API Classes & Methods - Book / Websites / References / Pointers ?

Hi,
Could some body point me to good resource for reading and practising about various API classes that are provided in Java. Since some of the books that I have seen does not provide much information about these things. I am looking for information regarding indepth or intermediate information regarding the API classes available in java like System, lang, ui, awt, util, etc.
Thanks in advance.
PK

lang, ui, awt, util aren't classes.
ave a look at the tutorials on this site, and the API docs. That'll contain most of what you'd need to know. If you're really curious, have a look at the source.

Similar Messages

Access of undefined method/property through reference with a static type Class

I get the following error: (it's not word for word but you get the idea)
Error: Access of undefined method getStatus through reference with a static type Class.
Here's what's happening in the code. I'm trying to create a User class that is instantiated at the start of my app. I want the User class to have properties like mainStatus, with helper methods like setStatus etc. Pretty simple.
so on my HardDisk I have my flash_working folder with all my flash projects. I created my class file/package under the directory com.mypackage
package com.mypackage
    import flash.display.*;
    public class User extends Sprite
        public var mainStatus:int;
        public function User()
            trace("User Created!");
            mainStatus = 0;
        public function setStatus(status:int):void
         mainStatus = status;
    public function getStatus():int
        return mainStatus;
Ok, so far so good.
now I created a new .fla file under the root of /flash_working/. The class file is in /com/mypackage/User.as
in my .fla file I have:
import com.mypackage.User;
var myUser:User = new User();
var i = User.getStatus();
trace(i);
That's all the code I have. Could someone please explain why it's giving me that error?
If I try to access the public var mainStatus through user.mainStatus that gives a similar error saying:
Error: Access of undefined property mainStatus through reference with a static type Class.
Thanks for any help!
jef3189

the public getStatus() function that you created needs to be referred to through an instance of the class.
So:
import com.mypackage.User;
var myUser:User = new User();
var i = myUser.getStatus();
trace(i);
Also, an aside. You can create a getter/setter for status, to avoid having to do the function as such.
package com.mypackage
    import flash.display.*;
    public class User extends Sprite
        public var mainStatus:int;
        public function get status():int
            return mainStatus;
        public function set status(value:int):void
             mainStatus = value as int;
          public function User()
            trace("User Created!");
            mainStatus = 0;
And then, you can call it as:
import com.mypackage.User;
var myUser:User = new User();
trace(myUser.status);
EDIT
I just noticed that you made the variable public as well, which means you can access it without getter/setter or function.
import com.mypackage.User;
var myUser:User = new User();
trace(myUser.mainStatus);

Can we use iTunes music API to our own website? But only want audio.

Hi Everyone,
Trying to integrate iTunes music API to our own website but just want only audio API to call. Please let me know steps to do this.
Thanks in advance.

Hi,
Indexing all fields in a record is possible in BDB but is fairly expensive since an index record will be written for every field. If you have a relatively small data set then perhaps this is not a problem, but be sure to do performance testing.
The common approach is to use a single secondary database (index) to create a many-many relationship. The key for this index will include the field name as well as the field value. This means that all fields can be indexed, including new fields that are added, using a single index and without changing code when new fields are stored.
Indexes are created using Environment.openSecondaryDatabase. In the SecondaryConfig that you pass to this method:
- Call setSortedDuplicates(true) since more than one record can have the same key.
- Call setMultiKeyCreator(...) since the index will contain multiple keys for a single record.
You implement the SecondaryMultiKeyCreator interface to extract the keys from your JSON record. This returns a set of keys, one for each field you want to index.
The format of the index key can be anything you'd like (as you know BDB uses byte arrays for keys). For example, you could use a string of the form NAME:VALUE as the key, so that you could do your lookups using that format. To serialize a string as bytes, use a class in com.sleepycat.bind.tuple such as StringBinding.
To do your lookups, pass your index key (NAME:VALUE) to SecondaryDatabase methods such as get().
See the javadoc for SecondaryDatabase, SecondaryConfig, SecondaryMultiKeyCreator. An example is in examples/je/ToManyExample.java.
Would something like that work for you?
--mark

