Articles by Deepak Vohra

Integrated Support for XML Data Management

Wed, 11 Jun 2008 14:00:00 EDT

XML is increasingly being used as the language of data exchange. An XML document based on a DTD or an XML Schema contains data that conforms to a standard structure. A number of technologies, such as ebXML (Electronic Business XML), UDDI (Universal Description, Discovery, and Integration), and RDF (Resource Description Framework) are based on XML.

How to Create a Directory Service Using the OpenLDAP Directory Server

Sun, 15 Jul 2007 16:00:00 EDT

A directory service is an application(s) that stores, retrieves, and modifies information about network resources such as network users. The actual data is stored in a database; a database service is an abstract layer on top of the database. The Lightweight Directory Access Protocol (LDAP) is a lightweight protocol for accessing directory services. LDAP is based on entries; an entry is a set of attributes identified by a globally unique Distinguished Name (DN). Each of a directory entry's attributes has a type and one or more values. The attributes in a directory entry's distinguished name(DN) are arranged in a hierarchy from right to left with the rightmost attribute as the top entry and with the leftmost attribute(s) that are unique to its level called a Relative Distinguished Name (RDN). A DN is a sequence of RDNs. Some examples of attribute types are discussed in Table 1.

JDJ Feature — Java API for XML Web Services (JAX-WS)

Wed, 27 Jun 2007 15:00:00 EDT

WebLogic Server 10 Technology Preview supports JEE 5. A feature of JEE 5 is the Java API for XML Web Services (JAX-WS) used to create Web Services and Web Service clients. WebLogic Server 10 provides the jwsc task to create the Web Service artifacts and the clientgen task to create the artifacts for Web Service clients. In this article we'll create an example JAX-WS 2.0 Web Service in WebLogic Server 10 Technology Preview.

Configuring WebLogic Server 9.x JDBC

Tue, 30 Jan 2007 16:00:00 EST

WebLogic Server 9.x provides database connectivity with data sources. A data source is a pool of database connections from which a connection can be obtained. A data source can be configured separately or as a multi-datasource. A multi-data source is collection of data sources. A data source is configured with a JNDI binding. A DataSource object is obtained with a JNDI lookup. A Connection object can be obtained from a DataSource object with the getConnection() method. WebLogic Server provides an administration console to configure a data source. WebLogic Server 9.x includes Type 4 JDBC drivers from DataDirect for DB2, Informix, Microsoft SQL Server, Sybase, and Oracle databases. JDBC drivers for other databases can be incorporated in the server by including the JAR files for the JDBC drivers in the server classpath.

Configuring the WebLogic-Eclipse Plug-in

Wed, 09 Aug 2006 10:45:00 EDT

The WebLogic-Eclipse plug-in is designed to run the WebLogic Server from the Eclipse IDE. With the WebLogic-Eclipse plug-in, the WebLogic Server gets started and stopped from Eclipse. An application deployed in the WebLogic Server can be debugged from Eclipse with the plug-in. By installing the WebLogic plug-in in Eclipse the WebLogic Server can be configured and administered from the Eclipse IDE by setting the server classpath and JVM options in Eclipse.

WebLogic Tutorial: "Integrating Apache Poi in WebLogic Server"

Sun, 19 Feb 2006 14:30:00 EST

The Apache Jakarta POI project provides components for the access and generation of Excel documents. The POI HSSF API is used to generate Excel Workbooks and to add Excel spreadsheets to a workbook. An Excel spreadsheet consists of rows and cells. The layout and fonts of a spreadsheet are also set with the POI HSSF API.

Configuring Eclipse for Remote Debugging a WebLogic Java Application

Wed, 18 Jan 2006 18:00:00 EST

A J2EE application deployed in the WebLogic server may be debugged in the Eclipse IDE with the remote debugger provided by Eclipse. Without a debugger the error message has to be obtained from the application server error log to debug the application.

Migrating a JBoss EJB Application to WebLogic

Mon, 08 Aug 2005 12:00:00 EDT

The JBoss open source application server is commonly used in the development phase of a J2EE project. In the production phase the commercial BEA WebLogic server is preferred because of its enhanced set of features. Without modifications, an application developed in JBoss does not deploy in WebLogic server.

Transforming XML-to-XML or -Text or -HTML

Fri, 18 Mar 2005 00:00:00 EST

The Extensible Stylesheet Language Transformations (XSLT) specification provides for morphing XML documents into other XML documents. An XML document can also be transformed into a format other than XML such as HTML or text. An XSLT processor is required for an XSLT transformation. Some of the commonly used XSLT processors include Xalan-Java, Oracle XSLT Processor for Java and the JAXP XSLT transformer. A stylesheet is used to transform an XML document.

XML Schema Binding with XMLBeans

Tue, 04 Jan 2005 00:00:00 EST

XMLBeans is an open source XML-Java binding tool used to generate Java classes and interfaces from an XML Schema. The generated Java classes may be used to parse or generate an XML document that conforms to the Schema. Some of the advantages of XMLBeans over JAXB are the ability to parse an XML document and support for all of the XML Schema constructs; the JAXB-generated classes do not have a parse method to parse an XML document, and JAXB does not support all of the Schema constructs.

SimpleType and ComplexType in a Schema

Fri, 01 Oct 2004 00:00:00 EDT

This tutorial discusses the simpleType and complexType XML Schema structures and their corresponding representations in an XML document. XML Schema is used as the basis of an XML document structure, and some of the XML technologies, such as JAXB, are based on XML Schema.

Developing Entity EJBs

Fri, 09 Apr 2004 00:00:00 EDT

Enterprise JavaBeans (EJBs) are application components that implement the EJB architecture specification and are part of the Java 2 Enterprise Edition (J2EE) platform. EJBs are ideally suited for the development and deployment of distributed, scalable, transactional, secure, portable, component-based business applications.

DTD and XML Schema Structures

Wed, 10 Mar 2004 00:00:00 EST

This article compares Document Type Definition (DTD) and XML Schema elements. Java 2 Enterprise Edition (J2EE) developers use DTDs and schemas in J2EE/XML applications. When a DTD for an XML document is provided and validation with an XML Schema is required, the DTD-to-XML Schema conversion creates an XML Schema document corresponding to the DTD document.

Configuring BEA WebLogic 8.1 JDBC Connectivity

Fri, 09 Jan 2004 00:00:00 EST

This article describes the configuration of various JDBC-related features in the BEA WebLogic 8.1 Server. Although we use Oracle 8.1.7 as our example database management system (DBMS), the general concepts are easily transferable to other relational databases as long as the databases in question provide connectivity through JDBC.