javabeans

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I am looking for a simple Json (de)serializer for Java that might work with GWT. I have googled a bit and found some solutions that

问题 I use JavaFX NumberBindings in order to calculate certain values. Initially everything works as expected. After a rather small amount of time, however, the binding just stops working. I don\'t receive an Exception, either. I\'ve tried several bindings, as well as high- and low-level approaches. Even the calculation itself (when overridden) just stops and isn\'t called anymore. I\'ve also updated to the latest JDK (1.8.0_05) and rebuilt/restarted everything. The following Minimal Working

问题 if I have the following private member: private int xIndex; How should I name my getter/setter: getXindex() setXindex(int value) or getxIndex() setxIndex(int value) EDIT: or getXIndex() setXIndex(int value); ? 回答1: The correct answer is getxIndex() setxIndex(int value) if you want them to be used as properties according to section 8.8: Capitalization of inferred names of the JavaBeans API specification (e.g. access them via ${object.xIndex} in a JSP. 回答2: In accordance with JavaBeans API

问题 when i try to using bean validation with JPA using hibernate , the follwoing exception will occur : Exception in thread \"main\" javax.persistence.PersistenceException: [PersistenceUnit: Chapter11] Unable to build EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:915) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:890) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory

问题 I\'m trying to write a custom JSPX tag that reads the value of a given bean property from each object in a given list, with the name of that property passed to the tag as a JSP attribute. The tag would look something like this: <jsp:root xmlns:c=\"http://java.sun.com/jsp/jstl/core\" xmlns:jsp=\"http://java.sun.com/JSP/Page\" version=\"2.0\"> <jsp:output omit-xml-declaration=\"yes\"/> <jsp:directive.attribute name=\"items\" type=\"java.lang.Iterable\" required=\"true\" description=\"The items

问题 Eg. boolean isCurrent = false; What do you name its getter and setter? 回答1: Suppose you have boolean active; Accessors method would be public boolean isActive(){return this.active;} public void setActive(boolean active){this.active = active;} See Also Java Programming/Java Beans Code Conventions for the Java Programming Language 回答2: http://geosoft.no/development/javastyle.html#Specific is prefix should be used for boolean variables and methods. isSet , isVisible , isFinished , isFound ,

问题 I have a webapp running under Tomcat 3.2.1 that needs to make JNI calls in order to access data and methods in legacy C++ code. A servlet is loaded on startup of the webapp that, as part of its init method, causes a data set specific to that webapp instance to be loaded into the C++ data structures. This Java code for this servlet contains the following: static { try { System.loadLibrary(\"JCoreImpl\"); System.out.println(\"JCoreImpl loaded\"); m_bLibraryLoaded = true; } catch

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Difference between DTO, VO, POJO, JavaBeans? Hi please don\'t say my question is duplicate :-) I saw all questions but didn\'t understand the exact difference. Can someone explain what is POJO , Bean , Normal Class in easy language? 回答1: Normal Class : A Java class Java Beans : All properties private (use getters/setters) A public no-argument constructor Implements Serializable. Pojo : Plain Old Java Object is a

问题 Say I have a very simple java object that only has some getXXX and setXXX properties. This object is used only to handle values, basically a record or a type-safe (and performant) map. I often need to covert this object to key value pairs (either strings or type safe) or convert from key value pairs to this object. Other than reflection or manually writing code to do this conversion, what is the best way to achieve this? An example might be sending this object over jms, without using the

问题 I would like to perform validation in some of my input components such as <h:inputText> using some Java bean method. Should I use <f:validator> or <f:validateBean> for this? Where can I read more about it? 回答1: You just need to implement the Validator interface. @FacesValidator("myValidator") public class MyValidator implements Validator { @Override public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException { // ... if (valueIsInvalid) { throw