Reading from java.io.ByteArrayInputStream
Hi,
I have java.io.ByteArrayInputStream buffer with bytes and I need to read from it and direct bytes into OutputStream. So, what is more effective:
- read one by one bytes from this stream using read() method and write each byte in OutputStream
or
- use int read(byte b[], int off, int len) method which use native array copy System.arraycopy(buf, pos, b, off, len);
What do you think?
So, If I will use the second approach, what size of byte array, which is the first param in read method, must be?
As I see, the class java.io.ByteArrayInputStream dosen't have method size() and I can't know the size of the buffer in order to use it as array size.
Give it any size you want.
Then use
read(buf, 0, bufsize);
So what size should you want? Well, how long is the data likely to be,
and how many reads would you like to make.
Hint: somewhere between 128 bytes and 4096 bytes is probably fine.
Similar Messages
-
Hi everybody!
Can anyone tell me, how I can call the Acrobat Reader from Java, open a pdf-document and make a snapshot fo the first page?
I have to create an Image file of a page of a pdf-file.
I already tried pdfbox and iText, both do not work.
So using Acrobat seems to be the best solution, from my point of view.
Any suggestions?
Thx in Advance!
StefJeah, I did, but nothing usefull there.
Perhaps it is possible to open a pdf and save a sanpashot of one page as an image using commandline or jscript?
Any hints, ides?
Greetings
Stef -
Unable to read from Java MQ Queue in Unix
Hi,
I developed a small application that uses a scheduler as an input to a jcd. Once invoked, the jcd reads from a Java MQ queue and writes the result to the log.
I developed the application on CAPS 6 in Solaris 10.
We are however unable to read from the queue in Unix. The code returns an empty queue, even though the queue does have messages in it. Below is the code in the jcd used to read from the queue:
int recCount = 0;
+while (true) {+
com.stc.connectors.jms.Message txtMsg = JMS_1.receiveNoWait();
+// break out of loop, if no more messages+
+if (txtMsg == null) {+
logger.info( "Record Count is :: " recCount );+
break;
+}+
recCount+;+
+}+
The same project, imported into CAPS 6 on a Windows platform, works without issue.
Has anyone experienced compatability issues like this with Java MQ between Windows and Unix?
AdtThis is probably coz of the JMS header.
Try setting MQJMS_CLIENT_NONJMS_MQ as the target client and also try retrieving the message as ByteStream rather than TextMessage. -
Where to place text file in Jdeveloper9irc to read from Java program
For ex.
package mypackage;
import java.io.*;
public class ReadData
public ReadData()
public static void main(String[] args)
new ReadData();
try{
File fin = new File("test.txt");
if (fin.canRead())
System.out.println("Can read file");
I am geting a error message of file not found. Please advise
in which directory should I place the text file "test.txt" so that the java program can read from it.
Thanks,
agspThe test.txt file should be in the 'Run Directory" of your Project. Select Project.jpr and invoke Project settings dialog.
Click on the Runner. You will see the "Run Directory" edit field.
For ex.
package mypackage;
import java.io.*;
public class ReadData
public ReadData()
public static void main(String[] args)
new ReadData();
try{
File fin = new File("test.txt");
if (fin.canRead())
System.out.println("Can read file");
I am geting a error message of file not found. Please advise
in which directory should I place the text file "test.txt" so that the java program can read from it.
Thanks,
agsp -
Reading from java.nio.SocketChannel
Hi guys,
can anyone tell me how can i read from a SocketChannel a certain number of bytes instead reading whole buffer.
The only method that i find is to have multiple ByteBuffer and allocate them the number of bytes that i want to read.
Ex.
An client send me 20 bytes.
I want to read 1 first , 9 second and last the rest.
i do something like that :
ByteBuffer b1 = ByteBuffer.allocate(1);
ByteBuffer b2 = ByteBuffer.allocate(9);
ByteBuffer b3 = ByteBuffer.allocate(10);and then read in eatch buffer.
Is there another way to read using only one buffer .
Thank's
DannyThe main idea behind buffers is max reuse of objects (therefore minimal calls to the Garbage Collector). You should only need one for reading.
