How to identify the Jdk version ???

[raghu guru]

Hi All,

I use Maven 2.2.1 and it runs on JDK 1.5 and above, but my source code is
not 1.5 compatible yet, so i configured my compiler plugin as shown below.
Everything works fine. but when i look into MANIFEST.MF of my jar file it
shows Build-Jdk: 1.5.0_13. So how do i confirm that my code were compiled
with 1.4 only not with 1.5 ??

Please Help

....
.....
<groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <verbose>true</verbose>
                <executable>C:\JDK\ibm-jdk-1.4\bin\javac</executable>
                <compilerVersion>IBM-JDK-1.4</compilerVersion>


Thanks
Jan