App works fine on simulator but showing NullPointerException in device

[khanhdq...@gmail.com]

Hi,
My app works fine on simulatior but sometimes it's showing NullPointerException in my device.
I have a List of containers. NPE happens sometimes if i scroll this list.
Can someone please let me know what's the problem?
Thanks a lot.

This is my stack trace :

03-25 23:29:04.150: W/System.err(22214): java.lang.NullPointerException
03-25 23:29:04.155: W/System.err(22214):     at com.codename1.ui.TextArea.initRowString(TextArea.java:971)
03-25 23:29:04.155: W/System.err(22214):     at com.codename1.ui.TextArea.getRowStrings(TextArea.java:684)
03-25 23:29:04.155: W/System.err(22214):     at com.codename1.ui.TextArea.getLines(TextArea.java:698)
03-25 23:29:04.155: W/System.err(22214):     at com.codename1.ui.TextArea.getActualRows(TextArea.java:643)
03-25 23:29:04.155: W/System.err(22214):     at com.codename1.ui.plaf.DefaultLookAndFeel.getTextAreaSize(DefaultLookAndFeel.java:869)
03-25 23:29:04.155: W/System.err(22214):     at com.codename1.ui.TextArea.calcPreferredSize(TextArea.java:1033)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Component.preferredSize(Component.java:1731)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Component.getPreferredSize(Component.java:627)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Component.getPreferredH(Component.java:713)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.layouts.BoxLayout.layoutContainer(BoxLayout.java:91)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Container.doLayout(Container.java:1028)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Container.layoutContainer(Container.java:1020)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Container.doLayout(Container.java:1033)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Container.layoutContainer(Container.java:1020)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.Container.revalidate(Container.java:827)
03-25 23:29:04.160: W/System.err(22214):     at com.codename1.ui.list.GenericListCellRenderer.setComponentValue(GenericListCellRenderer.java:484)
03-25 23:29:04.165: W/System.err(22214):     at com.codename1.ui.list.GenericListCellRenderer.getCellRendererComponent(GenericListCellRenderer.java:344)
03-25 23:29:04.165: W/System.err(22214):     at com.codename1.ui.list.GenericListCellRenderer.getListCellRendererComponent(GenericListCellRenderer.java:396)
03-25 23:29:04.165: W/System.err(22214):     at userclasses.StateMachine$1.getListCellRendererComponent(StateMachine.java:108)
03-25 23:29:04.165: W/System.err(22214):     at com.codename1.ui.List.setShouldCalcPreferredSize(List.java:562)
03-25 23:29:04.165: W/System.err(22214):     at com.codename1.ui.List.dataChanged(List.java:571)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.List$Listeners.dataChanged(List.java:732)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.util.EventDispatcher.fireDataChangeSync(EventDispatcher.java:309)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.util.EventDispatcher.access$600(EventDispatcher.java:41)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.util.EventDispatcher$CallbackClass.run(EventDispatcher.java:111)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.Display.processSerialCalls(Display.java:1075)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.Display.edtLoopImpl(Display.java:1019)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.Display.mainEDTLoop(Display.java:925)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
03-25 23:29:04.170: W/System.err(22214):     at com.codename1.impl.CodenameOneThread$1.run(CodenameOneThread.java:60)
03-25 23:29:04.170: W/System.err(22214):     at java.lang.Thread.run(Thread.java:841)
03-25 23:29:04.175: W/ResourceType(22214): No package identifier when getting value for resource number 0x00000000

[Shai Almog]

Hi,
it looks like you have an EDT violation somewhere along the way. Did you run with the EDT violation detection code in the simulator?

[khanhdq...@gmail.com]

Hi,
I click on the List in Component Inspector and got this EDT error :

