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Posted to user@struts.apache.org by Dennis <de...@iswsolutions.com> on 2001/04/12 00:03:00 UTC

with indexed property problem

Hi,

I'm having trouble getting an html:select tag to properly set an indexed
bean property.  The tag I'm using looks like:

<html:select property="values[0]">

My Action form includes the following:

      protected String[]    mValues;

      public void setValues(int index, String value) {
        if (mValues == null) {
            mValues = new String[10];
        }
        mValues[index] = value;
	}

	public String getValues(int index) {
		return mValues[index];
	}

	public String[] getValues() {
		return mValues;
	}

	public void setValues(String[] vals) {
		mValues = vals;
	}

The attempt to set the values[0] property fails in the SelectTag
doStartTag() method with an InvocationTargetException, which results in the
following JspException:

Root cause:
javax.servlet.jsp.JspException: Getter for property values[0] threw
exception: java.lang.NullPointerException:
	at org.apache.struts.taglib.html.SelectTag.doStartTag(SelectTag.java:301)


I've successfully used the same form, and set the indexed properties using
<html:hidden>, but cannot get the html:select to work.  Any thoughts?

Thanks,

Dennis

RE: with indexed property problem

Posted by Dennis <de...@iswsolutions.com>.
I found my problem - sorry for the bother.  I had an unitialized array in
there that was getting returned to the SelectTag.  Thanks anyway..

Dennis

-----Original Message-----
From: Dennis [mailto:dennis@iswsolutions.com]
Sent: Wednesday, April 11, 2001 4:03 PM
To: struts-user@jakarta.apache.org
Subject: <html:select> with indexed property problem


Hi,

I'm having trouble getting an html:select tag to properly set an indexed
bean property.  The tag I'm using looks like:

<html:select property="values[0]">

My Action form includes the following:

      protected String[]    mValues;

      public void setValues(int index, String value) {
        if (mValues == null) {
            mValues = new String[10];
        }
        mValues[index] = value;
	}

	public String getValues(int index) {
		return mValues[index];
	}

	public String[] getValues() {
		return mValues;
	}

	public void setValues(String[] vals) {
		mValues = vals;
	}

The attempt to set the values[0] property fails in the SelectTag
doStartTag() method with an InvocationTargetException, which results in the
following JspException:

Root cause:
javax.servlet.jsp.JspException: Getter for property values[0] threw
exception: java.lang.NullPointerException:
	at org.apache.struts.taglib.html.SelectTag.doStartTag(SelectTag.java:301)


I've successfully used the same form, and set the indexed properties using
<html:hidden>, but cannot get the html:select to work.  Any thoughts?

Thanks,

Dennis