Welcome!

Java IoT Authors: Elizabeth White, Liz McMillan, Pat Romanski, Carmen Gonzalez, Yeshim Deniz

Related Topics: Java IoT

Java IoT: Article

Reporting Made Easy with JasperReports and Hibernate

JasperReports and Hibernate in Web applications

JasperReports is a valuable and viable reporting solution for Java Web applications. It simplifies report generation through the use of XML report templates that are then compiled using the JasperReports engine for use in reporting modules. These compiled report templates can be filled by data received from a variety of sources including relational databases. JasperReports can be integrated into Web applications and create reports in several file formats including PDF and XLS.

Reporting in Java Applications
Often reporting modules increase in complexity and size during the course of application development. Clients tend to demand more information from report modules when they become aware of the benefits reports offer. The reporting module developed as something of an afterthought in such environments suddenly becomes a much more integral part of the application. Reporting modules often seem to be tacked on to developed applications, rather than being considered and implemented during initial application development.

Recently while working on some applications that made extensive use of report extraction to XLS files using the Apache POI library, it became apparent that these report modules tied up lots of valuable development resources for extended periods of time. When the client requested PDF extraction, initial iText API research led me to discover JasperReports. JasperReports was to change our team approach to report development dramatically.

Prior to implementing JasperReports each report creation required the development of a custom report class using the Apache POI library. This approach expended valuable development time creating aspects of the report such as cell specific formats, styles, and population methods. JasperReports offered our team the ability to get back this valuable development time, while producing the same report because of its embedded use of the Apache POI library.

One of the benefits offered by the introduction of JasperReports is that a single report template implementation can produce reports in a number of formats. This means that templates created for XLS format extraction can also be used to produce PDF files and even CSV, HTML or XML.

How Can JasperReports Help Developers?
JasperReports gives developers the ability to create reports quickly and easily that can be extracted to numerous formats. Developers can also use the JasperReports engine to compile report templates at design or runtime - allowing dynamic report formats. Developers can also inject data into these reports from a number of data sources. Developer time no longer has to be spent creating custom report classes using the Apache POI or iText libraries for formatting and stylizing reports, allowing the code writers to focus on the data retrieval aspect of the report. As a result developers gain valuable flexibility and time savings using JasperReports in application development.

The XML report templates used by JasperReports provide the layout and presentation information required to format the resulting report as well as field, variable, and parameter references. Non-development staff can create these templates using a third-party GUI such as iReport with minimal developer collaboration, so developers don't have to involve themselves in the layout and presentation aspect of report generation.

JasperReports enables developers to concentrate their efforts on the parts of the reporting module where they are required, while relieving them of having to write custom report generation code. A developer's role in the report module can be reduced to template compilation, data source implementation, and actual report creation.

Creating and Compiling an XML Report Template
JasperReports requires a report design defining the layout, presentation, and data fields. This design can be built using the net.sf.jasperreports.engine.design.JasperDesign object, so developers can create report designs dynamically, or by creating a net.sf.jasperreports.engine.design.JasperDesign instance from an XML report template. Unless an application specifically requires a dynamic layout a compiled XML report template is the recommended method. This XML template is usually saved with a .jrxml file extension and compiled using the net.sf.jasperreports.engine.JasperCompileManager.

The JasperReports XML template includes elements for <title>, <pageHeader>, <columnHeader>, <pageFooter>, <columnFooter>, and the main data <detail> element. Each of these elements has a variety of sub-elements as can be seen in sampleReport.jrxml (see Listing 1).

You can download the code samples used in this article at jdj.sys-con.com. As can be seen in sampleReport.jrxml some elements such as <band> and <reportElement> contain layout information, while others such as <textElement> and <font> contain presentation information. The XML templates also contain <parameter>, <field>, and <variable> elements used to include data in the report.

The <parameter> elements allow non-data source information to be passed into a report, such as a dynamic title; <field> elements are the only way to map report fields to the data source fields, while variables are values generated at runtime for use in the report. The complete Document Type Definition (DTD) for the JasperReports XML report template can be found in the JasperReports Ultimate Guide.

Compilation of the XML template can be done either at runtime or build time as part of an Ant build using the JasperReports Ant task.

