java - Android application connecting to an as400 database -

i'm trying android connected as400 server. unfortunately when click on connexion button, driver isn't loaded , don't know why.

here code:

package hello.world;  import java.sql.connection; import java.sql.drivermanager; import java.sql.sqlexception;  import android.app.activity; import android.os.bundle; import android.view.view;   public class helloworldactivity extends activity {     /** called when activity first created. */       @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);     }       public void connexion(view view) throws sqlexception {         system.out.println("tentative de connexion à la base de donnée."); //connexion          string driver = "com.ibm.as400.access.as400jdbcdriver";          string url = "jdbc:as400://beaufix;transaction isolation=read uncommitted;date format=iso;naming=system;libraries=*libl";            connection conn = null;         string username = "gmaobd60";         string password = "gmaobd60";          try {           class.forname(driver).newinstance();           conn = drivermanager.getconnection(url,username,password);           system.out.println("connected database");            conn.close();           system.out.println("disconnected database");         } catch (exception e) {           e.printstacktrace();           system.out.println("error");  } } } 

here xmd code:

<button android:id="@+id/connexion" android:layout_width="196dp" android:layout_height="wrap_content" android:layout_marginleft="50dp" android:layout_margintop="100dp" android:text="@string/connexion" android:layertype="hardware" android:onclick="connexion" />

and here error log:

06-05 07:18:56.100: w/system.err(564): java.lang.classnotfoundexception: com.ibm.as400.access.as400jdbcdriver 06-05 07:18:56.155: w/system.err(564):  @ java.lang.class.classforname(native method) 06-05 07:18:56.180: w/system.err(564):  @ java.lang.class.forname(class.java:217) 06-05 07:18:56.212: w/system.err(564):  @ java.lang.class.forname(class.java:172) 06-05 07:18:56.241: w/system.err(564):  @ hello.world.helloworldactivity.connexion(helloworldactivity.java:33) 06-05 07:18:56.271: w/system.err(564):  @ java.lang.reflect.method.invokenative(native method) 06-05 07:18:56.290: w/system.err(564):  @ java.lang.reflect.method.invoke(method.java:511) 06-05 07:18:56.321: w/system.err(564):  @ android.view.view$1.onclick(view.java:3039) 06-05 07:18:56.340: w/system.err(564):  @ android.view.view.performclick(view.java:3511) 06-05 07:18:56.371: w/system.err(564):  @ android.view.view$performclick.run(view.java:14105) 06-05 07:18:56.371: w/system.err(564):  @ android.os.handler.handlecallback(handler.java:605) 06-05 07:18:56.380: w/system.err(564):  @ android.os.handler.dispatchmessage(handler.java:92) 06-05 07:18:56.391: w/system.err(564):  @ android.os.looper.loop(looper.java:137) 06-05 07:18:56.391: w/system.err(564):  @ android.app.activitythread.main(activitythread.java:4424) 06-05 07:18:56.401: w/system.err(564):  @ java.lang.reflect.method.invokenative(native method) 06-05 07:18:56.410: w/system.err(564):  @ java.lang.reflect.method.invoke(method.java:511) 06-05 07:18:56.421: w/system.err(564):  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:784) 06-05 07:18:56.431: w/system.err(564):  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:551) 06-05 07:18:56.431: w/system.err(564):  @ dalvik.system.nativestart.main(native method) 06-05 07:18:56.441: w/system.err(564): caused by: java.lang.noclassdeffounderror: com/ibm/as400/access/as400jdbcdriver 06-05 07:18:56.460: w/system.err(564):  ... 18 more 06-05 07:18:56.460: w/system.err(564): caused by: java.lang.classnotfoundexception: com.ibm.as400.access.as400jdbcdriver 06-05 07:18:56.481: w/system.err(564):  @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:61) 06-05 07:18:56.492: w/system.err(564):  @ java.lang.classloader.loadclass(classloader.java:501) 06-05 07:18:56.492: w/system.err(564):  @ java.lang.classloader.loadclass(classloader.java:461) 06-05 07:18:56.500: w/system.err(564):  ... 18 more 

also i've tried many things came error. me please want work :(

and no didn't forget import jt400.jar "com.ibm.as400.access.as400jdbcdriver"

thank in advance, aurelian

i haven't tried ibm toolbox java (jt400.jar) may not compatible dalvik jvm. dalvik not 100% compatible implementation of java vm.

are sure want weight , security implications of library toolbox distributed on mobile device? recommend server (as/400) application provide services mobile clients while managing security, caching, etc.

a framework grails can deployed natively on as/400 makes server application breeze. , dealing xml or json services on http make mobile application easier, more robust, , heck of lot easier maintain.

i have similar application in production supporting on hundred windows ce/mobile clients (motorola/symbol handhelds). i'm looking forward porting client android once hardware available.