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copied!<p>When using javac in conjunction with -source you need to specify the bootstrap classpath to make sure no runtime errors occur when running your compiled code on a 1.6 jvm...</p> <pre><code>public class Main { public static void main(String[] args) { System.out.println("Hello World!"); } } $ javac -target 1.7 -source 1.7 Main.java $ javac -target 1.6 -source 1.6 Main.java warning: [options] bootstrap class path not set in conjunction with -source 1.6 1 warning $ javac -Xbootclasspath:/usr/java/jdk1.6.0_29/jre/lib/rt.jar -target 1.6 -source 1.6 Main.java $ javac -Xbootclasspath:/usr/java/jdk1.5.0_22/jre/lib/rt.jar -target 1.5 -source 1.5 Main.java $ javac -Xbootclasspath:/usr/java/jdk1.4.0_30/jre/lib/rt.jar -target 1.4 -source 1.4 Main.java $ javac -Xbootclasspath:/usr/java/jdk1.3.1_29/jre/lib/rt.jar -target 1.3 -source 1.3 Main.java $ javac -Xbootclasspath:/usr/java/jdk1.2.2_017/jre/lib/rt.jar -target 1.2 -source 1.2 Main.java $ javac -Xbootclasspath:/usr/java/jdk1.1.8_16/jre/lib/rt.jar -target 1.1 -source 1.2 Main.java $ javac -Xbootclasspath:/usr/java/jdk1.1.8_16/jre/lib/rt.jar -target 1.1 -source 1.1 Main.java javac: invalid source release: 1.1 Usage: javac use -help for a list of possible options $ javac -Xbootclasspath:/usr/java/jdk1.1.8_16/jre/lib/rt.jar -target 1.0 -source 1.0 Main.java javac: invalid target release: 1.0 Usage: javac use -help for a list of possible options </code></pre> <p>See <a href="http://vanillajava.blogspot.nl/2012/02/using-java-7-to-target-much-older-jvms.html" rel="noreferrer">http://vanillajava.blogspot.nl/2012/02/using-java-7-to-target-much-older-jvms.html</a> for more information.</p>

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