MCOMPILER-124: Default source/target to 1.5

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@932664 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java b/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java
index 3db0e22..5f39908 100644
--- a/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java
+++ b/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java
@@ -109,14 +109,14 @@
     /**
      * The -source argument for the Java compiler.
      *
-     * @parameter expression="${maven.compiler.source}"
+     * @parameter expression="${maven.compiler.source}" default-value="1.5"
      */
     protected String source;
 
     /**
      * The -target argument for the Java compiler.
      *
-     * @parameter expression="${maven.compiler.target}"
+     * @parameter expression="${maven.compiler.target}" default-value="1.5"
      */
     protected String target;