mkyong

spring security August 23, 2011 1 min read by mkyong 18 comments

Spring Security logout example

In Spring Security, to log out, just add a link to url “j_spring_security_logout“, for example : <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <html> <body> <h2>messages, whatever</h2> <a href="<c:url value="j_spring_security_logout" />" > Logout</a> </body> </html> In Spring security, declares “logout” tag, and configure the “logout-success-url” attribute : <beans:beans xmlns="http://www.springframework.org/schema/security" xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.0.3.xsd"> <http auto-config="true"> <intercept-url […]

spring security August 22, 2011 4 min read by mkyong 23 comments

Spring Security : Customize 403 access denied page

In Spring Security, if non authorized user try to access a protected page, a default “http 403 access denied” will be displayed : In this tutorial, we will show you how to customize 403 access denied page in Spring Security. 1. Spring Security Configuration Review a configuration, if “alex” try to access /admin page, above […]

spring security August 22, 2011 3 min read by mkyong 16 comments

Spring Security access control example

In Spring Security, access control or authorization is easy to implement. See following code snippet : <http auto-config="true"> <intercept-url pattern="/admin*" access="ROLE_ADMIN" /> </http> It means, only user with authority of “ROLE_ADMIN” is allow to access URI /admin*. If non authorized user try to access it, a “http 403 access denied page” will be displayed. Spring […]

maven August 21, 2011 1 min read by mkyong 7 comments

Get HttpServletRequest via Maven repository

Problem Using Maven build tool, which jar should include to use HttpServletRequest or HttpServletResponse? Solution To use HttpServletRequest or HttpServletResponse in a development environment, include servlet-api. jar in your Maven pom.xml file. pom.xml <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> Put scope as provided, because most j2ee containers have this jar. You need this for complication […]

spring security August 21, 2011 1 min read by mkyong 0 comments

ClassNotFoundException : DefaultSavedRequest

Problem Working with Spring Security, which jar contains DefaultSavedRequest? SEVERE: Exception loading sessions from persistent storage java.lang.ClassNotFoundException: org.springframework.security.web.savedrequest.DefaultSavedRequest at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) Solution DefaultSavedRequest is inside spring-security-web.jar. Visit this Spring Security hello world example for the list of dependencies libraries. <!– Spring Security & dependencies –> <dependency> <groupId>org.springframework.security</groupId> […]

spring security August 18, 2011 9 min read by mkyong 157 comments

Spring Security form login using database

In this tutorial, we will show you how to perform database authentication (using both XML and Annotations) in Spring Security. Technologies used : Spring 3.2.8.RELEASE Spring Security 3.2.3.RELEASE Spring JDBC 3.2.3.RELEASE Eclipse 4.2 JDK 1.6 Maven 3 Tomcat 6 or 7 (Servlet 3.x) MySQL Server 5.6 Previous login-form in-memory authentication will be reused, enhance to […]

spring security August 18, 2011 4 min read by mkyong 35 comments

Spring Security password hashing example

In this tutorial, we will show you how to use BCryptPasswordEncoder to hash a password and perform a login authentication in Spring Security. In the old days, normally, we used MD5 Md5PasswordEncoder or SHA ShaPasswordEncoder hashing algorithm to encode a password… you are still allowed to use whatever encoder you like, but Spring recommends to […]

spring security August 18, 2011 1 min read by mkyong 12 comments

Spring Security HTTP basic authentication example

When HTTP basic authentication is configured, web browser will display a login dialog for user authentication. This tutorial show you how to configure HTTP basic authentication in Spring Security. <http> <intercept-url pattern="/welcome*" access="ROLE_USER" /> <http-basic /> </http> Last Spring Security form-based login example will be reused, but switch authentication to support HTTP basic. 1. Spring […]

spring security August 17, 2011 5 min read by mkyong 94 comments

Spring Security Custom Login Form Example

By default, if no login form is specified, Spring Security will create a default login form automatically. Please refer to this – Spring Security hello world example. In this tutorial, we will show you how to create a custom login form for Spring Security (XML example). Technologies used : Spring 3.2.8.RELEASE Spring Security 3.2.3.RELEASE Eclipse […]

spring security August 17, 2011 2 min read by mkyong 20 comments

Get current logged in username in Spring Security

In this article, we will show you three ways to get the current logged in username in Spring Security. 1. SecurityContextHolder + Authentication.getName() import org.springframework.security.core.Authentication; import org.springframework.security.core.context.SecurityContextHolder; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @Controller public class LoginController { @RequestMapping(value="/login", method = RequestMethod.GET) public String printUser(ModelMap model) { Authentication auth = SecurityContextHolder.getContext().getAuthentication(); String name […]

