Suppose you want write a jaxb class in groovy. Why? Because you do not have to write these all getters, setters and other methods. You only have to write your fields down.<\/p>\n
@XmlRootElement \r\n@HashCodeAndEquals \r\n@ToString \r\nclass Person {\r\n String firstName String lastName Integer age\r\n}<\/pre>\n <\/p>\n
Lets check if we could unmarshal xml to Person class:<\/p>\n
def 'should unmarshall person xml to object'(){\r\n given:\r\n JAXBContext jc = JAXBContext.newInstance(Person)\r\n String xml = 'JohnSmith20' \r\n expect:\r\n jc.createUnmarshaller().unmarshal(new StringReader(xml)) == new Person(firstName: 'John', lastName: 'Smith', age: 20)\r\n}<\/pre>\n <\/p>\n
When we try this, then we obtain an eception:<\/p>\n
com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions\r\ngroovy.lang.MetaClass is an interface, and JAXB can't handle interfaces.\r\n this problem is related to the following location:\r\n at groovy.lang.MetaClass\r\n at public groovy.lang.MetaClass com.blogspot.przybyszd.jaxbingroovy.Person.getMetaClass()\r\n at com.blogspot.przybyszd.jaxbingroovy.Person\r\n\r\n at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:91)\r\n at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:445)\r\n at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.(JAXBContextImpl.java:277)\r\n at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.(JAXBContextImpl.java:124)\r\n at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1123)\r\n at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:147)\r\n at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:247)\r\n at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:234)\r\n at javax.xml.bind.ContextFinder.find(ContextFinder.java:462)\r\n at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:641)\r\n at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:584)\r\n at com.blogspot.przybyszd.jaxbingroovy.PersonJaxbTest.should unmarshall person xml to object(PersonJaxbTest.groovy:10)\r\n\r\n<\/pre>\nIt is because groovy defines getMetaClass method for us. Marshaller and Unmarshaller use by default<\/p>\n
XmlAccessType.PUBLIC_MEMBER<\/a> what means that public getters and setters should be used during marshalling\/unmarshalling. To solve this just add XmlAccessorType<\/a> annotatnio with XmlAccessType.FIELD<\/a> on jaxb class:<\/p>\n@XmlRootElement @EqualsAndHashCode @XmlAccessorType(XmlAccessType.FIELD) class Person {\r\n String firstName String lastName Integer age\r\n}<\/pre>\n <\/p>\n
Of course if you want to apply this rule for each jaxb class in package, then you could put XmlAccessorType in pacakge-info.java file.<\/p>\n
@XmlAccessorType(XmlAccessType.FIELD) package com.blogspot.przybyszd.jaxbingroovy;\r\nimport javax.xml.bind.annotation.XmlAccessType;\r\nimport javax.xml.bind.annotation.XmlAccessorType;<\/pre>\n <\/p>\n
Great, it works. Now let’s check out marshaller:<\/p>\n
def 'should marshall person'() {\r\n given:\r\n JAXBContext jc = JAXBContext.newInstance(Person)\r\n Person p = new Person(firstName: 'John', lastName: 'Smith', age: 20)\r\n StringWriter sw = new StringWriter()\r\n when:\r\n jc.createMarshaller().marshal(p, sw)\r\n then:\r\n String xml = sw.toString()\r\n GPathResult gPathResult = new XmlSlurper().parseText(xml)\r\n gPathResult.name() == 'person'\r\n gPathResult.firstName == 'John'\r\n gPathResult.lastName == 'Smith'\r\n gPathResult.age == '20'\r\n}<\/pre>\n <\/p>\n