The Pitfall of Trying to Be Too Smart When Using dllexport/dllimport

As a seasoned C++ developer I should’ve been aware of this which makes it a little bit embarrassing. But, since this issue has cost me several hours of searching through the Internet over the course of two or three days, I thought it might be worth sharing. Maybe somebody else is trying to be too smart or just doesn’t know better.

The problem? It is summarized in short in this StackOverflow question that I posted. With this blog post I’ll be a bit more elaborate and show some details.
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Grails Startup Error: ASSERTION FAILED at JPLISAgent.c

Grails always has something new to offer, not only features but also random bugs (unfortunately). Out of the blue I couldn’t even let Grails show its own version (grails –version) let alone perform any other action. This is all I got for each and every command I tried to execute.

*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with 
message transform method call failed at 
../../../src/share/instrument/JPLISAgent.c line: 844 
Exception: java.lang.StackOverflowError thrown from the 
UncaughtExceptionHandler in thread "main"

The following runtimes were used:

  • Windows 7 64bit
  • Java 7 Update 71 64bit
  • Grails 2.4.4

Of course I removed all temporary files and folders, the “target” folder of the project and the “.grails”, “.groovy”, “.m2” and “.ivy” folders in the user directory. Nothing helped. Some say it has to do with forking processes, but playing with those settings didn’t change a thing. After all, the error happens way earlier.

Then I came across a post that mentioned to create the “.inputrc” file (on a Linux system) because through debugging it was found that Grails tries to access this files. Well, I’m not using Linux, but since I was already in the “helplessly desperate” phase I wanted to give it a shot. Surprisingly, this file already existed.

Solution: I deleted “.inputrc” from the user folder et voilà, Grails worked again.

Grails Upgrade 2.3 to 2.4: Validation Errors

Recently I have updated our Grails 2.3 based web application to Grails 2.4. Although the 2.3 release was working fine, one doesn’t want to fall too far behind. I know out of experience that this can happen very fast. If you wait too long, then at some point the migration to a newer version is almost like starting from scratch, instead of just updating a few lines of code to accommodate for deprecated APIs. The biggest problem I encountered going to version 2.4 was a behavioral change regarding the validation.
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Mysterious Case of iPod Shuffle Always Shuffling

Just recently I experienced something odd. My good old iPod Shuffle seemed to ignore the “play in order” setting on the device and instead elected to do as the name implies and shuffle the songs.
What preceded that sudden change of behavior was a failed attempt to sync with iTunes that actually turned into restoring the firmware of the device. For whatever reason, iTunes detected a problem and its only solution was to wipe the iPod. So I did that and afterwards I had that shuffling play-in-order mode.
What actually happened is that with the restore of the firmware the default sorting of tracks on the device changed to be by their track-id. That means it sounded random to me but was in order for the Pod-thing. To solve my problem I opened the “What’s on my iPod” screen and clicked on the “Name” column to sort by artist name.

I “saved” this setting by syncing and then I was done.

(Mountain) Lion automatically wakes from sleep

Since I first got my iMac I always wondered why the machine would suddenly just wake up from Sleep in the middle of the night. I didn’t touch it since at night I prefer to sleep (or else I must be sleepwalking). I initially found a way to fix this but it came up again with the update to Mountain Lion (which just reset the preference).
Go the System Preferences and hit Energy Saver. There you’ll uncheck Wake for Wi-Fi network access (in German: Ruhezustand bei Netzwerkzugriff beenden). I figured that must be the reason because at night my router automatically turns off wireless and just before I get home from work it turns it back on. For me it did the trick.
Here are two images, one from my machine (in German) and one found on Google for an english machine.