spring security August 17, 2011 1 min read by mkyong 16 comments

Display custom error message in Spring Security

In Spring Security, when authentication is failed, following predefined error messages will be displayed : Spring display : Bad credentials In this article, we show you how to override above error message and display your custom error message. For example, Spring display : Bad credentials You want override it with this message : Invalid username […]

spring security August 16, 2011 5 min read by mkyong 118 comments

Spring Security hello world example

In this tutorial, we will show you how to integrate Spring Security with a Spring MVC web application to secure a URL access. After implementing Spring Security, to access the content of an “admin” page, users need to key in the correct “username” and “password”. Technologies used : Spring 3.2.8.RELEASE Spring Security 3.2.3.RELEASE Eclipse 4.2 […]

tutorials August 12, 2011 3 min read by mkyong 0 comments

Java JSON Tutorials

Java JSON Tutorials with full example, including how to read, write JSON with Jackson, Gson and JSON.simple frameworks.

java August 11, 2011 1 min read by mkyong 16 comments

How to loop ArrayList in Java

No nonsense, four ways to loop ArrayList in Java For loop For loop (Advance) While loop Iterator loop package com.mkyong.core; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class ArrayListLoopingExample { public static void main(String[] args) { List<String> list = new ArrayList<String>(); list.add("Text 1"); list.add("Text 2"); list.add("Text 3"); System.out.println("#1 normal for loop"); for (int i = […]

java August 11, 2011 2 min read by mkyong 0 comments

Convert JSON string to Map using Jackson

This article uses the Jackson framework to parse JSON strings to a Map in Java. Table of contents: 1. Download Jackson 2. Convert JSON string to Map 3. Convert Map to JSON string 4. Download Source Code 5. References P.S Tested with Jackson 2.17.0 1. Download Jackson Simply declare jackson-databind in the pom.xml, and it […]

java August 11, 2011 5 min read by mkyong 1 comment

Read and write JSON using JSON.simple

This article shows how to read and write JSON using JSON.simple. Table of contents: 1. Setup JSON.simple 2. Write JSON to File using JSON.simple 3. Read JSON from File using JSON.simple 4. Java object to JSON using JSON.simple 5. JSON to Java Object using JSON.simple 6. Download Source Code 7. References P.S Tested with json-simple […]

java August 11, 2011 6 min read by mkyong 0 comments

Gson Streaming APIs to read and write JSON

Streaming APIs are efficient ways of processing large JSON files or data without loading the entire document into memory. Gson provides JsonReader and JsonWriter classes for JSON streaming. Gson’s Streaming API JsonWriter – Write JSON as a stream. JsonReader – Read JSON as a stream. Table of contents: 1. Setup Google Gson 1. Write JSON […]

java August 10, 2011 5 min read by mkyong 0 comments

Jackson Streaming API examples

This article shows how to use Jackson’s Streaming API for both reading from and writing to JSON. Jackson’s Streaming API JsonGenerator – Write JSON data JsonParser – Read and Parse JSON data Table of contents: 1. Download Jackson 2. Write JSON using JsonGenerator 2. Write JSON Array using JsonGenerator 3. Read JSON using JsonParser 4. […]

java August 10, 2011 7 min read by mkyong 18 comments

Jackson Tree Model examples

Jackson’s Tree Model provides a flexible way to work with JSON data compared to the data-binding method. The Tree Model works well when the JSON data or JSON’s schema is unknown until runtime or the JSON structure does not map properly to Java classes. This article shows how to use Jackson’s Tree Model JsonNode and […]

java August 10, 2011 3 min read by mkyong 1 comment

How to enable pretty print JSON with Jackson

In Jackson, we can use writerWithDefaultPrettyPrinter() to pretty print the JSON strings. Table of contents: 1. Setup Jackson 2. Compact print JSON (Default) 3. Pretty print JSON with Jackson 4. Pretty print JSON with Jackson (Globally) 5. Download Source Code 6. References P.S Tested with Jackson 2.17.0 1. Setup Jackson Puts jackson-databind at pom.xml. pom.xml […]

java August 9, 2011 5 min read by mkyong 55 comments

How to convert Java object to / from JSON (Jackson)

