NoSuchMethodError in BigDecimal when compiling with 1.5 targetted for 1.4

FULL PRODUCT VERSION :
Both :
java version "1.4.2_07"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_07-b05)
Java HotSpot(TM) Client VM (build 1.4.2_07-b05, mixed mode)
And
java version "1.5.0_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_01-b08)
Java HotSpot(TM) Client VM (build 1.5.0_01-b08, mixed mode)



ADDITIONAL OS VERSION INFORMATION :
Linux dub-280-41 2.6.10-gentoo-r4 #1 SMP Mon Jan 10 12:03:01 GMT 2005 i686 Intel(R) Pentium(R) 4 CPU 3.00GHz GenuineIntel GNU/Linux


A DESCRIPTION OF THE PROBLEM :
I was looking into migrating from JDK1.4 to JDK1.5, and given the code (in the example code section)

when I compile this on JDK1.4, it compiles and runs correctly
However, when I compile it as:
/opt/sun-jdk-1.5.0.01/bin/javac -source 1.4 Test.java
And run it (using the 1.4 JVM), I get the following error at runtime:
Exception in thread "main" java.lang.NoSuchMethodError: java.math.BigDecimal.<init>(I)V


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the example source using JDK1.4, run -- works correctly
Compile the example source using JDK1.5, and run against the 1.5 JVM -- works correctly
Compile the example source using JDK1.5, and run against the 1.4 JVM -- fails with NoSuchMethodError

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Should work on all releases.
ACTUAL -
NoSuchMethodError

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.NoSuchMethodError: java.math.BigDecimal.<init>(I)V
        at Test.main(Test.java:6)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.math.BigDecimal;

public class Test
{
        public static void main(String[] args)
        {
                BigDecimal dec = new BigDecimal(1);
        }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Change the code to
                BigDecimal dec = new BigDecimal((double) 1);
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