Using try{}..Catch()

Hi ,
Is there any way so that i can use 'try{} without catch() and finally{}.
Thanks

> Is there any way so that i can use 'try{} without
catch() and finally{}.
One would only use a try{} block in order to also use a catch/finally block. A try{} block doesn't do anything by itself per se; it sounds like you might be looking for a way to add the Exception to the method signature. Is this the case?
The Java� Tutorial - Lesson: Handling Errors with Exceptions

Similar Messages

How to use Try Catch Block in ABAP Like JAVA

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.
Thanks and Regards.
Vaibhav Tiwari.

Hi Vaibhav
You may not catch exceptions returned by function module using try endtry block.
It works well with the exception returned by methods.
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.
in case of exception returned by a method, do it like this...
data: excep type cx_root.
data: v_str type string.
try.
*any method call or division by zero (for ex)
catch cx_root into excep.
endtry.
if excep is not initial.
CALL METHOD   excep->if_message~get_text
receiving
    RESULT = v_str.
endif.
*display the value returned in v_str on screen

Error when using try catch inside oledb command to run stored procedure

Hi,
i'm using the below command to run some jobs using OLEDB Command
exec sp_start_job @job_name =?
and it runs successfully
when i put this code inside try catch block as below , it generates error and don't accept it
begin try
exec sp_start_job @job_name =?
end try
begin catch
end catch
the error message is "Syntax error, PErmission vaiolation or other nonspecific error"
do you know is there any problem using TRY catch insdie OLEDB command ?
Thanks ,
Ahmed Salah

Hi Ahmed,
According to your description, if an error raised that fails the package, then you want the package to continue execute.
To achieve this requirement, we can use Integration Services (SSIS) Event Handlers that we can create custom event handlers for an OnError event when an error occurs to continue processing rest of the package. For more details, please refer
to the following blog:
http://visakhm.blogspot.in/2013/03/error-handling-in-ssis-loops.html
If there are any other questions, please feel free to ask.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

Do I always need to use try/catch? [ newbie ]

Hi,
I have a method called methodOne that throws ExceptionXXX, and another method called methodTwo that uses methodOne and also throws ExceptionXXX.
public static methodOne() throws ExceptionXXX
Does methodTwo need to use try/catch to catch ExceptionXXX from methodOne, ( like the following code )
public static methodTwo() throws ExceptionXXX
try
methodOne();
catch( ExceptionXXX theException )
throw new ExceptionXXX;
or it isn't necessary ( like this code )?
public static methodTwo() throws ExceptionXXX
methodOne();
Thanks for the help,
Andre

Hi,
if you call a mthod w/ a throws declaration you hace two possibilities:
1. catch the Exception
2. pass the Exception by adding a throws declaration to the calling method
So, in your case the second example is a valid way to handle the Exception.
Also Andre

How do I use try/catch so that it loops until proper input is put in?

So I have a specific thing that I am asking for (double)... if user inputs letters instead i do try/catch... how do I have it loop until user puts in proper stuff?

i think i might have figured it out...
          String first = JOptionPane.showInputDialog("Enter the first number");
          while(num1 != double || num1 != int){
          try{
          num1 = Double.parseDouble(first);
          catch (NumberFormatException e){
               String first = JOptionPane.showInputDialog("Enter the first number");
          }now i need to figure out how to make
num1 != double || num1 != intpart work..

How to deal exception using try{}catch{}

I don't know which is a good way from catch a exception and throw a exception,
I means that how to use exception in java,catch ? throw?

Presumably you are not asking the same thing as here...
http://forum.java.sun.com/thread.jsp?thread=461313&forum=9&message=2114037
You catch an exception with code that looks like the following...
    try
      String s = null;
      int i = s.length(); // This throws an exception
    catch(NullPointerException e)
      // Do something
You throw an exception with the following...
    if (<some condition>)
       throw new Exception("Something bad happened");

Doubt try/catch/finally

Hi all
Say i have following program:
try {
line1.   functioncall()
line2.    .....
line3.    .....
catch(..) {
print error
finally{
System.out.println("In finally");
}As per my understanding if there is some error in try block , then control will skip to catch and then to finally.
And other way, if there is no error then all lines in try block will be executed and control has to go to finally block.
And i see that there is no error (i have used try catch inside line1 function call also)
Now I am facing this problem.
In try block, line 1 is executed and getting into finally and there is also no error so it has skipped catch block. And in try block line2 and line 3 are skipped.
Can anybody tell me why is it so.
thanks
Ravi

What might be the problem?Sunspots. Not enough fiber. Government conspiracy.
These are just guesses, which is all we can do unless you read and obey the following:
Please post a short, concise, executable example of what you're trying to do. This does not have to be the actual code you are using. Write a small example that demonstrates your intent, and only that. Wrap the code in a class and give it a main method that runs it - if we can just copy and paste the code into a text file, compile it and run it without any changes, then we can be sure that we haven't made incorrect assumptions about how you are using it.
Post your code between [code] and [/code] tags. Cut and paste the code, rather than re-typing it (re-typing often introduces subtle errors that make your problem difficult to troubleshoot). Please preview your post when posting code.

