Is there a way to call java.lang.String.substring on a <c: out ?

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Posted to taglibs-user@tomcat.apache.org by Stefan <ni...@studioweb.com> on 2002/10/11 01:28:44 UTC

Is there a way to call java.lang.String.substring on a

Hi,

I would like to use substring on a c: out like so:

<c:out value="${value.activity.substring(0,4)}"/>

It works but at the same time I get this error:

500 Servlet Exception 
java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at com.caucho.el.MethodExpr.evalObject(MethodExpr.java:105)
	at com.caucho.el.Expr.print(Expr.java:207)
	at _testcode._jstl__jsp._jspService(/TESTCODE/jstl.jsp:103)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:485)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.caucho.server.http.Invocation.service(Invocation.java:312)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:221)
	at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:163)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:137)
	at java.lang.Thread.run(Thread.java:536)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out
of range: 4
	at java.lang.String.substring(String.java:1477)
	... 15 more

Any tips would be appreciated,
Stef

Re: Is there a way to call java.lang.String.substring on a Posted by Jungho Kim <ju...@sympatico.ca>.

The value of c:out is output to the JspWriter instance for the page at
runtime and as such it would not be possible to do what you are suggesting
from within a jsp page.  As Shawn suggested take a look at the String
taglib.  It actually has a tag called "substring".

regards,

Jungho
----- Original Message -----
From: "Stefan" <ni...@studioweb.com>
To: "Tag Libraries Users List" <ta...@jakarta.apache.org>
Sent: Thursday, October 10, 2002 10:15 PM
Subject: Re: Is there a way to call java.lang.String.substring on a <c: out
?


> Shawn,
>
> So is there a way to extract a sub string from the result of a <c:out
> value="${}}"/> tag?
>
> Thanks,
>
> Stef
>
>
>
>
> ----- Original Message -----
> From: "Shawn Bayern" <ba...@essentially.net>
> To: "Tag Libraries Users List" <ta...@jakarta.apache.org>
> Sent: Thursday, October 10, 2002 9:01 PM
> Subject: Re: Is there a way to call java.lang.String.substring on a <c:
out
> ?
>
>
> > On Thu, 10 Oct 2002, Stefan wrote:
> >
> > > Hi,
> > >
> > > I would like to use substring on a c: out like so:
> > >
> > >
> >
> > No, this can't be done in JSTL 1.0.  You'll be able to define functions
in
> > the EL in JSP 2.0, but for now, any attempt to do so should yield a
> > translation-time error, as the syntax isn't supported.
> >
> > > It works but at the same time I get this error:
> > >
> > > 500 Servlet Exception
> > > java.lang.reflect.InvocationTargetException
> > > at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
> > > at
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
> .java:25)
> > > at java.lang.reflect.Method.invoke(Method.java:324)
> > > at com.caucho.el.MethodExpr.evalObject(MethodExpr.java:105)
> >
> > You might want to mail the Caucho folks and ask them about this; their
> > implementation is different from Jakarta Taglibs's.  Note again that it
> > *shouldn't* work; if it does, then an implementation isn't
JSTL-compliant.
> >
> > You can use other tag libraries like the String Taglib to perform string
> > manipulation in your JSP pages.
> >
> > --
> > Shawn Bayern
> > "JSTL in Action"   http://www.jstlbook.com
> >
> >
> > --
> > To unsubscribe, e-mail:
> <ma...@jakarta.apache.org>
> > For additional commands, e-mail:
> <ma...@jakarta.apache.org>
> >
>
>
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>
>



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