ArrayList.class,
org.hibernate.collection.PersistentBag.class);
        xstream.alias("java.util.ArrayList",
org.hibernate.collection.PersistentBag.class);

to, in 1.4.2:

        xstream = new XStr

How do I get the coorect value for XML special characters

Ajaya Sahoo — 2012-05-04T03:34:25

Hi,
 
I have an element with the following value ( <condition> a > b </condition> ). When I put the value in the object and use Xstream.toXML the value comes <condition> a &gt; b</condition>. How to get back the exact string with > character?
 
Thanks,
ajaya

deserializing json with numbered object names

Walton, Lynn — 2012-04-30T19:39:18

Hello all,

I'm hoping to use XStream with the JettisonMappedXmlDriver to deserialize some 3rd party json output.

The json output includes numbers  as object names so in my example below propertyC actually has 3 nested objects but uses a number "1", "2", or "3" as the object name.  In my real world the json usually contains between 100 and 200 of these (it varies).

For instance:

{ "root" : { "propertyA " : "valueA",
      "propertyB" : "valueB",
      "propertyC" : { "1" : { "propertyC1" : "propertyC1_1_Value",
              "propertyC2" : "propertyC2_1_Value",
              "propertyC3" : "propertyC3_1_Value"
            },
          "2" : { "propertyC1" : "propertyC1_2_Value",
              "propertyC2" : "propertyC2_2_Value",
              "propertyC3" : "propertyC3_2_Value"
            },
          "3" : { "propertyC1" : "propertyC1_3_Value",
              "propertyC2" : "propertyC2_3_Value",
              "propertyC3" : "propertyC3_3_Value"
            }
        },
      "propertyD" : "valueD"
    }

get rid of class="list" for more than one contained List interface fields

Amit Basu — 2012-04-29T19:31:56

I have a container class as follows:
class FruitBasket { List<Apple> apples; List<Orange> oranges;}
I have added xstream.registerConverter(new HibernatePersistentCollectionConverter(xstream.getMapper()));I have also setup alias apple for com.myorg.Apple and com.myorg.Orange.
The marshalled FruitBasket object has:
<apples class="list">  <apple>....</apple>  <apple>....</apple></apples><oranges class="list">  <orange>....</orange>  <orange>....</orange></oranges>
In order to get rid of the class="list" in apples and oranges, I added xstream.alias("apples", List.class, PersistentList.class);xstream.alias("oranges", List.class, PersistentList.class); The objects are marshalled all right, without the class= attributes.
But the client unmarshals, and fails with com.thoughtworks.xstream.mapper.CannotResolveClassException: oranges 
If I change the order of aliasing with oranges first instead of apples:xstream.alias("oranges", List.class, PersistentList.class);xstream.alias("apples", List.class, PersistentList.class

Class with an interface field saved as an id

Jirka Hana — 2012-04-22T21:10:02

Hello,

 I am new to XStream, I got 95% of my task done in nearly no time, but now
I am stuck with trying to serialize the following class:

class MyClass {
    private String name;
    private Pattern pattern;
    // few more fields

    private ColumnPrinter<?> printer;
}

The printer can be an instance of any subclass (possibly anonymous) of the
ColumnPrinter interface. All must implement the getId() method and all are
registered in a global registry (by calling the method ColumnPrinter<?>
getPrinter(String id))

I would like to save all the fields the usual way, but for the printer, I
would like to save its id only (say as <printer>12</printer>). Then when
deserializing the id should be read, and the proper instance should be
looked up in the global registry.

I am not sure how to do that. Can anybody help?

Thanks
Jirka

IS XStream also Thread Safe while configured through Spring OXM

satya — 2012-04-18T16:34:53

Hi

http://xstream.codehaus.org/faq.html - says XStream is thread safe -
"Once the XStream instance has been created and configured, it may be
shared across multiple threads "

    XStream xstream = new XStream();
    Person person = (Person)xstream.fromXML(xml);

 So above piece of code should work fine in multi-threaded environment :


Coming to the Point -
I use Spring OXM ,where i can configure Marshaller/Unmarshaller in any of
the following ways :

<bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
    <property name="classesToBeBound"> ....
                             OR
<bean id="xstreamMarshaller"
class="*org.springframework.oxm.xstream.XStreamMarshaller*">
     <property name="aliases"> ......

   import *org.springframework.oxm.Marshaller*;
   import *org.springframework.oxm.Unmarshaller*;
   public class Application {
   private *Marshaller *marshaller;
   private *Unmarshaller *unmarshaller;

IS XStream also Thread Safe while configured through Spring-OXM(as above) ?

