Thinking ExceptionThrow new com.thestore.ThinkingException(”Wayne Wan”);

    Nowadays we are familiar with the forward and backward function of browser, but may be little of us know the real algorithm of it. In a recent project, I have to simulate a forward-backward function for our ajax based web application. So I spend some time on the forward-backward algorithm of Chrome. Read the rest of this entry »

    Today, Spring AOP is widely used in transaction manage, but I found something that I had never noticed yet.
    The situation was :  I have a service class named KeywordExtendService , there are 2 methods in it named: "start" and "service". the service method will invoke the start method. but I config the pointcut like : execution(* com.waynewan.KeywordExtendService .start(..)) .  and the transaction propagation level is "REQUIRED",  so this means if there is an transaction it will use the exist one, if not it will create one. but the result is not as I guessed. when the start method invoked in the service method(no transaction configuration), there is no transaction start.  Read the rest of this entry »

    During my installing of hadoop on my laptop which was based on windows7, I encountered some problems which cost me couple of hours, so I plan to write it down.

    The standard process was  :

1. install Cygwin(must enable openSSH feature when installing).
2. download Hadoop package from official site, and extract it.(PS: in my laptop, I must extract it in the directory which cygwin located, or hadoop namenode would not be started. )
3. set environment variables: JAVA_HOME, HADOOP_INSTALL, add %HADOOP_INSTALL%/bin to PATH.
4. open %HADOOP_INSTALL%/conf/hadoop-env.sh, add "export JAVA_HOME=***", add "export HADOOP_INSTALL=**".
5. then open Cygwin terminal, type "hadoop version", if no error found ,then it's ok. if error found , check your HADOOP_INSTALL, and PATH setting.(PS: be ware of the JAVA_HOME, it is recommended that this path should not include " "(space)).
6. modity core-site.xml, hdfs-site.xml, mapred-site.xml using below content:
   <?xml version="1.0"?>
   <!– core-site.xml –>
   <configuration>
   <property>
   <name>fs.default.name</name>
   <value>hdfs://localhost/</value>
   </property>
   </configuration>
   <?xml version="1.0"?>
   <!– hdfs-site.xml –>
   <configuration>
   <property>
   <name>dfs.replication</name>
   <value>1</value>
   </property>
   </configuration>
   <?xml version="1.0"?>
   <!– mapred-site.xml –>
   <configuration>
   <property>
   <name>mapred.job.tracker</name>
   <value>localhost:8021</value>
   </property>
   </configuration>
7. configuring SSH using command: ssh-host-config , select not create private privilege account(may not the same word, but seems like it.).
   then generate a new SSH key (so we can login without password, the same as hadoop running on it) .
   % ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
   % cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
   Test with : ssh localhost ( before we can login , we must start the cygwin ssh service firstly. )
8.  initialize hadoop namenode using :  hadoop namenode -format. if you can find "tmp/hadoop-*/dfs/name" in the directory which hadoop located, then congratulations.
9. run start-all.sh (it will start namenode, jobtracker, secondary namenode, datanode). using jps command to verify if these deamon process were started successfully. also can check it by http://localhost:50030/ for the jobtracker, http://localhost:50070/ for the namenode.

    In my laptop, I must change the cygwin service configuration, I must change the service logon role. (using the account which was in administrator group)
. . u  

    Today, when I perform the serviceDeploy on our mediation project I encountered a strange problem.I could serviceDeploy successfully manually, but not able to do it by hudson. When I used hudson to generate ear package automatically, I got deployment failed from the console, then I tried to find more details, after hours and hours later, I found there was an parameter I could used to trace the problem like the parameter of serviceDeploy.bat has.(The parameter was 'keep' ).  After  I turned on this switch, I found "com.ibm.etools.rmic.RMICException", the whole stacktrace were: Read the rest of this entry »

Quick post… If you are not familiar with WebSphere at first you might get confused with its concepts: cell, deployment manager, node, node agent, cluster, server, …

First of all, lets start with the concept of a Cell:

A Cell is a virtual unit that is built of a Deployment Manager and one or more nodes. I guess a picture will help making things clearer: Read the rest of this entry »

    JDBCProvider向Websphere Message Broker(WMB)中需要操作数据库的node提供数据库连接服务，JDBCProvider作为一个服务被注册到指定的broker中。

     这里需要涉及到的几条命令有：

1. mqsideleteconfigurableservice， 用于删除一个可配置的服务对象。
   例如：mqsideleteconfigurableservice MB7BROKER -c JDBCProviders -o SIMPLERROUTEDB
   表示从MB7BROKER这个broker中删除type为JDBCProviders的服务(configurable service)中的名为SIMPLERROUTEDB可配置对象(configurable service object).
2. mqsicreateconfigurableservice，用于创建一个可配置的服务对象(configurable service)
   例如： Read the rest of this entry »

sporting house 妓院（不是“体育室”） 

dead president 美钞（上印有总统头像）（并非“死了的总统”） 

lover 情人（不是“爱人”）

busboy 餐馆勤杂工（不是“公汽售票员”）

busybody 爱管闲事的人（不是“大忙人”）

dry goods （美）纺织品；（英）谷物（不是“干货”）

heartman 换心人（不是“有心人”） 

mad doctor 精神病科医生（不是“发疯的医生”）

eleventh hour 最后时刻（不是“十一点”） 

blind date （由第三者安排的）男女初次会面（并非“盲目约会”或“瞎约会”）  

Read the rest of this entry »