JAXB - Marshal Element Missing @XmlRootElement Annotation
Information on the root XML element is required when marshalling to or unmarshalling from a Java object. JAXB provides this information via the @XmlRootElement annotation which contains the name and namespace of the root XML element.
When trying to marshal a class which does not have a @XMLRootElement annotation defined, following error will be thrown: unable to marshal as an element because it is missing an @XmlRootElement annotation .
Alternatively, when trying to unmarshal, the Java runtime will report that an unsuspected element is found.
For this example let’s use following class representing a car with a basic structure. Note that a XmlRootElement is not defined!
Marshal when @XMLRootElement is missing #
Marshalling is the process of transforming the memory representation of an object to a data format suitable for storage or transmission. In the case of JAXB, it means converting a Java object into XML. The below code snippet shows the creation of a new Car instance.
The method below takes as input the above car object and tries to marshal it using JAXB.
When running the above method, the runtime returns an error as the Car class is missing the required @XMLRootElement annotation.
In order to be able to marshal the car object, we need to provide a root XML element.
This is done as shown below by first creating a qualified name which contains the name and namespace of the root XML element. In a next step, we create a new JAXBElement and pass the qualified name, class and, object. Using the created JAXBElement we call the marshal() method.
This time JAXB is able to successfully marshal the object and the result is the following:
Unmarshal when @XMLRootElement is missing #
Unmarshalling in JAXB is the process of converting XML content into a Java object. Let’s reuse the XML representation of a car that we generated in the previous section.
In the method below we pass the above XML file and try to unmarshal it to an instance of the Car class.
Note that it is also possible to use JAXB to create an object from an XML String instead of using a file.
When running the above code, the runtime returns an error as a root XML element is found (the XML has a root element) but the Car class does not define a @XMLRootElement and as such it is not expected.
In order to be able to unmarshal the object, we need to define a root XML element.
This is done as shown below by first manually creating the root JAXBElement of type Car by using the XML file and the class we are trying to unmarshal to. Then we create a Car object and assign the value of the previous created root JAXBElement .
This time JAXB is able to successfully unmarshal the object and the result is the following:
This concludes our code samples on how to marshal and unmarshal with missing @XmlRootElement annotation. If you found this post helpful or have any questions or remarks, please leave a comment below.
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Checking for @XmlRootElement annotation should be made optional in Jaxb2Marshaller [SPR-7931] #12586
spring-projects-issues commented Feb 2, 2011 • edited
Spring-projects-issues commented feb 3, 2011.
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Spring-projects-issues commented jun 14, 2011, spring-projects-issues commented jul 31, 2012.
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Annotation Type XmlRootElement
- a top level class
- an enum type
See "Package Specification" in javax.xml.bind.package javadoc for additional common information.
Optional Element Summary
Element detail.
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When your class is not annotated with @XmlRootElement then you need to wrap it in an instance of JAXBElement as you have done for one of your marshal operations:. jaxbMarshaller.marshal(new JAXBElement<VSM>(new QName("uri","local"), VSM.class, vsm), System.out); The exception is coming from the time you try to marshal the instance of VSM wihtout doing that:
unable to marshal type as an element because it is missing an @XmlRootElement annotation for auto generated classes. Unable to marshal type as XML element because @XmlRootElement annotation is missing. Including this which has a very neat explanation but uses Marshaller instead of JaxB2Marshaller
February 12, 2024. JAXB. Many times, we will need to marshal Java objects without JAXB annotations such as @XmlRootElement and we are not permitted to make any changes in the source code. This situation may occur when we are working with legacy code or some client jar for which we do not have source code.
unable to marshal type "com.codenotfound.jaxb.model.Car" as an. element because it is missing an @XmlRootElement annotation. In order to be able to marshal the car object, we need to provide a root XML element. This is done as shown below by first creating a qualified name which contains the name and namespace of the root XML element.
Oliver Drotbohm opened SPR-7931 and commented. The Jaxb2Marshaller is only supporting classes annotated with @XmlRootElement currently and there's no way to override that behaviour as supportsInternal(Class, boolean) is private. There are cases when you want to (un)marshal classes that are @XmlType annotated only. Especially when working with XJC, you get the @XmlRootElement annotation only ...