The 'this' object in class methods

The book I'm reading says that the 'this' object needs to be initialized in every class method. Does it have to be explicitly initialized or can it be implicit? and if it can be implicit, how would you do that?(code wise)

Actually, I think it is correct to say that 'this' needs to be initialized. In a constructor, you cannot make a reference to the 'this' reference until the super constructor gets called. If you do not explicitly call the super constructor, then a call to the no argument super constructor gets inserted. If there isn't a no argument super constructor, then you must either make a call to one of the super constructors that is defined, or make a call to another constructor in that class. Until after that point, the 'this' reference is not valid.

In webdynpro ,Passing field symbols as values to class methods

Hi
Please tell me the ways of accessing database in webdynpro abap(not directly). I am calling Class method for accessing database. As currently I am directly accessing database in my webdynpro application. I have created a class and method for the same.
In my method I want to use select statement which will return table with values to webdynpro application. So for select statement(Calling Method) I need to use my field symbol values as where in clause .
Could anyone please help with example code?
Thanks,
Ujjwal

data: in_line type ref to data.
CREATE DATA in_line LIKE LINE OF <dyn_tab>.
ASSIGN in_line->* TO <dyn_wa>.
You can create a data reference and assign it to a field symbol and change the values. direclty passing field symbols is not possible.
Abhi

Need Help with command line arguments for a class method

Hey guys,
I'm fairly new to programming in java.
I want to a write a class method that adds up its command line arguments which are numbers. For example, if the input was .... 5 2 3....then the output would be 10.
I have been told to use the Convert to convert a string to a double. I'm ok for writing the class method but I have no idea how to use Convert and why I need it in the method.
Can anybody help please?

Hey guys,
I'm fairly new to programming in java.
I want to a write a class method that adds up its
command line arguments which are numbers. For
example, if the input was .... 5 2 3....then the
output would be 10.Okay. So you would receive the numbers to add as the String[] argument to a main method. The steps are simple:
1) declare a variable for the count
2) for each String in the array:
2.1) extract the value as a double
2.2) add this to the count
3) output the resulting count
I have been told to use the Convert to convert a
string to a double.
I'm ok for writing the class
method but I have no idea how to use ConvertThere is no class Convert in the Java API.
and why
I need it in the method. Do you understand you need to somehow convert each String to a double (step 2.1)? Since Convert is unknown to me, maybe you should just take a look at class Double. It can help you do step 2.1, the rest should be trivial enough.
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Double.html
Give it a go and feel free to post back with a specific problem you are having, accurately described if you please :-)

Calling the super class method from the subclass

Hi all,
I have a question about inheritence and redefinition of methods. Is it possible to call the superclass implementation of a method which is redefined in the subclass in another method of the subclass?There are possbilities like creation of an explicit super class instance or delegating the super class method implementation to another method which is also protected etc. What i mean is, is there a direct way of calling it?We have ,me, as the reference for the instance we have(which is the subclass instance in this case), is there also a way of pointing the superclass implementation(with super we can reference in the subclass redefinition, my question is if we have such a parameter in other methods of the subclass too)
Thanks in advance
Sukru

Hi,
The super reference can only be used in redefined methods to call superclass implementation . So probably what you can do is use upcasting and access the required superclass implementation. I can think of only this way...;-)
Ex data lr_super type ref to cl_superclass
lr_super = lr_subclass.
lr_super->method().
~Piyush Patil

Invoking Derived Class Method

Hi pls go through the below code, can any one give me solution how to access the Derived class method in this Point.
Note: In the below code , only in runtime we will come to know which Derived class method is going to invoke(So in runtime we will get Derived class name in the form of String). So Iam trying to Use Class.forName("Clas name") to create the instance of the Derived class and then type casting to base class.
Why iam casting to base class is , since only in the run time we are geting the Derived class name.
Result : iam geting the compiletime error says that no valid method fond in Mybase though it contains the reference of derived.
abstract class MyBase
public void display(int i)
System.out.println(" Base class Method");
class MyDerived extends MyBase
public void display(String str)
System.out.println("Derived class Mthode");
class MyMain
public static void main(String arg[])
String DrivObj=arg[0];
MyBase baseObj=(MyBase) Class.forName("DrivObj").newInstance();
baseObj.display("SomeString"); }
}