Try/catching errors occuring in synchronous event handlers

Hi,
I know that using try/catch in flash player it is possible to catch only synchronous errors, but recently I ran into code in our application which I strongly believe is synchronous but it behaves as if it wasn't.
In example below I create event listener and inside try/catch I dispatch event. Handler function throws error. Executing code stops when error is thrown, so message "after throwing error" won't be logged, but try/catch block catches nothing and code executes as if nothing happened after event dispatch.
Dispatching event on element executes handler method immediately so it is synchronous execution. Event call stack which is displayed in debug versions of flash player, shows every function from creation of class to execution of handler.
Generally flash applications relays heavily on events and in my case it caused ours users projects to be irreversibly corrupted, because of this continuing to work after error, which I even can't properly detect and handle, cause it's going throught 5 or more event handlers and adding try/catch to each handler would create enormous chaos in my code. So my question is why does flash player behaves like this? Are there any ways to tell compiled SWF file to treat such cases as synchronous calls, f.e. compilation parameters?
package
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.EventDispatcher;
    import flash.text.TextField;
    public class TestApp extends Sprite
        public var cTextField:TextField;
        public function TestApp()
            cTextField = new TextField();
            cTextField.width = 300;
            cTextField.height = 200;
            addChild(cTextField);
            onAppCreated();
        protected function onAppCreated():void
            var eventName:String = "my_event";
            var caughtError:Boolean = false;
            var dispatcher:EventDispatcher = new EventDispatcher();
            dispatcher.addEventListener(eventName, handler);
            try
                dispatcher.dispatchEvent(new Event(eventName));
            } catch (error:Error)
                caughtError = true;
            cTextField.text += caughtError ? "caught error\n" : "error wasn't caught\n";
        protected function handler(event:Event):void
            cTextField.text += "before throwing error\n";
            throw new Error("throw error");
            cTextField.text += "after throwing error\n";

Okay, nobody bit. Sorry.
The only way to really figure out what is going on is to look at a running example with a C++ debugger. I'm particularly curious about whether this problem happens in a specific browser/os combination (we may be working around a quirk of that platform), or if it's something that happens everywhere.
The most effective way to proceed is going to be to file a bug with a simplified, executable example (source and compiled SWF, ideally) that demonstrates the problem. This will help me route the bug to a developer and get you an answer in the shortest time possible.
You can file a bug here:
http://bugbase.adobe.com/
If you reply here with the bug number, I'll get it assigned to an engineer.
Thanks!

How to know if a UDF form is opened else then using a TRY CATCH ?

I'm looking for any way to find out if the UDF form is visible
else then trying to open it in a try catch and if it's not sending a key. This if very ugly, slow and not really my kind.
I tried to iterate through all the forms in SBO_Application.Forms but it's not there. All I see is the main form
I just need to make sure the UDF form is visible when Inventory form is loaded so I can put a value in one of the UDF
If there's a better way I'm buying it

Hi Marc,
Rather than putting your data in the UDF in the UDF side form, you can add a control to the main form (during the load event of the form) and bind this to the UDF through the DBDataSource that is already available on the main form. This means that you don't need to worry about whether the UDF form is open or not because you can always read or write to your UDF data from the main form.
Alternatively, the UDF form TypeEx property is always the same as the main form but with a minus sign in front. Therefore, if you know the TypeEx and FormTypeCount of the main form then you can use the GetForm method of the Application object to get the UDF form.
oForm = _sboApp.Forms.GetForm("-" + oMainForm.TypeEx, oMainForm.TypeCount);
You'd still need a try/catch around this and if it raises an error then activate the 6913 menu to open the UDF form.
Kind Regards,
Owen

Performance impact on using too much try catch block

I have several questions here:
1. The system that I'm developing requires to be high performance, but I am not sure how will try catch block affect overall performance.
2. I wanted to know which would be more efficient (result in faster processing)
Have several generic try catch OR catch all exceptions individually?
ex:
try {
} catch (Exception e){
}vs.
try{
} catch (MalformedUrlException me){
} catch(SQLException){
}3. Which one would be faster, one big try catch block or several small try catch blocks?
ex.
try{
//read from io file
//query database
//parse data
//write to file
//query database again
} catch(Exception e){
//log exception
}vs.
try{
//read from io file
} catch(FileNotFoundException fnfe){
//log exception
try{
//query database
}catch(SQLException se){
//log exception
try{
//parse data
}catch(SaxParserException saxe){
//log exception
try{
//query database again
}catch(SQLException se2){
//log exception
try{
//write to file
} catch(FileNotFoundException fnfe){
//log exception

1. The system that I'm developing requires to be high performance, but I am not sure how will try catch block affect overall performance.Compared to what? You can't write an equivalent program that doesn't have a try-catch block, so the answer would have to be that it doesn't affect performance at all.
2. I wanted to know which would be more efficient (result in faster processing)Have several generic try catch OR catch all exceptions individually?
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".
Here's what you should do. Write the code that needs to be written. Don't leave out necessary stuff because of performance reasons. (If you left out all your code, the program would run much faster.) Then find out which parts of the program ACTUALLY take the most time and work on speeding them up.