Compiling the report at runtime entails loading the report into a JasperDesign object and using the created instance as the parameter to the JasperCompileManager.compileReport(JasperDesign design) method, which returns a JasperReport instance. Alternatively the XML template can be passed into the JasperCompileManager.compileToFileReport(String sourceFileName, which creates a compiled report file (.jasper) available throughout the application.

Compiling the report at build time using the JasperReports Ant task requires the addition of the task definition to the build.xml file and a target making use of this task as seen in Listing 2, which is an extract from the source code build.xml. Using the Ant task results in the creation of a compiled (.jasper) file in the destdir task and offers the opportunity to save the Java source file by passing the keepjava attribute of the target a true value. A more thorough example of how to use the Ant task is included in the sample applications provided in the JasperReports download bundle.

Using Data Sources to Fill JasperReports
Most reports use a database as the data source, but JasperReports can use any available data source. These data sources are passed to a net.sf.jasperreports.engine.JasperFillManager fillReportXXX() method. Two types of data source are provided for by these methods - net.sf.jasperreports.engine.JRDataSource and java.sql.Connection. The source code for this article contains examples of both a static data source that extends the JRDataSource and a JDBC connection data source implementation.

The StaticDataSource class implementation provided implements the net.sf.jasperreports.engine.JRDataSource interface enabling it to fill the report data by calling the JasperFillManager.fillReport(JaperReport report, Map parameters, JRDataSource dataSource) method. The two required methods getFieldValue(JRField jrField) and next() of the JRDataSource interface present in StaticDataSource handle the data passing from the data source into the JasperReport. The data source used by StaticDataSource is a static simple two-dimensional array of bowlers containing their names and scores over three games (see Listing 3). When the fillReport() method containing this data source is processed and a detail section is encountered in the report a call will be made to the next() method. The implementation of this method in StaticDataSource (see Listing 4) returns true if there's another element in the data array, or false if there is no more data. If this method returns true then field elements encountered in the detail section will result in a call to the getFieldValue(JRField jrField) method in StaticDataSource. The implementation of this method in StaticDataSource (see Listing 5) returns the value of the mapped data field name for the current index of the data array. When the end of the detail section is encountered, the next() method is called again and the process repeats until the next() method returns false.

The JDBCDataSourceExample (see Listing 6) implements a fillReport() method that accepts a java.sql.Connection parameter. Through the addition of a <queryString> element into the XML report template (jdbcSampleReport.jrxml) this fillReport() method enables data to be extracted from a relational database. The <queryString> element returns the data fields for use in the report data mapping. In this case the query simply returns all records in the sample_data table. A java.sql.ResultSet can be used instead of implementing the <queryString> element in the report template, allowing dynamic query implementation.

Using Hibernate with JasperReports
Hibernate is one of the most popular ORM tools in use at the moment. Using Hibernate as a data source for JasperReports can be very simple when a collection of objects is returned from a Hibernate query, but when a tuple of objects is returned then a custom JRDataSource implementation is required.

When a Hibernate query returns a collection of objects, a net.sf.jasperreports.engine.data.JRBeanCollection-DataSource can be used to map the Hibernate POJO instance fields to the report fields. All that's required for this simple solution is to use the JRBeanCollectionDataSource(java.util.Collection beanCollection) constructor, passing it the Hibernate Query result set as implemented in SimpleHibernateExample (see Listing 7). In this example the simple Hibernate query used (session.createQuery("from SampleData").list()) is equivalent to that found in the JDBCDataSourceExample. JRBeanCollectionDataSource implements JRDataSource like StaticDataSource but its getFieldValue(JRField jrField) method implementation maps the report template field names to the query result bean properties.

When a Hibernate query returns a tuple of objects it's necessary to write a custom implementation of the JRDataSource similar to HibernateDataSource (see Listing 8). The implementation of the required next() method in this class returns true if there is another list item in the Hibernate query result set, while putting the current list item in a currentValue holder for use in the getFieldValue(JRField jrField) method. The getFieldValue() method implementation gets the field index in the currentValue object via a call to the getFieldIndex(String field) method. This method iterates through the mapped field names passed to the HibernateDataSource constructor until it finds the field name it was passed and then returns the index of this field in the currentValue information. The getFieldValue() method then returns the value at this index in the currentValue result object.