The problem is, can not have subclass reference bcoz
iam geting the subclass name only in the runtime and
one more thing is cant touch my base and subclass to
do changes as u said Your design is then definately very bad.
, is there any other way to do
it.Yes, you can use reflection to invoke the method.
Kaj

Dynamic Call Function/Class Method

Hi,
I have a requirement for which I need your help.
I want to Call a Method dynamically inside a program. how to do it?
My another quary is that how to call more than one class method dynamicaly in the program one at a time, based on certain conditions.
All the requirements mentioned above feels awakward to me, but are they feasible. Eagerly waiting for a reply.
Regards,
Pulokesh
Moderator message - Cross post locked
Edited by: Rob Burbank on Oct 26, 2009 9:48 AM

Hello,
you can call a Method like this where the name of the method is concatenated.
CONCATENATE 'SC_' me->gf_scenario '_SAVE' INTO lf_method.
CALL METHOD me->(lf_method).
Than I can imagine to loop over a tabele with all the Method Call to be executes un there:
Loop at gt_meth_calls into ls_meth_call.
ls_meth_call-object_instance->(ls_meth_call-meth_name).
endloop.
The table should be structured such that the first component contains a reference to the instance and the second component will be the Method name to run.

Static Classes/Methods vs Objects/Instance Classes/Methods?

Hi,
I am reading "Official ABAP Programming Guidelines" book. And I saw the rule:
Rule 5.3: Do Not Use Static Classes
Preferably use objects instead of static classes. If you don't want to have a multiple instantiation, you can use singletons.
I needed to create a global class and some methods under that. And there is no any object-oriented design idea exists. Instead of creating a function group/modules, I have decided to create a global class (even is a abstract class) and some static methods.So I directly use these static methods by using zcl_class=>method().
But the rule above says "Don't use static classes/methods, always use instance methods if even there is no object-oriented design".
The book listed several reasons, one for example
1-) Static classes are implicitly loaded first time they are used, and the corresponding static constructor -of available- is executed. They remain in the memory as long as the current internal session exists. Therefore, if you use static classes, you cannot actually control the time of initialization and have no option to release the memory.
So if I use a static class/method in a subroutine, it will be loaded into memory and it will stay in the memory till I close the program.
But if I use instance class/method, I can CREATE OBJECT lo_object TYPE REF TO zcl_class then use method lo_object->method(), then I can FREE lo_object to delete from the memory. Is my understanding correct?
Any idea? What do you prefer Static Class OR Object/Instance Class?
Thanks in advance.
Tuncay

@Naimesh Patel
So you recommend to use instance class/methods even though method logic is just self-executable. Right?
<h3>Example:</h3>
<h4>Instance option</h4>
CLASS zcl_class DEFINITION.
METHODS add_1 IMPORTING i_input type i EXPORTING e_output type i.
METHODS subtract_1 IMPORTING i_input type i EXPORTING e_output type i.
ENDCLASS
CLASS zcl_class IMPLEMENTATION.
METHOD add_1.
    e_output = i_input + 1.
ENDMETHOD.
METHOD subtract_1.
    e_output = i_input - 1.
ENDMETHOD.
ENDCLASS
CREATE OBJECT lo_object.
lo_object->add_1(
exporting i_input = 1
importing e_output = lv_output ).
lo_object->subtract_1(
exporting i_input = 2
importing e_output = lv_output2 ).
<h4>Static option</h4>
CLASS zcl_class DEFINITION.
CLASS-METHODS add_1 IMPORTING i_input type i EXPORTING e_output type i.
CLASS-METHODS subtract_1 IMPORTING i_input type i EXPORTING e_output type i.
ENDCLASS
CLASS zcl_class IMPLEMENTATION.
METHOD add_1.
    e_output = i_input + 1.
ENDMETHOD.
METHOD subtract_1.
    e_output = i_input - 1.
ENDMETHOD.
ENDCLASS
CREATE OBJECT lo_object.
lo_object->add_1(
zcl_class=>add_1(
exporting i_input = 1
importing e_output = lv_output ).
lo_object->subtract_1(
zcl_class=>subtract_1(
exporting i_input = 2
importing e_output = lv_output2 ).
So which option is best? Pros and Cons?

