No completions available, strange Eclipse behavior

Question

I think I tried every suggested solution, but this Eclipse auto-complete problem is quite particular:

1. I launch Eclipse, content assist works fine;
2. I want to create a LineBorder in my Swing project;
3. I type LineBorder panelBorder = new Li and hit Ctrl+Space;
4. No popup appears and in the status bar it writes in red "No completion available";
5. I try Ctrl+Space on the elements where content assist worked fine 2 secs earlier, it doesn't work anymore.
6. I try the same thing on other project, on the same project after closing and reopening it, after cleaning it and content assist works just fine before I try using LineBorder constructor, then it crashes.

What I tried:

1. Reset to defaults in 'Preferences->Java->Editor->Content Assist->Advanced';
2. Check every single checkbox in the same menu;
3. Create a new workspace and try it there;
4. Delete .index files and 'savedIndexNames.txt' in .metadata/.plugins/org.eclipse.jdt.core;
5. Check for the duplicate libraries.

What I didn't try is reinstalling Eclipse. The version I use is Eclipse IDE for Java Developers (Juno).

Nothing seems to work.

UPDATE:

Checked the logs as iGili suggested. There are some exceptions raised at the time of failure:

org.eclipse.e4.core.di.InjectionException: org.eclipse.core.commands.ExecutionException: While executing the action, an exception occurred
Caused by: org.eclipse.core.commands.ExecutionException: While executing the action, an exception occurred
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
    at org.eclipse.jdt.internal.codeassist.InternalCompletionProposal.findConstructorParameterNames(InternalCompletionProposal.java:257)
    at org.eclipse.jdt.internal.codeassist.InternalCompletionProposal.findParameterNames(InternalCompletionProposal.java:1456)
    at org.eclipse.jdt.ui.text.java.CompletionProposalLabelProvider.appendUnboundedParameterList(CompletionProposalLabelProvider.java:113)
    at org.eclipse.jdt.ui.text.java.CompletionProposalLabelProvider.createMethodProposalLabel(CompletionProposalLabelProvider.java:272)
    at org.eclipse.jdt.ui.text.java.CompletionProposalLabelProvider.createStyledLabel(CompletionProposalLabelProvider.java:570)
    at org.eclipse.jdt.internal.ui.text.java.LazyJavaCompletionProposal.computeDisplayString(LazyJavaCompletionProposal.java:262)
    at org.eclipse.jdt.internal.ui.text.java.LazyJavaCompletionProposal.getStyledDisplayString(LazyJavaCompletionProposal.java:238)
    at org.eclipse.jface.text.contentassist.CompletionProposalPopup.handleSetData(CompletionProposalPopup.java:841)
    at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$24(CompletionProposalPopup.java:831)
    at org.eclipse.jface.text.contentassist.CompletionProposalPopup$3.handleEvent(CompletionProposalPopup.java:593)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
    at org.eclipse.swt.widgets.Table.checkData(Table.java:1166)
    at org.eclipse.swt.widgets.Table.wmNotifyChild(Table.java:6749)
    at org.eclipse.swt.widgets.Control.wmNotify(Control.java:5534)
    at org.eclipse.swt.widgets.Composite.wmNotify(Composite.java:1896)
    at org.eclipse.swt.widgets.Control.WM_NOTIFY(Control.java:5086)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4584)
    at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341)
    at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1627)
    at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2069)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4989)
    at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
    at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2440)
    at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:564)
    at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:430)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4623)

and it goes on, I don't know what is the convention for posting long stack traces

Answer 1

I had the same problem. Actually I had the content assist pop up, but that was smaller than a couple of pixels.(Who shrunk this and why was it shrunk no idea whatsoever...) But if you see something strange(in my case, that was the letters 'Rp', but I guess it can be anything) where normally the content assist should appear, try to expand it, and you might get it back. Good luck.