Class Cast Exception and I can't figure it out

[da_rod_father]

I am getting an exception at runtime when I try to cast a class of type
that i created to an ArrayList:

<% ArrayList secs = help.getList();
if (secs != null && secs.size() >0) {
for ( int i = 0; i < secs.size(); i++) {
PropertyFileSectionData secName = (PropertyFileSectionData)
secs.get(i);
%>

It crashes everytime I try to render this line in a jsp:

<label><%=secName.getSectionName() %></label></td>

I get a java.lang.ClassCastException: java.lang.String and it complains
that java.lang.String it is not comparable to my class I created(
PropertyFileSectionData ). Could anyone point me in the right
direction to debug this?

thx

 

[Ian Mills]

I am getting an exception at runtime when I try to cast a class of type
that i created to an ArrayList:

<% ArrayList secs = help.getList();
if (secs != null && secs.size() >0) {
for ( int i = 0; i < secs.size(); i++) {
PropertyFileSectionData secName = (PropertyFileSectionData)
secs.get(i);
%>

It crashes everytime I try to render this line in a jsp:

<label><%=secName.getSectionName() %></label></td>

I get a java.lang.ClassCastException: java.lang.String and it complains
that java.lang.String it is not comparable to my class I created(
PropertyFileSectionData ). Could anyone point me in the right
direction to debug this?

thx

Please provide the source for PropertyFileSectionData, although it would
suggest that the getSectionName method is not returning a String.

 

[da_rod_father]

I created an interface with abstract methods.

public interface PropertyFileSectionData
{
public abstract String getSectionName();
public abstract void setSectionName(String sectionName);

public abstract String getSectionComment();
public abstract void setSectionComment(String sectionComment);

public abstract PropertyFilePropAndValuePairsData
getPropertyAndValuePairs();
public abstract void
setPropertyAndValuePairs(PropertyFilePropAndValuePairsData
propAndVauePairs);

}

I also create an implementation class to actually do the work.

public class PropertyFileSectionDataImpl implements
PropertyFileSectionData
{
protected String _sectionName;
protected String _sectionComment;
protected SPPropertyFilePropAndValuePairsData _propAndValuePairs;

public PropertyFilePropAndValuePairsData
getPropertyAndValuePairs() {
return _propAndValuePairs;
}
public void
setPropertyAndValuePairs(PropertyFilePropAndValuePairsData
andValuePairs) {
_propAndValuePairs = andValuePairs;
}
public String getSectionComment() {
return _sectionComment;
}
public void setSectionComment(String comment) {
_sectionComment = comment;
}
public String getSectionName() {
return _sectionName;
}
public void setSectionName(String name) {
_sectionName = name;
}
}

 

[da_rod_father]

I am wondering if I am modeling this wrong? Are there any good
examples on how to correctly implement interfaces?