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Introduction to Java
Introduction to Java James Brucker What is Java? Java is a language for writing computer programs. it runs on almost any "computer". desktop mobile phones game box web server & web apps smart devices What Uses Java? OpenOffice & LibreOffice (like Microsoft Office) Firefox Google App Engine Android MindCraft & Greenfoot IDE: Eclipse, IntelliJ, NetBeans How Java Works: Compiling 1. You (programmer) write source code in Java. 2. A compiler (javac) checks the code and translates it into "byte code" for a "virtual machine". Java Java source Hello.java javac Hello.class byte code code compiler public class Hello { public Hello(); aload_0 public static void main( String [ ] args ) { invokespecial #1; //Method java/ System.out.println( "I LOVE programming" ); lang/Object."<init>":()V return } main(java.lang.String[]); } getstatic #2; //Field ... How Java Works: Run the Bytecode 3. Run the byte code in a Java Virtual Machine (JVM). 4. The JVM (java command) interprets the byte code and loads other code from libraries as needed. Java I LOVE programming byte Hello.class java code java virtual public Hello(); aload_0 machine invokespecial #1; //Method java/lang/Object."<init>":()V return main(java.lang.String[]); Other java classes, getstatic #2; //Field ... saved in libraries. Summary: How Java Works 1. You (programmer) write program source code in Java. 2. Java compiler checks the code and translates it into "byte code". 3. A Java virtual machine (JVM) runs the byte code. Libraries Hello, javac Hello.class java Hello.java World! Java compiler byte code JVM: Program source - load byte code execution program - verify the code - runs byte code - enforce security model How to Write Source Code? You can use any editor to write the Java source code. -
Configuring & Using Apache Tomcat 4 a Tutorial on Installing and Using
Configuring & Using Apache Tomcat 4 A Tutorial on Installing and Using Tomcat for Servlet and JSP Development Taken from Using-Tomcat-4 found on http://courses.coreservlets.com Following is a summary of installing and configuring Apache Tomcat 4 for use as a standalone Web server that supports servlets 2.3 and JSP 1.2. Integrating Tomcat as a plugin within the regular Apache server or a commercial Web server is more complicated (for details, see http://jakarta.apache.org/tomcat/tomcat-4.0-doc/). Integrating Tomcat with a regular Web server is valuable for a deployment scenario, but my goal here is to show how to use Tomcat as a development server on your desktop. Regardless of what deployment server you use, you'll want a standalone server on your desktop to use for development. (Note: Tomcat is sometimes referred to as Jakarta Tomcat since the Apache Java effort is known as "The Jakarta Project"). The examples here assume you are using Windows, but they can be easily adapted for Solaris, Linux, and other versions of Unix. I've gotten reports of successful use on MacOS X, but don't know the setup details. Except when I refer to specific Windows paths (e.g., C:\blah\blah), I use URL-style forward slashes for path separators (e.g., install_dir/webapps/ROOT). Adapt as necessary. The information here is adapted from More Servlets and JavaServer Pages from Sun Microsystems Press. For the book table of contents, index, source code, etc., please see http://www.moreservlets.com/. For information on servlet and JSP training courses (either at public venues or on-site at your company), please see http://courses.coreservlets.com. -
Solutions to Exercises
533 Appendix Solutions to Exercises Chapters 1 through 10 close with an “Exercises” section that tests your understanding of the chapter’s material through various exercises. Solutions to these exercises are presented in this appendix. Chapter 1: Getting Started with Java 1. Java is a language and a platform. The language is partly patterned after the C and C++ languages to shorten the learning curve for C/C++ developers. The platform consists of a virtual machine and associated execution environment. 2. A virtual machine is a software-based processor that presents its own instruction set. 3. The purpose of the Java compiler is to translate source code into instructions (and associated data) that are executed by the virtual machine. 4. The answer is true: a classfile’s instructions are commonly referred to as bytecode. 5. When the virtual machine’s interpreter learns that a sequence of bytecode instructions is being executed repeatedly, it informs the virtual machine’s Just In Time (JIT) compiler to compile these instructions into native code. 6. The Java platform promotes portability by providing an abstraction over the underlying platform. As a result, the same bytecode runs unchanged on Windows-based, Linux-based, Mac OS X–based, and other platforms. 7. The Java platform promotes security by providing a secure environment in which code executes. It accomplishes this task in part by using a bytecode verifier to make sure that the classfile’s bytecode is valid. 8. The answer is false: Java SE is the platform for developing applications and applets. 533 534 APPENDIX: Solutions to Exercises 9. -
Encryption Introduction to Using 7-Zip
