Is there an Eclipse line-width marker?

Look in Windows / Preferences (at least on Windows - IIRC it moves around for different operating systems) then:

General -> Editors -> Text Editors -> Show Print Margin

Tick this and it should show the line.

As a quick way of finding this, use the search filter in the top and filter on "margin".

Notes from the comments - unverified by me, but I have no reason to doubt them:

It has changed somehow in 2016: For details see [here] (https://bugs.eclipse.org/bugs/show_bug.cgi?id=495490#c2) You have to set it in the formatter: From menu [Window]-->[Preferences], select [Java]-->[Code Style]-->[Formatter], and then edit your formatter profile. In the tab page [Line wrapping], you can find a setting named "Maximum line width". Change this setting, and the print margin in Java source editor will be changed too.

In Eclipse Luna (4.4): Choose menu Window\Preference . Look at top-left corner, in search box type filter text, type: margin.



In section Apperance color option, Choose Print margin. Choose Show print margin. In text box Print margin column , type 65 as what you want.