Exception in thread "main" java.lang.NoSuchMethodError: java.lang.Character.isAlphabetic(I)Z

Question

I'm trying to run a .jar that runs fine on my own computer but gives the following exception on someone else's.

Exception in thread "main" java.lang.NoSuchMethodError: java.lang.Character.isAlphabetic(I)Z
    at chatai.Word.shrinkEndPunct(Word.java:91)
    at chatai.Word.createWord(Word.java:36)
    at chatai.ChatAI.addSentence(ChatAI.java:54)
    at shared.Initializer.main(Initializer.java:130)

I have never seen the (I)Z part before, does anyone know what this means? I already tried updating Java.

aioobe · Accepted Answer · 2011-09-01 12:49:35Z

7

I have never seen the (I)Z part before, does anyone know what this means?

The (I)Z part describes the argument and return type part of the method signature.

In this case it says that the method takes as argument an int, and returns a boolean.

Here's the complete list of such type notation:

V           void
Z           boolean
C           char
B           byte
S           short
I           int
F           float
J           long
D           double

L<class>;   Reference type, for example Ljava/lang/String;

~~It's hard to tell why the program runs fine on your computer. There is no method called isAlphabetic in the standard Java API.~~

The Character.isAlphabetic method was introduced in Java 7. It seems like you're running Java 7, and your friend has only Java 6 (or some lower version) installed.

edited Sep 1, 2011 at 12:49

answered Sep 1, 2011 at 12:26

aioobe

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3 Comments

Matthew Wilson Over a year ago

Looks like a new method in Java 7. download.oracle.com/javase/7/docs/api/java/lang/…

aioobe Over a year ago

@Mathew, ah, thanks. You taught me something today ;-) Answer updated.

Rahat Ahmed Over a year ago

Oh, thank you so much. I could have sworn that method was always there.

Community · Accepted Answer · 2017-05-23 11:59:15Z

0

User aioobe gave a nice explanation how to interpret this error message. It seems the referenced method was only introduced in java7.

edited May 23, 2017 at 11:59

CommunityBot

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answered Sep 1, 2011 at 12:37

Jörn Horstmann

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