Details
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Type:
Bug
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Status:
Closed
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Priority:
Major
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Resolution: Incomplete
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Affects Version/s: 1.2.2
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Fix Version/s: None
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Component/s: Annotations, Converters
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Labels:None
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JDK version and platform:JDK 1.6 Ubuntu 7.10 Tomcat 6.0 Toplink with JPA
Description
Hello,
Actually im using a JPA specification and is required to serialize these objects to JSON notation (View).
When i try to serialize a object to JSON in the middle of the transaction a ClassCastException is throw.
The context :
First my Entity class
@Entity
public class CatalogoDeProdutos implements java.io.Serializable {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@XStreamAlias("idCatalogo")
private Long idCatalogo;
@Column
@XStreamAlias("descricao")
private String descricao;
@OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
private List<Produto> produtos;
@XStreamAlias("tipo")
@Enumerated(EnumType.STRING)
private TipoDoCatalogo tipo;
gets sets ......
...
CatalogoDeProdutos cp = new CatalogoDeProdutos();
aa = JSONSerializationHelper.getJSONFromObject("a", CatalogoDeProdutos.class, cp.clone());
System.out.print("Entity class with annotation"+aa.toString());
....
public static JSONObject getJSONFromObject(String alias,Class c,Object o) throws JSONException, ClassNotFoundException
{ xstream= new XStream(new JettisonMappedXmlDriver()); xstream.alias(alias, c.getClass()); String jr = xstream.toXML(c.cast(o)); JSONObject js = new JSONObject(jr); xstream = null; jr = null; return js; }Work's fine out of the transaction and results
Entity class with annotation {"net.cjb.malacma.nemesis2web.model.CatalogoDeProdutos":{"idCatalogo":"-1","produtos":"","tipo":"CATALOGO_VENDAS"}}
then....
in the middle of the transaction i've cloned the object to the serialization and the folllowing exception is throw.....
java.lang.ClassCastException: org.codehaus.jettison.json.JSONArray
cannot be cast to org.codehaus.jettison.json.JSONObject
org.codehaus.jettison.mapped.MappedXMLStreamWriter.writeAttribute(MappedXMLStreamWriter.java:93)
org.codehaus.jettison.mapped.MappedXMLStreamWriter.writeAttribute
(MappedXMLStreamWriter.java:130)
org.codehaus.jettison.mapped.MappedXMLStreamWriter.writeAttribute(MappedXMLStreamWriter.java:134)
com.thoughtworks.xstream.io.xml.StaxWriter.addAttribute(StaxWriter.java:86)
com.thoughtworks.xstream.io.WriterWrapper.addAttribute
(WriterWrapper.java:30)
com.thoughtworks.xstream.converters.reflection.SerializableConverter$1.defaultWriteObject(SerializableConverter.java:146)
com.thoughtworks.xstream.converters.reflection.SerializableConverter.doMarshal
(SerializableConverter.java:201)
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:43)
com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert
(AbstractReferenceMarshaller.java:55)
com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:50)
com.thoughtworks.xstream.annotations.AnnotationReflectionConverter.marshallField(AnnotationReflectionConverter.java
:46)
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:112)
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.visit
(AbstractReflectionConverter.java:88)
com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:117)
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal
(AbstractReflectionConverter.java:73)
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:43)
com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert
(AbstractReferenceMarshaller.java:55)
com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:50)
com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:73)
com.thoughtworks.xstream.core.ReferenceByXPathMarshallingStrategy.marshal
(ReferenceByXPathMarshallingStrategy.java:34)
com.thoughtworks.xstream.XStream.marshal(XStream.java:765)
com.thoughtworks.xstream.XStream.marshal(XStream.java:754)
com.thoughtworks.xstream.XStream.toXML(XStream.java
:735)
com.thoughtworks.xstream.XStream.toXML(XStream.java:725)
net.cjb.malacma.nemesis2web.helper.JSONSerializationHelper.getJSONFromObject(JSONSerializationHelper.java:37)
net.cjb.malacma.nemesis2web.bo.ControleDeProduto.findCatalogoFull
(ControleDeProduto.java:65)
net.cjb.malacma.nemesis2web.facade.MDIFacadeSistema.findCatalogoFull(MDIFacadeSistema.java:878)
net.cjb.malacma.nemesis2web.mvc.control.ProdutoController.handleRequest(ProdutoController.java
:41)
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:819)
org.springframework.web.servlet.DispatcherServlet.doService
(DispatcherServlet.java:754)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:399)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:354)
javax.servlet.http.HttpServlet.service
(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
Any ideia? Thanks for reading this!
Issue Links
- is duplicated by
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XSTR-458
JPA Entity + JSON serialization
-
Activity
I'm sure about the related bug cause i've used xstream with my pojos and worked fine. Theres a strange behavior on method toXML using the JettisonMappedXmlDriver() that throws:
>Method "toXML" in class "com.thoughtworks.xstream.XStream" threw an exception: instance of java.lang.ClassCastException(id=8119)<
Moretto
added a comment - I'm sure about the related bug cause i've used xstream with my pojos and worked fine. Theres a strange behavior on method toXML using the JettisonMappedXmlDriver() that throws:
>Method "toXML" in class "com.thoughtworks.xstream.XStream" threw an exception: instance of java.lang.ClassCastException(id=8119)< The both screens are about a test out of the transaction of JPA with Toplink. Only a single object instance being serialized to JSONObject.
Trying to serialize a Entity to JSON in the middle of the transaction. Here the problem occurs
Simple Pojo serialized to JSONObject notation. Works Fine
Moretto
added a comment - http://nemesis2web.googlecode.com/svn/trunk/src/java/net/cjb/malacma/nemesis2web/bo/ControleDeProduto.java
Trying to serialize a Entity to JSON in the middle of the transaction. Here the problem occurs
http://nemesis2web.googlecode.com/svn/trunk/src/java/net/cjb/malacma/nemesis2web/teste/TestXtreamJSON.java
Simple Pojo serialized to JSONObject notation. Works Fine Hi Moretto,
I've invited you more then once to talk about the complete issue on the user's list. Your setup is complex and a simple stack trace and screen shots does not really help us to analyze and recreate the problem in a minimal setup. Additionally I also told you in my first comment that there is more to say and consider in this scenario (yes, it is clear that you have a problem, but nothing can be said about its nature), but JIRA is not the right place for further usage advice. Since you refused up to now to communicate on the list, I have to close this issue, because neothing can be done on it anymore.
Sorry, Jörg
Jörg Schaible
added a comment - Hi Moretto,
I've invited you more then once to talk about the complete issue on the user's list. Your setup is complex and a simple stack trace and screen shots does not really help us to analyze and recreate the problem in a minimal setup. Additionally I also told you in my first comment that there is more to say and consider in this scenario (yes, it is clear that you have a problem, but nothing can be said about its nature), but JIRA is not the right place for further usage advice. Since you refused up to now to communicate on the list, I have to close this issue, because neothing can be done on it anymore.
Sorry, Jörg 
Hello Moretto,
there are some things to ask and to tell about this problem. However, the right place is the user's list to ask questions if you're uncertain about the correct usage of XStream. Therefore I am resolving this issue, you may reopen it, if we can confirm a real issue with XStream.