Real meaning of javac target/source attributes

[Matthew Hughes]

It was my understanding that the target/source attributes in the javac 
task forced the compiled classes to be compatible with old versions.  
What I also assumed was that it wouldn't let me compile something if I 
was using an API that was newer than the 'target' attribute.  For 
example, my <javac> task compiles code that contains the 
java.lang.Boolean.parseBoolean(String s) method just fine -- even though 
that method was introduced in Java 1.5 and I have my target and source 
set to 1.2. 

Is there any task or utility out there that will actually check to see 
if I am using an incompatible API -- without me having to download and 
install really old JDKs and compile with them?

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