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Fastjson just fixed a bug which might cause out of memory issue

Fastjson just fixed a bug which might cause service down a few days ago. This bug is caused by some mishandling of special character \x which is an escaped character to indicate hexdecimal number. The impact of this bug would be big if the attacker constructs a malicious data which would cause the service down. The code which causes the issue is in com.alibaba.fastjson.parser.JSONLexerBase#scanString, when a JSON string is passed in, fastjson would parse the string character by c...

FASTJSON,ALIBABA,BUG,NEWS 2019-09-07 06:03:49

Difference between Enumeration and Iterator in java interview question and answer

This tutorial explains about what are the differences between Iterators and Enumeration and similarity of both interface which may be asked in a core java interview. Functionalities of both Iterator & Enumeration interfaces are similar that means both generates a series of all elements of the object which is to have its values iterated that can be traversed one at a time using next() method incase of Iterator and nextElement() method incase of Enumeration. The more powe...

Java,Iterator,Enumeration 2012-05-01 07:41:52

Why 0.1+0.2 != 0.3

In programming languages such as JavaScript, c/c++, Java and Matlab, you will find that you will get unexpected result when doing float point calculation. For example, when calculating 0.1 + 0.1, you will not get 0.3: > 0.1 + 0.2 == 0.3 false > 0.1 + 0.2 0.30000000000000004 Don't be surprised of this result, this is the end result of IEEE 754 standard, float point number cannot be accurately represented according to IEEE 754 because: No enough memory is allocated for representing the num...

float point,comparison,JavaScript 2014-11-19 05:32:46

One good way to use optional parameter in function

In GoLang, it doesn't support method overloading like in Java, hence sometimes it would be a headache to create functions to construct new structs with different parameters. Normally, we would construct the new function as below when want to let others create a new struct instance with explicit function call. type Queue struct { Name string } func NewQueue(name string) *Queue { return &Queue{name} } But with the scope and complexity of the struct increases, there might be more prope...

OPTION PATTERN,VARIADIC FUNCTION,OPTIONAL PARAMETER 2020-09-18 21:45:29

TIOBE : No news today

TIOBE released the programming index for September 2012. There is no big change for this month compared to last month, the top 3 are still C, Java and Objective-C. In top 20, only Transact-SQL exchanged the position with VB.NET. Java shows trend of drop, will it be worse because of the ignorance of Java's vulnerabilities by Oracle. This index shows that the programing lnaguage market is quite normal, no big events. Except Objective-C, in recent years there are no other new languages which have b...

TIOBE,Objective-C,Index 2012-09-05 07:36:07

Open source code libraries suffer from vulnerabilities

A study of how 31 popular open source code libraries were downloaded over the past 12 months found that more than a third of the 1,261 versions of these libraries had a known vulnerability and about a quarter of the downloads were tainted. The study was undertaken by Aspect Security, which evaluates software for vulnerabilities, with Sonatype, a firm that provides a central repository housing more than 300,000 libraries for downloading open source components and gets 4 billion requests pe...

Open source,Security,Vulnerability 2012-03-28 06:10:19

Google is developing advanced programming technology to simplify Web application development

Beijing, March 28. According to foreign media reports, Google engineer Alex Russell this week at EclipseCon meeting said the company is now developing lots of advanced programming techniques to simplify Web application development.Russell said, "Web development has come to a critical point, it is becoming a run-time library integration platform." Although Web is very popular compared to some platforms such as Java or Windows, it provides only a relatively original programming capability. A ...

Google,Web,Dart,Scalability 2012-03-30 06:22:13

What are some popular myths in software development?

This article is summarized from a question on Quora .The question is What are some popular myths in software development?Here is the answer which received most votes given by a guy named Lee Semel,. Some of the most prevalent myths are:The Waterfall Method of design, the idea that it is both possible, efficient and good practice to completely specify a system before building it, and to execute the steps of a software project sequentially rather than iter...

Software design,Myths,Waterfall model 2012-05-02 04:52:01

Language Complexity?

Some languages are complex, others are simple â€¦ right? C++ versus just about anything else is a good example here. But, it begs the question: what makes a language complex? So, Iâ€™ve just been reading Bruce Eckelâ€™s Artima article on Scala. Itâ€™s actually a nice article, and I enjoyed it. But, one thing bugged me â€” and, itâ€™s nicely summarised in this quote: But you can see from the code above that learning Scala should be a lot eas...

Programming language,complexity 2011-06-15 02:16:05