[mapserver-users] java mapscript + postgis = jvm crashed

[Ludovico Bianchini]

Umberto Nicoletti ha scritto:
> I am using postgis layers (on Linux, though) and it works fine.
>
> Do you share the same mapObj between threads (in application scope) or
> multiple requests (in session scope)?
> mapscript is safe only when a new mapObj is created for each request.
> What other kind of layers do you have in your map?
>
> Umberto
>
>
> On Mon, Sep 22, 2008 at 10:34 PM, Ludovico Bianchini <metlud at yahoo.it> wrote:
>   
>> - Windows Vista Home Premium
>> - Postgres 8.1
>> - jvm 1.6.0
>> - jboss 4.0.3SP1, tomcat 5.5
>> - struts2
>> - ms4w 2.2.3 (mapscript.jar, mapscript.dll, all other dlls taken from this pack)
>> - postgresql-8.2-505.jdbc4.jar
>>
>> mapscript.jar is placed in C:\jboss-4.0.3SP1\server\default\deploy\jbossweb-tomcat55.sar
>>
>> When a layer with a postgis connection is turned on, the draw method crashes the jvm.
>>
>> Error file attached.
>>
>> Is there any solution to this problem?
>>
>> Postgis is listed in "unsafe components", i have not understood if there is one way to make it work using thread syncronization.
>>
>> Thanks in advance for any help.
>>
>> Ludovico
>>
>>
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>>     
>
>
>   
I think I do not share the same object between request.

The other layer are shape file layer, they work fine (zoom ok, pan ok).

<struts><!-- Configuration for the default package. -->
    <package name="default" extends="struts-default">
         .
     .
     .
        <action name="Mappa*" class="segnaletica.action.MappaAction" 
method="{1}">
            <result>/jsp/mappa.jsp</result>
     .
     .
     .
        </action>
    </package>
</struts>

public class MappaAction extends ActionSupport implements
ServletRequestAware{
    .
    .//attributes
    .
    .
public String execute() throws Exception {
       
        mapObj mapObj_o = new 
mapObj("C:\\jboss-4.0.3sp1_map\\map\\treviso.map");//create a new mapObj 
object
       
        if(OP == null) OP = "-1";
       
        int op = Integer.parseInt(OP);
        switch (op) {
        case Z_IN: zoomIn(mapObj_o);
           
            break;
        case Z_OUT: zoomOut(mapObj_o);
           
            break;
        case PAN: pan(mapObj_o);
   
            break;
        case REFRESH: refresh(mapObj_o);
   
            break;

        default: fullExtent(mapObj_o);
            break;
        }
        return SUCCESS;
    }
    .
    .//utility methods, map navigation methods
    .

private void draw(mapObj mapObj_o){
        .
        .
        mapImageObj = mapObj_o.draw();//this instruction crashes the JVM
        .
        .
    }

}

########################################################
####                            LAYER SEGNALETICA                        
    ####
########################################################
 
    LAYER
        NAME "segnaletica"
        STATUS OFF
        TYPE POINT
        TRANSFORM false
        POSTLABELCACHE true
        CONNECTION "user=user password=password dbname=dbname 
host=localhost port=5432"
        CONNECTIONTYPE postgis
        DATA "posizionegeoref from rilievi.impianti" 
        CLASS
            STYLE
                COLOR 255 99 0
                SYMBOL "circle"
                SIZE 12
            END
        END
        PROJECTION
            "init=epsg:4326"
        END
    END

Ludovico
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