Nested try-catch blocks
Hello All,
If I have 2 nested try-catch blocks see below
try{
//Some code
try{
//Code that throws an IOException
}catch(NumberFormatException nfe){
//Handle the NFE
}catch(Exception e){
//Handle the Exception
}Now what happens if in the inner try-catch an IOException is thrown? Will it be ignored, or will it get thrown out to the outer one and be caught by that catch?
Thanks,
Matt
Thanks, should have just done this from the start, but here is the result...
The following code
public class Main {
public void execute(){
try{
try{
for(int i=0;i<100;i++){
System.out.println(i);
if(i==5){
throw new java.io.IOException();
}catch(NumberFormatException nfe){
System.out.println("caught in inner block");
}catch(Exception e){
//Handle the Exception
System.out.println("caught in outer block");
public static void main(String[] args) {
Main m = new Main();
m.execute();
}GENERATES:
0
1
2
3
4
caught in outer block
Thanks,
Matt
Similar Messages
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Need HELP with finally() in nested try-catch
hi,
i am having trouble with deadlock and wondering if its due to an incorrect use of finally nested within multiple try catch blocks.
is the inner finally() required, will the outer one get executed, or will the two finally() statements get executed...??
the deadlock happens very infrequently to accurately test.
try {
try {
catch (InterruptedException e) {
return;
catch {
finally {
//will this be executed be executed by the inner throw statement
}or is an inner finally required
try {
try {
catch (InterruptedException e) {
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//this finally is NEW....is it needed!
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catch {
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more info pls.I mean, really. How hard is it to find out for yourself?
public class TestFinally {
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try {
try {
throw new RuntimeException("Whatever");
} finally {
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} finally {
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Can't find class because of try catch block ?!
Hello,
I'm using the JNI to use a java library from my c++ code.
JNI can't find the "Comverse10" class below, but when i put the try catch block in createMessage in comment, FindClass succeeds ?!
Unfortunatly i need the code inside the try block ;-)
I tried a few things, but none of them worked:
- let createMessage throw the exception (public void createMessage throws ElementAlreadyExistsException ), so there isn't a try catch block in createMessage => result: the same
- make a "wrapper" class Comverse that has a Comverse10 object as attribute and just calls the corresponding Comverse10.function. Result: Comvers could be found, but not constructed (NewObject failed).
Can someone tell me what is going on ?!
Thank you,
Pieter.
//Comverse10 class
public class Comverse10 {
MultimediaMessage message;
/** Creates a new instance of Comverse10 */
public Comverse10() {
public void createMessage() {
TextMediaElement text1 = new TextMediaElement("Pieter");
text1.setColor(Color.blue);
SimpleSlide slide1 = new SimpleSlide();
//if i put this try catch block in comment, it works ?!
try{
slide1.add(text1);
catch(com.comverse.mms.mmspade.api.ElementAlreadyExistsException e){}
MessageContent content = new MessageContent();
content.addSlide(slide1);
this.message = new MultimediaMessage();
message.setContent(content);
message.setSubject("Mijn subjectje");
for those of you who are intersted: here's my C++ code:
//creation of JVM
HRESULT Java::CreateJavaVMdll()
HRESULT HRv = S_OK;
char classpath[1024];
jint res;
if(blog) this->oDebugLog->Printf("CreateJavaVMdll()");
strcpy(classpath,"-Djava.class.path="); /*This tells jvm that it is getting the class path*/
strcat(classpath,getenv("PATH"));
strcat(classpath,";D:\\Projects\\RingRing\\MMSComposer;C:\\Progra~1\\j2sdk1~1.1_0\\lib"); //;C:\\Comverse\\MMS_SDK\\SDK\\lib\\mail.jar;C:\\Comverse\\MMS_SDK\\SDK\\lib\\activation.jar;C:\\Comverse\\MMS_SDK\\SDK\\lib\\mmspade.jar
//------Set Options for virtual machine
options[0].optionString = "-Djava.compiler=NONE"; //JIT compiler
options[1].optionString = classpath; //CLASSPATH
//------Set argument structure components
vm_args.options = options;
vm_args.nOptions = 2;
vm_args.ignoreUnrecognized = JNI_TRUE;
vm_args.version = JNI_VERSION_1_4;
/* Win32 version */
HINSTANCE hVM = LoadLibrary("C:\\Program Files\\j2sdk1.4.1_01\\jre\\bin\\client\\jvm.dll");
if (hVM == NULL){
if(blog) oDebugLog->Printf("Can't load jvm.dll");
return E_FAIL;
if(blog) oDebugLog->Printf("jvm.dll loaded\n");
LPFNDLLFUNC1 func = (LPFNDLLFUNC1)GetProcAddress(hVM, "JNI_CreateJavaVM");
if(!func){
if(blog) oDebugLog->Printf("Can't get ProcAddress of JNI_CreateJavaVM");
