How to catch exception in JSP????

how to catch exception in JSP?
I use JDeveloper 3.1
I use connection with database .
When I insert record in database
when have duplicate of primary key
how to catch this exception and
back to previous page?
I trying with folowing:
<jsp:useBean id="RowEditor" class="oracle.jbo.html.databeans.EditCurrentRecord" scope="request">
<% try {
RowEditor.setUseJS(true);
RowEditor.initialize(pageContext, "package2_Package2Module.Drzavi1View");
RowEditor.setSubmitText("Save");
RowEditor.setTargetUrl("Drzavi1View_SubmitInsertForm.jsp");
RowEditor.createNewRow();
RowEditor.setReleaseApplicationResources(true);
RowEditor.render();
catch(Exception e) {
%>
<script>
alert("primary key duplication");
history.back();
</script>
<% } %>
but i't not working
please help me

i catch exceptions as you do, i don't have any problem...
are you throwing the exception from your bean?
actually i don't catch an Exception, but an SQLException...
but it works... here is my code...
try
myclass.addElement(); // this is an insert into Oracle
catch( DataBaseFailException e ) /// an exception that i throws inside after i receive an SQLException
session.setAttribute("gMessage","e.getMessage()); // error code

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at line: con = Database.createConnection();
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Thanks in advance.
Thanks & Regards,
Kothandaraman N.

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     public static final String sId = resourceBundle.getString("sId");The above are the String objects i'm checking for the match with values from login form.
Thanks & Regards,
Kothandaraman N.

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see
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How to catch exception from shared library on Linux?

Description:
JNI dynamically loads shared library. Shared library throws exception (class CTestException). JNI can not catch it by CTestException name, only (...) works.
My config:
Linux RH AS 4 (x86 64)
gcc: 3.4.5
glib: 2.2.5
Java 1.5.0_06
g++ compiler options for JNI and shared libraries:
g++ -Wl,-E -fPIC -shared ...
There are multiple bugs on Java bugs database regarding C++ ABI incompatibility between Java binaries and stdc++ libraries linked with native code. But I could not find any conclusions on these bugs. Only plans/suggestions to recompile Java on new gcc. These bugs were quite old (regarding Java 1.3, 1.4). Now 1.6 is available but still there is same incompatibility. Maybe I am missing something and there is a way to fix this problem? Like to use specific gcc/glib versions for compilation? How people solve such problems? Any help is appreciated.

It isn't any different; the commands are the same. You can find the exp executable in tehe $ORACLE_HOME/bin directory.

How to catch exception thrown by ActionBinding "Commit"

I need a programmatic branch after the following line if an exception is thrown:
((JUCtrlActionBinding) panelBinding.findCtrlBinding("Commit")).invoke();
I am building an ADFSwing application using JDev 10.1.3.
I have a ViewObject derived from an EntityObject that I am trying to use for an insert.
I have placed the line above in a try block with a "catch (JboException je)" block which includes the code I need to execute upon exception. A default error dialog appears when an exception is thrown "(oracle.jbo.AttrValException) JBO-27014: ...", but the catch block I have created is not executed.
The effect is that a commit is not fulfilled, the default error dialog appears, but the program continues undaunted.
I have included "setBundledExceptionMode(false)" just before the try block, but that doesn't make any difference.
The commit statement above, and the try/catch block I've described are in a JUPanel.
Any help on how and where I can catch an exception from the action binding is really appreciated!!

You can use code like this:
     JUCtrlActionBinding commit = (JUCtrlActionBinding)panelBinding.findCtrlBinding("Commit");
     commit.invoke();
     if (!commit.getErrors().isEmpty()) {
       /* Error list not empty. Something went wrong. */
     }

How to catch exception in JSP????

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