[AUDITOR] Class/Method:AuditEngine/finishTransaction encounter some problem

For getting the roles assigned to a user ,I connect to OIM .I am getting the following exception on executing the operation on the JBOSS console -
16:04:10,218 WARN [DATABASE] Trying to get the connection count : 4
16:04:10,218 ERROR [DATABASE] Class/Method: DirectDB/getConnection encounter some problems:
Error while retrieving database connection.Please check for the follwoing
Database srever is running.
Datasource configuration settings are correct.
16:04:10,234 ERROR [AUDITOR] Class/Method: AuditEngine/finishTransaction encounter some problems: {1}
java.lang.NullPointerException at com.thortech.xl.util.JDBCUtils.prepareStatement(Unknown Source)
at com.thortech.xl.dataaccess.tcDataBase.writePreparedStatement(UnknownSource)
at com.thortech.xl.dataobj.PreparedStatementUtil.executeUpdate(Unknown Source)
Any pointers as to why this exception occurs will be helpful.
Thanks !

user11957197 wrote:
Hi,
I am getting this error in my log files when I run our custom Role add schedule task:
Class/Method: tcReconciliationOperationsBean/ignoreEventAttributeData encounter some problems: Data Not Found.
BUt with error I cannot figure out where is the problem. Whether the user account is not present in IDM or user role data in not present in Child view data. Please help if anybody have faced such error before.
Thanks,
Kalpana.Which OIM version do you work with?

Overiding super class method to an abstract method

public class Super
public void doSomethingUseful()
public abstract class Sub extends Super
public abstract void doSomethingUseful();
What is the OO principle behind this?
When do we need to override a super class method in subclass as an abstract?

Lets first look at a simple design pattern called "Template Method".
public abstract class Library
private void collectBooks()
// collect books here
private void putBookInShelf()
// put books in shelf here
// abstract method sortBooks()
public abstract void sortBooks();
public void processBooks()
collectBooks();
sortBooks();
putBooksInShelf();
this class is an abstract class giving an abstract method called "sortBooks()", what is it useful for? We can make a subclass and implement sortBooks() to sort the books as we want (title wise, author wise, date wise, publisher wise) and then simply call processBooks() to process them.
One Sub class may look like:
public class MyLibrary extends Library
public void sortBooks()
// sort books by title b/c I like them sorted out by title
Another sub-class may look like
public class HisLibrary extends Library
public void sortBooks()
// sort books by Author, b/c he likes his books sorted out by author
Now client will say:
public static void main(String str[])
MyLibrary mylib=new MyLibrary();
mylib.processBooks(); // books will be processed by sorting them title wise
HisLibrary hislib=new HisLibrary();
hislib.processBooks(); // books will be processed by sorting them author wise
So in Library class, method "sortBooks()" was a template method allowing subclasses to sort the books as they want while all other functionality was implemented by Library class itself.
Now if we go back to your example, a method which is concrete in super class that you converted into an abstract method in sub class ( doSomethingUseful() ) is now a template method, which alows the sub classes of this subclass to do something useful what they think is useful or in other words you are allowing subclasses of this subclass to implement this template method as they want by using their own algorithm.
Now why whould you do that? answer is that you don't have access to the code of super class, otherwise you must have made this method abstract in super class in the first place.
Note that the code may not compile, I tried to come up with an exmple and did not pay attention to compiler demands.
I think I cleared my point, It was tough to explain though.
Good Luck.
Khawar.

Calling SAPSCRIPT from CLASS-METHOD?

