[ERROR] Line 3: The import java.math cannot be resolved

[akshi]

Hi Folks,

I am using GWT as a beginner and at the time of using
java.math.BigDecimal it gives me exception.

Compiling module com.techjini.app.SwordFish
Refreshing module from source
Validating newly compiled units
Removing units with errors
[ERROR] Errors in 'file:/D:/dev/GWT/gwt_workspace/
SwordFish/src/com/techjini/app/client/InvoiceService.java'
[ERROR] Line 3: The import java.math cannot be resolved
[ERROR] Line 13: BigDecimal cannot be resolved to a
type
Removing units with errors
[ERROR] Errors in 'file:/D:/dev/GWT/gwt_workspace/
SwordFish/src/com/techjini/app/client/invoice/CreateInvoice.java'
[ERROR] Line 341: No source code is available for type
java.math.BigDecimal; did you forget to inherit a required module?
[ERROR] Errors in 'file:/D:/dev/GWT/gwt_workspace/
SwordFish/src/com/techjini/app/client/InvoiceServiceAsync.java'
[ERROR] Line 10: No source code is available for type
java.math.BigDecimal; did you forget to inherit a required module?
Removing invalidated units
[WARN] Compilation unit 'file:/D:/dev/GWT/gwt_workspace/
SwordFish/src/com/techjini/app/client/invoice/InvoiceScreen.java' is
removed due to invalid reference(s):
[WARN] file:/D:/dev/GWT/gwt_workspace/SwordFish/src/com/
techjini/app/client/invoice/CreateInvoice.java
[WARN] Compilation unit 'file:/D:/dev/GWT/gwt_workspace/
SwordFish/src/com/techjini/app/client/SwordFish.java' is removed due
to invalid reference(s):
[WARN] file:/D:/dev/GWT/gwt_workspace/SwordFish/src/com/
techjini/app/client/invoice/InvoiceScreen.java
Computing all possible rebind results for
'com.techjini.app.client.SwordFish'
Rebinding com.techjini.app.client.SwordFish
Checking rule <generate-with
class='com.google.gwt.user.rebind.ui.ImageBundleGenerator'/>
[ERROR] Unable to find type
'com.techjini.app.client.SwordFish'
[ERROR] Hint: Previous compiler errors may have made
this type unavailable
[ERROR] Hint: Check the inheritance chain from your
module; it may not be inheriting a required module or a module may not
be adding its source path entries properly


Following is the code :

Model class :
import java.math.BigDecimal;
import java.util.Date;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.datastore.Blob;
import com.techjini.app.server.util.DateUtil;

@PersistenceCapable(identityType=IdentityType.APPLICATION)
public class Invoice {

public static final Short ACTIVE_STATUS = 1;
public static final Short INACTIVE_STATUS = 2;


@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long invoiceId;
@Persistent
private ClientCustomer clientCustomer;
@Persistent
private InvoiceTemplate invoiceTemplate;
@Persistent
private InvoiceSetting invoiceSetting;
@Persistent
private Date dueDate;
@Persistent
private Date invoiceDate;
@Persistent
private BigDecimal amount;
@Persistent
private Short InvoiceStatus;
@Persistent
private Blob invoiceContent;
@Persistent
private Date createdAt;
@Persistent
private Long createdBy;
@Persistent
private Date lastUpdatedAt;
@Persistent
private Long lastUpdatedBy;
@Persistent
private boolean isDeleted;
@Persistent
private Integer version;

public Invoice(Long clientCustomerId, Date dueDate,
Date invoiceDate, BigDecimal amount, Short invoiceStatus) {
this.amount = amount;
this.createdAt = DateUtil.getCurrentDate();
this.dueDate = dueDate;
this.invoiceDate = invoiceDate;
this.lastUpdatedAt = DateUtil.getCurrentDate();
this.InvoiceStatus = invoiceStatus;
}
// and getter setter of the fields
}


Interface :

import java.math.BigDecimal;
import java.util.Date;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;


@RemoteServiceRelativePath("createInvoice")
public interface InvoiceService extends RemoteService {
String createInvoice(String invoiceNo, Long clientCustomerId, Date
dueDate, Date invoiceDate, BigDecimal amount ) throws Throwable;
}


import java.math.BigDecimal;
import java.util.Date;

import com.google.gwt.user.client.rpc.AsyncCallback;


public interface InvoiceServiceAsync {
String createInvoice(String invoiceNo, Long clientCustomerId, Date
dueDate, Date invoiceDate, BigDecimal amount, AsyncCallback<String>
callback);
}


Action

import java.math.BigDecimal;
import java.util.Date;

import javax.jdo.PersistenceManager;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import com.techjini.app.client.InvoiceService;
import com.techjini.app.persistance.PMF;
import com.techjini.app.server.pojo.Invoice;


public class CreateInvoiceAction extends RemoteServiceServlet
implements InvoiceService {

//private static transient Log LOG = LogFactory.getLog
(CreateInvoiceAction.class);
Invoice invoice;

@Override
public String createInvoice(String invoiceNo, Long clientCustomerId,
Date dueDate, Date invoiceDate, BigDecimal amount) throws Throwable {

PersistenceManager pm = PMF.get().getPersistenceManager();

invoice = new Invoice(clientCustomerId, dueDate, invoiceDate,
amount, Invoice.ACTIVE_STATUS);


try {
pm.makePersistent(invoice);
} catch (Exception ex) {
ex.printStackTrace();

throw new Throwable( "Sorry due to " + ex + " invoice could
not created" );
}
finally {
pm.close();
}
return "Successfully created invoice";
}

}


Client side code

public class CreateInvoice {

//private static transient Log LOG = LogFactory.getLog
(CreateInvoice.class);
/**
* Create a remote service proxy to talk to the server-side Invoice
service.
*/
private final InvoiceServiceAsync invoiceService = GWT
.create(InvoiceService.class);
.........................
.......................
private void sendInvoiceDetailToServer() {

//Invoice invoice = new Invoice();
//invoice.setInvoiceStatus(invoice.ACTIVE_STATUS);
invoiceService.createInvoice(invoiceNo.getText(), new Long
(customerList.getSelectedIndex()), dueDate.getValue(),
invoiceDate.getValue()
, new BigDecimal(amount.getText()), new AsyncCallback<String>() {
public void onFailure(Throwable caught) {
// Show the RPC error message to the user
try {
System.out.println("Remote Procedure Call - Failure");
} catch (Exception e) {
System.out.println(e.getMessage());
}
}

@Override
public void onSuccess(String result) {
System.out.println("Remote Procedure Call");
System.out.println("Remote");
}
});
}

......................

}

Can you please help me if I have to add anything to the module gwt.xml
class.

Looking forward for help!

Thanks in advance.

Akshi

[Jason Essington]

BigDecimal is not emulated in GWT and thus cannot be compiled to
javascript.

Have a look at what is available to you:
http://code.google.com/webtoolkit/doc/1.6/RefJreEmulation.html

-jason

[Ken Kahn]

I once needed BigInteger in GWT and took the source code for the
BigInteger class and with minor editing it worked fine in GWT. Perhaps
this would work with BigDecimal as well.

Maybe someone on this list will know if there are any legal issues
with doing this?

-ken