EDT violation detected!
com.codename1.impl.javase.JavaSEPort$EDTViolation: EDT Violation Stack!
    at com.codename1.impl.javase.JavaSEPort.checkEDT(JavaSEPort.java:358)
    at com.codename1.impl.javase.JavaSEPort.isNativeInputSupported(JavaSEPort.java:2479)
    at com.codename1.ui.Display.isNativeInputSupported(Display.java:2306)
    at com.codename1.ui.TextArea.setText(TextArea.java:406)
EDT violation detected!
    at com.codename1.ui.list.GenericListCellRenderer.setComponentValue(GenericListCellRenderer.java:520)
    at com.codename1.ui.list.GenericListCellRenderer.getCellRendererComponent(GenericListCellRenderer.java:342)
    at com.codename1.ui.list.GenericListCellRenderer.getListCellRendererComponent(GenericListCellRenderer.java:394)
    at userclasses.StateMachine$1.getListCellRendererComponent(StateMachine.java:108)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getListPreferredSizeImpl(DefaultLookAndFeel.java:777)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getListPreferredSize(DefaultLookAndFeel.java:731)
    at com.codename1.ui.List.calcPreferredSize(List.java:2025)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredW(Component.java:703)
    at com.codename1.ui.layouts.BorderLayout.getPreferredSize(BorderLayout.java:372)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredW(Component.java:703)
    at com.codename1.impl.javase.ComponentTreeInspector$2.valueChanged(ComponentTreeInspector.java:78)
    at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:634)
    at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1092)
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:293)
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelectionModel.java:187)
    at javax.swing.JTree.setSelectionPath(JTree.java:1631)
    at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2373)
    at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3589)
    at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3528)
    at java.awt.Component.processMouseEvent(Component.java:6502)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6270)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4861)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4489)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:688)
    at java.awt.EventQueue$3.run(EventQueue.java:686)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:702)
    at java.awt.EventQueue$4.run(EventQueue.java:700)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
com.codename1.impl.javase.JavaSEPort$EDTViolation: EDT Violation Stack!
    at com.codename1.impl.javase.JavaSEPort.checkEDT(JavaSEPort.java:358)
    at com.codename1.impl.javase.JavaSEPort.stringWidth(JavaSEPort.java:3690)
    at com.codename1.ui.Font.stringWidth(Font.java:346)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getPreferredSize(DefaultLookAndFeel.java:678)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getLabelPreferredSize(DefaultLookAndFeel.java:648)
    at com.codename1.ui.Label.calcPreferredSize(Label.java:345)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredH(Component.java:713)
    at com.codename1.ui.layouts.BoxLayout.getPreferredSize(BoxLayout.java:170)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
EDT violation detected!
    at com.codename1.ui.Component.getPreferredH(Component.java:713)
    at com.codename1.ui.layouts.BoxLayout.getPreferredSize(BoxLayout.java:170)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredH(Component.java:713)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getListPreferredSizeImpl(DefaultLookAndFeel.java:783)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getListPreferredSize(DefaultLookAndFeel.java:731)
    at com.codename1.ui.List.calcPreferredSize(List.java:2025)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredW(Component.java:703)
    at com.codename1.ui.layouts.BorderLayout.getPreferredSize(BorderLayout.java:372)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredW(Component.java:703)
    at com.codename1.impl.javase.ComponentTreeInspector$2.valueChanged(ComponentTreeInspector.java:78)
    at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:634)
    at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1092)
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:293)
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelectionModel.java:187)
    at javax.swing.JTree.setSelectionPath(JTree.java:1631)
    at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2373)
    at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3589)
    at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3528)
    at java.awt.Component.processMouseEvent(Component.java:6502)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6270)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4861)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4489)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:688)
    at java.awt.EventQueue$3.run(EventQueue.java:686)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:702)
    at java.awt.EventQueue$4.run(EventQueue.java:700)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
com.codename1.impl.javase.JavaSEPort$EDTViolation: EDT Violation Stack!
    at com.codename1.impl.javase.JavaSEPort.checkEDT(JavaSEPort.java:358)
    at com.codename1.impl.javase.JavaSEPort.getHeight(JavaSEPort.java:3709)
    at com.codename1.ui.Font.getHeight(Font.java:365)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getPreferredSize(DefaultLookAndFeel.java:679)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getLabelPreferredSize(DefaultLookAndFeel.java:648)
    at com.codename1.ui.Label.calcPreferredSize(Label.java:345)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredH(Component.java:713)
    at com.codename1.ui.layouts.BoxLayout.getPreferredSize(BoxLayout.java:170)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredH(Component.java:713)
EDT violation detected!
    at com.codename1.ui.layouts.BoxLayout.getPreferredSize(BoxLayout.java:170)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredH(Component.java:713)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getListPreferredSizeImpl(DefaultLookAndFeel.java:783)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getListPreferredSize(DefaultLookAndFeel.java:731)
    at com.codename1.ui.List.calcPreferredSize(List.java:2025)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredW(Component.java:703)
    at com.codename1.ui.layouts.BorderLayout.getPreferredSize(BorderLayout.java:372)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredW(Component.java:703)
    at com.codename1.impl.javase.ComponentTreeInspector$2.valueChanged(ComponentTreeInspector.java:78)
    at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:634)
    at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1092)
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:293)
    at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelectionModel.java:187)
    at javax.swing.JTree.setSelectionPath(JTree.java:1631)
    at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2373)
    at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3589)
    at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3528)
    at java.awt.Component.processMouseEvent(Component.java:6502)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6270)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4861)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4489)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:688)
    at java.awt.EventQueue$3.run(EventQueue.java:686)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:702)
    at java.awt.EventQueue$4.run(EventQueue.java:700)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
com.codename1.impl.javase.JavaSEPort$EDTViolation: EDT Violation Stack!
    at com.codename1.impl.javase.JavaSEPort.checkEDT(JavaSEPort.java:358)
    at com.codename1.impl.javase.JavaSEPort.charWidth(JavaSEPort.java:3701)
    at com.codename1.ui.Font.charWidth(Font.java:356)
    at com.codename1.ui.plaf.DefaultLookAndFeel.getTextAreaSize(DefaultLookAndFeel.java:865)
    at com.codename1.ui.TextArea.calcPreferredSize(TextArea.java:1033)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredH(Component.java:713)
    at com.codename1.ui.layouts.BoxLayout.getPreferredSize(BoxLayout.java:170)
    at com.codename1.ui.Container.calcPreferredSize(Container.java:1428)
    at com.codename1.ui.Component.preferredSize(Component.java:1731)
    at com.codename1.ui.Component.getPreferredSize(Component.java:627)
    at com.codename1.ui.Component.getPreferredH(Component.java:713)