IT Services Training Guide Encryption Introduction to using 7-Zip It Services Training Team The University of Manchester email: [email protected] www.itservices.manchester.ac.uk/trainingcourses/coursesforstaff Version: 5.3 Training Guide Introduction to Using 7-Zip Page 2 IT Services Training Introduction to Using 7-Zip Table of Contents Contents Introduction ......................................................................................................................... 4 Compress/encrypt individual files ....................................................................................... 5 Email compressed/encrypted files ....................................................................................... 8 Decrypt an encrypted file ..................................................................................................... 9 Create a self-extracting encrypted file .............................................................................. 10 Decrypt/un-zip a file .......................................................................................................... 14 APPENDIX A Downloading and installing 7-Zip ................................................................. 15 Help and Further Reference ............................................................................................... 18 Page 3 Training Guide Introduction to Using 7-Zip Introduction 7-Zip is an application that allows you to: Compress a file – for example a file that is 5MB can be compressed to 3MB Secure the -
Enterprise Search Technology Using Solr and Cloud Padmavathy Ravikumar Governors State University
Governors State University OPUS Open Portal to University Scholarship All Capstone Projects Student Capstone Projects Spring 2015 Enterprise Search Technology Using Solr and Cloud Padmavathy Ravikumar Governors State University Follow this and additional works at: http://opus.govst.edu/capstones Part of the Databases and Information Systems Commons Recommended Citation Ravikumar, Padmavathy, "Enterprise Search Technology Using Solr and Cloud" (2015). All Capstone Projects. 91. http://opus.govst.edu/capstones/91 For more information about the academic degree, extended learning, and certificate programs of Governors State University, go to http://www.govst.edu/Academics/Degree_Programs_and_Certifications/ Visit the Governors State Computer Science Department This Project Summary is brought to you for free and open access by the Student Capstone Projects at OPUS Open Portal to University Scholarship. It has been accepted for inclusion in All Capstone Projects by an authorized administrator of OPUS Open Portal to University Scholarship. For more information, please contact [email protected]. ENTERPRISE SEARCH TECHNOLOGY USING SOLR AND CLOUD By Padmavathy Ravikumar Masters Project Submitted in partial fulfillment of the requirements For the Degree of Master of Science, With a Major in Computer Science Governors State University University Park, IL 60484 Fall 2014 ENTERPRISE SEARCH TECHNOLOGY USING SOLR AND CLOUD 2 Abstract Solr is the popular, blazing fast open source enterprise search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, near real-time indexing, dynamic clustering, database in9tegration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly reliable, scalable and fault tolerant, providing distributed indexing, replication and load-balanced querying, automated failover and recovery, centralized configuration and more. -
Pack, Encrypt, Authenticate Document Revision: 2021 05 02
PEA Pack, Encrypt, Authenticate Document revision: 2021 05 02 Author: Giorgio Tani Translation: Giorgio Tani This document refers to: PEA file format specification version 1 revision 3 (1.3); PEA file format specification version 2.0; PEA 1.01 executable implementation; Present documentation is released under GNU GFDL License. PEA executable implementation is released under GNU LGPL License; please note that all units provided by the Author are released under LGPL, while Wolfgang Ehrhardt’s crypto library units used in PEA are released under zlib/libpng License. PEA file format and PCOMPRESS specifications are hereby released under PUBLIC DOMAIN: the Author neither has, nor is aware of, any patents or pending patents relevant to this technology and do not intend to apply for any patents covering it. As far as the Author knows, PEA file format in all of it’s parts is free and unencumbered for all uses. Pea is on PeaZip project official site: https://peazip.github.io , https://peazip.org , and https://peazip.sourceforge.io For more information about the licenses: GNU GFDL License, see http://www.gnu.org/licenses/fdl.txt GNU LGPL License, see http://www.gnu.org/licenses/lgpl.txt 1 Content: Section 1: PEA file format ..3 Description ..3 PEA 1.3 file format details ..5 Differences between 1.3 and older revisions ..5 PEA 2.0 file format details ..7 PEA file format’s and implementation’s limitations ..8 PCOMPRESS compression scheme ..9 Algorithms used in PEA format ..9 PEA security model .10 Cryptanalysis of PEA format .12 Data recovery from -
High Performance with Distributed Caching
