java.lang.Error: Unexpected window shown - this window should be handled with WindowInterceptor

Subject: I am trying to run JUnit4 testcases via maven2 for Swings application.

JUnit Test Case: TableGuiUtilTest.java

@Override
    public void setUp() throws Exception {
        helper = new JFCTestHelper();

        tables = new JTable[NB_TABLES];
        int globalIndex = 0;
        for (int i = 0; i < tables.length; i++) {
            Object[][] rowData = new Object[][]{
                  {"1", "2", "3"},
                  {"4", "5", "6"},
            };
            Object[] columnNames = new Object[NB_COLUMNS_PER_TABLE];
            for (int j = 0; j < columnNames.length; j++, globalIndex++) {
                columnNames[j] = (char)('A' + globalIndex);
            }
            JTable table = new JTable(rowData, columnNames);
            table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
            for (int column = 0; column < table.getColumnCount(); column++) {
                table.getColumnModel().getColumn(column).setMaxWidth(COLUMN_WIDTH);
            }

            tables[i] = table;
        }

        JPanel content = new JPanel(new GridLayout(1, tables.length));
        for (JTable table : tables) {
            content.add(new JScrollPane(table));
        }

        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.setSize(NB_TABLES * NB_COLUMNS_PER_TABLE * COLUMN_WIDTH + 20, 100);
        frame.setContentPane(content);
        frame.setVisible(true);  //line# 63 Error: com.agf.outilfo.swing.table.typedTable.util.TableGuiUtilTest.setUp(TableGuiUtilTest.java:63)
    }


    @Override
    public void tearDown() throws Exception {
        helper = null;
        tables = null;
        frame.dispose();
        frame = null;
    }

Output error Stacktrace:

java.lang.Error: Unexpected window shown - this window should be handled with WindowInterceptor. 
    at org.uispec4j.interception.toolkit.UISpecDisplay.assertAcceptsWindow(UISpecDisplay.java:117)
    at org.uispec4j.interception.toolkit.UISpecDisplay.processWindow(UISpecDisplay.java:95)
    at org.uispec4j.interception.toolkit.UISpecDisplay.showFrame(UISpecDisplay.java:34)
    at org.uispec4j.interception.toolkit.UISpecDisplay.showFrame(UISpecDisplay.java:39)
    at org.uispec4j.interception.toolkit.UISpecFramePeer.show(UISpecFramePeer.java:13)
    at org.uispec4j.interception.toolkit.Empty$WindowPeeer.setVisible(Empty.java:240)
    at org.uispec4j.interception.toolkit.UISpecFramePeer.setVisible(UISpecFramePeer.java:5)
    at java.awt.Component.show(Component.java:1621)
    at java.awt.Window.show(Window.java:1042)
    at java.awt.Component.show(Component.java:1654)
    at java.awt.Component.setVisible(Component.java:1606)
    at java.awt.Window.setVisible(Window.java:1014)
    at com.agf.outilfo.swing.table.typedTable.util.TableGuiUtilTest.setUp(TableGuiUtilTest.java:63)
    at junit.extensions.jfcunit.JFCTestCase$1.run(JFCTestCase.java:314)
    at junit.extensions.jfcunit.JFCTestCase$3.run(JFCTestCase.java:478)
    at java.lang.Thread.run(Thread.java:745)  

Error stack trace is pointing to: frame.setVisible(true);

Note: If I run testcase directly with JUnit in eclipse, I am able to get the pop-up window. But, while maven, it is getting above error.