Hi,
im still trying to get familiar with SmartGwt. I made a simple login page, and DMI on the background to handle user authentication and session. It runs under hosted mode, everything is fine just a bit slow, so i wrapped up the project in a WAR file, and wanted to see how it performs on Tomcat. But when i click on a button to call a DMI method ‘tryLogin’, it returns an error:
org.apache.commons.collections.map.LinkedMap cannot be cast to java.lang.String
From the server logs, i saw this:
=== 2010-10-07 11:06:25,932 [88-4] DEBUG RPCManager - Request #1 (DSRequest) payload: {
criteria:{
username:{
"0":"g",
"1":"e",
"2":"o",
"3":"r",
"4":"g",
"5":"e",
tI:2
},
password:{
"0":"a",
"1":"d",
"2":"m",
"3":"i",
"4":"n",
tI:2
}
},
operationConfig:{
dataSource:"userDmi",
operationType:"fetch"
},
appID:"builtinApplication",
operation:"tryLogin",
oldValues:{
username:{
"0":"g",
"1":"e",
"2":"o",
"3":"r",
"4":"g",
"5":"e",
tI:2
},
password:{
"0":"a",
"1":"d",
"2":"m",
"3":"i",
"4":"n",
tI:2
}
}
}
this is quite different from what i saw when running under hosted mode:
[java] === 2010-10-07 08:14:23,504 [l0-5] DEBUG RPCManager - Request #1 (DSRequest) payload: {
[java] criteria:{
[java] username:"george",
[java] password:"admin"
[java] },
[java] operationConfig:{
[java] dataSource:"userDmi",
[java] operationType:"fetch"
[java] },
[java] appID:"builtinApplication",
[java] operation:"tryLogin",
[java] oldValues:{
[java] username:"george",
[java] password:"admin"
[java] }
[java] }
the parameters in Tomcat are converted to byte arrays some how, but they are Strings in hosted mode. Here’s how i set the criteria on the client side:
DSRequest request = new DSRequest();
request.setOperationId("tryLogin");
Criteria cri = new Criteria();
String username = textItemUsername.getValue().toString();
String password = passwordItemPassword.getValue().toString();
cri.addCriteria("username", username);
cri.addCriteria("password", password);
SC.showPrompt("Please wait...");
Datasource datasource = DataSource.get("userDmi");
datasource.fetchData(cri, new DSCallback() {
public void execute(DSResponse response, Object rawData, DSRequest request) {
if(response.getStatus() == DSResponse.STATUS_FAILURE) {
SC.clearPrompt();
} else {
GuiUtil.reload();
}
}
}, request);
the userDmi.ds.xml
...
<binding operationType="fetch" operationId="tryLogin" serverMethod="tryLogin">
<serverObject className="au.com.sample.server.TransUserDMI" lookupStyle="new"/>
</binding>
...
TransUserDMI.java
...
public DSResponse tryLogin(DSRequest request, HttpServletRequest req) throws Exception {
_log.info("Calling tryLogin");
Map<String, String> cri = request.getCriteria();
// String username = cri.get("username"); <=====
// String password = cri.get("password"); <=====
_log.info("---- " + request.getFieldValue("username") + ", " + request.getFieldValue("password"));
/*** the above line prints out: 07 Oct 11:06:25 INFO nsact.server.TransUserDMI..tryLogin :63 - ---- {0=g, 1=e, 2=o, 3=r, 4=g, 5=e, tI=2}, {0=a, 1=d, 2=m, 3=i, 4=n, tI=2} **/
String username = (String)request.getFieldValue("username"); <====
String password = (String)request.getFieldValue("password"); <====
if(username.equals("george") && password.equals("admin")) {
System.out.println("Username = " + username + ", Password = " + password);
req.getSession().setAttribute("loginUser", "george");
} else {
DSResponse res = new DSResponse("Login failed!", DSResponse.STATUS_FAILURE);
return res;
}
return request.execute();
}
...
the error was reported on the lines that i marked arrows.
Server Error message:
=== 2010-10-07 11:06:25,934 [88-4] DEBUG DataSourceDMI - Invocation threw exception
java.lang.ClassCastException: org.apache.commons.collections.map.LinkedMap cannot be cast to java.lang.String
at au.com.sample.server.TransUserDMI.tryLogin(TransUserDMI.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
......
Guys, please help, thank you!!!