In this tutorial, we show you how to use Jackson 1.x data binding to convert Java object to / from JSON. Note Jackson 1.x is a maintenance project, please use Jackson 2.x instead. Note This tutorial is obsolete, no more update, please refer to the latest Jackson 2 tutorial – Object to / from JSON. […]

java August 9, 2011 2 min read by mkyong 1 comment

How to pretty print JSON using Gson

This article shows how to pretty print JSON using Gson. Table of contents: 1. Setup Google Gson 2. Default Compact Print JSON 3. Pretty Print JSON using Gson 4. Download Source Code 5. References P.S Tested with Gson 2.10.1 1. Setup Google Gson Declare gson in the pom.xml. pom.xml <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.10.1</version> </dependency> 2. […]

java August 4, 2011 16 min read by mkyong 11 comments

JAXB hello world example

Jakarta XML Binding (JAXB; formerly Java Architecture for XML Binding) is an XML binding framework to convert Java objects to and from XML. XML Marshalling – Convert Java objects into XML. XML Unmarshalling – Convert XML back into Java Objects. Note This article will focus on Java 11, JAXB 3 and EclipseLink MOXy JAXB RI. […]

java August 4, 2011 3 min read by mkyong 10 comments

How to modify XML file in Java – (DOM Parser)

This tutorial shows how to use the Java built-in DOM Parser to modify an XML file. Table of contents 1. The XML file, before and after 2. Dom Parser modify XML file 3. Download Source Code 4. References P.S Tested with Java 11. Note Please read DOM parse XML and DOM write XML. 1. The […]

java August 4, 2011 4 min read by mkyong 1 comment

How to write XML file in Java – (JDOM)

This tutorial shows how to use the JDOM to write data to an XML file. Table of contents 1. Download JDOM 2.x 2. Write XML String to Console 3. Write XML to a file 4. Write XML attribute, comment, CDATA and etc 5. Change XML encoding 6. Download Source Code 7. References P.S Tested with […]

java August 4, 2011 4 min read by mkyong 2 comments

How to count XML elements in Java

This article shows how to use DOM parser, SAX parser, and XPath to count the number of a specified XML element in Java. Table of contents 1. An XML file 2. Count the XML elements (DOM Parser) 3. Count the XML elements (XPath) 4. Count the XML elements (SAX Parser) 5. Download Source Code 6. […]

spring mvc August 2, 2011 2 min read by mkyong 61 comments

Spring 3 REST hello world example

In Spring 3, old RequestMapping class is enhanced to support RESTful features, which makes Spring developers easier to develop REST services in Spring MVC. In this tutorial, we show you how to use Spring 3 MVC annotations to develop a RESTful style web application. 1. Project Directory Review the project folder structure. 2. Project Dependency […]

spring mvc August 1, 2011 6 min read by mkyong 38 comments

Spring 3 MVC ContentNegotiatingViewResolver example

Spring 3, ContentNegotiatingViewResolver, is an interesting view resolver, which allow you to output a same resource (content or data) to different type of views like JSP, XML, RSS, JSON and etc. Put it simple, see following web requested URL, which will return in different views. https://mkyong.com/fruit/banana.rss , returned as RSS file. https://mkyong.com/fruit/banana.xml , returned as […]

spring mvc July 29, 2011 4 min read by mkyong 61 comments

Spring 3 MVC and JSR303 @Valid example

In Spring 3, you can enable “mvc:annotation-driven” to support JSR303 bean validation via @Valid annotation, if any JSR 303 validator framework on the classpath. Note Hibernate Validator is the reference implementation for JSR 303 In this tutorial, we show you how to integrate Hibernate validator with Spring MVC, via @Valid annotation, to perform bean validation […]

spring mvc July 28, 2011 3 min read by mkyong 108 comments

Spring 3 MVC and JSON example

In this tutorial, we show you how to output JSON data in Spring MVC framework. Technologies used : Spring 3.2.2.RELEASE Jackson 1.9.10 JDK 1.6 Eclipse 3.6 Maven 3 P.S In Spring 3, to output JSON data, just puts Jackson library in the project classpath. 1. Project Dependencies Get Jackson and Spring dependencies. pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" […]

spring mvc July 27, 2011 4 min read by mkyong 29 comments

Spring 3 MVC and XML example

In Spring 3, one of the feature of “mvc:annotation-driven“, is support for convert object to/from XML file, if JAXB is in project classpath. In this tutorial, we show you how to convert a return object into XML format and return it back to user via Spring @MVC framework. Technologies used : Spring 3.0.5.RELEASE JDK 1.6 […]

