I use Eclipse to do my Android development for a few reasons:

• it's the only IDE fully supported by the Android dev team
• it has a visual Layout/Resources builder that transforms XML files into corresponding visual representations
• it's free and open source
• I've been using Eclipse for many years and am very familiar with it

The Problem

However, one thing about Eclipse Android development has bothered me for a while – and that is XML formatting by the visual tools. See, if you open an XML file in Eclipse and use the Layout/Resources tab (which functions as either a visual UI builder or a visual frontend to resource management), Eclipse creates the XML representation of what you're building and dumps it into the file you're editing. The problem is, this XML is not formatted in any way – Eclipse just writes it in a single line, which looks absolutely horrible and is essentially unusable.

For example, I had this beautifully formatted XML file with a sample Android menu. After using the Layout tab to add another item, I ended up with an single ugly unindented line for it.

The Solution

Here's how to solve this in an almost fully automated fashion, using formatting rules that I think result in the most readable file. There is no need for external tools – Eclipse provides everything needed.

• open up Window->Preferences->XML->XML Files->Editor
  
• check the "Split multiple attributes each on a new line" and adjust other options according to your liking (such as Indent using spaces and Indentation size)
• press OK to save the options
• all you have to do now is press Ctrl-Shift-F or select Source->Format

Let's see what this does to the XML I showed above:

It's a beauty, isn't it? Eclipse's Auto Format is one of its best features (yes, you can apply it to your Android Java code too as well as pretty much any other document format).

Bonus – XML Cleanup

As an added bonus, Eclipse also offers a Cleanup XML option, which can do the following:

• compress empty element tags
• insert required attributes
• insert missing tags
• quote attribute values
• format source (as above)
• convert line delimiters to Windows, UNIX, or Mac

You can access the Cleanup option via Source->Cleanup

Running Cleanup on my already pretty clean XML file turned the last <item> into this:

The first option compressed the <item></item> declaration to simply <item />. Neat, isn't it?

Final Words

+ Clean is good.

+ Uniform is good.

+ Use Ctrl-Shift-F and make it a habit.

+ Create a keyboard shortcut to the Cleanup function by going to Window->Preferences->General->Keys and use it instead of Ctrl-Shift-F (since it already formats as part of the Cleanup).

? I'd like to know if there is a way to apply auto formatting upon save, automatically. Do you?

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The plugin install page provides initial instructions and the location of the plugin to give Eclipse (https://dl-ssl.google.com/android/eclipse/). This is very standard stuff and I've installed many plugins exactly the same way. However, here's when problems started.

Problem #1: Error while loading manipulator

Eclipse just shows a cryptic Install failed box. Here are the highlights:

• !MESSAGE Error while loading manipulator
• java.lang.IllegalStateException: !fwConfigLocation.equals(fwPersistentDataLocation)

It looks like for whatever reason, Eclipse's fwConfigLocation variable does not match fwPersistentDataLocation. I have no idea where those come from and searching for a solution (such as this crazy Japanese sourceforge and this Eclipse bug), restarting Eclipse, and beating my head against the wall took the majority of my the 2 hours I spent on this.

Here's the full log, which will help people with the same problem find it in search engines:

!ENTRY org.eclipse.equinox.p2.touchpoint.eclipse 4 0 2009-10-15 13:21:11.224
!MESSAGE Error while loading manipulator.
!STACK 0
java.lang.IllegalStateException: !fwConfigLocation.equals(fwPersistentDataLocation)
	!fwConfigLocation=C:\eclipse\configuration
	,fwPersistentDataLocation=C:\eclipse\plugins\configuration
	at org.eclipse.equinox.internal.frameworkadmin.equinox.EquinoxManipulatorImpl.checkConsistencyOfFwConfigLocAndFwPersistentDataLoc(EquinoxManipulatorImpl.java:65)
	at org.eclipse.equinox.internal.frameworkadmin.equinox.EquinoxManipulatorImpl.loadWithoutFwPersistentData(EquinoxManipulatorImpl.java:360)
	at org.eclipse.equinox.internal.frameworkadmin.equinox.EquinoxManipulatorImpl.load(EquinoxManipulatorImpl.java:331)
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.LazyManipulator.loadDelegate(LazyManipulator.java:50)
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.LazyManipulator.getConfigData(LazyManipulator.java:108)
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.UninstallBundleAction.uninstallBundle(UninstallBundleAction.java:74)
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.UninstallBundleAction.execute(UninstallBundleAction.java:29)
	at org.eclipse.equinox.internal.p2.engine.ParameterizedProvisioningAction.execute(ParameterizedProvisioningAction.java:35)
	at org.eclipse.equinox.internal.provisional.p2.engine.Phase.mainPerform(Phase.java:129)
	at org.eclipse.equinox.internal.provisional.p2.engine.Phase.perform(Phase.java:72)
	at org.eclipse.equinox.internal.provisional.p2.engine.PhaseSet.perform(PhaseSet.java:44)
	at org.eclipse.equinox.internal.provisional.p2.engine.Engine.perform(Engine.java:54)
	at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProvisioningUtil.performProvisioningPlan(ProvisioningUtil.java:389)
	at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProfileModificationOperation.doExecute(ProfileModificationOperation.java:61)
	at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProvisioningOperation.execute(ProvisioningOperation.java:37)
	at org.eclipse.equinox.internal.provisional.p2.ui.ProvisioningOperationRunner$1.run(ProvisioningOperationRunner.java:94)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
 