Is it possible to call SAPSCRIPT from a class-method?
I have no idea how to use variables - there are no global variables in classes.
thx

Hi,
The super reference can only be used in redefined methods to call superclass implementation . So probably what you can do is use upcasting and access the required superclass implementation. I can think of only this way...;-)
Ex data lr_super type ref to cl_superclass
lr_super = lr_subclass.
lr_super->method().
~Piyush Patil

[XELLERATE.DATABASE] Class/Method: DirectDB/getConnection encounter some

[XELLERATE.DATABASE] Class/Method: DirectDB/getConnection encounter some problems: Error while retrieving database connection.Please check for the follwoing
ERROR [XELLERATE.DATABASE] Class/Method: tcDataBase/readPartialStatement encounter some problems: Got a null connection
java.sql.SQLException: Got a null connection
     at com.thortech.xl.dataaccess.tcDataBase.readPartialStatement(Unknown Source)
     at com.thortech.xl.dataobj.tcDataBase.readPartialStatement(Unknown Source)
     at com.thortech.xl.dataobj.tcDataBase.readStatement(Unknown Source)
     at com.thortech.xl.dataobj.tcDataBase.getError(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.handleError(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.handleError(Unknown Source)
     at com.thortech.xl.dataobj.tcUSR.createUser(Unknown Source)
     at com.thortech.xl.dataobj.tcREQ.selfRegisterUser(Unknown Source)
     at com.thortech.xl.dataobj.tcREQ.launchEntityDERActions(Unknown Source)
     at com.thortech.xl.dataobj.tcREQ.eventPostUpdate(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.update(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcTableDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.checkOrcTarget(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.eventPostUpdate(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.update(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcTableDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.setOrderContentItemStatus(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.setOrderContentItemStatus(Unknown Source)
     at com.thortech.xl.dataobj.tcScheduleItem.checkOrderContentItem(Unknown Source)
     at com.thortech.xl.dataobj.tcScheduleItem.eventPostUpdate(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.update(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.ejb.beansimpl.tcProvisioningOperationsBean.updateTask(Unknown Source)
     at com.thortech.xl.ejb.beansimpl.tcProvisioningOperationsBean.updateTask(Unknown Source)
     at com.thortech.xl.ejb.beans.tcProvisioningOperationsSession.updateTask(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
     at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:214)
     at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:149)
     at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:154)
     at org.jboss.webservice.server.ServiceEndpointInterceptor.invoke(ServiceEndpointInterceptor.java:54)
     at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
     at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106)
     at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
     at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166)
     at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:153)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
     at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:624)
     at org.jboss.ejb.Container.invoke(Container.java:873)
     at sun.reflect.GeneratedMethodAccessor114.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
     at org.jboss.invocation.local.LocalInvoker$MBeanServerAction.invoke(LocalInvoker.java:155)
     at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:104)
     at org.jboss.invocation.InvokerInterceptor.invokeLocal(InvokerInterceptor.java:179)
     at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:165)
     at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
     at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
     at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:97)
     at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
     at $Proxy325.updateTask(Unknown Source)
     at Thor.API.Operations.tcProvisioningOperationsClient.updateTask(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at Thor.API.Base.SecurityInvocationHandler$1.run(Unknown Source)
     at Thor.API.Security.LoginHandler.jbossLoginSession.runAs(Unknown Source)
     at Thor.API.Base.SecurityInvocationHandler.invoke(Unknown Source)
     at $Proxy782.updateTask(Unknown Source)
     at com.thortech.xl.webclient.actions.ApprovalsAction.approveDenyTasks(Unknown Source)
     at com.thortech.xl.webclient.actions.ApprovalsAction.confirmApprove(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
     at com.thortech.xl.webclient.actions.tcLookupDispatchAction.execute(Unknown Source)
     at com.thortech.xl.webclient.actions.tcActionBase.execute(Unknown Source)
     at com.thortech.xl.webclient.actions.tcAction.execute(Unknown Source)
     at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at com.thortech.xl.webclient.security.SecurityFilter.doFilter(Unknown Source)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
