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Asked: 2026-06-02T20:19:12+00:00

I’m using sax parser to get xml data, the below code is causing my

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I’m using sax parser to get xml data, the below code is causing my app to crash. 

    try {
        url = new URL("The URL");
    } catch (MalformedURLException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
   // RssFeed feed = null;
    try {
        feed = RssReader.read(url);
    } catch (SAXException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Looks like it is crashing at feed = RssReader.read(url); It works fine on my evo but when I install it on my hero the below error occurs

04-28 15:57:53.458: E/AndroidRuntime(2749): Uncaught handler: thread main exiting due to uncaught  exception
04-28 15:57:53.589: E/AndroidRuntime(2749): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mlgw.mlgwapp/com.mlgw.mlgwapp.TipsActivity}: java.lang.StringIndexOutOfBoundsException
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.ActivityThread.startActivityNow(ActivityThread.java:2411)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:648)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.widget.TabHost.setCurrentTab(TabHost.java:320)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:129)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:379)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.View.performClick(View.java:2364)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.View.onTouchEvent(View.java:4179)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.View.dispatchTouchEvent(View.java:3709)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:874)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1695)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1116)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.Activity.dispatchTouchEvent(Activity.java:2068)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1679)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1697)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.os.Looper.loop(Looper.java:123)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.ActivityThread.main(ActivityThread.java:4595)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at java.lang.reflect.Method.invokeNative(Native Method)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at java.lang.reflect.Method.invoke(Method.java:521)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at dalvik.system.NativeStart.main(Native Method)
04-28 15:57:53.589: E/AndroidRuntime(2749): Caused by: java.lang.StringIndexOutOfBoundsException
04-28 15:57:53.589: E/AndroidRuntime(2749):     at java.lang.String.substring(String.java:1646)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at nl.matshofman.saxrssreader.RssHandler.endElement(RssHandler.java:67)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at org.apache.harmony.xml.ExpatParser.endElement(ExpatParser.java:159)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at org.apache.harmony.xml.ExpatParser.append(Native Method)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at org.apache.harmony.xml.ExpatParser.parseFragment(ExpatParser.java:506)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at org.apache.harmony.xml.ExpatParser.parseDocument(ExpatParser.java:467)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:329)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:286)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at nl.matshofman.saxrssreader.RssReader.read(RssReader.java:43)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at com.mlgw.mlgwapp.TipsActivity.onCreate(TipsActivity.java:57)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-28 15:57:53.589: E/AndroidRuntime(2749):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544)

Please Help!!

Here is my RssHandler class

package nl.matshofman.saxrssreader;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

public class RssHandler extends DefaultHandler {

private RssFeed rssFeed;
private RssItem rssItem;
private StringBuilder stringBuilder;

@Override
public void startDocument() {
    rssFeed = new RssFeed();
}

/**
 * Return the parsed RssFeed with it's RssItems
 * @return
 */
public RssFeed getResult() {
    return rssFeed;
}

@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) {
    stringBuilder = new StringBuilder();

    if(qName.equals("item") && rssFeed != null) {
        rssItem = new RssItem();
        rssItem.setFeed(rssFeed);
        rssFeed.addRssItem(rssItem);
    }
}

@Override
public void characters(char[] ch, int start, int length) {
    stringBuilder.append(ch, start, length);
}

@Override
public void endElement(String uri, String localName, String qName) {

    if(rssFeed != null && rssItem == null) {
        // Parse feed properties

        try {
            String methodName = "set" + qName.substring(0, 1).toUpperCase() + qName.substring(1);
            Method method = rssFeed.getClass().getMethod(methodName, String.class);
            method.invoke(rssFeed, stringBuilder.toString());
        } catch (SecurityException e) {
        } catch (NoSuchMethodException e) {
        } catch (IllegalArgumentException e) {
        } catch (IllegalAccessException e) {
        } catch (InvocationTargetException e) {
        }

    } else if (rssItem != null) {
        // Parse item properties

        try {
            if(qName.equals("content:encoded")) 
                qName = "content";
            String methodName = "set" + qName.substring(0, 1).toUpperCase() + qName.substring(1);
            Method method = rssItem.getClass().getMethod(methodName, String.class);
            method.invoke(rssItem, stringBuilder.toString());
        } catch (SecurityException e) {
        } catch (NoSuchMethodException e) {
        } catch (IllegalArgumentException e) {
        } catch (IllegalAccessException e) {
        } catch (InvocationTargetException e) {
        }
    }

}

}
ok I added that now there is this

04-28 18:49:35.189: E/AndroidRuntime(3780): Uncaught handler: thread main exiting due to uncaught exception
04-28 18:49:35.328: E/AndroidRuntime(3780): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mlgw.mlgwapp/com.mlgw.mlgwapp.TipsActivity}: java.lang.IllegalArgumentException
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.ActivityThread.startActivityNow(ActivityThread.java:2411)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:648)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.widget.TabHost.setCurrentTab(TabHost.java:320)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:129)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:379)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.View.performClick(View.java:2364)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.View.onTouchEvent(View.java:4179)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.View.dispatchTouchEvent(View.java:3709)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:874)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:924)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1695)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1116)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.Activity.dispatchTouchEvent(Activity.java:2068)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1679)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1697)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.os.Looper.loop(Looper.java:123)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.ActivityThread.main(ActivityThread.java:4595)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at java.lang.reflect.Method.invokeNative(Native Method)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at java.lang.reflect.Method.invoke(Method.java:521)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at dalvik.system.NativeStart.main(Native Method)
04-28 18:49:35.328: E/AndroidRuntime(3780): Caused by: java.lang.IllegalArgumentException
04-28 18:49:35.328: E/AndroidRuntime(3780):     at java.util.Random.nextInt(Random.java:221)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at com.mlgw.mlgwapp.TipsActivity.onCreate(TipsActivity.java:71)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-28 18:49:35.328: E/AndroidRuntime(3780):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544)
04-28 18:49:35.328: E/AndroidRuntime(3780):     ... 30 more

Now seems to have somethig to do with the round function I’m using.

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1 Answer

  1. Editorial Team

    The stacktrace tells you the cause of the error:

    Caused by: java.lang.StringIndexOutOfBoundsException
     at java.lang.String.substring(String.java:1646)
     at nl.matshofman.saxrssreader.RssHandler.endElement(RssHandler.java:67)

    The actual error happens in java.lang.String.substring() which is not your code so you can’t fix anything there. But the next line tells you where substring was called. RssHandler.java in line 67, in method endElement

    That should be:

    String methodName = "set" + qName.substring(0, 1).toUpperCase() + qName.substring(1)

    String indexes are their characters so you access qName although it is empty and you can’t build a substring from just the first character or starting after the first character.

    To prevent the crash you can do

    if (qName != null && qName.length() > 0) {
    String methodName = "set" + qName.substring(0, 1).toUpperCase() + qName.substring(1);
    Method method = rssFeed.getClass().getMethod(methodName, String.class);
    method.invoke(rssFeed, stringBuilder.toString());
}

    and you should have a look at the XML and find out why there is a qName that does not fit the expected format.

    Also localName might be better to check since the qualified name of <xsl:template /> is xsl:template while the local name is just template.

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