jakarta-ee

问题 org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: pojo.Person.address, no session or session was closed. I am getting this exception and I'm using Spring 3.0 and Hibernate 3.6. 回答1: It looks like you have an Entity called Person which has a lazily loaded mapped collection of Addresses? You have loaded the Person and the session it was loaded in has now been closed. After the session was closed you then attempted to access that collection of address

问题 JAXB can't parse the bindings for this example: <xs:element name="classA" type="classA" substitutionGroup="classSubA"/> <xs:complexType name="complexClassA" mixed="true"> <xs:attribute name="attA"> <xs:annotation> <xs:appinfo> <moProperty value="classA:attA"/> <label value="Attribute A" default="true"/> <externAccess value="readWrite"/> <description value="NO COMMENTS"/> </xs:appinfo> </xs:annotation> <xs:simpleType> <xs:restriction base="xs:string"> <xs:enumeration value="off"/> <xs

问题 I'm hoping not to re-invent the wheel -- I'm fairly new to Java, but I need a simple but robust algorithm/code/software to perform email verification for users of a web application (e.g. I only need help with step 4 below). That is, I need to verify the user logging in has access to the email address he/she provides during log in. The steps I have in mind for the Java middle-tier would be: Java POJO receives user's email and password from client. The POJO talks to a database server to verify

问题 I'm hoping not to re-invent the wheel -- I'm fairly new to Java, but I need a simple but robust algorithm/code/software to perform email verification for users of a web application (e.g. I only need help with step 4 below). That is, I need to verify the user logging in has access to the email address he/she provides during log in. The steps I have in mind for the Java middle-tier would be: Java POJO receives user's email and password from client. The POJO talks to a database server to verify

问题 I have written an application with approximately 500 classes in java , Now I know this has been asked plenty of times here, but I still couldn't find a proper resource or tutorial for creating a data flow diagram for my entire project. Any help/tutorial/resource or code sample would be appreciated. 回答1: You might be able to derive data flows from your unit tests. If you have a instance A and a mock B and you expect instance C to be passed in as a prameter to B.bar(Object) when you call A.foo

问题 I've read Java EE documentation and for me is unclear one thing. According to API, the only way to find another Session is a code like this: (assuming that we've identifier of other session): import javax.websocket.Session; ... private static Session findOtherSessionById(Session user, String id) { for (Session session : user.getOpenSessions()) { if (id.equals(session.getId())) { return session; } } return null; } But when we've thousands of users, this code is a performance bottleneck. So, is

问题 I've read Java EE documentation and for me is unclear one thing. According to API, the only way to find another Session is a code like this: (assuming that we've identifier of other session): import javax.websocket.Session; ... private static Session findOtherSessionById(Session user, String id) { for (Session session : user.getOpenSessions()) { if (id.equals(session.getId())) { return session; } } return null; } But when we've thousands of users, this code is a performance bottleneck. So, is

问题 I got the project from repository and as per the set-up instructions I tried to create a project in eclipse and pointed the location to where I downloaded the code from repository. Then when I click on finish I got the error stating "One or more constraints have not been satisfied. Cannot install project facet Java 1.6. Some version of this project facet is already installed. Cannot install project facet Dynamic Web Module 3.0. Some version of this project facet is already installed." How to

问题 I got the project from repository and as per the set-up instructions I tried to create a project in eclipse and pointed the location to where I downloaded the code from repository. Then when I click on finish I got the error stating "One or more constraints have not been satisfied. Cannot install project facet Java 1.6. Some version of this project facet is already installed. Cannot install project facet Dynamic Web Module 3.0. Some version of this project facet is already installed." How to

问题 To give a little context to my issue... I have a Java EE web application (as a UI / client) that accesses services for data / business logic via a REST interface using the JAX-RS 2.0 client API (Resteasy implementation). Currently I inject a new JAXRS Client instance per request using a RequestScoped CDI managed bean, the thinking being that the client app may call multiple backend resources per request and I reuse the same JAXRS Client for the whole request (although I read somewhere this