Bug 29003 Preferences 'Output Folder Name' needs to allow '/' in the path [build path]
In the window/preferences/Java/New Project panel, when 'Folders' radio button is set, the 'output folder name' cannot be set to something like 'WEB- INF/classes'. The error message "'/' is an invalid character" appears. However, when setting the output path on the project (project/properties), 'WEB- INF/classes' is allowed, as the '/' is valid. Please change the window/preferences to allow a '/' in output folder name, so this value can be set by default.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/NewJavaProjectPreferencePage.java
GridLayout layout= new GridLayout();
		layout.marginHeight= convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
		layout.marginWidth= 0;
		layout.verticalSpacing= convertVerticalDLUsToPixels(10);
		layout.horizontalSpacing= convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
		layout.numColumns= 2;
		result.setLayout(layout);
		
		GridData gd= new GridData(GridData.FILL_HORIZONTAL);
		gd.horizontalSpan= 2;
		
		Group sourceFolderGroup= new Group(result, SWT.WRAP);
		layout= new GridLayout();
		layout.numColumns= 2;
		sourceFolderGroup.setLayout(layout);
		sourceFolderGroup.setLayoutData(gd);
		sourceFolderGroup.setText(JavaUIMessages.getString("NewJavaProjectPreferencePage.sourcefolder.label")); 
		
		int indent= 0;
		
		fProjectAsSourceFolder= addRadioButton(sourceFolderGroup, JavaUIMessages.getString("NewJavaProjectPreferencePage.sourcefolder.project"), SRCBIN_FOLDERS_IN_NEWPROJ, IPreferenceStore.FALSE, indent); 
		fProjectAsSourceFolder.addSelectionListener(fSelectionListener);
		fFoldersAsSourceFolder= addRadioButton(sourceFolderGroup, JavaUIMessages.getString("NewJavaProjectPreferencePage.sourcefolder.folder"), SRCBIN_FOLDERS_IN_NEWPROJ, IPreferenceStore.TRUE, indent); 
		fFoldersAsSourceFolder.addSelectionListener(fSelectionListener);
		
		indent= convertWidthInCharsToPixels(4);
		fSrcFolderNameLabel= new Label(sourceFolderGroup, SWT.NONE);
		fSrcFolderNameLabel.setText(JavaUIMessages.getString("NewJavaProjectPreferencePage.folders.src")); 
		fSrcFolderNameText= addTextControl(sourceFolderGroup, fSrcFolderNameLabel, SRCBIN_SRCNAME, indent); 
		fSrcFolderNameText.addModifyListener(fModifyListener);