How to Convert ArrayList<Object> to a XML using JAXB?

Question

I am trying to convert ArrayList to xml using JAXB..

ArrayList<LDAPUser> myList = new ArrayList<LDAPUser>();

    myList = retrieveUserAttributes.getUserBasicAttributes(lastName,
            retrieveUserAttributes.getLdapContext());



    JAXBContext jaxbContext = JAXBContext.newInstance(LDAPUser.class);
    Marshaller jaxbMarshaller = jaxbContext.createMarshaller();

    StringWriter sw = new StringWriter();

    jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

     jaxbMarshaller.marshal(myList, sw);
     System.out.println(sw.toString());     
     return sw.toString();

... but its not working, I am getting this error:

27-Aug-2012 10:43:58 org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [spring] in context with path [/Spring3-LDAP-WebService] threw exception [Request processing failed; nested exception is javax.xml.bind.JAXBException: class java.util.ArrayList nor any of its super class is known to this context.] with root cause javax.xml.bind.JAXBException: class java.util.ArrayList nor any of its super class is known to this context. at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:554) at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:470) at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:314) at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:243) at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:96) at ie.revenue.spring.RestController.searchLdapUsersByLastNameTwo(RestController.java:69) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)...........

Please help! Thanks.

Piotr Gwiazda · Accepted Answer · 2012-08-27 10:53:32Z

4

Try to create a class that wraps your list and make it a xml root, e.g.:

@XmlRootElement
class LDAPUsers {
    private List<LDAPUser> users;
    ... get ... set ... constructor 
}

Then marshal LDAPUsers object.

answered Aug 27, 2012 at 10:53

Piotr Gwiazda

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2 Comments

user1534466 Over a year ago

I have the getters and setters,,,,constructor look like this.. public LDAPUsers() { if (ldapUser == null) { ldapUser = new ArrayList<LDAPUser>(); } }..is it right ?

Piotr Gwiazda Over a year ago

Yes, but in constructor the list will always be null unless you initialize it other way. if is not needed.

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