Can't concat strings: NoClassDefFoundError

indeed · 09-03-2013, 05:49 AM

hi,

my program crashed with the following exception:

Code:

java.lang.NoClassDefFoundError: java.lang.StringBuilder
at sgfEditor.Main.start(Main.java:92)
at com.amazon.kindle.kindlet.internal.lifecycle.K.call(dlc:998)
at edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(FutureTask.java:178)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1029)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:547)
at java.lang.Thread.run(Unknown Source)
at java.lang.Thread.startup(Unknown Source)

It seems I cannot concat strings. These lines produce the exception:

Code:

String a = "a";
String b = "b";
a += b;

the firmware version of my kindle paperwhite is 5.3.5

twobob · 09-03-2013, 06:04 AM

You know... I seem to recall that happening to me...

Anyways: http://geekycoder.wordpress.com/2009...ization-of-vm/

Perhaps that has the answer?
Not awake properly yet.

Could there be another type of concatenation?
I vaguely recall using some other construct?? <-- This, oh yeah. Java too new

EDIT:
Oh yeah! doh. REading down - that was it

would need to use retroweaver probably.

You are on WIndows then?

hawhill · 09-03-2013, 06:13 AM

Your toolchain generates code for Java >= 1.5, while the JVM on the Kindle expects 1.4 code.

bhaak · 09-03-2013, 06:22 AM

What Hawhill said. You should be able to fix that with supplying a the target parameter.

For example:
javac -target 1.4 YourClass.java

indeed · 09-03-2013, 06:40 AM

Thank you, that solved it.
In the following tutorial https://www.mobileread.com/forums/sho...d.php?t=219663 the target parameter wasn't specified. Maybe it should be changed.

edit: I had to set the source parameter to 1.4 as well.

knc1 · 09-03-2013, 08:32 AM

Quote:

Originally Posted by indeed

Thank you, that solved it.
In the following tutorial https://www.mobileread.com/forums/sho...d.php?t=219663 the target parameter wasn't specified. Maybe it should be changed.

edit: I had to set the source parameter to 1.4 as well.

We have a method for that here -
Go to the post with the omission -
Click the "Report Post" button on it -
Make your request for the correction in the report text box.

That gets your request in front of the forum moderators.

ixtab · 09-03-2013, 02:03 PM

Better yet: just post it in the original thread, so the original author gets notified - he might well adapt the instructions.

(Yes, I could change it, but I'm very reluctant to modify other people's posts, unless there's a real "moderator" reason.)

09-03-2013, 06:04 AM	#2
twobob ( ͡° ͜ʖ ͡°){ʇlnɐɟ ƃǝs}Týr Posts: 6,586 Karma: 6299993 Join Date: Jun 2012 Location: uti gratia usura (Yao ying da ying; Mo ying da yieng) Device: PW-WIFI\|K5-3G+WIFI\| K4\|K3-3G\|DXG\|K2\| Rooted Nook Touch	You know... I seem to recall that happening to me... Anyways: http://geekycoder.wordpress.com/2009...ization-of-vm/ Perhaps that has the answer? Not awake properly yet. Could there be another type of concatenation? I vaguely recall using some other construct?? <-- This, oh yeah. Java too new EDIT: Oh yeah! doh. REading down - that was it would need to use retroweaver probably. You are on WIndows then? Last edited by twobob; 09-03-2013 at 09:02 AM.

09-03-2013, 06:40 AM	#5
indeed Junior Member Posts: 2 Karma: 10 Join Date: Sep 2013 Device: Kindle Paperwhite	Thank you, that solved it. In the following tutorial https://www.mobileread.com/forums/sho...d.php?t=219663 the target parameter wasn't specified. Maybe it should be changed. edit: I had to set the source parameter to 1.4 as well. Last edited by indeed; 09-03-2013 at 07:14 AM.

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09-03-2013, 06:13 AM	#3
hawhill Wizard Posts: 1,379 Karma: 2155307 Join Date: Nov 2010 Location: Goettingen, Germany Device: Kindle Paperwhite, Kobo Mini	Your toolchain generates code for Java >= 1.5, while the JVM on the Kindle expects 1.4 code.

09-03-2013, 06:22 AM	#4
bhaak Groupie Posts: 164 Karma: 164969 Join Date: Dec 2011 Device: Palm IIIx, (iPhone\|Kindle) Touch	What Hawhill said. You should be able to fix that with supplying a the target parameter. For example: javac -target 1.4 YourClass.java

09-03-2013, 02:03 PM	#7
ixtab (offline) Posts: 2,907 Karma: 6736094 Join Date: Dec 2011 Device: K3, K4, K5, KPW, KPW2	Better yet: just post it in the original thread, so the original author gets notified - he might well adapt the instructions. (Yes, I could change it, but I'm very reluctant to modify other people's posts, unless there's a real "moderator" reason.)