On 29/01/2013 13:09, Christian Schneider wrote:
I have an issue serializing and unserializing ReportTO using jaxb.The problem is at the ReportletConf list: public List<ReportletConf> getReportletConfs() { return reportletConfs; } As ReportletConf is an interface JAXB can not handle it. So we get an IllegalAnnotationException or similar and JAXB does not even initialize. So I introduced the annotation below. This allowed the serialization to run. @XmlElement(type=AbstractReportletConf.class) The problem now is that the result of the serialization is not complete and can not be deserialized into the actual classes. This is how it looks (in an example I did with simplified classes: <?xml version="1.0" encoding="UTF-8" standalone="yes"?><report><reportletConfs><name>test</name><description>desc</description></reportletConfs></report> As you can see there is not enough information to detect the real class. So I tried to change the signature to use the abstract class and not use the annotation: public List<AbstractReportletConf> getReportletConfs() This works: <?xml version="1.0" encoding="UTF-8" standalone="yes"?><report><reportletConfs xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:type="staticReportletConf"><name>test</name><description>desc</description></reportletConfs></report> From the xsi:type jaxb knows the class to instantiate. So there are the following questions: - Is there a better way to achieve correct serialization of interfaces ?
I am not an expert at all of JAXB, passing this question.
- Would it be ok if I change ReportletTO to use the abstract class?
Not good, but still acceptable IMHO.
- I would like to avoid the xsi:type and instead have elements for each class extending AbstractReportletConf. Is that possible?
Same as above; we will have to remember this when we will finally write a wiki page about how to create custom reports via reportlets.
Regards. -- Francesco Chicchiriccò ASF Member, Apache Syncope PMC chair, Apache Cocoon PMC Member http://people.apache.org/~ilgrosso/
