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It has always bothered me that the only way to copy a file in Java involves opening streams, declaring a buffer, reading in one file, looping through it, and writing it out to the other steam. The web is littered with similar, yet still slightly different implementations of this type of solution. Is there a better way that stays within the bounds of the Java language (meaning does not involve exec-ing OS specific commands)? Perhaps in some reliable open source utility package, that would at least obscure this underlying implementation and provide a one line solution?
Standard concise way to copy a file in Java? - Stack Overflow
Orion SSH2 is a library which implements the SSH-2 protocol in pure Java. It allows one to connect to SSH servers from within Java programs, for: Orion SSH2 is a community-driven project derived from Trilead SSH2 and Ganymed SSH2 code.
orion-ssh2
Check the class version - Real's Java How-to
Check the class version Tag(s): Environment The first 4 bytes are a magic number, 0xCAFEBABe, to identify a valid class file then the next 2 bytes identify the class format version (major and minor). The values of the minor_version and major_version items are the minor and major version numbers of this class file.Together, a major and a minor version number determine the version of the class file format. If a class file has major version number M and minor version number m, we denote the version of its class file format as M.m. Thus, class file format versions may be ordered lexicographically, for example, 1.5 A Java virtual machine implementation can support a class file format of version v if and only if v lies in some contiguous range Mi.0 v Mj.m.
JD | Java Decompiler
The “Java Decompiler project” aims to develop tools in order to decompile and analyze Java 5 “byte code” and the later versions. JD-Core is a library that reconstructs Java source code from one or more “.class” files. JD-Core may be used to recover lost source code and explore the source of Java runtime libraries. New features of Java 5, such as annotations, generics or type “enum”, are supported.
Every application needs logging, it can help you during development and when debugging those annoying things that do not work in production. One question is where to put the logging events. All linux servers use a system log to log events that take place on the operating system level. You can find logs for the kernel, deamons, user actions and a lot of other items. The nice part about system logging is that maintenance people will always know where to look and that it is possible to use one server for logging. At the moment I am on a project that uses a fair amount of servers.
Logging to the syslog from a java application « JTeam Blog / JTeam: Enterprise Java, Open Source, software solutions, Amsterdam
November 2008 This document is a guide to help troubleshoot problems that might arise with applications that are developed using the release of Java Platform, Standard Edition 6 (JDK 6 release or Java SE 6 release). In particular, this guide addresses possible problems between the applications and the Java HotSpot virtual machine.
Troubleshooting System Crashes - Troubleshooting Guide for Java SE 6 with HotSpot VM
If the procedure takes one second (wall-clock time) to complete, then it is going to take one thousand seconds (over 16½ minutes) to complete this task. That would take one hundred seconds (just over 1½ minutes), one tenth of the original time. The more CPU's available, the faster the result. This is what scientific computing is all about — simultaneously processing humongous amounts of data on as many CPU’s as available. This abstraction closely resembles the standard scientific model of Divide-and-Conquer.
Fork-Join Development in Java SE
The default read-only state of connections created by this pool. If not set then the setReadOnly method will not be called. (Some drivers don't support read only mode, ex: Informix) The maximum number of milliseconds that the pool will wait (when there are no available connections) for a connection to be returned before throwing an exception, or -1 to wait indefinitely. NOTE : If maxIdle is set too low on heavily loaded systems it is possible you will see connections being closed and almost immediately new connections being opened. This is a result of the active threads momentarily closing connections faster than they are opening them, causing the number of idle connections to rise above maxIdle.
DBCP - Configuration
Java Notes . These Java programming notes are written to fill in missing or weak topics in textbooks that I've taught from. Many pages are useful for reference, but not as an ordered tutorial. Some pages are still rough drafts, but I'm slowly working on fixing them. notes-java- 2007-04-25 .zip [2.4 MB]. Java Basics .
Java Programming Notes
Understanding Weak References | Java.net
Posted by enicholas on May 4, 2006 at 7:06 PM CDT Some time ago I was interviewing candidates for a Senior Java Engineer position. Among the many questions I asked was "What can you tell me about weak references?" I wasn't expecting a detailed technical treatise on the subject.