Scot P. Floess wrote:
Curious, why don't you just use the 1.5 javac but target 1.4? That
should do what you want... I think all you will need to do is this:
<javac srcdir="src" destdir="classes" source="1.4" target="1.4"/>
The problem is that the 1.5 javac won't complain if I accidently use
functions from the 1.5 api. It will create a class file which *looks*
like 1.4 (as to the class version number), but cannot be executed by a
1.4 jvm.
Try the following example:
public class Test {
public static void main(String[] args) {
String s = "Hello World";
int i = s.codePointAt(0);
}
}
If I compile with "/usr/java/jdk1.5.0/bin/javac -source 1.4 -target 1.4
Test.java" the compiler won't complain. However, if I start this app
with a 1.4 jvm I get the following exception:
Exception in thread "main" java.lang.NoSuchMethodError:
java.lang.String.codePointAt(I)I
at Test.main(Test.java:4)
The 1.4 compiler would have reported the following error:
Test.java:4: cannot resolve symbol
symbol : method codePointAt (int)
location: class java.lang.String
int i = s.codePointAt(0);
^
1 error
That's why I try to use the compiler of the target platform.
Regards,
Christian
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