     at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     at java.lang.Thread.run(Thread.java:534)
*2008-11-18 15:33:43,175 ERROR [XELLERATE.SERVER] Class/Method: tcDataObj/handleError encounter some problems: {1}*
com.thortech.xl.orb.dataaccess.tcDataAccessException     at com.thortech.xl.dataaccess.tcDataAccessExceptionUtil.createException(Unknown Source)
     at com.thortech.xl.dataaccess.tcDataBase.createException(Unknown Source)
     at com.thortech.xl.dataaccess.tcDataBase.readPartialStatement(Unknown Source)
     at com.thortech.xl.dataobj.tcDataBase.readPartialStatement(Unknown Source)
     at com.thortech.xl.dataobj.tcDataBase.readStatement(Unknown Source)
     at com.thortech.xl.dataobj.tcDataBase.getError(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.handleError(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.handleError(Unknown Source)
     at com.thortech.xl.dataobj.tcUSR.createUser(Unknown Source)
     at com.thortech.xl.dataobj.tcREQ.selfRegisterUser(Unknown Source)
     at com.thortech.xl.dataobj.tcREQ.launchEntityDERActions(Unknown Source)
     at com.thortech.xl.dataobj.tcREQ.eventPostUpdate(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.update(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcTableDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.checkOrcTarget(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.eventPostUpdate(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.update(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcTableDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.setOrderContentItemStatus(Unknown Source)
     at com.thortech.xl.dataobj.tcORC.setOrderContentItemStatus(Unknown Source)
     at com.thortech.xl.dataobj.tcScheduleItem.checkOrderContentItem(Unknown Source)
     at com.thortech.xl.dataobj.tcScheduleItem.eventPostUpdate(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.update(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.ejb.beansimpl.tcProvisioningOperationsBean.updateTask(Unknown Source)
     at com.thortech.xl.ejb.beansimpl.tcProvisioningOperationsBean.updateTask(Unknown Source)
     at com.thortech.xl.ejb.beans.tcProvisioningOperationsSession.updateTask(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
     at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:214)
     at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:149)
     at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:154)
     at org.jboss.webservice.server.ServiceEndpointInterceptor.invoke(ServiceEndpointInterceptor.java:54)
     at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
     at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106)
     at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
     at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166)
     at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:153)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
     at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:624)
     at org.jboss.ejb.Container.invoke(Container.java:873)
     at sun.reflect.GeneratedMethodAccessor114.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
     at org.jboss.invocation.local.LocalInvoker$MBeanServerAction.invoke(LocalInvoker.java:155)
     at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:104)
     at org.jboss.invocation.InvokerInterceptor.invokeLocal(InvokerInterceptor.java:179)
     at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:165)
     at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
     at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
     at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:97)
     at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
     at $Proxy325.updateTask(Unknown Source)
     at Thor.API.Operations.tcProvisioningOperationsClient.updateTask(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at Thor.API.Base.SecurityInvocationHandler$1.run(Unknown Source)
     at Thor.API.Security.LoginHandler.jbossLoginSession.runAs(Unknown Source)
     at Thor.API.Base.SecurityInvocationHandler.invoke(Unknown Source)
     at $Proxy782.updateTask(Unknown Source)
     at com.thortech.xl.webclient.actions.ApprovalsAction.approveDenyTasks(Unknown Source)
     at com.thortech.xl.webclient.actions.ApprovalsAction.confirmApprove(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
     at com.thortech.xl.webclient.actions.tcLookupDispatchAction.execute(Unknown Source)
     at com.thortech.xl.webclient.actions.tcActionBase.execute(Unknown Source)
     at com.thortech.xl.webclient.actions.tcAction.execute(Unknown Source)
     at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at com.thortech.xl.webclient.security.SecurityFilter.doFilter(Unknown Source)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
     at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     at java.lang.Thread.run(Thread.java:534)
This is the error thrown when we are running the GTC Connector.
What might be the cause?Please suggest some sort of solution to this.
We are using GTC Connector to mass import the users from a FLAT FILE.
Thank you
Regards

