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https://issues.apache.org/jira/browse/WW-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667828#comment-13667828
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Lukasz Lenart commented on WW-4066:
-----------------------------------

[~jstrom] in my opinion your case is a bit different, please take a look on 
WW-4068 and if this is not enough please register a new issue with sample Maven 
based app (preferable).

The mentioned ERROR is visible just in DevMode and I think it should be lowered 
to WARN (as it is just a developer warn), but if you could prepare a demo app I 
can look into deeper.
                
> Submitting form with parameters using brackets while devMode=true yields 
> StringIndexOutOfBoundsException
> --------------------------------------------------------------------------------------------------------
>
>                 Key: WW-4066
>                 URL: https://issues.apache.org/jira/browse/WW-4066
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Core Actions
>    Affects Versions: 2.3.14
>            Reporter: Chris Cranford
>            Assignee: Lukasz Lenart
>             Fix For: 2.3.16
>
>         Attachments: testcase.zip
>
>
> Our BaseAction which extends ActionSupport overrides the addActionMessage() 
> with the following:
> {code:java}
> @Override
> public void addActionMessage(String message) {
>   super.addActionMessage(getText(message));
> }
> {code}
> With the above method in place during devMode=true, the following error stack 
> trace occurs:
> {noformat}
> java.lang.StringIndexOutOfBoundsException: String index out of range: -1
>   at java.lang.String.substring(String.java:1871)
>   at 
> com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:426)
>   at 
> com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:362)
>   at 
> com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:208)
>   at 
> com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:123)
>   at com.opensymphony.xwork2.ActionSupport.getText(ActionSupport.java:103)
>   at com.setech.dw.common.web.BaseAction.addActionMessage(BaseAction.java:209)
>   at 
> com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:337)
>   at 
> com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:241)
> {noformat}

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