Hi,
i did some adjustments to my code, in particular i declared a
stylefactory object within my ConstructStyle.java and in the constructor i
added it by doing:
this.lineStyle = styleFactory.createStyle();
to help create the style with the addition of doing declaring an instance
variable of this class called
private ConstructStyle constrStyle; in my ConstructMap.java and the
constructor as
this.constrStyle = new ConstructStyle();
but in doing so i get an exepction as follows:
ava.lang.NullPointerException
at
com.mycompany.Map_AppV2.ConstructStyle.<init>(ConstructSyle.java:87)
at com.mycompany.Map_AppV2.ConstructMap.<init>(ConstructMap.java:50)
at com.mycompany.Map_AppV2.MapApp.main(MapApp.java:42)
I looked on google about this particular exception to find out what it mean
and essentially it was about whether my variables were declared properly.
After doing some inspection, i noticed that these two variables do have the
keyword "this" so clearly i am missing something very small to do this. Here
is my code snippets:
ConstructStyle.java
class ConstructStyle implements StyleFactory, LineSymbolizer
{
// Create Style using StyleFactory
private Style lineStyle;
private StyleFactory styleFactory;
//private Graphics lineGraphics;
// StyleBuilder helps build simple styles
private StyleBuilder myStyleBuilder;
// Describe how to represent a feature on screen
private LineSymbolizer lineSymbolizer;
//
private FeatureTypeStyle fts;
private Rule firstRule;
ConstructStyle( )
{
this.lineStyle = styleFactory.createStyle(); // line 87
this.myStyleBuilder = new StyleBuilder();// Create StyleBuilder
object helps builds simple styles
//createStyle(file,myFeatureTypeSchema);
this.lineSymbolizer =
myStyleBuilder.createLineSymbolizer(Color.cyan); //create color to be
displayed
lineStyle = myStyleBuilder.createStyle(lineSymbolizer); // use
mystlyebuilder object to create a style and store this in variable
}
ConstructMap.java
class ConstructMap implements MapContext
{
private String Title = "Google App";
private String[] myFeatureTypeNames = null; // Create an array of string
to store the feature types
private String myFeatureTypeName = null; // store type name
private ConstructStyle constrStyle;
ConstructMap( ) throws Exception
{
this.constrStyle = new ConstructStyle(); // line 50
SwingFrame swingFr = new SwingFrame();
// Declare file instance
File file = new File("C:/Cavendish_map_data/map_01_data.shp");
// rest of code skipped
MapApp.java
public class MapApp {
public static void main(String[] args)
{
System.out.println("Geotools version is" + " " +
GeoTools.getVersion());
try {
// Class which builds the map
ConstructMap cMap = new ConstructMap();
ConstructStyle constrStyle = new ConstructStyle();
} catch (Exception ex) {
Logger.getLogger(MapApp.class.getName()).log(Level.SEVERE, null,
ex);
}
}
}
I've also uploaded my in case you would like to see.
Thanks
Michael Bedward wrote:
>
>> The problem i'm having is in my ConstructMap.java file where i am
>> adding
>> my featuressource and the style object to the mapcontext object as it
>> says:
>>
>> ava.lang.ClassCastException: com.mycompany.Map_AppV2.ConstructStyle
>> cannot
>> be cast to org.geotools.styling.Style
>> at
>> com.mycompany.Map_AppV2.ConstructMap.<init>(ConstructMap.java:81)
>> at com.mycompany.Map_AppV2.MapApp.main(MapApp.java:41)
>>
>
> If you can post a snippet of your code it would help
>
> Michael
>
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http://n2.nabble.com/file/n2229061/Map_AppV2.zip Map_AppV2.zip
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