Hi,
2008-11-19 13:52:36,446 ERROR [XELLERATE.SERVER] Class/Method: tcDataObj/save Error :Insertion of dataobject into database failed
2008-11-19 13:52:36,462 ERROR [XELLERATE.DATABASE] Class/Method: tcDataBase/rollbackTransaction encounter some problems: Rollback Executed From
java.lang.Exception: Rollback Executed From
     at com.thortech.xl.dataaccess.tcDataBase.rollbackTransaction(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.rollback(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.doRollback(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcTableDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcRCE.createUserRecord(Unknown Source)
     at com.thortech.xl.dataobj.tcRCE.applyActionRules(Unknown Source)
     at com.thortech.xl.dataobj.tcRCE.checkDataSorted(Unknown Source)
     at com.thortech.xl.dataobj.tcRCE.eventPostUpdate(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.update(Unknown Source)
     at com.thortech.xl.dataobj.tcDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcTableDataObj.save(Unknown Source)
     at com.thortech.xl.dataobj.tcRCE.finishDataReceived(Unknown Source)
     at com.thortech.xl.schedule.jms.reconOffline.ProcessOfflineReconMessages.finishReconciliationEvent(Unknown Source)
     at com.thortech.xl.schedule.jms.reconOffline.ProcessOfflineReconMessages.execute(Unknown Source)
     at com.thortech.xl.schedule.jms.messagehandler.MessageProcessUtil.processMessage(Unknown Source)
     at com.thortech.xl.schedule.jms.messagehandler.ReconMessageHandlerMDB.onMessage(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
     at org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:475)
     at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:149)
     at org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:101)
     at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48)
     at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106)
     at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
     at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166)
     at org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:94)
     at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192)
     at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
     at org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:389)
     at org.jboss.ejb.Container.invoke(Container.java:873)
     at org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:1077)
     at org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1379)
     at org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:256)
     at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904)
     at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:160)
     at org.jboss.mq.SpySession.run(SpySession.java:333)
     at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180)
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
     at java.lang.Thread.run(Thread.java:534)
2008-11-19 13:52:36,462 ERROR [XELLERATE.SERVER] Class/Method: tcDataObj/save Error :Wrong SQL operation for save
2008-11-19 13:52:36,462 WARN [XELLERATE.DATABASE] Trying to get the connection count : 0
2008-11-19 13:52:36,462 WARN [XELLERATE.DATABASE] Trying to get the connection count : 1
2008-11-19 13:52:36,462 WARN [XELLERATE.DATABASE] Trying to get the connection count : 2
2008-11-19 13:52:36,462 WARN [XELLERATE.DATABASE] Trying to get the connection count : 3
2008-11-19 13:52:36,462 WARN [XELLERATE.DATABASE] Trying to get the connection count : 4
2008-11-19 13:52:36,462 ERROR [XELLERATE.DATABASE] Class/Method: DirectDB/getConnection encounter some problems: Error while retrieving database connection.Please check for the follwoing
Database srever is running.
Datasource configuration settings are correct.
2008-11-19 13:52:36,462 ERROR [XELLERATE.DA.
TABASE] Class/Method: tcDataBase/readPartialStatement encounter some problems: Got a null connection
java.sql.SQLException: Got a null connection
I got the above said error also.
when u encountered this kind of problem ,how u resloved the issue.
Thanks,