spring mvc July 26, 2011 5 min read by mkyong 16 comments

Spring 3 MVC and RSS feed example

In Spring 3, comes with a abstract class “AbstractRssFeedView” to generate RSS feed view, using java.net’s ROME package. In this tutorial, we show you how to generate a RSS feed view from Spring MVC framework. Technologies used : Spring 3.0.5.RELEASE ROME 1.0.0 JDK 1.6 Eclipse 3.6 Maven 3 At the end of the tutorial, when […]

spring mvc July 23, 2011 1 min read by mkyong 0 comments

ClassNotFoundException : com.sun.syndication.feed.WireFeed

Problem Developing RSS with Spring MVC, extends “AbstractRssFeedView“, hit following error message during application start up. Caused by: java.lang.NoClassDefFoundError: com/sun/syndication/feed/WireFeed at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) at java.lang.Class.getDeclaredConstructors(Class.java:1836) //… Caused by: java.lang.ClassNotFoundException: com.sun.syndication.feed.WireFeed at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1516) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) … 41 more Solution Spring MVC using “ROME” to generate RSS feed. For Maven, include below dependency […]

jax-rs July 20, 2011 4 min read by mkyong 67 comments

Jersey + Spring integration example

This tutorial show you how to integrate Jersey web application with Spring framework. Technologies used : Jersey 1.8 Spring 3.0.5.RELEASE Eclipse 3.6 Maven 3 1. Project Dependency Declares Jersey 1.8, Spring3 and “jersey-spring.jar” dependencies in Maven pom.xml file. Note In “jersey-spring.jar” version, it will download all the Spring 2.5.6 dependencies. To use Spring 3, you […]

tutorials July 19, 2011 2 min read by mkyong 56 comments

JAX-RS Tutorial

A series of JAX-RS tutorials on using both Jersey and RESTEasy frameworks.

spring July 19, 2011 1 min read by mkyong 12 comments

Spring request scope error : No thread-bound request found

Problem Developing web application with Spring, make a bean with scope of “request“. @Component @Scope("request") public class PaymentService { @Autowired UserBo userBo; //… But hit following error message? Caused by: java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally […]

jax-rs July 19, 2011 3 min read by mkyong 74 comments

RESTful Java client with Jersey client

This tutorial show you how to use Jersey client APIs to create a RESTful Java client to perform “GET” and “POST” requests to REST service that created in this “Jersey + Json” example. 1. Jersey Client Dependency To use Jersey client APIs, declares “jersey-client.jar” in your pom.xml file. File : pom.xml <dependency> <groupId>com.sun.jersey</groupId> <artifactId>jersey-client</artifactId> <version>1.8</version> […]

jax-rs July 19, 2011 10 min read by mkyong 1 comment

Jersey and JSON examples (Jackson)

This article shows how to return a JSON response in the Jersey application, using Jackson 2.x. Tested with Jersey 3.0.2 Grizzly 3 HTTP Server Jackson 2.12.2 Java 11 Maven JUnit 5 and JSONassert 1.5 (Unit Test) Table of contents 1. Jackson as the JSON provider in Jersey 2. Project Directory 3. Project dependencies 4. Jersey […]

jax-rs July 19, 2011 2 min read by mkyong 16 comments

XML example with Jersey + JAXB

This tutorial show you how to use JAXB to convert object to XML in Jersey, and return it back to user. 1. Dependency To integrate JAXB with Jersey, no extra dependency is required. Just include “jersey-server.jar” will do. 2. JAXB Annotation Annotate object with JAXB annotation, for conversion later. import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; […]

jax-rs July 18, 2011 2 min read by mkyong 124 comments

File upload example in Jersey

In this tutorial, we show you how do to file upload with Jersey, JAX-RS implementation. 1. Jersey Multipart Dependency To support multipart (file upload) in Jersey, you just need to include “jersey-multipart.jar” in Maven pom.xml file. <project …> <repositories> <repository> <id>maven2-repository.java.net</id> <name>Java.net Repository for Maven</name> <url>http://download.java.net/maven/2/</url> <layout>default</layout> </repository> </repositories> <dependencies> <dependency> <groupId>com.sun.jersey</groupId> <artifactId>jersey-server</artifactId> <version>1.8</version> </dependency> […]

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