High Performance with Distributed Caching Key Requirements For Choosing The Right Solution High Performance with Distributed Caching: Key Requirements for Choosing the Right Solution Table of Contents Executive summary 3 Companies are choosing Couchbase for their caching layer, and much more 3 Memory-first 4 Persistence 4 Elastic scalability 4 Replication 5 More than caching 5 About this guide 5 Memcached and Oracle Coherence – two popular caching solutions 6 Oracle Coherence 6 Memcached 6 Why cache? Better performance, lower costs 6 Common caching use cases 7 Key requirements for an effective distributed caching solution 8 Problems with Oracle Coherence: cost, complexity, capabilities 8 Memcached: A simple, powerful open source cache 10 Lack of enterprise support, built-in management, and advanced features 10 Couchbase Server as a high-performance distributed cache 10 General-purpose NoSQL database with Memcached roots 10 Meets key requirements for distributed caching 11 Develop with agility 11 Perform at any scale 11 Manage with ease 12 Benchmarks: Couchbase performance under caching workloads 12 Simple migration from Oracle Coherence or Memcached to Couchbase 13 Drop-in replacement for Memcached: No code changes required 14 Migrating from Oracle Coherence to Couchbase Server 14 Beyond caching: Simplify IT infrastructure, reduce costs with Couchbase 14 About Couchbase 14 Caching has become Executive Summary a de facto technology to boost application For many web, mobile, and Internet of Things (IoT) applications that run in clustered performance as well or cloud environments, distributed caching is a key requirement, for reasons of both as reduce costs. performance and cost. By caching frequently accessed data in memory – rather than making round trips to the backend database – applications can deliver highly responsive experiences that today’s users expect. -
Final Report CS 5604: Information Storage and Retrieval
Final Report CS 5604: Information Storage and Retrieval Solr Team Abhinav Kumar, Anand Bangad, Jeff Robertson, Mohit Garg, Shreyas Ramesh, Siyu Mi, Xinyue Wang, Yu Wang January 16, 2018 Instructed by Professor Edward A. Fox Virginia Polytechnic Institute and State University Blacksburg, VA 24061 1 Abstract The Digital Library Research Laboratory (DLRL) has collected over 1.5 billion tweets and millions of webpages for the Integrated Digital Event Archiving and Library (IDEAL) and Global Event Trend Archive Research (GETAR) projects [6]. We are using a 21 node Cloudera Hadoop cluster to store and retrieve this information. One goal of this project is to expand the data collection to include more web archives and geospatial data beyond what previously had been collected. Another important part in this project is optimizing the current system to analyze and allow access to the new data. To accomplish these goals, this project is separated into 6 parts with corresponding teams: Classification (CLA), Collection Management Tweets (CMT), Collection Management Webpages (CMW), Clustering and Topic Analysis (CTA), Front-end (FE), and SOLR. This report describes the work completed by the SOLR team which improves the current searching and storage system. We include the general architecture and an overview of the current system. We present the part that Solr plays within the whole system with more detail. We talk about our goals, procedures, and conclusions on the improvements we made to the current Solr system. This report also describes how we coordinate with other teams to accomplish the project at a higher level. Additionally, we provide manuals for future readers who might need to replicate our experiments. -
An Unobtrusive, Scalable Approach to Large Scale Software License Analysis
DRAT: An Unobtrusive, Scalable Approach to Large Scale Software License Analysis Chris A. Mattmann1,2, Ji-Hyun Oh1,2, Tyler Palsulich1*, Lewis John McGibbney1, Yolanda Gil2,3, Varun Ratnakar3 1Jet Propulsion Laboratory 2Computer Science Department 3USC Information Sciences Institute California Institute of Technology University of Southern California University of Southern California Pasadena, CA 91109 USA Los Angeles, CA 90089 USA Marina Del Rey, CA [email protected] {mattmann,jihyuno}@usc.edu {gil,varunr}@ isi.edu Abstract— The Apache Release Audit Tool (RAT) performs (OSI) for complying with open source software open source license auditing and checking, however definition, however, there exist slight differences among these RAT fails to successfully audit today's large code bases. Being a licenses [2]. For instance, GPL is a “copyleft” license that natural language processing (NLP) tool and a crawler, RAT only allows derivative works under the original license, marches through a code base, but uses rudimentary black lists whereas MIT license is a “permissive” license that grants the and white lists to navigate source code repositories, and often does a poor job of identifying source code versus binary files. In right to sublicense the code under any kind of license [2]. This addition RAT produces no incremental output and thus on code difference could affect architectural design of the software. bases that themselves are "Big Data", RAT could run for e.g., a Furthermore, circumstances are more complicated when month and still not provide any status report. We introduce people publish software under the multiple licenses. Distributed "RAT" or the Distributed Release Audit Tool Therefore, an automated tool for verifying software licenses in (DRAT). -