FreeLibrary(hVM); hVM = NULL;
return E_FAIL;
if(blog) oDebugLog->Printf("ProcAddress found");
res = func(&jvm,(void**)&env,&vm_args);
if (res < 0) {
if(blog) oDebugLog->Printf("Can't create JVM with JNI_CreateJavaVM %d\n",res);
return E_FAIL;
if(blog) oDebugLog->Printf("JVM created");
return HRv;
//finding Comverse10 class:
HRESULT CALLAS MMSComposer::InitializeJNI(void)
HRESULT HRv=E_FAIL;
DWORD T=0;
try
if(blog) oDebugLog->Printf("\nInitializeJNI()");
bJVM = FALSE;
jni = new Java(oDebugLog);
if(jni->CreateJavaVMdll()!=S_OK){
if(blog) oDebugLog->Printf("CreateJavaVMdll() failed");
return HRv;
jclass jcls = jni->env->FindClass("Comverse10");
if (jcls == 0) {
if(blog) oDebugLog->Printf("Can't find Comverse10 class");
jclass jcls2 = jni->env->FindClass("test");
if (jcls2 == 0) {
if(blog) oDebugLog->Printf("Can't find test class");
return HRv;
if(blog) oDebugLog->Printf("test class found %08x",jcls2);
return HRv;
if(blog) oDebugLog->Printf("Comverse10 class found %08x",jcls);
jmethodID mid = jni->env->GetMethodID(jcls , "<init>", "()V");
if (mid == 0) {
if(blog) oDebugLog->Printf("Can't find Comverse10() constructor");
return HRv;
if(blog) oDebugLog->Printf("Comverse10() constructor found");
jobject jobj = jni->env->NewObject(jcls,mid);
if(jobj==0)
if(blog) oDebugLog->Printf("Can't construct a Comverse10 object");
return HRv;
if(blog) oDebugLog->Printf("Comverse10 object constucted");
//Create Global reference, so java garbage collector won't delete it
jni->jobj_comv = jni->env->NewGlobalRef(jobj);
if(jni->jobj_comv==0)
if(blog) oDebugLog->Printf("Can't create global reference to Comverse10 object");
return HRv;
if(blog) oDebugLog->Printf("global reference to Comverse10 object %08x created",jni->jobj_comv);
bJVM=TRUE;
HRv=S_OK;
} catch( IDB * bgError ) { throw bgError->ErrorTrace("InitializeJNI::~InitializeJNI",HRv, 0, T); }
catch(...) { throw IDB::NewErrorTrace("InitializeJNI::~InitializeJNI",HRv, 0, T ); }
return HRv;>
I would guess that the real problem is that that the
exception you are catching is not in the class path
that you are defining.Thanks jschell, that was indeed the case.
I don't have the docs, but I would guess that
FindClass() only returns null if an exception is
thrown. And you are not checking for the exception.
Which would tell you the problem.Ok, i'll remember that. But what with exceptions thrown in my java code, the documents say
// jthrowable ExceptionOccurred(JNIEnv *env);
// Determines if an exception is being thrown. The exception stays being thrown until either the native code calls ExceptionClear(), or the Java code handles the exception
so, what if the java code throws an exception and catches it, will i be able to see that in my c++ code with ExceptionOccurred ?
or
should the java method be declared to throw the exception (and not catch it inside the method)
Again, thank you for your help, it's greatly appreciated ! -
How to get the returned error messages in the Try/Catch block in DS 3.0?
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I am trying to implement the Try/Catch for error handling, but I have
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Can you tell me or point me to sample code that can do this, also, can
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I have several questions here:
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2. I wanted to know which would be more efficient (result in faster processing)
Have several generic try catch OR catch all exceptions individually?
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} catch (Exception e){
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//parse data
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You still have it backwards. Do you need to do different things for different exceptions? If so, then that's what you have to do and there is no other code that might be "faster".
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This may be too vague of a question but is it bad practice to use one large try catch block? In my mind it seems like it would produce "cleaner" code as far as programmer reading is concerned, but does it affect the program adversely?
try {
// code goes here
} catch (somekindofexception e){
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I was mistaken it looks like the particular function I was thinking of throws 3 kinds of RuntimeExceptions, but the same idea applies right?
try {
} catch (RuntimeException e) {
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Yes, you can do that if you want to handle all of them the same.
However, if you want to handle different exceptions differently, you'd catch those specific exceptions, rather than the parent exception type. This is a separate issue from whether you have one big try or lots of little trys.