Class cast exception while instantiate converter

Mahesh — 2012-04-17T19:32:05

Hi

I am getting the below exception while converting XML to object. I am using 
Xstream 1.4.1 and JDK 1.6.

It's working fine in one websphere server (RAD 7.5 and websphere 7.0) and it's 
not working in another websphere server 7.0.

Please tell me the reason, why i am getting the below exception.

com.thoughtworks.xstream.XStream$InitializationException: Could not instantiate 
converter : com.thoughtworks.xstream.converters.extended.DurationConverter : 
null
 at com.thoughtworks.xstream.XStream.dynamicallyRegisterConverter
(XStream.java:732)
 at com.thoughtworks.xstream.XStream.setupConverters(XStream.java:696)
 at com.thoughtworks.xstream.XStream.<init>(XStream.java:445)
 at com.thoughtworks.xstream.XStream.<init>(XStream.java:385)
 at com.thoughtworks.xstream.XStream.<init>(XStream.java:342)
... 39 more
Caused by: 
java.lang.reflect.InvocationTargetException
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance
(NativeConstruct

HashMap containing unknown values

nino martinez wael — 2012-04-13T09:23:14

Hi

I am having some difficulties making xstream intrepret the xml that are
being delivered to me.

In short on the java side I want to have a hashmap<string,string>
containing entities inside the xml tag called log, the attributes on info
are wildcard (the sender of the xml can write whatever he wants)

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<HttpInfo>
            <NetCoolLogLevel>0</NetCoolLogLevel>
            <Log>
                         <Info id="1-LI031" status="OK"/>
                         <Info id="2-LI031" status="OK"/>
            </Log>
            <DocLink></DocLink>
            <DocInfo></DocInfo>
</HttpInfo>


This is what I've got:

Initial loading:
http://tinypaste.com/a6819c6c

Java (with annotations) for classes:
http://tinypaste.com/da379770

Current XML(working):
http://tinypaste.com/ecdb3470

Specified XML:
http://tinypaste.com/9aff0b98

XStreamMarshaller does not unproxy at marshalling

Amit Basu — 2012-04-11T02:32:48

I use a org.springframework.http.converter.xml.MarshallingHttpMessageConverter with org.springframework.oxm.xstream.XStreamMarshaller as marshaller/unmarshaller.
With default-lazy=false hibernate-mapping, org.springframework.web.client.RestTemplate.getForObject() works fine.
But with default-lazy = true, some contained objects from the top-level object are org.hibernate.proxy.pojo.javassist.SerializableProxy, which makes the getForObject() fail, with org.hibernate.LazyInitializationException- could not initialize proxy - no Session
Is there a way to get the marshaller to initialize and unproxy as needed, when writing to the stream ?
I want to have the same API calls for REST and non-REST situations (non-REST = local JVM calls that can make further calls with the Hibernate session, to get contents from proxies as needed), and ideally default-lazy = true is preferred for non-REST calls, but then if the same call is used by a REST controller, the marshalling keeps the proxies as is currently.

failure when trying to include xstream in pom.xml file

J.V. — 2012-04-10T07:21:33

I want to put xtream in my maven pom.xml,

But I keep getting an error:

Downloading: 
https://nexus.codehaus.org/content/groups/public/com/thoughtworks/xstream/xtream/1.4.1/xtream-1.4.1.pom
[WARNING] The POM for com.thoughtworks.xstream:xtream:jar:1.4.1 is 
missing, no dependency information available
Downloading: 
https://nexus.codehaus.org/content/groups/public/com/thoughtworks/xstream/xtream/1.4.1/xtream-1.4.1.jar
[INFO] 
------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] 
------------------------------------------------------------------------
[INFO] Total time: 1.398s
[INFO] Finished at: Mon Apr 09 17:13:36 MDT 2012
[INFO] Final Memory: 8M/109M
[INFO] 
------------------------------------------------------------------------

any ideas?

I have the nexus.codehaus.org maven repo configured as a repository and 
the path given above is the address to the .jar.  Are the thoughworks 
xstream poms messed up?

