2014 年 9月随笔档案 - HelloTech

Java系列笔记(1) - Java 类加载与初始化

摘要：Copy from :http://www.cnblogs.com/zhguang/p/3154584.htmlJava系列笔记(1) - Java 类加载与初始化目录类加载器动态加载链接初始化示例类加载器在了解Java的机制之前，需要先了解类在JVM（Java虚拟机）中是如何加载的，这对后面理解j... 阅读全文

posted @ 2014-09-14 13:48 HelloTech 阅读(213) 评论(0) 推荐(0)

SQL四种语言：DDL,DML,DCL,TCL

摘要：Copy fromhttp://www.cnblogs.com/henryhappier/archive/2010/07/05/1771295.htmlSQL四种语言：DDL,DML,DCL,TCL1.DDL（DataDefinition Language）数据库定义语言statements are... 阅读全文

posted @ 2014-09-12 14:18 HelloTech 阅读(188) 评论(0) 推荐(0)

Summary of Operators

摘要：Copy fromhttp://docs.oracle.com/javase/tutorial/java/nutsandbolts/opsummary.htmlThe following quick reference summarizes the operators supported by th... 阅读全文

posted @ 2014-09-11 10:10 HelloTech 阅读(177) 评论(0) 推荐(0)

最近纠结致死的一个java报错java.net.SocketException: Connection reset 终于得到解决

摘要：Copy fromhttp://www.seotcs.com/blog/796.html自从SEOTcs系统11月份24日更新了一下SEO得分算法以来，一直困扰我的一个问题出现了，java的数据job任务，在执行过程中会经常报以下的错误：“2011-12-03 18:00:32 DefaultHtt... 阅读全文

posted @ 2014-09-11 10:08 HelloTech 阅读(20741) 评论(0) 推荐(0)

nternal Exception java.net.socketexception Connection Reset Error : A Guide

摘要：Copy fromhttp://www.minecraftman.com/internal-exception-java-net-socketexception-connection-reset/Internal Exception java.net.socketexception Connecti... 阅读全文

posted @ 2014-09-10 14:53 HelloTech 阅读(3207) 评论(0) 推荐(0)

java.net.SocketException四大异常解决方案

摘要：Copy fromhttp://developer.51cto.com/art/201003/189724.htmjava.net.SocketException在我们使用的时候会出现很多异常，这些会影响到我们的学习和使用。下面我们就仔细的研究一下。AD：2014WOT全球软件技术峰会北京站课程视... 阅读全文

posted @ 2014-09-10 14:34 HelloTech 阅读(13152) 评论(0) 推荐(0)

Creation, dynamic loading and instrumentation with javaagents

摘要：Copy from:http://dhruba.name/2010/02/07/creation-dynamic-loading-and-instrumentation-with-javaagents/Creation, dynamic loading and instrumentation wit... 阅读全文

posted @ 2014-09-03 09:13 HelloTech 阅读(689) 评论(0) 推荐(0)

Adding a JavaAgent

摘要：Copy from:http://tomee.apache.org/javaagent.htmlAdding a JavaAgentAdding a java agent is done via a vm parameter as follows:java -javaagent:openejb-ja... 阅读全文

posted @ 2014-09-03 09:11 HelloTech 阅读(548) 评论(0) 推荐(0)

javaagent加载机制分析

摘要：Copy from :http://nijiaben.iteye.com/blog/1847212 在启动和运行期都可以加载agent代理，在启动的时候可通过-javaagent参数来执行agent代理，而在运行期就是通过attach这种机制动态load了。如果在vm启动过程中加载agent，那... 阅读全文

posted @ 2014-09-03 09:10 HelloTech 阅读(4386) 评论(0) 推荐(0)

Instrumentation: querying the memory usage of a Java object

摘要：Copy from:http://www.javamex.com/tutorials/memory/instrumentation.shtmlInstrumentation: querying the memory usage of a Java objectThe most reliable— b... 阅读全文

posted @ 2014-09-03 09:06 HelloTech 阅读(276) 评论(0) 推荐(0)

SQL Server Isolation Levels By Example

摘要：Isolation levels in SQL Server control the way locking works between transactions.SQL Server 2008 supports the following isolation levelsRead Uncommit... 阅读全文

posted @ 2014-09-03 08:57 HelloTech 阅读(244) 评论(0) 推荐(0)

Measure Java Performance – Sampling or Instrumentation

摘要：copy from https://blog.codecentric.de/en/2011/10/measure-java-performance-sampling-or-instrumentation/In recent discussions, I noticed a confusion abo... 阅读全文

posted @ 2014-09-03 08:56 HelloTech 阅读(337) 评论(0) 推荐(0)

Tracing java execution (copy from http://zvikico.typepad.com/problog/2007/11/five-ways-for-t.html)

摘要：Five ways for tracing Java executionI'm often faced with a situation where I need to dig into code that I didn't write. Most of it is poorly documente... 阅读全文

posted @ 2014-09-03 08:54 HelloTech 阅读(168) 评论(0) 推荐(0)

Implementing a java agent to instrument code (copy from http://chimpler.wordpress.com/2013/11/05/implementing-a-java-agent-to-instrument-code/)

摘要：With a system running 24/7, you have to make sure that it performs well at any time of the day. Several commercial solutions exist to monitor the perf... 阅读全文

posted @ 2014-09-02 19:31 HelloTech 阅读(373) 评论(0) 推荐(0)