[Hibernate, REST Jersey] Problème dans la transformation des données en JSON
Bonjour,
Je travaille sur une app web dont je voudrais afficher mes données sous format JSON. pour ça, je travaille avec Hibernate et Jersey.
Voilà ma classe qui sert au contrôleur :
Code:
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| @Path("/Country")
public class CountryResource {
// The @Context annotation allows us to have certain contextual objects
// injected into this class.
// UriInfo object allows us to get URI information (no kidding).
@Context
UriInfo uriInfo;
// Another "injected" object. This allows us to use the information that's
// part of any incoming request.
// We could, for example, get header information, or the requestor's address.
@Context
Request request;
// Basic "is the service running" test
@GET
@Produces(MediaType.TEXT_PLAIN)
public String respondAsReady() {
return "Demo service is ready!";
}
@GET
@Path("sample")
@Produces({MediaType.APPLICATION_JSON})
public List<Country> getSamplePerson() {
CountryDaoImpl countryDao = new CountryDaoImpl();
return countryDao.findAll();
}
} |
Voilà mon fichier web.xml :
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| <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>RestWebService</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.businesschat.resource</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app> |
Quand j'accède à l'url : http://localhost:8082/WS_BusinessCha...Country/sample, les erreurs ci-dessous apparaissent :
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| juil. 25, 2013 9:06:27 PM com.sun.jersey.spi.container.ContainerResponse logException
Grave: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.internal.SAXException2: A cycle is detected in the object graph. This will cause infinitely deep XML: com.businesschat.model.Country@1ac5579 -> com.businesschat.model.City@1418853 -> com.businesschat.model.Country@1ac5579]
at com.sun.jersey.core.provider.jaxb.AbstractListElementProvider.writeTo(AbstractListElementProvider.java:266)
at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:306)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1479)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:291)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.internal.SAXException2: A cycle is detected in the object graph. This will cause infinitely deep XML: com.businesschat.model.Country@1ac5579 -> com.businesschat.model.City@1418853 -> com.businesschat.model.Country@1ac5579]
at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(Unknown Source)
at com.sun.jersey.json.impl.provider.entity.JSONListElementProvider.writeList(JSONListElementProvider.java:145)
at com.sun.jersey.core.provider.jaxb.AbstractListElementProvider.writeTo(AbstractListElementProvider.java:264)
... 20 more
Caused by: com.sun.istack.internal.SAXException2: A cycle is detected in the object graph. This will cause infinitely deep XML: com.businesschat.model.Country@1ac5579 -> com.businesschat.model.City@1418853 -> com.businesschat.model.Country@1ac5579
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.reportError(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.pushObject(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty.serializeItem(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayERProperty.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsSoleContent(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsRoot(Unknown Source)
... 24 more |
Merci d'avance pour vos renseignements.
