<DIV>Hi Oliver,</DIV>
<DIV>I have just done what you recomended, leaving the JavaMapscript-Class so the only thing he does is to load the library.</DIV>
<DIV>Then in another class, the one where I have my servlet, I wote in the: public void init (ServletConfig cfg){</DIV>
<DIV> </DIV>
<DIV>JavaMapscript.getInstance();</DIV>
<DIV> </DIV>
<DIV>and later in the:</DIV>
<DIV>public void service (HttpServletRequest req, HttpServletResponse res){</DIV>
<DIV> </DIV>
<DIV>I began writing my mapscript code, and it still gives me the same error:</DIV>
<DIV> </DIV>
<DIV>javax.servlet.ServletException: Native Library /opt/SUNappserver/domains/domain1/lib/ext/libmapscript.so already loaded in another classloader</DIV>
<DIV> </DIV>
<DIV>Do you know why?</DIV>
<DIV> </DIV>
<DIV>Thank you</DIV>
<DIV> </DIV>
<DIV>Jose Luis<BR><BR><B><I>Oliver Wesp <wesp@gdv.com></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Hi,<BR><BR>you're on the right way to avoid the "Native library cannot be loaded <BR>twice" error. Your JavaMapscript-Class implements a singleton so it's <BR>loaded only once in Tomcat. But you should not add your mapscript code <BR>to this class. Whenever you change the class Tomcat tries to reload and <BR>complains about the library already loaded.<BR>Write a second class and load the library with<BR><BR>JavaMapscript.getInstance();<BR><BR>Add your mapscript code to that class and you should be fine.<BR><BR>best regards<BR>Oliver<BR><BR>Jose Luis Gonzalez wrote:<BR>> Hi to all<BR>> I would implement mapserver in tomcat as servlet but I have found a lot of<BR>> problems in start with it!<BR>> <BR>> So:<BR>> 1) is there sites that implement mapserver as servlet in tomcat that I can<BR>> view?<BR>> 2) Some one have a piece of basic code that I can compile as
servlet in<BR>> tomcat for view how it run? I have load the java Howto.<BR>> <BR>> Do you have examples so I can see how can I work<BR>> with mapserver functions and servlets?<BR>> I have been seeing the wiki, but I can not really find what I want.<BR>> <BR>> I have done the example of loading a library that apears in:<BR>> <BR>> http://www.unicolet.org/mapserver/tomcat.html <BR>> <HTTPS: go.php?url="http%3A%2F%2Fwww.unicolet.org%2Fmapserver%2Ftomcat.html&Horde=324c42e307e8eddcfaf3545b63ecab4e" util horde webmail.upv.es><BR>> <BR>> and it works, but when I want to complete the JavaMapscript.java code <BR>> with other<BR>> mapserver comands, it doesn't work:<BR>> <BR>> import edu.umn.gis.mapscript.*;<BR>> <BR>> public class JavaMapscript {<BR>> private static JavaMapscript instance=null;<BR>> <BR>> private JavaMapscript() {<BR>> try {<BR>> System.loadLibrary("mapscript");<BR>> } catch (Exception e) {<BR>>
e.printStackTrace();<BR>> System.err.println("* error loading native library *");<BR>> System.err.println("Error is: "+e);<BR>> }<BR>> System.out.println(" * mapscript native library loaded *");<BR>> mapObj map = new mapObj("test.map");<BR>> imageObj img = map.draw();<BR>> //img.save("result", map);*/<BR>> }<BR>> <BR>> public static JavaMapscript getInstance() {<BR>> System.out.println("Try to instantiate Mapscript");<BR>> System.out.flush();<BR>> if ( instance == null ) {<BR>> instance = new JavaMapscript();<BR>> }<BR>> return instance;<BR>> }<BR>> }<BR>> <BR>> And even worse, when I do any modifications and I put the new .class <BR>> file in the<BR>> server, I have an error because it says that the library was already <BR>> loaded, and<BR>> my only solution now to solve it is to turn off the server and turn it <BR>> on again.<BR>> <BR>> Hope someone can help me<BR>> <BR>> Thank you<BR>>
<BR>> Jose Luis<BR>> <BR>> ------------------------------------------------------------------------<BR>> <BR>> Nuevo Correo Yahoo! <BR>> <HTTP: es.mail.yahoo.com *http: image mail tagline mail_es es.rd.yahoo.com><BR>> <BR><BR><BR>-- <BR>Dipl.-Geogr. Oliver Wesp<BR>Gesellschaft fuer geografische Datenverarbeitung<BR>Binger Strasse 49-51<BR>D-55218 Ingelheim<BR>fon: +49 6132 714818<BR>fax: +49 6132 714828<BR>http: www.gdv.com<BR></BLOCKQUOTE><p>
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