NOTE HOWEVER THAT YOU SHOULD NOT CATCH RuntimeException OR ITS DESCENDANTS. RuntimeException indicates an error in your code. Catching it is usually pointless, because you can't recover from it, and trying to continue on will probably lead to corrupt results at best. -
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Hi Experts,
I am using BAPI to post MIGO in one of my application. If the MIGO is successfully gets posted then BAPI returns no message, but if there is some error in posting then it returns an error message. Now I want to print that error message in catch block by calling method RAISE_ERROR_MESSAGE. How to use try catch block in ABAP. Please suggest with example.
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In case of function modules or BAPI what u can do is to check sy-subrc returned and give message accordingly. If it returns a structure like bapireturn then display message returned.
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Revision: 10953
Author: [email protected]
Date: 2009-10-09 10:50:37 -0700 (Fri, 09 Oct 2009)
Log Message:
Get rid of a try/catch block that was generating a lot of noise on the heap.
QE Notes: None
Doc Notes: None
Bugs: SDK-23563
Reviewer: Ryan
API Change: no
Is noteworthy for integration: No
tests: checkintests mustella/Managers/DragManager
Ticket Links:
http://bugs.adobe.com/jira/browse/SDK-23563
Modified Paths:
flex/sdk/branches/3.x/frameworks/projects/framework/src/mx/managers/dragClasses/DragProxy .asRevision: 10953
Author: [email protected]
Date: 2009-10-09 10:50:37 -0700 (Fri, 09 Oct 2009)
Log Message:
Get rid of a try/catch block that was generating a lot of noise on the heap.
QE Notes: None
Doc Notes: None
Bugs: SDK-23563
Reviewer: Ryan
API Change: no
Is noteworthy for integration: No
tests: checkintests mustella/Managers/DragManager
Ticket Links:
http://bugs.adobe.com/jira/browse/SDK-23563
Modified Paths:
flex/sdk/branches/3.x/frameworks/projects/framework/src/mx/managers/dragClasses/DragProxy .as -
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Hey guys,
I have several try-catch blocks around potential NumberFormatException's. Well the variables and values given inside the try-catch block can not be used outisde, so how do i get them out or use them outside this block.
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variable i might not have been initialized
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^
Or declare the method as throwing the exception so
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throws NumberFormatException
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Each has its benefits. Depends what sort of method
you're writing - if failure of the try block causes
the whole method to fail, don't try to handle the
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ServerSocketChannel ssc;
ServerSocket ss;
try {
// wait for a connection
try {
sc = ssc.accept();
sc.read(bb);
finally {
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sc.close();
catch (IOException e) {
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ServerSocketChannel ssc;
ServerSocket ss;
try {
// wait for a connection
sc = ssc.accept();
sc.read(bb);
catch (IOException e) {
log.error("accept or read error", e);
finally {
try {
if (sc != null) // in case accept() fails
sc.close();
catch (IOException e) {
log.error("close error", e);
}In the first case you have a nested try block in the first try with a finally to do the close(). In the second case the finally is part of the big try block and nested within the finally block is another try block for the close().
Does it matter?(The second declaration should be SocketChannel sc.)
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Hi everyone-
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Any ideas on how to resolve this? I know I could use a switch in a standard java, but not sure if that works with applet/try-catch.
Thanks again,
KimberlyYou need to use "else" clauses here.if(t1.length() == 0 || t2.length() == 0 || t3.length() == 0)
output.append("\nPlease complete the required fields and try again.");
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Help with reducing try catch blocks
Hi,
I have an object of a class having about 100 get methods. I have about 300 such objects. I want to get all the parameters from all the 100 get methods for all the objects, and for each failed get methods, an exception occurs,
Now I can loop from - to no of objects but inside I have to declare 100 try catch methods for each get methods.
for(i=0;i< 300;i++) {
try {
a.getname;
catch { --- }
try{
a[i].getno ;
catch { -- }
100 such a[i].getXYZ methods
any alternative. wanted to avoid all the try catch statements
Please suggest
thankstarkesh wrote:
Its actually a serialized object, which I am trying to extract parameters from. So I actually need to know exactly which get method is failing for which object, as the objects can be in error when they get transported over the network.If it was me I would generate the code so the actual mechanism becomes moot.
But you can use something like the following (generated or not.)
String attrName="<Unknown>"
try
attrName = "attr1";
attr1=instance.attr1;
attrName = "attr2";
attr2 = instance.attr2;
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Nested Try/Catch in a stored procedure going to outer
I am using Service Broker to move data to a historical database and then delete it from the current table in a second stored procedure that gets the information passed to it; which I have working but what I am having trouble with is when there
is an error in the second stored procedure rather than going to the catch in the second Stored procedure it goes back up to my first one.
CREATE PROCEDURE [sp_PkgDelActivator_SB]
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
DECLARE @RecvReqDlgHandle UNIQUEIDENTIFIER;
DECLARE @RecvReqMsg XML;
DECLARE @RecvReqMsgName sysname;
BEGIN TRY
WHILE (1=1)
BEGIN
BEGIN TRAN
--Get the top item on the queue.
