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build/apache-ant-1.10.4/manual/javacprops.html

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+<html>
+
+<head>
+<meta http-equiv="Content-Language" content="en-us">
+<link rel="stylesheet" type="text/css" href="stylesheets/style.css">
+<title>Properties controlling javac</title>
+</head>
+
+<body>
+
+<p>The <var>source</var> and <var>target</var> attributes
+of <code>&lt;javac&gt;</code> don't have any default values for
+historical reasons.  Since the underlying <kbd>javac</kbd>
+compiler defaults depends on the JDK you use, you may encounter
+build files that don't explicitly set those attributes and that will
+no longer compile using a newer JDK.  If you cannot change the build
+file, Apache Ant provides two properties that help you setting
+default values for these attributes.  If the attributes have been
+set explicitly, the properties listed here will be ignored.</p>
+
+<h2 id="source">ant.build.javac.source</h2>
+
+<p><em>Since Ant 1.7</em></p>
+
+<p>Provides a default value for <code>&lt;javac&gt;</code>'s
+and <code>&lt;javadoc&gt;</code>'s <var>source</var> attribute.</p>
+
+<h2 id="target">ant.build.javac.target</h2>
+
+<p><em>Since Ant 1.7</em></p>
+
+<p>Provides a default value
+for <code>&lt;javac&gt;</code>'s <var>target</var> attribute.</p>
+
+</body>
+</html>