4. Marshalling - Converting Java Object to XML. Marshalling gives a client application the ability to convert a JAXB-derived Java object tree into XML data. By default, the Marshaller uses UTF-8 encoding when generating XML data. Next, we will generate XML files from Java objects.
public class Jaxb2Marshallerextends Object implements MimeMarshaller, MimeUnmarshaller, GenericMarshaller, GenericUnmarshaller, BeanClassLoaderAware, InitializingBean. Implementation of the GenericMarshaller interface for JAXB 2.2. The typical usage will be to set either the "contextPath" or the "classesToBeBound" property on this bean ...
Java example of JAXB @XmlRootElement annotation in detail along with its usage during marshalling and unmarshalling operations.. 1. @XmlRootElement Annotation. The @XmlRootElement maps a class or an enum type to an XML element. When a top-level class or an enum type is annotated with the @XmlRootElement annotation, then its value is represented as an XML element in an XML document.
extends Object. implements MimeMarshaller, MimeUnmarshaller, GenericMarshaller, GenericUnmarshaller, BeanClassLoaderAware, InitializingBean. Implementation of the GenericMarshaller interface for JAXB 2.0+. The typical usage will be to set either the "contextPath" or the "classesToBeBound" property on this bean, possibly customize the marshaller ...
You can use the ObjectFactory class to workaround for the classes which doesn't have the @XmlRootElement.ObjectFactory has overloaded methods. Method:1 It does simple creation of the object and . Method:2 It will wrap the object with @JAXBElement.. Always to use Method:2 to avoid javax.xml.bind.MarshalException - with linked exception missing an @XmlRootElement annotation
Jaxb2Marshaller() Implementation of the GenericMarshaller interface for JAXB 2.2. The typical usage will be to set either the "contextPath" or the "classesToBeBound" property on this bean, possibly customize the marshaller and unmarshaller by setting properties, schemas, adapters, and listeners, and to refer to it.
ObjectFactory has overloaded methods to wrap it around the JAXBElement. Method:1 does the simple creation of the object. Method:2 will wrap the object with @JAXBElement. Always use Method:2 to avoid javax.xml.bind.MarshalException - with linked exception missing an @XmlRootElement annotation.
Implementation of the GenericMarshaller interface for JAXB 2.2. The typical usage will be to set either the "contextPath" or the "classesToBeBound" property on this bean, possibly customize the marshaller and unmarshaller by setting properties, schemas, adapters, and listeners, and to refer to it.
Unable to marshal type as XML element because @XmlRootElement annotation is missing 0 How to override camelcase on root types in CXF (wadl2java)
Usage. The @XmlRootElement annotation can be used with the following program elements: a top level class. an enum type. See "Package Specification" in javax.xml.bind.package javadoc for additional common information. When a top level class or an enum type is annotated with the @XmlRootElement annotation, then its value is represented as XML ...
Why the @XmlRootElement Annotation is Checked For. Spring requires a root element when marshalling the object to XML. JAXB provides two mechanisms to do this: The @XmlRootElement annotation. Wrapping the root object in an instance of JAXBElement. Since the object is not wrapped in a JAXBElement Spring is ensuring that the other condition is met.
I am trying to consume a SOAP api and using JAXB plugin to generate Java classes from the WSDL. But I am getting following exception: org.springframework.oxm.MarshallingFailureException: JAXB marshalling exception; nested exception is javax.xml.bind.MarshalException - with linked exception: [com.sun.istack.internal.SAXException2: unable to marshal type as an element because it is missing an ...
Renaming the Marshalled Element. If you want to override the default element name then you can use the @XmlElement annotation regardless of what type the property is.. Employee. import javax.xml.bind.annotation.*; @XmlRootElement public class Employee { private Address address; private int employeeId; @XmlElement(name="ADDR") public Address getAddress() { return address; } public void ...
You may need to provide a binding file so that the generated class gets the @XMLRootElement annotation so that it can be unmarshalled by the default marshaller.. From the second answer here: I would like to add @XmlRoot annotation on CXF codegen Add the following fragments to POM.XML (replacing the binding file with the name you choose):
Implementation of the GenericMarshaller interface for JAXB 2.2.. The typical usage will be to set either the "contextPath" or the "classesToBeBound" property on this bean, possibly customize the marshaller and unmarshaller by setting properties, schemas, adapters, and listeners, and to refer to it.
The @RequestBody annotation maps the whole client request to a model class, using the model class's getter and setters. This mapping failed before since a @XMLRootElement was missing. @XmlRootElement(name = "JAXBDocument") public class JAXBDocument extends Document{. public JAXBDocument(Document document) {.