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Freshers / Beginner level questions & answers

Ques 1. What Is XML Binding?

Maps XML to in-memory objects according to a schema. Generates classes to represent XML elements so developers don't have to write them the binding compiler does this the classes follow JavaBeans property access conventions. Supports three primary operations: 

  • Marshalling a tree of objects into an XML document
  • Unmarshalling an XML document into a tree of objects
  • Includes validation of the XML against the schema 
It is used to generate the classes of the objects validation of object trees against the schema used to generate their classes. Some constraints are enforced while working with the objects and others are only enforced when validation is requested.

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Ques 2. What is XML Binding Relationships?

The relationships between the components involved in XML binding (data binding) are shown below:

schema > classes < objects < > XML > schema
  • Schema generates classes.
  • Objects are instanceof classes.
  • Marshal from objects to XML.
  • Unmarshall from XML to objects.
  • XML validates and conforms to Schema.

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Ques 3. Why Use XML Binding?

  • It's not necessary. Everything that must be done with XML can be done with SAX and DOM.
  • It's easier, don't have to write as much code, don't have to learn SAX and/or DOM.
  • It's less error-prone, all the features of the schema are utilized, don't have to remember to manually implement them.
  • It can allow customization of the XML structure unlike XMLEncoder and XMLDecoder in the java.beans package.

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Ques 4. Please explain JAXB Use Cases.

  • Create/Read/Modify XML using Java but without using SAX or DOM.
  • Validate user input using rules described in XML Schemas.
  • Use XML-based configuration files, access their values, write tools that creates and modifies these files.

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Ques 5. What are the goals of JAXB?

  • Easy to use require minimal XML knowledge, don't require SAX/DOM knowledge.
  • Customizable can customize mapping of XML to Java.
  • Portable can change JAXB implementation without changing source code.
  • Deliver soon, deliver core functionality ASAP.
  • Follow standard design and naming conventions in generated Java.
  • Match schema, easy to identify generated Java components that correspond to schema features.
  • Hide plumbing encapsulate implementation of unmarshalling, marshalling and validation.
  • Validation, on demand validate objects without requiring marshalling.
  • Preserve object equivalence (round tripping), marshalling objects to XML and unmarshalling back to objects results in equivalent objects.

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Ques 6. What are the disadvantages/non-goals of JAXB?

• Standardize generated Java
– classes generated by different
JAXB implementations may not be
compatible with each other
• Preserve XML equivalence
– unmarshalling XML to objects and
marshalling back to XML may not
result in equivalent XML
• Bind existing JavaBeans
to schemas
– can only marshal and unmarshal
classes generated by JAXB
– may be added later
• Schema evolution support
– can’ t modify previously generated
code to support schema changes
– must generated new code
• Allow generated Java to access
XML elements/attributes not
described in initial schema
• Partial binding
– unmarshalling only a subset
of an XML document
breaks round tripping
• Implement every feature of the
schema language
– it’ s tough to implement
all of XML Schema!
• Support DTDs
– focusing on XML Schema
– DTDs were supported in an earlier
version, but won’ t be anymore
– tools for converting DTDs to
XML Schemas exist

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Ques 7. Give me an example of XSD.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema elementFormDefault="qualified"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns="http://www.withoutbook.com/cars"
targetNamespace="http://www.withoutbook.com/cars">
<xs:complexType name="car">
<xs:sequence>
<xs:element name="make" type="xs:string"/>
<xs:element name="model" type="xs:string"/>
<xs:element name="color" type="xs:string"/>
</xs:sequence>
<xs:attribute name="year" type="xs:positiveInteger" use="required"/>
</xs:complexType>
<xs:element name="cars">
<xs:complexType>
<xs:sequence>
<xs:element name="car" type="car" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

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Ques 8. Give me an example of XML document.

<?xml version="1.0" encoding="UTF-8"?>
<cars xmlns="http://www.withoutbook.com/cars"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.withoutbook.com/cars cars.xsd">
<car year="2001">
<make>BMW</make>
<model>Z3</model>
<color>yellow</color>
</car>
<car year="2001">
<make>Honda</make>
<model>Odyssey</model>
<color>green</color>
</car>
<car year="1997">
<make>Saturn</make>
<model>SC2</model>
<color>purple</color>
</car>
</cars>

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Ques 9. How to generate Java from XML Schema. Please show the example.