Calling up class methods

I suffer problems understanding how to call up class methods from within my programs and would like to see further examples of coding and a lending hand with the problem below, program one ProductClass works out stock item lines of a product, the program then needs to ask for the StaticProduct Class(the second program attached) to check for a valid barcode length and for how many odds and even numbers are within it a valid barcode would be 5000127062092
I would very much appreciate some help:
* This is a program to Enter and check product codes and prices
* and give a summary of values at the end
* @author (Jeffrey Jones)
* @version (version 2 5th April 2003)
public class ProcessProduct
public static void main(String args[])
StaticProduct Product = new StaticProduct();
//declare variables
String manuf;
String name;
int sLength;
String p;
String barcode;
int price;
int quantity;
int totalPrice=0;
int transactions=1;
int totalQuantity=0;
int totalValue=0;
int averageCost=0;
//Input Details
System.out.print("Enter Product Manufacturer : ");
manuf = UserInput.readString();
//start of while loop checking for 0 to exit loop
while (!manuf.equals("0"))
System.out.print("Enter Product Name : ");
name = UserInput.readString();
System.out.print("Enter Bar Code : ");
barcode = UserInput.readString();
//check for invalid data
if (StaticProduct.isValidBarcode(barcode))
{barcode = new code();
p = new Product("manuf","name","quantity","price");
}//closing bracket of if
else
{//error handling
}//closing bracket of if
//check for quantity input and errors
System.out.print("Enter Quantity : ");
quantity = UserInput.readInt();
if (quantity<=0)
{ System.out.print(" Error, invalid value ");
System.exit(0);
}// check for invalid entries
System.out.print("Enter Price :");
price = UserInput.readInt();
//check for price input and errors
if (price<=0)
{ System.out.print(" Error, invalid value ");
}// check for invalid entries
//total price value
totalPrice=price*quantity;
//Output of correctly inputted data
System.out.println(manuf+":"+name+":"+barcode+":"+price);
System.out.println(quantity+" @ "+price+" = "+totalPrice);
//update variables quantities
//update total quantity
totalQuantity = (totalQuantity + quantity);
//keep count of total value
totalValue = (totalValue + totalPrice);
//keep count of totqal no of transactions
transactions = (transactions++);
//Input Details
System.out.print("Enter Product Manufacturer : ");
manuf = UserInput.readString();
}//closure of loop
//display final totals
System.out.println("Transactions: "+transactions);
System.out.println("Total quantity: "+totalQuantity);
System.out.println("Total value: "+totalValue);
System.out.println("Average Cost: "+totalValue/totalQuantity);
System.exit(0);
}//closing bracket input and output of data
}//end class
* Write a description of class StaticProduct here.
* @author Jeffrey Jones
* @version 1 1st April 2003
public class StaticProduct
* isValidBarcode method - to check for correct barcode and length
* @return boolean
public static boolean isValidBarcode(String barcode) {
barcode = new barcode();
// validateBarcode length
if ( barcode.length() != 13 ) {
System.out.println("Invalid barcode " + barcode + " not 13 characters");
return false;
}//if
for ( int i = 0; i < barcode.length(); i++ ){// Check every char a digit
if ( ! Character.isDigit( barcode.charAt(i) ) ){
System.out.println("Invalid barcode " + barcode + " not all digits");
return false;
}//if
}//endfor
int sum1 = 0; // Sum first + third + etc.
for ( int i = 0; i < barcode.length() - 1; i += 2 ){
sum1 += barcode.charAt(i) - '0';
}//endfor
int sum2 = 0; // Sum second + fourth + etc.
for ( int i = 1; i < barcode.length() - 1; i += 2 ){
sum2 += barcode.charAt(i) - '0';
}//endfor
int check = sum1 + 3 * sum2; // 1st sum + three times 2nd sum.
check = check % 10; // Remainder on division by 10.
if ( check != 0 ){
check = 10 - check;
}//endif
if (check != barcode.charAt(12) - '0'){
System.out.println("Invalid barcode " + barcode + " check digit error");
}//endif
return ( check == barcode.charAt(12) - '0' );
}//end isValidBarcode
public static void main(String[] argv) {
System.out.println(isValidBarcode("1234567890123"));
System.out.println(isValidBarcode("123"));
System.out.println(isValidBarcode(""));
System.out.println(isValidBarcode("5018374496652"));
}//end main
}//end class

Read through your text book or some java tutorials from this site to understand what classes are, what are methods, etc.
Your program is full of wrong initializations (as you rightly said you dont understand how to call up class method I would add that you dont understand how to call classes and what do they return e.g.
You have declared
String p;
then you go ahead and do this
p = new Product("manuf","name","quantity","price"); This is syntax for calling a class is this class returning a String? :s
Please go through the basics of Object Oriented Programming and then start with the coding part else you will face such very many difficulties and waste more time of yours in just coding with no results.
Look for the tutorials on this site and read through them and do example as given in them.

API Classes & Methods - Book / Websites / References / Pointers ?

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