JScrollPane doesn't work?

[ecliptical]

Hi again,

While writing my GUI I tried to make a JScrollPane by looking through the API. When running my program however it does not work.

Here's the code I used to create a JScrollPane...

    
    panel5 = new JPanel();
    //Panel for getting info on student
    studentNameLabel2 = new JLabel("Student Info is displayed here");
    studentInfo = new JTextArea();
    studentInfo.setColumns(20);
    studentInfo.setLineWrap(true);
    studentInfo.setRows(5);
    studentInfo.setWrapStyleWord(true);
    studentInfo.setEditable(false);
    studentInfoScroll = new JScrollPane(studentInfo);

    panel5.add(studentNameLabel2);
    panel5.add(studentInfoScroll);
    panel5.add(studentInfo);

Any ideas as to why the JScrollPane isn't showing?

Thanks in advance,
Ecliptical.

[Fubarable]

Is the scroll pane's viewport smaller than the JPanel that it holds? Probably not, and if not, no scrollbars will appear.

[quad64bit]

I suspect that you forgot to add the panel to your gui, or you have a strange layout manager set, or the default layout manager is hiding your panel, or you have a strange size set for the scrollPane, etc. I'd need to see more of the code to be sure - what you have appears to be ok.

[ecliptical]

For my GUI driver class, it calls the primary panel which is coded as follows.

    
    tabbedPanel = new JTabbedPane();
    add(tabbedPanel);
    tabbedPanel.addTab("Add/Remove Student", null, panel1, "Accepts a student into the database");
    tabbedPanel.addTab("Calculate Grades", null, panel4, "Displays the student's grades");
    //tabbedPanel.addTab("Manage Students", null, panel3, "Manages students");
    tabbedPanel.addTab("Student Info", null, panel5, "Gets student Info");
    tabbedPanel.addTab("Add/Remove Teacher", null, panel2, "Hires/Fires a Teacher");
    tabbedPanel.addTab("Teacher Info", null, panel6, "Displays info on Teachers");
    tabbedPanel.addTab("Edit Teachers", null, panel7, "Manages Teachers");
    
    primary = new JPanel();
    primary.setBackground (Color.white);
    primary.setPreferredSize (new Dimension(500, 675));
    primary.setLayout( new BorderLayout() );
    primary.add( tabbedPanel, BorderLayout.CENTER );

Is there any conflict here as to why the scroll bar is not showing?
My GUI consists of JTabbedPanes as well.

[Fubarable]

Have you tested my suggestion? Have you even read what I wrote? It's a simple matter of calling System.out.println(whatever.getSize()) (but only after the components have been rendered by calling either pack() or setVisible(true) on the JFrame) to see what is the actual size of the component held in the JScrollPane vs the JScrollPane's viewport? Alternatively you could set the preferredSize of the component held by the scrollpane to a large dimension to see if scrollpanes show up.