in src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java [1407:1418]
private String getMemoryValue(String setting) {
String value = null;
// Allow '128' or '128m'
if (isDigits(setting)) {
value = setting + "m";
} else if ((isDigits(setting.substring(0, setting.length() - 1)))
&& (setting.toLowerCase().endsWith("m"))) {
value = setting;
}
return value;
}