When reading from a SocketChannel, it just fills up whatever buffer you give it as full as it can. (Could be one byte, could be a million, doesn't matter, don't be concerned) Then, you can just flip the buffer, read the data to wherever, reset it and it's good to go again. If you find yourself concerned with how many bytes you've read (unless you want to explicitly keep track for some reason like display purposes), you are immediately on the wrong path, as the SocketChannel/Buffer combination will take care of this for you. -
How to get return value from java and read by other application?
i want to read return value from java and the other application read it.
for example:
public class test_return {
test_return(){
public int check(){
return 1;
public static void main(String args[]){
new test_return().check();
}from that class i make as jar file. How to read the return value (1) by other application?
thx..If your installer is requiring some process it invokes to return a particular value on failure, then the installer is seriously broken. There are a bazillion commands your installer could invoke, and any of them could fail, which in turn could invalidate the entire install process, and any of them could return any value on failure. The only value that's consistent (in my experience) is that zero means success and non-zero means failure, with specific non-zero values being different in different programs.
About the only control you have over the JVM's exit code is that if your main method completes without throwing an exception, the JVM will have an exit code of 0, and if main throws an exception (either explicitly or by not catching one thrown from below), it will be non-zero. I'm not even sure if that's guaranteed, but I would guess that's the case.
EDIT: I'm kind of full of crap here. If you're writing the Java code, you can call System.exit(whatever). But nonetheless, if your installer requires certain exit codes from any app--java or otherwise--you have a problem.
Edited by: jverd on Oct 29, 2009 1:27 AM -
Java - Write And Read From memory Like CheatEngine ( Writing not working?)
Hello Oracle Forum
I came here some time ago to ask about javaFX , i solved all my issues and im right now waiting for javaFx tot ake over swing and hmm, im working on learning LIBGDX to create games in java.
However, im in need to create an app to change values of memory to fix a bug in an old program that i have, and the only way until now is using cheatEngine, So i decided to take a tutorial and learn how to do that in java.
Well, im able to read from the memory but the write isnt working somehow... Im posting the code here, if anyone can give me a hint, i would thank and a lot, because theres a community that really needs this app to automate the fix without using cheat engine.
package MainStart;
import com.br.HM.User32;
import com.br.kernel.Kernel32;
import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.ptr.IntByReference;
public class Cheater {
static Kernel32 kernel32 = (Kernel32) Native.loadLibrary("kernel32", Kernel32.class);
static User32 user32 = (User32) Native.loadLibrary("user32", User32.class);
static int readRight = 0x0010;
static int writeRight = 0x0020;
//static int PROCESS_VM_OPERATION = 0x0008;
public static void main(String[] args) {
//Read Memory
//MineSweeper = Campo Minado
int pid = getProcessId("Campo Minado"); // get our process ID
System.out.println("Pid = " + pid);
Pointer readprocess = openProcess(readRight, pid); // open the process ID with read priviledges.
Pointer writeprocess = openProcess(writeRight, pid);
int size = 4; // we want to read 4 bytes
int address = 0x004053C8;
//Read Memory
Memory read = readMemory(readprocess, address, size); // read 4 bytes of memory starting at the address 0x00AB0C62.
System.out.println(read.getInt(0)); // print out the value!
//Write Memory
int writeMemory = writeMemory(writeprocess, address, new short[0x22222222]);
System.out.println("WriteMemory :" + writeMemory);
Memory readM = readMemory(readprocess, address, size);
System.out.println(readM.getInt(0));
public static int writeMemory(Pointer process, int address, short[] data) {
IntByReference written = new IntByReference(0);
Memory toWrite = new Memory(data.length);
for (long i = 0; i < data.length; i++) {
toWrite.setShort(0, data[new Integer(Long.toString(i))]);
boolean b = kernel32.WriteProcessMemory(process, address, toWrite, data.length, written);
System.out.println("kernel32.WriteProcessMemory : " + b); // Retorna false
return written.getValue();
public static Pointer openProcess(int permissions, int pid) {
Pointer process = kernel32.OpenProcess(permissions, true, pid);
return process;
public static int getProcessId(String window) {
IntByReference pid = new IntByReference(0);
user32.GetWindowThreadProcessId(user32.FindWindowA(null, window), pid);
return pid.getValue();
public static Memory readMemory(Pointer process, int address, int bytesToRead) {
IntByReference read = new IntByReference(0);
Memory output = new Memory(bytesToRead);
kernel32.ReadProcessMemory(process, address, output, bytesToRead, read);
return output;
package com.br.HM;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.platform.win32.WinDef.RECT;
import com.sun.jna.ptr.ByteByReference;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.win32.StdCallLibrary.StdCallCallback;
import com.sun.jna.win32.W32APIOptions;
* Provides access to the w32 user32 library. Incomplete implementation to
* support demos.
