Dalvik cache location problems on Cyanogen

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User reported the following error on Cyanogen:

#  dalvikvm -classpath ruboto.jar org.jruby.Main -e "puts 'hello'"
Dalvik VM unable to locate class 'org/jruby/Main'
java.lang.NoClassDefFoundError: org.jruby.Main
       at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: org.jruby.Main in loader
dalvik.system.PathClassLoader[ruboto.jar]
       at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:532)

Original issue reported on code.google.com by damonkoh...@gmail.com on 6 Sep 2010 at 7:43

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[deleted comment]

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I'm having the exact same problem in CyanogenMod 6 on my Motorola Milestone.  
Did a logcat and found the error here:

E/dalvikvm( 6771): Can't open dex cache 
'/data/dalvik-cache/mnt@sdcard@com.googlecode.jrubyforandroid@extras@jruby@jruby
-complete-1.4.jar@classes.dex': No such file or directory
I/dalvikvm( 6771): Unable to open or create cache for 
/mnt/sdcard/com.googlecode.jrubyforandroid/extras/jruby/jruby-complete-1.4.jar 
(/data/dalvik-cache/mnt@sdcard@com.googlecode.jrubyforandroid@extras@jruby@jruby
-complete-1.4.jar@classes.dex)

With Root Explorer, I searched /data/dalvik-cache and found that the 
classes.dex files for SL4A and JRuby for Android are now located under 
/mnt/asec instead of /mnt/sdcard.

Hope this helps.

Original comment by nolanhay...@gmail.com on 4 Oct 2010 at 6:10

Attachments:

• SL4A-JRuby.logcat

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Managed to get around this with a hacky fix, started by another issue filed 
related to this.

You need to extract classes.dex from the file 
com.googlecode.jrubyforandroid/extras/jruby/jruby-complete-1.4.jar on your SD 
card, then copy it to 
/data/dalvik-cache/mnt@sdcard@com.googlecode.jrubyforandroid@extras@jruby@jruby-
complete-1.4.jar@classes.dex

then you need to
chmod 0777 
/data/dalvik-cache/mnt@sdcard@com.googlecode.jrubyforandroid@extras@jruby@jruby-
complete-1.4.jar@classes.dex

this should work. if it doesn't, do an ls -lah | grep jrubyforandroid. You 
should see one other entry besides the file you copied. It should say "system" 
and "app_XX". You need to run "chown system:app_XX 
/data/dalvik-cache/mnt@sdcard@com.googlecode.jrubyforandroid@extras@jruby@jruby-
complete-1.4.jar@classes.dex" where app_XX contains the numbers listed on the 
output of ls -lah.

JRuby is working again on my HTC Dream running CM6. Unfortunately it's still 
unbearably slow, starting the Hello World toast application takes 20.seconds!

Original comment by Gary13...@gmail.com on 18 Oct 2010 at 12:29

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Issue 411 has been merged into this issue.

Original comment by damonkoh...@gmail.com on 6 Nov 2010 at 9:21

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Issue 389 has been merged into this issue.

Original comment by damonkoh...@gmail.com on 6 Nov 2010 at 9:22

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Quote:

I think it may be a permissions issue. SL4A has root permissions, but may not 
be invoking BeanShell or Rhino as root.

If I open up a shell in SL4A and type the following command:

dalvikvm -classpath 
/mnt/sdcard/com.googlecode.bshforandroid/extras/bsh/bsh-2.0b4-dx.jar 
bsh.Interpreter

I get the same ClassNotFoundException as in the SL4A UI. However, if I su to 
root and execute, I get a nice BeanShell prompt. 

From the thread at:
http://forum.cyanogenmod.com/topic/8481-sl4a-not-working-on-cyanogen/page__gopid
__85433#entry85433

Original comment by rasha...@gmail.com on 7 Nov 2010 at 6:50

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same problem with froydvillain 1.5 (android 2.2)

Original comment by matt.zuk...@gmail.com on 16 Nov 2010 at 5:15

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originally ran into this with jruby but it looks like rhino is also affected

Original comment by matt.zuk...@gmail.com on 18 Nov 2010 at 6:40

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i've reported this on CMs issue tracker, so star it up and/or add your comments

http://code.google.com/p/cyanogenmod/issues/detail?id=3141

Original comment by safest...@gmail.com on 13 Mar 2011 at 1:17