'a Java framework for developing ops-friendly, high-performance, RESTful web services. Developed by Yammer to power their JVM-based backend services, Dropwizard pulls together stable, mature libraries from the Java ecosystem into a simple, lightweight package that lets you focus on getting things done. Dropwizard has out-of-the-box support for sophisticated configuration, application metrics, logging, operational tools, and much more, allowing you and your team to ship a production-quality HTTP+JSON web service in the shortest time possible.' From Coda Hale/Yammer; includes Guava, Jetty, Jersey, Jackson, Metrics, slf4j. Pretty good baseline to start any new Java service with....

"record entire execution of your Java app; play it back on any machine". Other features: time-travelling debugger -- step backwards, jump to any point in execution, designed for long running programs; post-execution logging -- add log statements after the program has run, and see what it would have logged. Looks extremely nifty, but I wonder how big those recording files get...

Michael Barker and Martin Thompson's talk at the last QCon on the LMAX Disruptor, and other nifty lock-free techniques and patterns. 'Martin Thompson and Michael Barker explain how Intel x86_64 processors and their memory model work, along with low-level techniques that help creating lock-free software.'

via Toby DiPasquale. nice tip

neat, Guava now has a builtin Bloom filter implementation using the murmur hash. that'll potentially save a little hassle in the future

Amazing stuff from Adrian Cockroft at last week's QCon. Faceted object model, lots of Cassandra automation

'gcprof is a simple utility for profile allocation and garbage collection activity in the JVM [...] Profile allocation and garbage collection activity in the JVM. The gcprof command runs a java command under profiling. Allocation and collection statistics are printed periodically. If -n or -no are provided, statistics are also reported in terms of the given application metric. Total allocation, allocation rate, and a survival histogram is given. The intended use for this tool is twofold: (1) monitor and test garbage allocation and GC behavior, and (2) inform GC tuning.'

'I digested a number of MapReduce patterns and algorithms to give a systematic view of the different techniques that can be found in the web or scientific articles. Several practical case studies are also provided. All descriptions and code snippets use the standard Hadoop’s MapReduce model with Mappers, Reduces, Combiners, Partitioners, and sorting.'

'GC Strategies for Event Processing Systems on the JVM'

'Eclim is less of an application and more of an integration of two great projects. The first, Vim, is arguably one of the best text editors in existence. The second, Eclipse, provides many great tools for development in various languages. Each provides many features that can increase developer productivity, but both still leave something to be desired. Vim lacks native Java support and many of the advanced features available in Eclipse. Eclipse, on the other hand, still requires the use of the mouse for many things, and when compared to Vim, provides a less than ideal interface for editing text. That is where eclim comes into play. Instead of trying to write an IDE in Vim or a Vim editor in Eclipse, eclim provides an Eclipse plug-in that exposes Eclipse features through a server interface, and a set of Vim plug-ins that communicate with Eclipse over that interface. This functionality can be leveraged in three primary ways, as illustrated below.'

Fascinating. Evading the Java GC by reimplementing a slab allocator, basically

'Backdoor that gives you a scala shell over ssh on your jvm. The shell is not sandboxed, anyone access the shell can touch anything in the jvm and do anything the jvm can do including modifying and deleting files, etc.' nifty!

a good intro from Bruce Eckel. We need a good excuse to deploy some Scala ;)

pretty good thumbs-up account

'platform for event-driven, scalable, and fault-tolerant architectures on the JVM' .. Actor-based, 'let-it-crash', Apache-licensed, Java and Scala APIs, remote Actors, transactional memory -- looks quite nice

'Preconditions, postconditions, and invariants are added as Java boolean expressions inside annotations.'  nice

ie. the same value as the PHP bug. 'Konstantin [Pressier] reported this problem to Oracle three weeks ago, but is still waiting for a reply.' good job, Oracle!

1. made him take an effective pay cut; 2. removed decision authority on Java; 3. he felt Oracle was "ethically challenged". also: 'he felt the hand of Larry Ellison in nearly all the decisions affecting Java'; “He’s the kind of person that just gives me the creeps,” he said. “All of the senior people at Sun got screwed compensation-wise. Their job titles may have been the same, but their ability to decide anything was just gone.” he doesn't pull any punches. oh dear, this is all adding up...

classic presentation from Paul Tyma of Mailinator regarding the java.nio (event-driven, non-threaded) vs java.io (threaded) model of server concurrency, backing up the scalability of threads on modern JVMs

explaining Lift's code-free "display only" templating system. I like it. Very similar concept to WebMake's "scraped templates": http://webmake.taint.org/doc/scraping.html , nearly 10 years old now!

'a Java framework made by Web developers. Discover a clean alternative to bloated enterprise Java stacks. Play focuses on developer productivity and targets RESTful architectures.'

'A variable-length format for positive integers is defined where the high-order bit of each byte indicates whether more bytes remain to be read. The low-order seven bits are appended as increasingly more significant bits in the resulting integer value. Thus values from zero to 127 may be stored in a single byte, values from 128 to 16,383 may be stored in two bytes, and so on.' UTF8-ish compression, used in Avro

'SoftReferences are the cheap, crappy caching mechanism [...] perfect for when you'd like your cache to be cleared at random times and in random order.'

a Reddit-friendly 8-point list of new idioms for Java code in a more functional style. not sure about a couple of these, but another couple get my +1