WAITFOR
( RECEIVE TOP(1)
@RecvReqDlgHandle = conversation_handle,
@RecvReqMsg = message_body,
@RecvReqMsgName = message_type_name
FROM DeleteReceiveQueue
), TIMEOUT 5000;
IF (@@ROWCOUNT = 0)
BEGIN
ROLLBACK TRANSACTION;
BREAK;
END
ELSE
COMMIT TRAN
EXEC sp_PkgDeleteHeap_SB
@RecvReqDlgHandle = @RecvReqDlgHandle,
@RecvReqMsg = @RecvReqMsg
END
END TRY
BEGIN CATCH
DECLARE @ERR_NR INT = ERROR_NUMBER(),
@ERR_SVR_NR TINYINT = ERROR_SEVERITY(),
@ERR_STT_NR TINYINT = ERROR_STATE(),
@ERR_PRC_TE VARCHAR(50) = ERROR_PROCEDURE(),
@ERR_LN_NR INT = ERROR_LINE(),
@ERR_MSG_TE VARCHAR(1000) = ERROR_MESSAGE()
IF @@TRANCOUNT > 0
ROLLBACK TRAN
INSERT INTO DB_ERR_LOG(
ERR_NR,
ERR_SVR_NR,
ERR_STT_NR,
ERR_PRC_TE,
ERR_LN_NR,
ERR_MSG_TE,
LOG_DT)
SELECT
@ERR_NR,
@ERR_SVR_NR,
@ERR_STT_NR,
@ERR_PRC_TE,
@ERR_LN_NR,
@ERR_MSG_TE,
GETDATE()
END CATCH
END
CREATE PROCEDURE [sp_PkgDeleteHeap_SB]
@RecvReqDlgHandle UNIQUEIDENTIFIER,
@RecvReqMsg XML
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
BEGIN TRY
BEGIN TRANSACTION
DECLARE @dtArrival date = 'gotten from somewhere else'
IF @dtArrival BETWEEN '2014-07-01' AND '2014-09-30'
BEGIN
'Code to move and delete rows from a table'
END
ELSE IF @dtArrival BETWEEN '2015-01-01' AND '2015-03-31'
BEGIN
'Code to move and delete rows from a table'
END
ELSE IF @dtArrival BETWEEN '2015-04-01' AND '2015-06-30'
BEGIN
'Code to move and delete rows from a table'
END
END CONVERSATION @RecvReqDlgHandle WITH CLEANUP;
END
COMMIT TRAN
END TRY
BEGIN CATCH
ROLLBACK TRAN
DECLARE @ERR_NR INT = ERROR_NUMBER(),
@ERR_SVR_NR TINYINT = ERROR_SEVERITY(),
@ERR_STT_NR TINYINT = ERROR_STATE(),
@ERR_PRC_TE VARCHAR(50) = ERROR_PROCEDURE(),
@ERR_LN_NR INT = ERROR_LINE(),
@ERR_MSG_TE VARCHAR(1000) = ERROR_MESSAGE()
'Code to send the message back into the queue'
INSERT INTO DB_ERR_LOG(
ERR_NR,
ERR_SVR_NR,
ERR_STT_NR,
ERR_PRC_TE,
ERR_LN_NR,
ERR_MSG_TE,
LOG_DT)
SELECT
@ERR_NR,
@ERR_SVR_NR,
@ERR_STT_NR,
@ERR_PRC_TE,
@ERR_LN_NR,
@ERR_MSG_TE,
@END_TS
END CATCH
END
Thanks for any help.
Also if this is not the right area for this question I am sorry please tell me and I will try moving it to the right area.>>Please guide me how to create Stored Procedure and how to load datas into Flatfile table and from Flatfile Table to Parent and Child Table.
Can you try loading the data using SSIS package ? If that's not an option , you could try OPENROWSET
--from the linkUSE AdventureWorks2012;
GO
CREATE TABLE myTable(FileName nvarchar(60),
FileType nvarchar(60), Document varbinary(max));
GO
INSERT INTO myTable(FileName, FileType, Document)
SELECT 'Text1.txt' AS FileName,
'.txt' AS FileType,
* FROM OPENROWSET(BULK N'C:\Text1.txt', SINGLE_BLOB) AS Document;
GO
Satheesh
My Blog |
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Return statement in a try catch block
Hi friends
Take a look in the code bellow
try
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Code to embed my video in other sites?
Hello folks! I will be putting video on my website using iWeb. Simple enough (I hope!) However, I need to be able to provide code to my customers so that they can embed the video into their own website... the same way that YouTube allows you to do th
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Polling for active floating panel in LV7.0
My application has many windows open simultaneously (flexible, configurable data display, each running in its own thread). In previous versions of labview, I used the fp.frontmost propery to arrange the window stack periodically. This is clumsy, and