All the class definitions now go to an area called "Metaspace". GC based on references is faster than it was in PermGen. Metaspace is in native-memory zone. Its size is unlimited by default. So as long as your machine has enough memory, OOM will not happen. You can still set a limit to it with …
Rich Domain Model + Lazy-loading cause problems Hiberntate encourages rich domain model over table model, that is, A.b instead of A.bId You must enable lazy-loading, otherwise there will be performance issues If you are not in a hibernate session, A.b will be invalid ("Partial Materialization" problem) To make user you are in a hibernate session, …
On web.xml bo-portal org.springframework.web.servlet.DispatcherServlet 1 bo-portal /boportal/* /boportal @RequestMapping(value = “/”) public String homepage(ModelMap model) { return “/some/page”; } @RequestMapping(value = “/boportal”) public String homepageWithoutSlash(ModelMap model) { return homepage(model); }
Your email must satisfy the following rules: 1. it’s a multi-part email 2. it has an "html" as one of its parts (content type must be set) 3. every image must have a header like "Content-ID: <some-id>", and of course, content type must be set 4. the <img> tags in your html must use "cid" …
You may find it useful where you can’t use Spring MVC’s StringTrimEditor the trim method /** * trim string fields to null. * Note: only the root string fields are trimmed. string fields of the * bean’s composite fields are let alone. * All reflection related security exceptions are ignored. * * @param bean */ …
The Problem When a bean is inserted or updated, its "createdAt" or "updatedAt" should be set as the current time. MyBatis won’t do that for you by default. You can manually set them before inserting them. But you may forget it. Solution The solution is to have a MyBatis interceptor which does the job before …
MyBatis: Automatically set timestamps for beans saved Read More »
Java doesn’t allow multi-value method returning. To return 2 values for a method, you can create a "pair" object which contains two values. /** * a pair of objects. like other containers, you’d rather return an empty * container than a null one * * * */ public class MyDuplet<L,R> { public L left; public …
Add bean validation dependency Hibernate provides an implementation of bean-validation. So we will dependent on it. But it has nothing to do with Hiberante ORM. org.hibernate hibernate-validator 5.1.3.Final Create a validator class as a spring bean @Component public class MyBeanValidator { @Resource private Validator validator; public <T> List<String> validateBean(T bean) { List<string> errors = new …
How to let one fxml include another, e.g. let every scene has a "header" ? Note you have to set "fx:id=…" There must be a controller for the included fxml file. Let’s call it HeaderController public class HeaderController { @FXML private Text errorText; … Include the HeaderController in your controller public class LoginController { //the …
The server side should send error code and error message. Is that all? Yes, basically it will work, but not perfect yet. What you need to do: 1. Differentiate known, user-readable errors from unknown, developer-readable errors. 2. Send an error ID to client side when there is an unknown error, with which the client …