Ankur Gupta [https://community.jboss.org/people/geekerebos] created the discussion
"javassist not injecting annotation on an existing field" To view the discussion, visit: https://community.jboss.org/message/801815#801815 -------------------------------------------------------------- | 0 down vote favorite (http://stackoverflow.com/questions/15332399/javassist-not-injecting-annotation-at-existing-field#) | I'm trying to inject JAXB annotation at runtime using Javassist. I have written following code: public class AssistAnnotationInjector { public static void addAnnotationRunTime(String className, String fieldName) throws NotFoundException, CannotCompileException, IOException, ClassNotFoundException{ CtClass ctClass = ClassPool.getDefault().get(className); ClassFile ccFile = ctClass.getClassFile(); ConstPool constPool = ccFile.getConstPool(); AnnotationsAttribute attr = new AnnotationsAttribute(constPool, AnnotationsAttribute.visibleTag); Annotation annot = new Annotation("javax.xml.bind.annotation.XmlTransient",constPool); attr.addAnnotation(annot); CtField field = ctClass.getDeclaredField(fieldName); field.getFieldInfo().addAttribute(attr); System.out.println(field.getAnnotation(XmlTransient.class)); ccFile.setVersionToJava5(); ctClass.writeFile(); } public static void main (String args[]) throws CannotCompileException, NotFoundException, IOException, SecurityException, NoSuchMethodException, ClassNotFoundException, JAXBException, NoSuchFieldException{ Person<Student> p = new Person<Student>(); p.setName("XYZ"); Student s = new Student(); s.setName("ABC"); s.setId("239423"); p.setPayload(s); addAnnotationRunTime("RuntimeAnnotation.Person", "name"); Field f = p.getClass().getDeclaredField("name"); System.out.println(f.getAnnotation(XmlTransient.class)); JAXBContext context = JAXBContext.newInstance(p.getClass()); Marshaller mr = context.createMarshaller(); mr.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE); mr.marshal(p, System.out); } } And Person.java class is: @XmlRootElement(name="Person") @XmlAccessorType(XmlAccessType.FIELD) @XmlSeeAlso({Student.class}) public class Person <T>{ private T payload; private String name; public void setPayload(T payload){ this.payload = payload; } public T getPayload(){ return payload; } public void setName(String name){ this.name = name; } public String getName(){ return name; } } In AssistAnnotationInjector.java, I am trying to add XmlTransient annotation to 'name' field. But the name field is still coming in marshalling output. Why is it so? PS: marshal output is : @javax.xml.bind.annotation.XmlTransient null <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <Person> <payload xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:type="student"> <name>ABC</name> <id>239423</id> </payload> **<name>XYZ</name>** </Person> name tag was not expected to present in output.. | -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/801815#801815] Start a new discussion in Javassist at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2062]
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