More Stories By Peter Sellars

Peter Sellars is the lead devloper at Netbyte Internet Ltd
(www.netbyte.com) in Auckland, New Zealand. His main interests are project
automation and application architecture. He aims to simplify developer jobs by
implementing tools that enable them to utilise their time better. He
enjoys playing soccer and tenpin bowling.

Comments (8) View Comments

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


Most Recent Comments
Abhilash.T.G 10/01/07 10:40:22 AM EDT

Very informative at the same time simple presentation.

Rob K 02/27/06 09:00:51 PM EST

ant build runs (compiles) the reports, looks like directory tree good from build, but doesn't create a .war file?

anyone offer assistance?

also, anyone figure out how to run this under ireport 1.1 and hibernate v3?

thanks
rob

Rob K 02/27/06 01:26:22 PM EST

seems to be very 'glossed' over in terms of what versions of the products are used or setup...

1. like why is this hibernate v2 and not v3?
2. what versions of jasper & ireport are being used?
3. how is a datasource configured for hibernate via ireport?

too much missing that's beyond the code (but would love to hear the 'rest of the story')

rob

Yvonne Gevers 02/27/06 05:23:32 AM EST

Hi,

If I want to put the result of the example into a jsp page, but I don't know how to do this. Can you give me an example of this?

Thank you.

Yvonne

James Nixon 02/20/06 03:39:19 PM EST

http://res.sys-con.com/story/jan06/171467/sellars1101.zip

I found the source by following the "See Listing 1" link on the first page.

Jose Gulisano 02/10/06 12:57:45 PM EST

Any news on source code? I t would really help given the well written article.

Thanks!!

Ashutosh Mittal 02/09/06 12:06:51 PM EST

Where to download the source code for this excellent article?

news desk 01/25/06 09:52:50 PM EST

JasperReports is a valuable and viable reporting solution for Java Web applications. It simplifies report generation through the use of XML report templates that are then compiled using the JasperReports engine for use in reporting modules. These compiled report templates can be filled by data received from a variety of sources including relational databases. JasperReports can be integrated into Web applications and create reports in several file formats including PDF and XLS.

