måndag 27 augusti 2012

Android fixing R error in Android project in Eclipse

Android Developer Tip: Regenerating R.java

I've just spent half an hour trying to fathom how to get back my auto-generated R.java that magically disappeared at some point.

The usual ways of resolving issues such as clean build, restarting IDE, and wiping the screen clean with a damp cloth didn't work.

Googling around did reveal a lot of similar complaints and revived a stark deja vu feeling. The hilarious thing is that once the R guy is gone, a good chunk of your code goes red thus adding to the insult.

Rather than continuing the discovery of all the conceivable strains of the issue found in the wild, I decided to leverage the tried-and-true approach of staring at the code. Having done so for a while I spotted a few red guys under res folder. They were a leftover of my current redesign work that I was about to delete before things went awry. Sure enough, as soon as I hit Del on them the darn R thing automagically reappeared.

The moral of the story is there's just so much magic Google can do for us. Bad resources (e.g. layouts with errors) are not treated gracefully by Google Android Eclipse plugin and can deceive it into deleting R.java with no sound reason.

Posted 18th November 2009 by Borys Burnayev

Labels: android

semester på fårö

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www.sudersand.se/galleri/

Apache load balancing module

Apache loadbalancing module

http://wiki.magnolia-cms.com/display/WIKI/Guide+-+How+to+configure+an+apache+load+balancer

söndag 26 augusti 2012

JQuery in-place editor

Editing content in-place, must if ajax can be usued as desired in conjunction with play framework validation.

http://www.appelsiini.net/projects/jeditable

Auto incrementing id in POSTGRES

Auto incrementing id in POSTGRES

Yes, SERIAL is the equivalent function.

CREATE TABLE foo (
id SERIAL,
bar varchar);
INSERT INTO "foo" (bar) values ('blah');
INSERT INTO "foo" (bar) values ('blah');
SELECT * FROM foo;
1,blah2,blah

http://stackoverflow.com/questions/787722/postgresql-autoincrement

fredag 24 augusti 2012

Tomcat set memory in [$TOMCAT_HOME]/bin/setenv.sh

============================== setenv.sh ================


#! /bin/sh

# ==================================================================

#  ______                           __     _____

# /_  __/___  ____ ___  _________ _/ /_   /__  /

#  / / / __ \/ __ `__ \/ ___/ __ `/ __/     / /

# / / / /_/ / / / / / / /__/ /_/ / /_      / /

#/_/  \____/_/ /_/ /_/\___/\__,_/\__/     /_/



# Multi-instance Apache Tomcat installation with a focus

# on best-practices as defined by Apache, SpringSource, and MuleSoft

# and enterprise use with large-scale deployments.



# Credits:

#       Google -> Couldn't survive without it

#       Stackoverflow.com -> Community support

#       SpringSource -> Specifically best-practices and seminars (Expert Series)



# Based On:

#       http://www.springsource.com/files/uploads/tomcat/tomcatx-performance-tuning.pdf

#       http://www.springsource.com/files/u1/PerformanceTuningApacheTomcat-Part2.pdf

#       http://www.springsource.com/files/uploads/tomcat/tomcatx-large-scale-deployments.pdf



# Created By: Terrance A. Snyder

# URL: http://www.terranceasnyder.com, http://shutupandcode.net



# Best Practice Documentation:

# http://terranceasnyder.com/2011/05/tomcat-best-practices/



# Looking for the latest version?

# github @ https://github.com/terrancesnyder



# ==================================================================



# discourage address map swapping by setting Xms and Xmx to the same value

# http://confluence.atlassian.com/display/DOC/Garbage+Collector+Performance+Issues

export CATALINA_OPTS="$CATALINA_OPTS -Xms64m"

export CATALINA_OPTS="$CATALINA_OPTS -Xmx512m"



# Increase maximum perm size for web base applications to 4x the default amount

# http://wiki.apache.org/tomcat/FAQ/Memoryhttp://wiki.apache.org/tomcat/FAQ/Memory

export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=256m"



# Reset the default stack size for threads to a lower value (by 1/10th original)

# By default this can be anywhere between 512k -> 1024k depending on x32 or x64

# bit Java version.

# http://www.springsource.com/files/uploads/tomcat/tomcatx-large-scale-deployments.pdf

# http://www.oracle.com/technetwork/java/hotspotfaq-138619.html

export CATALINA_OPTS="$CATALINA_OPTS -Xss192k"



# Oracle Java as default, uses the serial garbage collector on the

# Full Tenured heap. The Young space is collected in parallel, but the

# Tenured is not. This means that at a time of load if a full collection

# event occurs, since the event is a 'stop-the-world' serial event then

# all application threads other than the garbage collector thread are

# taken off the CPU. This can have severe consequences if requests continue

# to accrue during these 'outage' periods. (specifically webservices, webapps)

# [Also enables adaptive sizing automatically]

export CATALINA_OPTS="$CATALINA_OPTS -XX:+UseParallelGC"



