Custom exception problems with ADF framework

Question

Hi,
I have problems with the exception handling in an web service Java class (POJO).
In this class I throw my own exception WsException-class which extends the normal Exception-class.
The class WebservicesAppModule extends the oracle.jbo.ApplicationModule.
In the following I first describe the web service class and then the three tests a)-c).
In test b) you can find my main problem.
Web service Java class (POJO):
public Element check(Element element) throws WsException{   
WebservicesAppModule am = null;
try {
// 1) system error
// if I comment the next line out, then am = null and a NullPointerException is thrown which appear as NullPointerException in the SOAP response
am = (WebservicesAppModule)Configuration.createRootApplicationModule(_am,_cf);
if(value == null){
// 2) application error
WsException wsex = new WsException();
wsex.addErrorCode(WsException.C_INVALID_BANK_CONNECTION);
throw wsex;
} else if (value2 == null){
// 3) explicit system error
throw new NullPointerException();
}catch(WsException wsex){
// 4) application error
throw wsex;
}catch(Throwable ex){
// 5) system error
log.debug("Technischer Fehler", ex);
WsException wsex = new WsException("system error");
wsex.addErrorCode(WsException.C_NOK);
throw wsex;
} finally {
if (_am != null) {
Configuration.releaseRootApplicationModule(am, false);
Test a):
- The WebservicesAppModule is initialized (1)
- value = null, so the process run in the "application error" if-block (2)
- The WsException is thrown and catched in the "application error" catch-block (4)
The SOAP repsonse is okay:
--- Response ---
HTTP/1.1 100 Continue
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Date: Thu, 20 Jul 2006 09:43:39 GMT
HTTP/1.1 500 Internal Server Error
Date: Thu, 20 Jul 2006 09:43:55 GMT
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Content-Length: 520
Connection: Close
Content-Type: text/xml; charset=utf-8
<?xml version = '1.0' encoding = 'UTF-8'?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring>[11000, 10001] [de.test.webservices.WsException]</faultstring>
<faultactor>/app-Webservices-context-root/WebServices</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Test b):
- The WebservicesAppModule is NOT initialized (the line is comment out) (1)
- The process run in system error catch-block (5)
In the SOAP repsonse I expected the following <faultstring> (like in test c) )
<faultstring>system error: [10000] [de.test.webservices.WsException]</faultstring>
and not
<faultstring> [java.lang.NullPointerException]</faultstring>
What´s the problem?
--- Response ---
HTTP/1.1 100 Continue
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Date: Thu, 20 Jul 2006 08:59:12 GMT
HTTP/1.1 500 Internal Server Error
Date: Thu, 20 Jul 2006 09:01:02 GMT
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Content-Length: 506
Connection: Close
Content-Type: text/xml; charset=utf-8
<?xml version = '1.0' encoding = 'UTF-8'?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring> [java.lang.NullPointerException]</faultstring>
<faultactor>/app-Webservices-context-root/WebServices</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Test c):
- The WebservicesAppModule is initialized (1)
- value != null, so the process run to the next if-block (2)
- value2 == null, so the process run in the "explicit system error" (3)
- The WsException is thrown and catched in the "system error" catch-block (5)
This test shows that not the NullPointerException of Test b) is the problem.
This response is expected in Test b).
--- Response ---
HTTP/1.1 100 Continue
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Date: Thu, 20 Jul 2006 13:53:46 GMT
HTTP/1.1 500 Internal Server Error
Date: Thu, 20 Jul 2006 13:54:19 GMT
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Content-Length: 533
Connection: Close
Content-Type: text/xml; charset=utf-8
<?xml version = '1.0' encoding = 'UTF-8'?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring>system error: [10000] [de.test.webservices.WsException]</faultstring>
<faultactor>/app-Webservices-context-root/WebServices</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
What is the cause for the false <faultstring> in test b)? Where set the the ADF framework the NullPointerException and how can I avoid that?
Thanks and best regards,
Tobias