@ThingsExpo Stories
SYS-CON Events announced today that ContentMX, the marketing technology and services company with a singular mission to increase engagement and drive more conversations for enterprise, channel and SMB technology marketers, has been named “Sponsor & Exhibitor Lounge Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York City, New York. “CloudExpo is a great opportunity to start a conversation with new prospects, but what happens after the...
WebRTC is bringing significant change to the communications landscape that will bridge the worlds of web and telephony, making the Internet the new standard for communications. Cloud9 took the road less traveled and used WebRTC to create a downloadable enterprise-grade communications platform that is changing the communication dynamic in the financial sector. In his session at @ThingsExpo, Leo Papadopoulos, CTO of Cloud9, will discuss the importance of WebRTC and how it enables companies to fo...
SYS-CON Events announced today Object Management Group® has been named “Media Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY, and the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
The IoT is changing the way enterprises conduct business. In his session at @ThingsExpo, Eric Hoffman, Vice President at EastBanc Technologies, discuss how businesses can gain an edge over competitors by empowering consumers to take control through IoT. We'll cite examples such as a Washington, D.C.-based sports club that leveraged IoT and the cloud to develop a comprehensive booking system. He'll also highlight how IoT can revitalize and restore outdated business models, making them profitable...
The IoTs will challenge the status quo of how IT and development organizations operate. Or will it? Certainly the fog layer of IoT requires special insights about data ontology, security and transactional integrity. But the developmental challenges are the same: People, Process and Platform. In his session at @ThingsExpo, Craig Sproule, CEO of Metavine, will demonstrate how to move beyond today's coding paradigm and share the must-have mindsets for removing complexity from the development proc...
Customer experience has become a competitive differentiator for companies, and it’s imperative that brands seamlessly connect the customer journey across all platforms. With the continued explosion of IoT, join us for a look at how to build a winning digital foundation in the connected era – today and in the future. In his session at @ThingsExpo, Chris Nguyen, Group Product Marketing Manager at Adobe, will discuss how to successfully leverage mobile, rapidly deploy content, capture real-time d...
What a difference a year makes. Organizations aren’t just talking about IoT possibilities, it is now baked into their core business strategy. With IoT, billions of devices generating data from different companies on different networks around the globe need to interact. From efficiency to better customer insights to completely new business models, IoT will turn traditional business models upside down. In the new customer-centric age, the key to success is delivering critical services and apps wit...
Join us at Cloud Expo | @ThingsExpo 2016 – June 7-9 at the Javits Center in New York City and November 1-3 at the Santa Clara Convention Center in Santa Clara, CA – and deliver your unique message in a way that is striking and unforgettable by taking advantage of SYS-CON's unmatched high-impact, result-driven event / media packages.
In his keynote at 18th Cloud Expo, Andrew Keys, Co-Founder of ConsenSys Enterprise, will provide an overview of the evolution of the Internet and the Database and the future of their combination – the Blockchain. Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life ...
SYS-CON Events announced today that BMC Software has been named "Siver Sponsor" of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2015 at the Javits Center in New York, New York. BMC is a global leader in innovative software solutions that help businesses transform into digital enterprises for the ultimate competitive advantage. BMC Digital Enterprise Management is a set of innovative IT solutions designed to make digital business fast, seamless, and optimized from mainframe to mo...
SYS-CON Events announced today that MobiDev will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. MobiDev is a software company that develops and delivers turn-key mobile apps, websites, web services, and complex software systems for startups and enterprises. Since 2009 it has grown from a small group of passionate engineers and business managers to a full-scale mobile software company with over 200 develope...
SoftLayer operates a global cloud infrastructure platform built for Internet scale. With a global footprint of data centers and network points of presence, SoftLayer provides infrastructure as a service to leading-edge customers ranging from Web startups to global enterprises. SoftLayer's modular architecture, full-featured API, and sophisticated automation provide unparalleled performance and control. Its flexible unified platform seamlessly spans physical and virtual devices linked via a world...
SYS-CON Events announced today that Alert Logic, Inc., the leading provider of Security-as-a-Service solutions for the cloud, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Alert Logic, Inc., provides Security-as-a-Service for on-premises, cloud, and hybrid infrastructures, delivering deep security insight and continuous protection for customers at a lower cost than traditional security solutions. Ful...
Companies can harness IoT and predictive analytics to sustain business continuity; predict and manage site performance during emergencies; minimize expensive reactive maintenance; and forecast equipment and maintenance budgets and expenditures. Providing cost-effective, uninterrupted service is challenging, particularly for organizations with geographically dispersed operations.
As cloud and storage projections continue to rise, the number of organizations moving to the cloud is escalating and it is clear cloud storage is here to stay. However, is it secure? Data is the lifeblood for government entities, countries, cloud service providers and enterprises alike and losing or exposing that data can have disastrous results. There are new concepts for data storage on the horizon that will deliver secure solutions for storing and moving sensitive data around the world. ...
SYS-CON Events announced today TechTarget has been named “Media Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY, and the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. TechTarget is the Web’s leading destination for serious technology buyers researching and making enterprise technology decisions. Its extensive global networ...
SYS-CON Events announced today that Commvault, a global leader in enterprise data protection and information management, has been named “Bronze Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY, and the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Commvault is a leading provider of data protection and information management...
SYS-CON Events announced today that MangoApps will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. MangoApps provides modern company intranets and team collaboration software, allowing workers to stay connected and productive from anywhere in the world and from any device. For more information, please visit https://www.mangoapps.com/.
The essence of data analysis involves setting up data pipelines that consist of several operations that are chained together – starting from data collection, data quality checks, data integration, data analysis and data visualization (including the setting up of interaction paths in that visualization). In our opinion, the challenges stem from the technology diversity at each stage of the data pipeline as well as the lack of process around the analysis.
Designing IoT applications is complex, but deploying them in a scalable fashion is even more complex. A scalable, API first IaaS cloud is a good start, but in order to understand the various components specific to deploying IoT applications, one needs to understand the architecture of these applications and figure out how to scale these components independently. In his session at @ThingsExpo, Nara Rajagopalan is CEO of Accelerite, will discuss the fundamental architecture of IoT applications, ...