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strange "String index out of range: 0" error

Answer 1

+3 A:

My first guess would be that you have an empty string "", of which you are trying to get the first character (at index 0)

Jorn 2010-03-04 13:50:28

Answer 2

A:

http://www.mail-archive.com/[email protected]/msg10734.html

Voytek Jarnot 2010-03-04 13:51:16

Oh, and next time I would recommend sprinkling 3 minutes of googling somewhere near the beginning of the 2 hours of debugging ;)

Voytek Jarnot 2010-03-04 13:55:52

I've done debugging to FIND the property which can be null or empty not because i did not understand the error ;)

Cristian Boariu 2010-03-04 13:58:15

Since the feelings of the hivemind were obviously hurt, how about another 2 minute google answer:Wherever you're redirecting to obviously has a blank viewId:ViewHandlerImpl.java: if (viewId.charAt(0) != '/') {

Voytek Jarnot 2010-03-04 14:16:24

Answer 3

+10 A:

Let's check what ViewHandlerImpl#getActionURL() does (Mojarra is just open source). Here's is a summarized/stripped extract of the method as it is in Mojarra 2.0.2:

public String getActionURL(FacesContext context, String viewId) {
    if (context == null) throw new NullPointerException();
    if (viewId == null) throw new NullPointerException();
    if (viewId.charAt(0) != '/') throw new IllegalArgumentException();
    // ...

In other words, the passed-in viewId is an empty string instead of null or / or the normal path. The Mojarra viewhandler didn't expect it at all, hence this runtime exception. It can be a bug in the view handler of Mojarra that it should handle empty strings as well, but it can also be a bug in the view handler of either Ajax4jsf, Facelets or Seam that it should never pass an empty string through up. It can also be a bug in your own code that you're actually passing an empty string as view ID.

If the problem isn't in your code, then I would start with upgrading what can be upgraded to see if it resolves the problem. Maybe it was already reported before as a bug and fixed in a newer release. If that doesn't help, I would check the classpath for duplicate JAR files of different versions which might have collided with each other.

BalusC 2010-03-04 14:04:33

Thanks BalusC. I've clearly put a non empty string in the viewId and with debug i 've double checked:redirect.setViewId(portalConfiguration.getInboxPage()); which is not null and not empty....

Cristian Boariu 2010-03-04 14:28:29

Of course....there i had a property on that viewId to which i redirect, which was null !!! Oh.................................Thanks Balus for you answer.

Cristian Boariu 2010-03-04 14:55:36

...is it too much to hope that someone will update the Mojarra source to handle this case?

Alex Feinman 2010-06-18 17:33:31

@Alex: they can at highest add an extra check and throw a more clarifying exception instead. To get them to add that you'll need to post an [issue](https://javaserverfaces.dev.java.net/issues/). I've done it for you: [issue 1712](https://javaserverfaces.dev.java.net/issues/show_bug.cgi?id=1712).

BalusC 2010-06-18 17:45:33

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