Eclipse Helios没有显示Javadoc

Question

I have recently got a new computer and I have put Eclipse Helios on there. Before, on my old computer, when I used the control-assist (Ctrl + Space) and highlighted the suggested methods, the Javadoc for that method used to appear at the side of the control assist pop up window with the method description and parameters etc...

However, on my new computer this Javadoc doesn't appear and only the method suggestions appear - but even the arguments for the methods aren't named (they're just called arg0 , arg1 and so on). The only thing I can think of that is different on the new install is ZoneAlarm but as far as I can see I have allowed eclipse through the firewall; unless it's something to do with Java itself.

This feature is really useful to me so any advice on how to resolve this issue would be greatly appreciated. Thanks in advance.

Answer 1

Eclipse is using a JRE instead of a JDK as the default Java.

• Download and install a JDK.
• In Eclipse Preferences, Java -> Installed JRE's. Use "Add" or "Search" to locate and add the JDK just installed.
• Move the check mark indicating the default Java to the newly found JDK.
• Allow the workspace to rebuild.

Answer 2

You need to press F3 on the Class or Method name you want to see javadoc for. Then in the editor it's source will open or if you don't have source attached, you'll have screen with bytecode saying that no sources attached. Then you need to open package view, by default it's on the left side. On the top of it there is an icon with two arrows, if it's not pressed, press it. It will show source you've opened in the package view, then you need to find jar file containing your source by scrolling up if you already don't stand on it.

Now press right mouse button on that jar, you'll see properties window. Select javadoc, then you need to select location of the javadoc. You can provide a URL to an online javadoc. The URL you will be pointing to must provide a page named 'index.html' or similar or Eclipse won't allow you to use that URL. Also you can download javadoc locally and then select the location of that javadoc archive. If you need the javadoc for java SE libraries, you can find it in your jdk installation directory in src.zip folder. Hope it'll help.

Answer 3

Did you specify the javadoc location of your library?

Window -> Preferences -> Java -> Installed JREs -> Select your JRE -> Edit -> Select .jar file(s) (rt.jar) -> Javadoc Location