White Paper Using Hazelcast with Microservices
WHITE PAPER Using Hazelcast with Microservices By Nick Pratt Vertex Integration June 2016 Using Hazelcast with Microservices Vertex Integration & Hazelcast WHITE PAPER Using Hazelcast with Microservices TABLE OF CONTENTS 1. Introduction 3 1.1 What is a Microservice 3 2. Our experience using Hazelcast with Microservices 3 2.1 Deployment 3 2.1.1 Embedded 4 2.2 Discovery 5 2.3 Solving Common Microservice Needs with Hazelcast 5 2.3.1 Multi-Language Microservices 5 2.3.2 Service Registry 5 2.4 Complexity and Isolation 6 2.4.1 Data Storage and Isolation 6 2.4.2 Security 7 2.4.3 Service Discovery 7 2.4.4 Inter-Process Communication 7 2.4.5 Event Store 8 2.4.6 Command Query Responsibility Segregation (CQRS) 8 3. Conclusion 8 TABLE OF FIGURES Figure 1 Microservices deployed as HZ Clients (recommended) 4 Figure 2 Microservices deployed with embedded HZ Server 4 Figure 3 Separate and isolated data store per Service 6 ABOUT THE AUTHOR Nick Pratt is Managing Partner at Vertex Integration LLC. Vertex Integration develops and maintains software solutions for data flow, data management, or automation challenges, either for a single user or an entire industry. The business world today demands that every business run at maximum efficiency.T hat means reducing errors, increasing response time, and improving the integrity of the underlying data. We can create a product that does all those things and that is specifically tailored to your needs. If your business needs a better way to collect, analyze, report, or share data to maximize your profitability, we can help. -
Alfresco Enterprise on AWS: Reference Architecture October 2013
Amazon Web Services – Alfresco Enterprise on AWS: Reference Architecture October 2013 Alfresco Enterprise on AWS: Reference Architecture October 2013 (Please consult http://aws.amazon.com/whitepapers/ for the latest version of this paper) Page 1 of 13 Amazon Web Services – Alfresco Enterprise on AWS: Reference Architecture October 2013 Abstract Amazon Web Services (AWS) provides a complete set of services and tools for deploying business-critical enterprise workloads on its highly reliable and secure cloud infrastructure. Alfresco is an enterprise content management system (ECM) useful for document and case management, project collaboration, web content publishing and compliant records management. Few classes of business-critical applications touch more enterprise users than enterprise content management (ECM) and collaboration systems. This whitepaper provides IT infrastructure decision-makers and system administrators with specific technical guidance on how to configure, deploy, and run an Alfresco server cluster on AWS. We outline a reference architecture for an Alfresco deployment (version 4.1) that addresses common scalability, high availability, and security requirements, and we include an implementation guide and an AWS CloudFormation template that you can use to easily and quickly create a working Alfresco cluster in AWS. Introduction Enterprises need to grow and manage their global computing infrastructures rapidly and efficiently while simultaneously optimizing and managing capital costs and expenses. The computing and storage services from AWS meet this need by providing a global computing infrastructure as well as services that simplify managing infrastructure, storage, and databases. With the AWS infrastructure, companies can rapidly provision compute capacity or quickly and flexibly extend existing on-premises infrastructure into the cloud. -
Hot Technologies” Within the O*NET® System
Identification of “Hot Technologies” within the O*NET® System Phil Lewis National Center for O*NET Development Jennifer Norton North Carolina State University Prepared for U.S. Department of Labor Employment and Training Administration Office of Workforce Investment Division of National Programs, Tools, & Technical Assistance Washington, DC April 4, 2016 www.onetcenter.org National Center for O*NET Development, Post Office Box 27625, Raleigh, NC 27611 Table of Contents Background ......................................................................................................................... 2 Hot Technologies Identification Procedure ...................................................................... 3 Mine data to collect the top technology related terms ................................................ 3 Convert the data-mined technology terms into O*NET technologies ......................... 3 Organize the hot technologies within the O*NET Tools & Technology Taxonomy ..... 4 Link the hot technologies to O*NET-SOC occupations .............................................. 4 Determine the display of occupations linked to a hot technology ............................... 4 Summary ............................................................................................................................. 5 Figure 1: O*NET Hot Technology Icon .............................................................................. 6 Appendix A: Hot Technologies Identified During the Initial Implementation ................ 7 National Center