* @author Todd Fast, [email protected]
* @author [email protected]
public interface User32 extends W32APIOptions {
User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class, DEFAULT_OPTIONS);
Pointer GetDC(Pointer hWnd);
int ReleaseDC(Pointer hWnd, Pointer hDC);
int FLASHW_STOP = 0;
int FLASHW_CAPTION = 1;
int FLASHW_TRAY = 2;
int FLASHW_ALL = (FLASHW_CAPTION | FLASHW_TRAY);
int FLASHW_TIMER = 4;
int FLASHW_TIMERNOFG = 12;
public static class FLASHWINFO extends Structure {
public int cbSize;
public Pointer hWnd;
public int dwFlags;
public int uCount;
public int dwTimeout;
int IMAGE_BITMAP = 0;
int IMAGE_ICON = 1;
int IMAGE_CURSOR = 2;
int IMAGE_ENHMETAFILE = 3;
int LR_DEFAULTCOLOR = 0x0000;
int LR_MONOCHROME = 0x0001;
int LR_COLOR = 0x0002;
int LR_COPYRETURNORG = 0x0004;
int LR_COPYDELETEORG = 0x0008;
int LR_LOADFROMFILE = 0x0010;
int LR_LOADTRANSPARENT = 0x0020;
int LR_DEFAULTSIZE = 0x0040;
int LR_VGACOLOR = 0x0080;
int LR_LOADMAP3DCOLORS = 0x1000;
int LR_CREATEDIBSECTION = 0x2000;
int LR_COPYFROMRESOURCE = 0x4000;
int LR_SHARED = 0x8000;
Pointer FindWindowA(String winClass, String title);
int GetClassName(Pointer hWnd, byte[] lpClassName, int nMaxCount);
public static class GUITHREADINFO extends Structure {
public int cbSize = size();
public int flags;
Pointer hwndActive;
Pointer hwndFocus;
Pointer hwndCapture;
Pointer hwndMenuOwner;
Pointer hwndMoveSize;
Pointer hwndCaret;
RECT rcCaret;
boolean GetGUIThreadInfo(int idThread, GUITHREADINFO lpgui);
public static class WINDOWINFO extends Structure {
public int cbSize = size();
public RECT rcWindow;
public RECT rcClient;
public int dwStyle;
public int dwExStyle;
public int dwWindowStatus;
public int cxWindowBorders;
public int cyWindowBorders;
public short atomWindowType;
public short wCreatorVersion;
boolean GetWindowInfo(Pointer hWnd, WINDOWINFO pwi);
boolean GetWindowRect(Pointer hWnd, RECT rect);
int GetWindowText(Pointer hWnd, byte[] lpString, int nMaxCount);
int GetWindowTextLength(Pointer hWnd);
int GetWindowModuleFileName(Pointer hWnd, byte[] lpszFileName, int cchFileNameMax);
int GetWindowThreadProcessId(Pointer hWnd, IntByReference lpdwProcessId);
interface WNDENUMPROC extends StdCallCallback {
* Return whether to continue enumeration.
boolean callback(Pointer hWnd, Pointer data);
boolean EnumWindows(WNDENUMPROC lpEnumFunc, Pointer data);
boolean EnumThreadWindows(int dwThreadId, WNDENUMPROC lpEnumFunc, Pointer data);
boolean FlashWindowEx(FLASHWINFO info);
Pointer LoadIcon(Pointer hInstance, String iconName);
Pointer LoadImage(Pointer hinst, // handle to instance
String name, // image to load
int type, // image type
int xDesired, // desired width
int yDesired, // desired height
int load // load options
boolean DestroyIcon(Pointer hicon);
int GWL_EXSTYLE = -20;
int GWL_STYLE = -16;
int GWL_WNDPROC = -4;
int GWL_HINSTANCE = -6;
int GWL_ID = -12;
int GWL_USERDATA = -21;
int DWL_DLGPROC = 4;
int DWL_MSGRESULT = 0;
int DWL_USER = 8;
int WS_EX_COMPOSITED = 0x20000000;
int WS_EX_LAYERED = 0x80000;
int WS_EX_TRANSPARENT = 32;
int GetWindowLong(Pointer hWnd, int nIndex);
int SetWindowLong(Pointer hWnd, int nIndex, int dwNewLong);
int LWA_COLORKEY = 1;
int LWA_ALPHA = 2;
int ULW_COLORKEY = 1;
int ULW_ALPHA = 2;
int ULW_OPAQUE = 4;
boolean SetLayeredWindowAttributes(Pointer hwnd, int crKey,
byte bAlpha, int dwFlags);
boolean GetLayeredWindowAttributes(Pointer hwnd,
IntByReference pcrKey,
ByteByReference pbAlpha,
IntByReference pdwFlags);
* Defines the x- and y-coordinates of a point.
