The tags <c:import> The <c:import> tag imports the contents of a URL and expose that in one of three ways: Import contents from a URL and write it out to the page (url may be relative or absolute): <c:import url="theUrl" /> Import contents from a URL and save it to a scoped variable string named by the var attribute. Use the scope attribute to define the scope of the exported variable. <c:import url="theUrl" var="importTest" scope="ses... Import a URL and expose to a Reader object named by the varReader attribute. The scope attribute does not apply. The varReader scoped variable can only be accessed within the body of <c:import> . <c:import url="theUrl" varReader="theReader"/> <c:url> The <c:url> tag constructs a URL and writes it out to the...

JSTL string manipulation functions String manipulation functions are simple and self-evident. You just need to know that they exist. Test it Make these additions to the expanded test application : Create a new Java class StringManipulation : package jstl.demo.handler; import java.... Create a new JSP ( stringmanipulation.jsp ) under webapp : <%@ taglib uri="http://java.sun.com/jsp/jstl/c... Compile and package the WAR with: mvn package Deploy the WAR to a servlet container of your choice (for example, Tomcat or JBoss). Test the page with this URL (Tomcat/JBoss running on port 8080): http://localhost:8080/jstl-demo/demo/StringManipulation You may adjust the URL if your servlet container runs on a different port or the web app is bound to a different context root.

Get the length of a collection The length function returns the size of a collection. It can be applied to any object supported by the JSTL core tag <c:forEach> , namely: Arrays Implementation of java.util.Collection Implementation of java.util.Iterator Implementation of java.util.Enumeration Implementation of java.util.Map String When used on String , it returns the number of characters in the string. Test it Make these additions to the expanded test application : Create a new Java class LengthFunction : package jstl.demo.handler; import java.... Create a new JSP ( lengthfunction.jsp ) under webapp : <%@ taglib uri="http://java.sun.com/jsp/jstl/c... Compile and package the WAR with: mvn package Deploy the WAR to a servlet container of your choice (for example, Tomcat or JBoss). Test the page with this URL...

The tags <sql:update> Executes SQL INSERT , UPDATE , DELETE statements, or SQL DDL statements. Syntax: <sql:update sql="sqlUpdate" [dataSource="d... or, put the SQL within the element body: <sql:update [dataSource="dataSource"] [v... Attributes: Name Dynamic? Type Description sql true String SQL update statement. dataSource true javax.sql.DataSource or String Data source associated with the database to update. A String value represents a relative path to a JNDI resource or the parameters for the JDBC DriverManager class. var false String Name of the exported scoped variable for the result of the database update. The type of the scoped variable is java.lang.Integer . scope false String Scope of var. Defaults to "page". <sql:transaction> Establishes a transaction context for <sql:query> and <sql:update> subtags. Syntax: <sql:transaction [dataSource="dataSource"] ... where...

The tags <sql:query> Queries a database. Syntax: <sql:query sql="sqlQuery" var="varName" [scope... or, put the query within the element body: <sql:query var="varName" [scope="{page|req... Attributes: Name Dynamic? Type Description sql true String SQL query statement. dataSource true javax.sql.DataSource or String Data source associated with the database to query. A String value represents a relative path to a JNDI resource or the JDBC parameters for the DriverManager class. maxRows true int The maximum number of rows to be included in the query result. If not specified, or set to -1, no limit on the maximum number of rows is enforced. startRow true int The returned Result object includes the rows starting at the specified index. The first row of the original query result set is at index...

Read from stdio and print out rot13: import java.io.BufferedReader; import java.io.I... The ROT13 translated Fourth Amendment reads: Gur evtug bs gur crbcyr gb or frpher va gurve crefbaf, ubhfrf, cncref, naq rssrpgf, ntnvafg haernfbanoyr frnepurf naq frvmherf, funyy abg or ivbyngrq, naq ab Jneenagf funyy vffhr, ohg hcba cebonoyr pnhfr, fhccbegrq ol Bngu be nssvezngvba, naq cnegvphyneyl qrfpevovat gur cynpr gb or frnepurq, naq gur crefbaf be guvatf gb or frvmrq.

The tags <fmt:message> Writes out a formatted message for the current locale and resource bundle, or stores the resulting message to a scoped variable (when the var attribute is specified). Syntax: <fmt:message key="messageKey" [bundle="resourc... Or, with parameters in body: <fmt:message key="messageKey" [bundle="resourc... <fmt:bundle> Creates a resource bundle for the contained body. Syntax: <fmt:bundle basename="basename" [prefix="prefi... <fmt:setBundle> Sets a resource bundle in a scoped variable, which may be used later by <fmt:message> . Syntax: <fmt:setBundle basename="basename" [var="varNa... <fmt:param> This is used inside a <fmt:message> tag to specify a replacement parameter. <fmt:param value="theParameterValue"/> or <fmt:param>The Parameter Value</fmt:param> Test it Make these additions to the expanded test application : Create 3 resource bundles and place them under src\main\resources . messages_en.properties : label.login=Login label.username=User Name ... messages_es.properties :...

This utility converts unicode escape strings in a file to UTF-8 encoded. Suppose you received a properties file with contents like: # @(#)codepoint_zh_CN.properties 1.4 05/09/27 #... You can use this utility to convert it to UTF-8 and view or edit. import java.io.*; /** * Reads file with... This utility is equivalent to: native2ascii -reverse -encoding utf-8 using the standard Java native2ascii utility.

It happened on Windows XP with JBoss 5.1.0.GA. This is the stack trace: 2010-07-30 16:39:52,177 ERROR [org.jboss.kernel.pl... According to " (SOLVED) JBAS-7674 solution for JBoss 5.1?? (Windows lock on jnp-service.url) ", the problem seemed to be solved for JBoss 6. In the meanwhile for JBoss 5, disabling Windows Indexing Service seemed to solve the problem. Quote from aforementioned link: It seemed that a file was being locked for some reason, and that file was obviously necessary for JBoss to start. Some further investigation (ok, I admit, I just tried to delete all of JBoss with the faith that it would fail on the locked file), it turns out that file was some file called jnp-service.url in the data directory of the default server. After downloading...

This is an example of using java.beans.XMLEncoder and java.beans.XMLDecoder to serialize/deserialize Java objects to XML. Java code TestXMLEncoder.java: import java.io.*; import java.beans.XMLEncoder;... SimpleBean.java: public class SimpleBean { private String na... CompositeBean.java: public class CompositeBean { private Simple... NotABean.java: public class NotABean { private String name... Test Output By default, only Java beans can be serialized using XMLEncoder . Exception occurs when you try to deserialize an object which is not a Java bean. Errors actually occur when you try to serialize, but they are ignored. As a result, an XML file is generated by the serialization but the file is useless! Console output: C:\>java TestXMLEncoder Testing simple bean ... simplebean.xml: <?xml version="1.0" encoding="UTF-8"?> <java v... compositebean.xml: <?xml version="1.0" encoding="UTF-8"?> <java v... nodefault.xml: <?xml version="1.0" encoding="UTF-8"?> <java v......