Bug 51683 Occurences In Exceptions: Not Javadoc aware
20040211 - Enable 'Mark Occurences' - Open java.ui.FileInputStream, close() - In the Javadoc comment select 'IOException' - In the signature select 'IOException': Not the same result
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/ExceptionOccurrencesFinder.java
if (!(node instanceof Name)) {
			return SearchMessages.getString("ExceptionOccurrencesFinder.no_exception");  
		}
		fSelectedName= ASTNodes.getTopMostName((Name)node);
		ASTNode parent= fSelectedName.getParent();
		if (parent instanceof MethodDeclaration) {
			MethodDeclaration decl= (MethodDeclaration)parent;
			if (decl.thrownExceptions().contains(fSelectedName)) {
				fException= fSelectedName.resolveTypeBinding();
				fStart= decl.getBody();
			}
		} else if (parent instanceof Type) {
			parent= parent.getParent();
			if (parent instanceof SingleVariableDeclaration && parent.getParent() instanceof CatchClause) {
				CatchClause catchClause= (CatchClause)parent.getParent();
				TryStatement tryStatement= (TryStatement)catchClause.getParent();
				if (tryStatement != null) {
					IVariableBinding var= catchClause.getException().resolveBinding();
					if (var != null && var.getType() != null) {
						fException= var.getType();
						fStart= tryStatement.getBody();
					}
				}
			}
		}
		if (fException == null || fStart == null)
			return SearchMessages.getString("ExceptionOccurrencesFinder.no_exception");  
		return null;
	}