What I usually do is, in Eclipse preferences, I define an Installed JRE called "JDK X.Y.Z" and include tools.jar as part of it libraries. Then I change the project preferences to use that JRE "JDK X.Y.Z".
/**
* NOTE: Without this method present and returning LanguageVersion.JAVA_1_5,
* Javadoc will not process generics because it assumes LanguageVersion.JAVA_1_1
* @return language version (hard coded to LanguageVersion.JAVA_1_5)
*/
public static LanguageVersion languageVersion() {
return LanguageVersion.JAVA_1_5;
}