J.V.

ftp port 20 and 21.

Paulo Hess — 2012-03-29T18:33:13

How can I set xstream to use only ports 20 and 21. currently it tries TCP ports
(39622, 64020, 39271, 12492, 44541)... and being blocked.

Please help
Thanks


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XStreamConverter annotation and caching

Benny Kannengiesser — 2012-03-27T14:09:43

Hi,

 I have a question concerning the new feature of the latest release 1.4.2, that now the XStreamConverter annotation takes additional parameters (very good feature and just what I need).

 How does the caching of the converter instances work now?
 Since the parameters are passed on to the constructor of the respective converter, the converters contain state and the caching could become more complicated..
 Or is there no caching any more in these cases?

 Thanks for any information.

Multiple aliases for system attribute

Vitali Nashkevich — 2012-03-22T23:57:58

Hallo,

Assume we have a xml fragment:

**************************************
<condition id="the-first"/>
<condition id="the-second"/>
<condition id="the-third"/>
<if if-ref="the-first" then-ref="the-second" else-ref="the-third"/>
***************************************

Obviously i want here to interpret attributes 'if-ref', 'then-ref' & 
'else-ref' as references to previously defined objects.
XStream.aliasSystemAttribute(...) allows just to redefine system 
attribute but does not allow to define several aliases
for it.

Custom converter does not help too because deserialised values are 
stored in private map
of ReferenceByIdUnmarshaller(AbstractReferenceUnmarshaller) class.

What could be the best solution for the problem?

Thank you in advance,
Vitali Nashkevich




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Confusion getting ISO8601 dates

Bjorn Roche — 2012-03-20T18:53:36

Hey all,

First off, I heart XStream. I just wanted to share a problem I had recently and how I solved it. It seems to me the solution is unintuitive and hard to find. This maybe isn't a bug, but at the very least I think it should be easier to do what I needed to do, or maybe his needs to be a FAQ or something.

So here's my story:

I noticed my dates were not being converted the way I wanted. After much searching I found this: http://jira.codehaus.org/browse/XSTR-116 Ah hah! that's all I need to do!

- first comment: that should be a FAQ or something. ISO8601 dates are pretty widely accepted as standard for XML, right? If they don't work automatically, it should be easy for people to figure out how to make them work, and I think the FAQ is the right place for that.

So I installed Jodatime, registered my converter and thought I was done with it. But I wasn't. Unbeknownst to me, my persistence engine was converting my java.util.date objects to java.sql.timestamp objects.... sometimes. One solution, of cours

Eliminate class fields during field determination

Eric Lentz — 2012-03-20T14:43:30

So I have a class, let's call it X, that has a Map. That Map contains the
same reference to X.

I want it to ignore the Map so that it never explodes it while it is
finding the fields it needs to consider for serialization. Is there a way
to do this?

As near as I can tell, XStream considers all of the fields in a class, even
if you omit it from the output. This came from seeing those fields being
considered in AbstractReflectionConverter while stepping through the code.
Further, the omit appears in the code to only be considered during output.
Should I implement my own converter?

By the way, this problem yields an OutOfMemoryError due to non-stop
recursion. I'm using version 1.2.2 of XStream.

Serializer json with generics

Atienzar Navarro, Marcial — 2012-03-20T08:12:36

Hi,
    
    I've post this issue: https://jira.codehaus.org/browse/XSTR-696

    But I don't know if this is an issue or something that I'm doing wrong. I think that it is an issue, and for that I've create the jira issue.

    I've a generic pojo, ResulBean<E extends Serializable> that has a property, E bean. When E is an ArrayList<GnNode> the output is something like this:

    

{"< at >id": "1","bean": 
{"< at >class": "list","< at >id": "2",
"org.kyrian.entity.gnomo.GnNode": {"< at >id": "3","nodeId": 1,"nodeTitle": "nodo 1"},
"org.kyrian.entity.gnomo.GnNode": {"< at >id": "4","nodeId": 2,"nodeTitle": "nodo 2"}
}
}



    But I think the output must be something like this:


            bean:[                    

 {"< at >id": "3","nodeId": 1,"nodeTitle": "nodo 1"},                  

{"< at >id": "4","nodeId": 2,"nodeTitle": "nodo 2"}
            ]


    I'm doing something wrong?

    Lot of thanks,

        Marcial