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Published on 2010-04-07T14:31:17Z
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2010/04/07
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is it a special value? or is it a special memory address? what is it exactly?
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Is there a way to quickly switch over all the Java related alternatives using update-alternatives?
For instance, if want to switch Java over to 7, I run sudo update-alternatives --config java and select the Java 7 OpenJdk. But if I run update-alternatives --get-selections | grep java I get the following…
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??Oracle JRockit JVM?????????????????????·?????????????????????????JVM??????? ???????????????????????????????????????????????????????????????????????? ??????? ?????????Oracle JRockit???????·??????????????????????????????????????????????????????????? Oracle JRockit JDK???????????????????…
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can this be solved simply by specifying the complete url of the servlet in the RequestDispatcher?
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JRockit JVM???????????????????????????????????????????????????????????????????????????????????????????? ?JVM???????????????? ?JVM??????????? ???????????????????? ????????? ?JVM??????????????JVM??????????????…
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Apache ds fails to list the users
INFO | jvm 1 | 2012/03/28 15:54:04 | java.lang.Error: ERR_546 CRITICAL: page header magic for block 59 not OK 0
INFO | jvm 1 | 2012/03/28 15:54:04 | at jdbm.recman.PageHeader.(PageHeader.java:95)
INFO | jvm 1 | 2012/03/28 15:54:04 | at…
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As the title says, I'm having trouble with a very noisy audio input device - the internal mic or any plugged in mics.
So far I've narrowed it down to an problem in ALSA since my debug info is showing a lot of "null" values. Can anyone help?
Debug Info: http://www.alsa-project.org/db/?f=e0c6fb7e10624bf7691aa2b405cf0d3968e56c63
Exert…
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as seen on SQL Blogcasts
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Tuning takes many routes and I get into some interesting situations and often make some exciting finds, see http://sqlblogcasts.com/blogs/grumpyolddba/archive/2010/05/17/just-when-you-thought-it-was-safe.aspx for an example. Today I encountered a multitude of Foreign Key constraints on a table, now…
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I have few queries and am not able to figure out how to optimize them,
QUERY 1
select *
from t_twitter_tracking
where classified is null and tweetType='ENGLISH'
order by id limit 500;
QUERY 2
Select
count(*) as cnt,
DATE_FORMAT(CONVERT_TZ(wrdTrk.createdOnGMTDate,'+00:00','+05:30'),'%Y-%m-%d')…
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I need your help!!!.
I need to query a table in my database that has record of goods sold. I want the query to detect a particular product and also calculate the quantity sold. The product are 300 now, but it would increase in the future.
Below is a sample of my DB Table
#----------------------------
#…
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When doing null checks in Java code, and you throw IllegalArgumentExceptions for null values, what kind of message template do you use?
We tend to use something like this
public User getUser(String username){
if (username == null){
throw new IllegalArgumentException("username is null");…
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