Answer 1

Hi,
I have problems with the exception handling in an web service Java class (POJO).
In this class I throw my own exception WsException-class which extends the normal Exception-class.
The class WebservicesAppModule extends the oracle.jbo.ApplicationModule.
In the following I first describe the web service class and then the three tests a)-c).
In test b) you can find my main problem.
Web service Java class (POJO):
public Element check(Element element) throws WsException{   
WebservicesAppModule am = null;
try {
// 1) system error
// if I comment the next line out, then am = null and a NullPointerException is thrown which appear as NullPointerException in the SOAP response
am = (WebservicesAppModule)Configuration.createRootApplicationModule(_am,_cf);
if(value == null){
// 2) application error
WsException wsex = new WsException();
wsex.addErrorCode(WsException.C_INVALID_BANK_CONNECTION);
throw wsex;
} else if (value2 == null){
// 3) explicit system error
throw new NullPointerException();
}catch(WsException wsex){
// 4) application error
throw wsex;
}catch(Throwable ex){
// 5) system error
log.debug("Technischer Fehler", ex);
WsException wsex = new WsException("system error");
wsex.addErrorCode(WsException.C_NOK);
throw wsex;
} finally {
if (_am != null) {
Configuration.releaseRootApplicationModule(am, false);
Test a):
- The WebservicesAppModule is initialized (1)
- value = null, so the process run in the "application error" if-block (2)
- The WsException is thrown and catched in the "application error" catch-block (4)
The SOAP repsonse is okay:
--- Response ---
HTTP/1.1 100 Continue
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Date: Thu, 20 Jul 2006 09:43:39 GMT
HTTP/1.1 500 Internal Server Error
Date: Thu, 20 Jul 2006 09:43:55 GMT
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Content-Length: 520
Connection: Close
Content-Type: text/xml; charset=utf-8
<?xml version = '1.0' encoding = 'UTF-8'?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring>[11000, 10001] [de.test.webservices.WsException]</faultstring>
<faultactor>/app-Webservices-context-root/WebServices</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Test b):
- The WebservicesAppModule is NOT initialized (the line is comment out) (1)
- The process run in system error catch-block (5)
In the SOAP repsonse I expected the following <faultstring> (like in test c) )
<faultstring>system error: [10000] [de.test.webservices.WsException]</faultstring>
and not
<faultstring> [java.lang.NullPointerException]</faultstring>
What´s the problem?
--- Response ---
HTTP/1.1 100 Continue
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Date: Thu, 20 Jul 2006 08:59:12 GMT
HTTP/1.1 500 Internal Server Error
Date: Thu, 20 Jul 2006 09:01:02 GMT
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Content-Length: 506
Connection: Close
Content-Type: text/xml; charset=utf-8
<?xml version = '1.0' encoding = 'UTF-8'?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring> [java.lang.NullPointerException]</faultstring>
<faultactor>/app-Webservices-context-root/WebServices</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Test c):
- The WebservicesAppModule is initialized (1)
- value != null, so the process run to the next if-block (2)
- value2 == null, so the process run in the "explicit system error" (3)
- The WsException is thrown and catched in the "system error" catch-block (5)
This test shows that not the NullPointerException of Test b) is the problem.
This response is expected in Test b).
--- Response ---
HTTP/1.1 100 Continue
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Date: Thu, 20 Jul 2006 13:53:46 GMT
HTTP/1.1 500 Internal Server Error
Date: Thu, 20 Jul 2006 13:54:19 GMT
Server: Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)
Content-Length: 533
Connection: Close
Content-Type: text/xml; charset=utf-8
<?xml version = '1.0' encoding = 'UTF-8'?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring>system error: [10000] [de.test.webservices.WsException]</faultstring>
<faultactor>/app-Webservices-context-root/WebServices</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
What is the cause for the false <faultstring> in test b)? Where set the the ADF framework the NullPointerException and how can I avoid that?
Thanks and best regards,
Tobias