• From command-line
– Windows: %JAXB_HOME%binxjc cars.xsd
– UNIX: %JAXB_HOME%/bin/xjc.sh cars.xsd
– these write generated files to current directory
• From Ant
<java jar="${env.JAXB_HOME}/lib/jaxb-xjc.jar" fork="yes">
<arg line="-d ${gen.src.dir} cars.xsd"/>
</java>

Generated Files:

• com/withoutbook/cars directory
– Car.java
• interface representing the “car” complex type
• only describes get and set methods for car properties
– Cars.java
• interface representing “cars” global element
• extends CarsType and javax.xml.bind.Element (just a marker interface)
• describes no additional methods
– CarsType.java
• interface representing anonymous complex type
defined inside the “cars” global element
• provides method to get collection of Car objects (as a java.util.List)
– ObjectFactory.java
• class used to create objects of the above interface types
• extends DefaultJAXBContextImpl which extends JAXBContext
– bgm.ser
• a serialized object of type com.sun.msv.grammar.trex.TREXGrammar
• can’t find any documentation on this - don’t know its purpose
– jaxb.properties
• sets a property that defines the class used to create JAXBContext objects

• com/withoutbook/cars/impl directory
– CarImpl.java
• class that implements Car
• corresponds to the “car” XML Schema complexType
– CarsTypeImpl.java
• class that implements CarType
• corresponds to the XML Schema anonymous type inside the “cars” element
– CarsImpl.java
• class that extends CarsTypeImpl and implements Cars
• corresponds to the “cars” XML Schema element

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Ques 10. How to unmarshall XML into Java objects? Convert from XML to Java objects.

• Example
ObjectFactory factory = new ObjectFactory();
Unmarshaller u = factory.createUnmarshaller();
Cars cars = (Cars) u.unmarshal(new FileInputStream("cars.xml"));
• unmarshal method accepts
– java.io.File
– java.io.InputStream
– java.net.URL
– javax.xml.transform.Source
• related to XSLT
– org.w3c.dom.Node
• related to DOM
– org.xml.sax.InputSource
• related to SAX

• Other Unmarshaller methods
– void setValidating(boolean validating)
• true to enable validation during unmarshalling; false to disable (the default)
– boolean setEventHandler(ValidationEventHandler handler)
• handleEvent method of ValidationEventHandler is called
if validation errors are encountered during unmarshalling
• default handler terminates marshalling after first error
• return true to continue unmarshalling
• return false to terminate with UnmarshalException
• see discussion of ValidationEventCollector later

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Ques 11. Java code for marshalling Java objects into XML.

• Example
Marshaller m = factory.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
Writer fw = new FileWriter("newCars.xml");
m.marshal(cars, fw);
• marshal method accepts
– java.io.OutputStream
– java.io.Writer
– javax.xml.transform.Result
• related to XSLT
– org.w3c.dom.Node
• related to DOM
– org.xml.sax.ContentHandler
• related to SAX

• Other Marshaller methods
– boolean setEventHandler(ValidationEventHandler handler)
• same as use with Unmarshaller, but validation events
are delivered during marshalling
– void setProperty(String name, Object value)
• supported properties are
– jaxb.encoding - value is a String
» the encoding to use when marshalling; defaults to “UTF-8”
– jaxb.formatted.output - value is a Boolean
» true to output line breaks and indentation; false to omit (the default)
– jaxb.schemaLocation - value is a String
» to specify xsi:schemaLocation attribute in generated XML
– jaxb.noNamespaceSchemaLocation - value is a String
» to specify xsi:noNamespaceSchemaLocation attribute in generated XML

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Ques 12. Java example/java program to set object for generating XML.

Cars cars = factory.createCars();
Car car = factory.createCar();
car.setColor("blue");
car.setMake("Mazda");
car.setModel("Miata");
car.setYear(BigInteger.valueOf(2012));
cars.getCar().add(car);
car = factory.createCar();
car.setColor("red");
car.setMake("Ford");
car.setModel("Mustang II");
car.setYear(BigInteger.valueOf(2011));
cars.getCar().add(car);

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Ques 13. How to validate java objects?

• The graph of Java objects can contain invalid data
– could occur when objects created by unmarshalling are modified
– could occur when objects are created from scratch
• Use a Validator to validate the objects
• Example
Validator v = factory.createValidator();
try {
v.validateRoot(cars);
v.validate(car);
} catch (ValidationException e) {
// Handle the validation error described by e.getMessage().
}

• Other Validator methods
– boolean setEventHandler(ValidationEventHandler handler)
• handleEvent method of ValidationEventHandler is called
if validation errors are encountered
• default handler terminates marshalling after first error
• return true to continue validating
• return false to terminate with ValidationException

Pass an instance of javax.xml.bind.util.ValidationEventCollector
(in jaxb-api.jar) to setEventHandler to collect validation errors and
query them later instead of handling them during validation.
ValidationEventCollector vec =
new ValidationEventCollector();
v.setEventHandler(vec);
v.validate(cars);
ValidationEvent[] events = vec.getEvents();

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