Below is my code :

private void populateArticleList(Form f) {
        final Resources res = fetchResourceFile();
        final List list = findList(f);
        int thumbWidth = Display.getInstance().getDisplayWidth() / 2;
        int thumbHeight = (int) (thumbWidth / 1.52);
        final Dimension thumbSize = new Dimension(thumbWidth, thumbHeight);
        Component selected = createContainer(res, "LoopData");
        Component unselected = createContainer(res, "LoopData");
        list.setRenderer(new GenericListCellRenderer(selected, unselected) {
            public Component getListCellRendererComponent(List list, Object value, int index, boolean isSelected) {
                if (list.size() < 1) {
                    fetchMore(list, "");
                } else {
                    if ((index + 5) >= list.size()) {
                        HashMap h = (HashMap) list.getModel().getItemAt(list.size() - 1);
                        if (h != null) {
                            String nextpagelink = (String) h.get("nextpagelink");
                            if (nextpagelink != null) {
                                fetchMore(list, nextpagelink);
                            }
                        }
                    }
                }
                HashMap hm = (HashMap) list.getModel().getItemAt(index);
                if (hm != null) {
                    addAvatar(list, hm, index);
                }

                return super.getListCellRendererComponent(list, value, index, isSelected);
            }

            private void addAvatar(List list, HashMap hm, int i) {
                String url = hm.get("thumb").toString();
                String cacheId = hm.get("thumb").toString();
                Image img = (Image) hm.get("thumbimg");
                if (img == null && hm.get("fetching") == null) {
                    hm.put("fetching", Boolean.TRUE);
                    ImageDownloadService.createImageToStorage(url, list, i, "thumbimg", cacheId, thumbSize, PRIORITY_LOW);
                }
            }
        });
    }

    private void fetchMore(final List list, String nextpagelink) {
        System.out.println("Fetching more...");
        ContentService cs;
        cs = new ContentService() {
            @Override
            protected void readResponse(InputStream input) throws IOException {
                JSONParser p = new JSONParser();
                Map jsonData = p.parseJSON(new InputStreamReader(input));
                ArrayList arListArc = (ArrayList) jsonData.get("root");
                for (int i = 0; i < arListArc.size(); i++) {
                    try {
                        HashMap hm = (HashMap) arListArc.get(i);
                        list.addItem(hm);
                    } catch (Exception ex) {
                        System.out.println(ex.toString());
                    }
                }
            }

        };
        cs.setLink("http://www.baomoi.com/Home/GiaiTri.epi");
        if (nextpagelink != "") {
            cs.setLink(nextpagelink);
        }
        cs.setType("list");        
        NetworkManager.getInstance().addToQueue(cs);        
    }

[Shai Almog]

Hi,
due to obvious reasons the component inspector violates the EDT.

[khanhdq...@gmail.com]

Hi,
So there is no EDT violation.
This is my code, it's work fine on simulator but throw NullPointerException in my android device

[Shai Almog]

Hi,
do you have a stack trace or some other means of narrowing it down to an approximate area?
Its a bit much to compile in my head.

[khanhdq...@gmail.com]

Hi,
This problem is solved when I switch to use ListCellRenderer instead of GenericRenderer.

[Shai Almog]

Hi,
how are you using the generic list cell renderer?

[ba.kri...@gmail.com]

I have facing the same issue when add scroll property to the textarea. It works fine in simulator but throwing NPE when data added into the textarea.

...

[Shai Almog]

That doesn't sound related. I suggest opening a discussion of your own with a proper question and not reopening old threads.