}      // Return deadlocked threads or null    public Long[][] getDeadlockedThreadIds() throws IOException {        ProxyClient proxyClient = vmPanel.getProxyClient();        ThreadMXBean threadMBean = proxyClient.getThreadMXBean();         long[] ids = proxyClient.findDeadlockedThreads();        if (ids == null) {            return null;        }        ThreadInfo[] infos = threadMBean.getThreadInfo(ids, Integer.MAX_VALUE);         List<Long[]> dcycles = new ArrayList<Long[]>();        List<Long> cycle = new ArrayList<Long>();         // keep track of which thread is visited        // one thread can only be in one cycle        boolean[] visited = new boolean[ids.length];         int deadlockedThread = -1; // Index into arrays        while (true) {            if (deadlockedThread < 0) {                if (cycle.size() > 0) {                    // a cycle found                    dcycles.add(cycle.toArray(new Long[0]));                    cycle = new ArrayList<Long>();                }                // start a new cycle from a non-visited thread                for (int j = 0; j < ids.length; j++) {                    if (!visited[j]) {                        deadlockedThread = j;                        visited[j] = true;                        break;                    }                }                if (deadlockedThread < 0) {                    // done                    break;                }            }             cycle.add(ids[deadlockedThread]);            long nextThreadId = infos[deadlockedThread].getLockOwnerId();            for (int j = 0; j < ids.length; j++) {                ThreadInfo ti = infos[j];                if (ti.getThreadId() == nextThreadId) {                     if (visited[j]) {                         deadlockedThread = -1;                     } else {                         deadlockedThread = j;                         visited[j] = true;                     }                     break;                }            }        }        return dcycles.toArray(new Long[0][0]);    }         // ActionListener interface    public void actionPerformed(ActionEvent evt) {        String cmd = ((AbstractButton)evt.getSource()).getActionCommand();         if (cmd == "detectDeadlock") {            messageLabel.setText("");            detectDeadlock();        }    }       // DocumentListener interface     public void insertUpdate(DocumentEvent e) {        doUpdate();    }     public void removeUpdate(DocumentEvent e) {        doUpdate();    }     public void changedUpdate(DocumentEvent e) {        doUpdate();    }       private class ThreadJList extends JList {        private JTextArea textArea;         ThreadJList(DefaultListModel listModel, JTextArea textArea) {            super(listModel);             this.textArea = textArea;             setBorder(thinEmptyBorder);             addListSelectionListener(ThreadTab.this);            setCellRenderer(new DefaultListCellRenderer() {                public Component getListCellRendererComponent(JList list, Object value, int index,                                                              boolean isSelected, boolean cellHasFocus) {                    super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);                     if (value != null) {                        String name = nameCache.get(value);                        if (name == null) {                            name = value.toString();                        }                        setText(name);                    }                    return this;                }            });        }         public Dimension getPreferredSize() {            Dimension d = super.getPreferredSize();            d.width = Math.max(d.width, 100);            return d;        }    }     private class PromptingTextField extends JTextField implements FocusListener {        private String prompt;        boolean promptRemoved = false;        Color fg;         public PromptingTextField(String prompt, int columns) {            super(prompt, columns);             this.prompt = prompt;            updateForeground();            addFocusListener(this);            setAccessibleName(this, prompt);        }         @Override        public void revalidate() {            super.revalidate();            updateForeground();        }         private void updateForeground() {            this.fg = UIManager.getColor("TextField.foreground");            if (promptRemoved) {                setForeground(fg);            } else {                setForeground(Color.gray);            }        }         public String getText() {            if (!promptRemoved) {                return "";            } else {                return super.getText();            }        }         public void focusGained(FocusEvent e) {            if (!promptRemoved) {                setText("");                setForeground(fg);                promptRemoved = true;            }        }         public void focusLost(FocusEvent e) {            if (promptRemoved && getText().equals("")) {                setText(prompt);                setForeground(Color.gray);                promptRemoved = false;            }        }     }     OverviewPanel[] getOverviewPanels() {        if (overviewPanel == null) {            overviewPanel = new ThreadOverviewPanel();        }        return new OverviewPanel[] { overviewPanel };    }      private static class ThreadOverviewPanel extends OverviewPanel {        ThreadOverviewPanel() {            super(getText("Threads"), threadCountKey, threadCountName, null);        }         private void updateThreadsInfo(long tlCount, long tpCount, long ttCount, long timeStamp) {            getPlotter().addValues(timeStamp, tlCount);            getInfoLabel().setText(getText(infoLabelFormat, tlCount, tpCount, ttCount));        }    }}

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