Cannot obtain an appropriate JDBC type for class char.

The above error while deploying...The full error is below. The only datatypes used are: integer, timestamp,string, decimal and date (so no char). Can anybody help?
Caught exception during application deployment from SAP J2EE Engine's deploy service:
java.rmi.RemoteException: Cannot deploy application sap.com/SAPAS12013.. Reason: Cannot obtain an appropriate JDBC type for class char. To store the field with this class in the database, the class must implement java.io.Serializable.; nested exception is: com.sap.engine.services.deploy.container.DeploymentException: <--Localization failed: ResourceBundle='com.sap.engine.services.deploy.DeployResourceBundle', ID='com.sap.engine.services.ejb.exceptions.deployment.EJBDeploymentException: Cannot obtain an appropriate JDBC type for class char. To store the field with this class in the database, the class must implement java.io.Serializable.
at com.sap.engine.services.ejb.deploy.tools.sql.Mappings.getDefaultSqlTypeForJavaType(Mappings.java:131)
at com.sap.engine.services.ejb.deploy.xml.CMPParser.fillCmpFieldInfo(CMPParser.java:89)
at com.sap.engine.services.ejb.deploy.xml.CMPParser.parseCMPFields(CMPParser.java:644)
at com.sap.engine.services.ejb.deploy.xml.CMPParser.parseFields(CMPParser.java:121)
at com.sap.engine.services.ejb.deploy.xml.EJBJarParser.parseXml(EJBJarParser.java:173)
at com.sap.engine.services.ejb.deploy.xml.EJBJarParser.parseXml(EJBJarParser.java:97)
at com.sap.engine.services.ejb.deploy.DeployAdmin.parseSingleJar(DeployAdmin.java:296)
at com.sap.engine.services.ejb.deploy.DeployAdmin.generate(DeployAdmin.java:246)
at com.sap.engine.services.ejb.EJBAdmin.deploy(EJBAdmin.java:2118)
at com.sap.engine.services.deploy.server.application.DeploymentTransaction.makeComponents(DeploymentTransaction.java:594)
at com.sap.engine.services.deploy.server.application.DeployUtilTransaction.commonBegin(DeployUtilTransaction.java:379)
at com.sap.engine.services.deploy.server.application.DeploymentTransaction.begin(DeploymentTransaction.java:296)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhasesOnOneServer(ApplicationTransaction.java:290)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhases(ApplicationTransaction.java:323)
at com.sap.engine.services.deploy.server.DeployServiceImpl.makeGlobalTransaction(DeployServiceImpl.java:3033)
at com.sap.engine.services.deploy.server.DeployServiceImpl.deploy(DeployServiceImpl.java:463)
at com.sap.engine.services.deploy.server.DeployServiceImplp4_Skel.dispatch(DeployServiceImplp4_Skel.java:1555)
at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:294)
at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:183)
at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:119)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)

Hi Ashley,
And yet, apparently you have a cmp-field with type <b>char</b> in one of your CMP entity beans. This is not supported. Please refer to the <a href="http://help.sap.com/saphelp_nw04/helpdata/en/13/dbb2b66146934a9662918755038ea1/frameset.htm">Object/Relational Mapping Rules</a> and especially to the first bullet under the table.
Hope that helps!
Vladimir

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Class name cannot be resolved to a type

Dear All,
I have one main class calling another class but I keep getting this error "
SMSClient cannot be resolved to a type". Before this I tried on other pc it was ok. Below is part of the codes. What could have been wrong? Can it be a missing library but how to trace that?
public class callSMSClient{   public static void main(String[] args) {
          SMSClient t1 = new SMSClient(0);
          t1.sendMessage("+6065544223","testing one two"); }}public class callSMSClient
          public static void main(String[] args)
     SMSClient t1 = new SMSClient(0);
     t1.sendMessage("+6065544223","testing one two");
public class SMSClient implements Runnable{
public final static int SYNCHRONOUS=0;
public final static int ASYNCHRONOUS=1;
private Thread myThread=null;
private int mode=-1;
private String recipient=null;
private String message=null;
public int status=-1;
public long messageNo=-1;
public SMSClient(int mode) {
this.mode=mode;
public int sendMessage (String recipient, String message)
      this.recipient=recipient;
      this.message=message;
      myThread = new Thread(this);
      myThread.start();
      //    run();
      return status;
public void run()
Sender aSender = new Sender(recipient,message);
try{
//send message
aSender.send ();
// System.out.println("sending ... ");
//in SYNCHRONOUS mode wait for return : 0 for OK, -2 for timeout, -1 for other errors
if (mode==SYNCHRONOUS)
while (aSender.status == -1)
{            myThread.sleep (1000);
if (aSender.status == 0)
messageNo=aSender.messageNo ;
catch (Exception e)
{         e.printStackTrace();
this.status=aSender.status ;
aSender=null;
}public class SMSClient implements Runnable{
public final static int SYNCHRONOUS=0;
public final static int ASYNCHRONOUS=1;
private Thread myThread=null;
private int mode=-1;
private String recipient=null;
private String message=null;
public int status=-1;
public long messageNo=-1;
public SMSClient(int mode) {
      this.mode=mode;
public int sendMessage (String recipient, String message){
    this.recipient=recipient;
    this.message=message;
    //System.out.println("recipient: " + recipient + " message: " + message);
    myThread = new Thread(this);
    myThread.start();
//    run();
    return status;
    public void run(){
    Sender aSender = new Sender(recipient,message);
    try{
      //send message
          aSender.send ();
         // System.out.println("sending ... ");
      //in SYNCHRONOUS mode wait for return : 0 for OK, -2 for timeout, -1 for other errors
      if (mode==SYNCHRONOUS) {
          while (aSender.status == -1){
            myThread.sleep (1000);
      if (aSender.status == 0)
         messageNo=aSender.messageNo ;
    }catch (Exception e){
        e.printStackTrace();
    this.status=aSender.status ;
    aSender=null;
}