# This is interpreted as a hint to the garbage collector that pause times

# of <nnn> milliseconds or less are desired. The garbage collector will

# adjust the  Java heap size and other garbage collection related parameters

# in an attempt to keep garbage collection pauses shorter than <nnn> milliseconds.

# http://java.sun.com/docs/hotspot/gc5.0/ergo5.html

export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxGCPauseMillis=1500"



# A hint to the virtual machine that it.s desirable that not more than:

# 1 / (1 + GCTimeRation) of the application execution time be spent in

# the garbage collector.

# http://themindstorms.wordpress.com/2009/01/21/advanced-jvm-tuning-for-low-pause/

export CATALINA_OPTS="$CATALINA_OPTS -XX:GCTimeRatio=9"



# The hotspot server JVM has specific code-path optimizations

# which yield an approximate 10% gain over the client version.

export CATALINA_OPTS="$CATALINA_OPTS -server"



# Disable remote (distributed) garbage collection by Java clients

# and remove ability for applications to call explicit GC collection

export CATALINA_OPTS="$CATALINA_OPTS -XX:+DisableExplicitGC"



# Check for application specific parameters at startup

if [ -r "$CATALINA_BASE/bin/appenv.sh" ]; then

  . "$CATALINA_BASE/bin/appenv.sh"

fi



echo "Using CATALINA_OPTS:"

for arg in $CATALINA_OPTS

do

    echo ">> " $arg

done

echo ""



echo "Using JAVA_OPTS:"

for arg in $JAVA_OPTS

do

    echo ">> " $arg

done

echo "_______________________________________________"

echo ""

 

=========================== END setenv.sh ==============================

https://gist.github.com/986029

SQL good practies

SQL good practies, from SO

Column order does matter so if (and only if) the column orders match you can for example:

insert into items_verselect * from items where item_id=2;

Or if they don't match you could for example:

insert into items_ver(item_id, item_group, name)
select * from items where item_id=2;

but relying on column order is a bug waiting to happen (it can change, as can the number of columns) - it also makes your SQL harder to read
There is no good 'shortcut' - you should explicitly list columns for both the table you are inserting into and the query you are using for the source data, eg:

insert into items_ver (item_id, name, item_group)
select item_id, name, item_group from items where item_id=2;

torsdag 23 augusti 2012

JVM memory leaks

JVM memory leaks

http://java.dzone.com/news/how-fix-memory-leaks-java

måndag 20 augusti 2012

Javascript Associative array and still not....

http://stackoverflow.com/a/351723/517457

söndag 19 augusti 2012

password validation

http://stackoverflow.com/questions/8806184/play-framework-validation-matching-fields

torsdag 16 augusti 2012

JQuery UI Dialog width issue in IE 7, solution ?!

JQuery UI Dialog width issue in IE 7, solution ?!

PROBLEM==================================================
I get a scroll bar on every dialog. Looking at it, the content height is apparently calculated by the UI. In FF, that is the size of the content, INSIDE the padding. IE seems to calculate the size PLUS the padding, so there is always a scrollbar for the amount of the padding.

SOLUTION==================================================

I had this problem, and found that adding a call to height("auto") after creating the dialog seems to have done the trick for now. (Tested IE 7, Chrome, Firefox) E.g.

http://forum.jquery.com/topic/jquery-ui-dialog-size-scrollbar-issue-in-ie

ANOTHER SOLUTION==========================================

var tag = $("<div></div>");
//IE7 workaround
var w;
if (navigator.appVersion.indexOf("MSIE 7.") != -1)
    w = 400;
else
    w = "auto";

tag.html('My message').dialog({
    width: w,
    maxWidth: 600,

http://stackoverflow.com/a/9950298

FlashPlayer issue in Ubuntu, probable FIX

Try using gnash instead of Flashplayer. To install gnash sudo apt-get install gnash . I have used it for over a year and gnash seems to work better than flash.
If you feel better uninstalling flash then installing gnash you can do this by opening terminal

sudo apt-get purge flashplugin-nonfree flashplugin-installer gnash gnash-common mozilla-plugin-gnash swfdec-mozilla
sudo rm -f /usr/lib/firefox-addons/plugins/libflashplayer.so
sudo rm -f /usr/lib/mozilla/plugins/libflashplayer.so
sudo rm -f /usr/lib/mozilla/plugins/flashplugin-alternative.so
sudo rm -f /usr/lib/mozilla/plugins/npwrapper*flash*so
rm -f ~/.mozilla/plugins/*flash*so
sudo apt-get install gnash

http://askubuntu.com/questions/54044/choppy-flash-video-playback