!ENTRY org.eclipse.equinox.p2.engine 4 4 2009-10-15 13:21:11.240
!MESSAGE An error occurred while uninstalling
!SUBENTRY 1 org.eclipse.equinox.p2.engine 4 0 2009-10-15 13:21:11.240
!MESSAGE session context was:(profile=epp.package.php, phase=org.eclipse.equinox.internal.provisional.p2.engine.phases.Uninstall, operand=[R]javax.activation 1.1.0.v200905021805 --> [R]javax.activation 1.1.0.v200906290531, action=org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.UninstallBundleAction).
!SUBENTRY 1 org.eclipse.equinox.p2.engine 4 0 2009-10-15 13:21:11.240
!MESSAGE Error while loading manipulator.
!STACK 0
java.lang.IllegalStateException: Error while loading manipulator.
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.LazyManipulator.loadDelegate(LazyManipulator.java:54)
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.LazyManipulator.getConfigData(LazyManipulator.java:108)
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.UninstallBundleAction.uninstallBundle(UninstallBundleAction.java:74)
	at org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.UninstallBundleAction.execute(UninstallBundleAction.java:29)
	at org.eclipse.equinox.internal.p2.engine.ParameterizedProvisioningAction.execute(ParameterizedProvisioningAction.java:35)
	at org.eclipse.equinox.internal.provisional.p2.engine.Phase.mainPerform(Phase.java:129)
	at org.eclipse.equinox.internal.provisional.p2.engine.Phase.perform(Phase.java:72)
	at org.eclipse.equinox.internal.provisional.p2.engine.PhaseSet.perform(PhaseSet.java:44)
	at org.eclipse.equinox.internal.provisional.p2.engine.Engine.perform(Engine.java:54)
	at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProvisioningUtil.performProvisioningPlan(ProvisioningUtil.java:389)
	at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProfileModificationOperation.doExecute(ProfileModificationOperation.java:61)
	at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProvisioningOperation.execute(ProvisioningOperation.java:37)
	at org.eclipse.equinox.internal.provisional.p2.ui.ProvisioningOperationRunner$1.run(ProvisioningOperationRunner.java:94)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
!SESSION 2009-10-15 13:31:40.853 -----------------------------------------------
eclipse.buildId=I20090611-1540
java.version=1.6.0_16
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Command-line arguments:  -os win32 -ws win32 -arch x86

Finally, I found a solution that worked – modify eclipse.ini (the one that sits in elipse's install directory) and add the following:

1
2
3
4

-startup
file:/C:/eclipse/plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar
--launcher.library
file:/C:/eclipse/plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.0.200.v20090519

Note that the exact locations may differ for you, so figure out what is installed on your machine and replace accordingly.

Also, it seems that the location of the file HAS to be on a new line – otherwise it is not recognized. What kind of shit is that, Eclipse? Some values in eclipse.ini are specified on the same line separated by space, some separated by '=', and some have to be on a new line? This fun trivia fact wasted about 45 minutes of my time.

And yes, startup has 1 dash and launcher.library has 2. /sigh

Edit: it looks like by default Eclipse does come with these options. I somehow managed to lose them, so this is probably my fault. The error couldn't be more cryptic though.

Problem #2: java.io.IOException: The file "C:\eclipse\features\com.android.ide.eclipse.adt_0.9.3.v200909031112-12945" does not exist

Great. Now what…

After examining the features directory, I indeed found that directory com.android.ide.eclipse.adt_0.9.3.v200909031112-12945 does not exist. What I did find though is com.android.ide.eclipse.adt_0.9.3.v200909031112-12945.jar, which is simply an archive. Why didn't you unpack this archive, Eclipse? Or Android plugin devs? Whoever is responsible for this – argh!

After quickly creating the directories and unpacking the .jar contents into them, Eclipse was finally able to install the Android plugin.

If installing a plugin is this friendly, I can only imagine what awaits me in Android app development. Am I the only one with these problems? You let me know.

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I am throwing up a quick post about a relatively cryptic error that Solr started throwing the other day here at Plaxo. After happily running for a few days, I suddenly started getting pages about failed Solr indexing.

Upon closer examination, I saw the following repeatedly in the log file:

catalina.2009-09-18.log:SEVERE: java.io.IOException: directory 'DATADIR/index'
exists and is a directory, but cannot be listed: list() returned null

I tried to see if sending an OPTIMIZE command would help but the server returned the same response.