Dear Ejp,
I would like to first share a simple case here first. Below is the simplied codes. Here I dont need any import statement. I keep both this in the same directory. I am using this command to compile javac callSMSClient.java. Why even this simple case is not working?
public class callSMSClient{
public static void main(String[] args)
     SMSClient t1 = new SMSClient(1);
     t1.sendMessage("+6014466044","testing one two");
public class SMSClient {
private int mode=-1;
private String recipient=null;
private String message=null;
public SMSClient(int mode) {
      this.mode=mode;
public void sendMessage (String recipient, String message){
    this.recipient=recipient;
    this.message=message;
    System.out.println("recipient: " + recipient + " message: " + message);
}

Exception "not implemented for class oracle.jdbc.driver.T4CNumberAccessor"

Hello I'm having some troubles dealing with 'java.sql.Date' I'm working with express edition database and I have three classes(different packages)
1.Mapper
2.Objects Class
3.ConsoleTest
I need to get an arraylist of objects, some of which contain dates, but when try to do it I get this exception
"java.sql.SQLException: Invalid column type: getDate not implemented for class oracle.jdbc.driver.T4CNumberAccessor"
Do you have any idea how I can implement the getDate method for this T4CNumberAccessor
Here are the methods that I'm using
1.Mapper
public ArrayList<Object> getAllTaskAuctions(Connection con)
          ArrayList<Object> l1 = new ArrayList<Object>();
          String SQLString1 = "select * from taskauction natural join tasks";
PreparedStatement statement=null;
try
//=== get taskauctions natural join tasks
statement = con.prepareStatement(SQLString1);
ResultSet rs = statement.executeQuery();
while(rs.next())
l1.add(new TaskAuction(rs.getInt(1), rs.getInt(2), rs.getInt(3),
rs.getDate(4), rs.getDate(5), rs.getInt(6)));
l1.add(new Task(rs.getInt(1), rs.getInt(2), rs.getString(3),
rs.getString(4), rs.getString(5), rs.getString(6), rs.getInt(7)));
catch (Exception exc)
System.out.println("Fail in TaskAuctionMapper - getAllTaskAuctions");
System.out.println(exc);
return l1;
2.ConsoleTest class
Connection con;
     public Connection getConnection(){
          try{
     Class.forName("oracle.jdbc.driver.OracleDriver");
     con = DriverManager.getConnection(
     "jdbc:oracle:thin:@localhost:1521:XE", "Project", "123" );
     //username/password@[/]host[:port][service_name]
     catch (Exception e)
     {   System.out.println("fail in getConnection()");
     System.out.println(e); }
          return con;
     public static void main(String[] args) {
          ConsoleTest ct = new ConsoleTest();
          TaskAuctionMapper tam1 = new TaskAuctionMapper();
ArrayList<Object> alt1 = tam1.getAllTaskAuctions(ct.getConnection());
Iterator<Object> itr1 = alt1.iterator();
while (itr1.hasNext())
TaskAuction taskauct = (TaskAuction) itr1.next();
//Problem, exception traced to TaskAuctionMapper
System.out.println(
          "Task ID: " + taskauct.getTaskid()+ ", "+
          "StartDate: "+ taskauct.getStartdate()+", "+
          "User ID: " + taskauct.getUserid());
     }

Found the answer, I shouldn't use integers as parameters of column index in the result set, but instead use String to mark the fields :)

Can't use classes in own package ... cannot be resolved into a type

I am fairly new to java and I am having the following problem.
i have a folder structure that goes as follows:
cs/uwm/client/io
and in this directory I have 3 files: ConsoleReader.java ConsoleWriter.java and ConsoleManager.java
and at the top of all three I have the following:
package cs.uwm.client.io;
ConsoleReader and ConsoleWriter are compiling fine
However in ConsoleManager I am using these classes ConsoleReader/Writer and It compile fine for me on a windows JDK in cywin, but when I try this on a Fedore6 system with an Eclipe Java Compiler v_686_R32x, 3.2.2 release I have the following error:
ConsoleWriter cannot be resolved into a type
when I try the following line: ConsoleReader reader = new ConsoleReader( System.in );
I tried importing cs.uwm.client.io but that didnt' work. I couldn't find anything on the forums here if you are trying to use a class defined in your package inside your package the way I am.
Any help would be great!

So it compiles from a commandline invocation of Java, but not from within Eclipse?
Sounds like you need to ask the question at an Eclipse site, since the problem is not a Java problem - and this forum is for Java language questions, not IDE support questions.
Probably caused by the fact that Eclipse doesn't use Sun's Java compiler.

Cannot obtain an appropriate JDBC type for class char.

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