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 !

Can we have try/catch in a static block in a class?

hi All
i have a question about put a try/catch block in a static block in a class to catch exceptions that maybe thrown from using System.xxxx(). in my custom class, i have a static block to initialize some variables using System.xxx(). in case of any error/exception, i need to be able to catch it and let the caller know about it. i tried to put a try/catch block in the static block, and tried to rethrow the exception. but it is not allowed, how would i handle situation like this? thanks for your help and advise in advance.

You could just swallow the exception inside try/catch
block, and instead of throwing it out, just set a
static variable to allow checking from outside
whether the initialization succeeded, or check within
the constructor / methods of this class for
successful initialization, and throw the exception
then. You could even save that exception in a static
variable for later.Ouch, ouch, you're hurting my brain. This would allow someone to ignore a (presumably) fatal error. Throw a RuntimeException as indicated. You can wrap a checked exception in an unchecked one if need be.

Exception handling with try/catch in acrobat

Hi
I have a problem using a try/catch block in my acrobat document-script. Try to enter the following into the debugger-console:
try{nonexistentFunction();}catch(e){console.println('\nacrobat can't catch')}
and run it. The output will be:
nonexistentFunction is not defined
1:Console:Exec
acrobat can't catch
true
The whole point of a rty/catch block is for the application NOT to throw an exception, but instead execute the catch-part of the statement. However, acrobat does both: It throws an exception AND executes the catch-block.
Is there another way to suppress the exception, or to make the try/catch-block work as it's supposed to?

> Also Adobe provides for free the JS or compiled file for Acrobat Reader to support the JS console.
Where is that file located ? How to install it or where to place it ?
What is the method referred by try67 on his site where he sells a product ?
Is that the same as the compiled file you refer to ? or did he sell his solution to adobe ?
It is helpful if people can get an idea of the nature of choices available and make informed decisions, than a cloak and dagger approach.
For some jobs that we have, I have been very frustrated by a consultant who wont even give basic info for transparent billing despite all assurances for privacy, as a result we are forced to do the job ourselves.
Dying Vet

About the finally block of the try catch.

I know that finally block contains the code that will be executed in any condition of the try catch.
However, I think it is unneccessary, since the stack after the try catch stack will be executed any way.
Any one can help?
for example
try{
System.in.read();
catch(Exception e){}
finally
{ System.out.println("does this matter?");}and
try{
System.in.read();
catch(Exception e){}
System.out.println("does this matter?");

However, I think it is unneccessary, since the stackafter the try catch
stack will be executed any way.That does assume that you catch and handle the error
appropriately.
Of course this is valid as well, and demonstrates
when you would WANT a finally clause.
Connection con = null;
Statement stmt = null;
try{
con = Database.getConnection();
stmt = con.createStatement("Select * from dual");
// maybe something throws an exception here?
finally{
if (stmt != null){
stmt.close();
if (con != null){
con.close();
The finally block here might throw a null pointer exception itself use
null!=stmt null!=stmt

Return statement and Try Catch problem

Hi!!
I've got the next code:
public ResultSet DBSelectTeam(String query) {
try {
Statement s = con.createStatement();
ResultSet rs = s.executeQuery(query);
return rs;
} catch (Exception err) {
JOptionPane.showMessageDialog(null, "ERROR: " + err);
But I need a return statement in the catch-block, but I don't know what's the best option.
Help...
Many thanks.

The error message is: "missing return statement", Yes, I know.
You have to either return from the catch statement, or throw from the catch statement, or return or throw after the catch statement.
The only ways your method is allowed to complete is by returning a value or throwing an exception. As it stands, if an exception is thrown, you catch it, but then you don't throw anything and you don't return a value.
So, like I said: What would you return from within or after catch? There's no good value to return. The only remotely reasonable choice would be null, but that sucks because now the caller has to explicitly check for it.
So we conclude that catch shouldn't return anything. So catch must throw something. But what? You could wrap the SQLE in your own exception, but since the caller is dealing with JDBC constructs anyway (he has to handle the RS and close it and the Statement), there's no point in abstracting JDBC away. Plus he has to deal with SQLE anyway in his use of the RS and Statement. So you might as well just throw SQLE.
So since you're going to just throw SQLE anyway, just get rid of the try/catch altogether and declare your method throws SQLException

Using try{}..Catch()

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