Digging Deeper

The reason was these errors was quite simple – Solr was running into the system level limit on allowed number of open files (ulimit). This limit can be seen by running

ulimit -n
1024

or simply

ulimit -a | grep 'open files'
open files                      (-n) 1024

This means that if a process tries to open that many files at the same time, the kernel will prohibit opening any more, which in my case caused the Java IOException.

In my case, I haven't been using the Solr OPTIMIZE command for a while, so after a lot of COMMITs, the Solr data got pretty fragmented, thus hitting the open files limit.

The Solution

There are 2 things to be done here:

1. OPTIMIZE Solr more often. When an OPTIMIZE occurs, multiple index files are merged into 1, thus reducing the number of files that need to be opened. However, before you can OPTIMIZE, you have to raise the allowed number of open files (see the next bullet).

2. Set a higher open files limit for the user that runs Solr (in my case, the solr user) – for example to 4096 instead of 1024. One way to do it is by adding a file /etc/security/limits.d/solr.conf with the following contents:

   solr hard nofile 4096
   solr soft nofile 4096

   and then logging out and back in. The file should be automatically loaded, which you can verify by running the ulimit commands from the section above.

Happy Solring!

By the way, here's a really good resource for Solr 1.4 that just came out: Solr 1.4 Enterprise Search. I have this book and it's quite helpful in explaining such topics as multicore setup, search methods, replication, etc.

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StackOverflow is an amazing site for coding questions. It was created by Joel Spolsky of joelonsoftware.com, Jeff Atwood of codinghorror.com, and some other incredibly smart guys who truly care about user experience. I have been a total fan of SO since it went mainstream and it's now a borderline addiction (you can see my StackOverflow badge on the right sidebar).

The Story

So, one day someone at StackOverflow started a "Hidden features of" post about a famous language (I don't feel like finding out which one was first exactly), and it turned out to be so popular that other posts in the same series started popping up.

Such questions were quickly turned into community wikis, for the purposes of harvesting and organizing information coming from the best developers on the planet and voted by users of the site. There are literally hundreds of answers, sorted by votes.

Hidden Features Of

Programming Languages

Hidden features of ActionScript3 / Flex

Hidden features of ASP.NET

Hidden features of x86 assembly

Hidden features of C

Hidden features of C++

Hidden features of C#

Hidden features of ColdFusion

Hidden features of D

Hidden features of Delphi

Hidden features of Erlang

Hidden features of F#

Hidden features of Flash development, Flash language (AS2/3), and Flash IDE

Hidden features of Java

Hidden features of JavaScript

Hidden features of Haskell

Hidden features of Lisp

Hidden features of Lua

Hidden features of Objective-C

Hidden features of Perl

Hidden features of PHP

Hidden features of Python

Hidden features of R

Hidden features of Ruby

Hidden features of Ruby on Rails

Hidden features of Scala

Hidden features of Silverlight

Hidden features and Dark Corners of STL?

Hidden features of TCL/TK

Hidden features of VB.Net

Hidden features of VBA

Databases

Hidden features of MySQL

Hidden features of Oracle

Hidden features of PL/SQL

Hidden features of PostgreSQL

Hidden features of SQL Server

Mobile

Hidden features of Android development

Other

Hidden features of Bash – also see my bash cheatsheet.

Hidden features of CSS

Hidden features of Django

Hidden features of Eclipse

Hidden features of Emacs

Hidden features of Grails

Hidden features of Greasemonkey

Hidden features of HTML

Hidden features of HTTP

Hidden features of jQuery

Hidden features of mod_rewrite

Hidden features of Qt

Hidden features of RegEx

Hidden features of Spring framework

Hidden features of VHDL

Hidden features of Visual Studio (2005-2008)

Hidden features of Windows.Forms

Hidden features of WPF and XAML

Hidden features of Xpath+Xslt

I will try to maintain this list, adding new languages that join the series as I find them. Now go learn something new!

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If you use VNC to remotely connect to your machines and are having problems with certain applications not showing changes (redrawing), this will, hopefully, solve the problem for you.

The symptoms are simple: you load a program but only the program outline and maybe the first frame would show up. After that, nothing would update, even though the user in front of the remote computer can see everything updating fine. For me, it is happening with all Java based programs (SmartSVN, Charles – amazing program btw!, etc). Here's what's happening to my Charles application – it never even sent the first frame, simply showing the desktop and not updating:

The problem may be confined to RealVNC only, or at least any VNC program that uses a special mirror driver. You can tell whether your VNC server uses a mirror driver by looking at your Settings->Desktop options under "Optimise screen capture (mirror driver)":

The Solution

I'm not sure if it's Java's fault or the mirror driver's but, as it turns out, the mirror driver does not properly work with Java based programs, at least at the moment. Disabling it, or switching to application hooking fixes the problem. There is most likely a benefit in using a mirror driver as it is probably optimized better than other methods, but it's not worth keeping if you are having problems with it.

The easiest way to disable the setting is to uncheck the checkbox above. You can also alternatively go to Expert options, find the UpdateMethod variable, and switch it to 0 or 1. I am fairly confident the setting of 1 is less resource intensive than 0, so I went with it.

My Java programs are fixed and redrawing fine now.

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