public static class POINT extends Structure {
public int x, y;
* Specifies the width and height of a rectangle.
public static class SIZE extends Structure {
public int cx, cy;
int AC_SRC_OVER = 0x00;
int AC_SRC_ALPHA = 0x01;
int AC_SRC_NO_PREMULT_ALPHA = 0x01;
int AC_SRC_NO_ALPHA = 0x02;
public static class BLENDFUNCTION extends Structure {
public byte BlendOp = AC_SRC_OVER; // only valid value
public byte BlendFlags = 0; // only valid value
public byte SourceConstantAlpha;
public byte AlphaFormat;
boolean UpdateLayeredWindow(Pointer hwnd, Pointer hdcDst,
POINT pptDst, SIZE psize,
Pointer hdcSrc, POINT pptSrc, int crKey,
BLENDFUNCTION pblend, int dwFlags);
int SetWindowRgn(Pointer hWnd, Pointer hRgn, boolean bRedraw);
int VK_SHIFT = 16;
int VK_LSHIFT = 0xA0;
int VK_RSHIFT = 0xA1;
int VK_CONTROL = 17;
int VK_LCONTROL = 0xA2;
int VK_RCONTROL = 0xA3;
int VK_MENU = 18;
int VK_LMENU = 0xA4;
int VK_RMENU = 0xA5;
boolean GetKeyboardState(byte[] state);
short GetAsyncKeyState(int vKey);
package com.br.kernel;
import com.sun.jna.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.ptr.IntByReference;
// by deject3d
public interface Kernel32 extends StdCallLibrary
// description from msdn
//BOOL WINAPI WriteProcessMemory(
//__in HANDLE hProcess,
//__in LPVOID lpBaseAddress,
//__in LPCVOID lpBuffer,
//__in SIZE_T nSize,
//__out SIZE_T *lpNumberOfBytesWritten
boolean WriteProcessMemory(Pointer p, int address, Pointer buffer, int size, IntByReference written);
//BOOL WINAPI ReadProcessMemory(
// __in HANDLE hProcess,
// __in LPCVOID lpBaseAddress,
// __out LPVOID lpBuffer,
// __in SIZE_T nSize,
// __out SIZE_T *lpNumberOfBytesRead
boolean ReadProcessMemory(Pointer hProcess, int inBaseAddress, Pointer outputBuffer, int nSize, IntByReference outNumberOfBytesRead);
//HANDLE WINAPI OpenProcess(
// __in DWORD dwDesiredAccess,
// __in BOOL bInheritHandle,
// __in DWORD dwProcessId
Pointer OpenProcess(int desired, boolean inherit, int pid);
/* derp */
int GetLastError();
http://pastebin.com/Vq8wfy39Hello there,
this tutorial was exactly what I needed, so thank you.
Your problem seems to be in this line:
int writeMemory = writeMemory(writeprocess, address, new short[0x22222222]);
The problem is, you're creating a new short array with the length of 0x22222222. Which not only results in an java.lang.OutOfMemoryError: Java heap space
but also, if it would work, would create an empty array with the length of 0x22222222.
I think you want to write 0x22222222 as value in your address.
Correctly stored the code you'd need to write would be:
short[] sarray = new short[]{(short) 0x22222222};
But because the value is too long for the short, the value stored in your array would be the number 8738.
I think, what you want to do is to store the number 572662306, which would be the hex value, stored in an int variable.
So first of all you need to strip down your hex-value to shorts:
Short in Java uses 16 Bit = 2 Byte. 0x22222222 -> 0x2222 for your high byte and 0x2222 for your low byte
So your array would be
short[] sarray = new short[]{0x2222,0x2222};//notice, that sarray[0] is the lowbyte and sarray[1] the high byte, if you want to store 20 it would be new short[]{20,0} or if you use hex new short[]{0x14,0x00}
The next part is your writeToMemory Method. If I'm right, the method in the tutorial is a little bit wrong. The right version should be this:
public static int writeMemory(Pointer process, int address, short[] data) {
IntByReference written = new IntByReference(0);
int size = data.length*Short.SIZE/8;
Memory toWrite = new Memory(size);
for (int i = 0; i < data.length; i++) {
toWrite.setShort(i*Short.SIZE/8,
data[i]);
boolean b = kernel32.WriteProcessMemory(process, address, toWrite,
size, written);
return written.getValue();
You need to calculate your offset right. And the size of your memory. Maybe you could write this method not with shorts, but with integers. But this should work.
If you pass your new array to this function, it should write 0x22222222 to your adress. If you read out your toWrite value with toWrite.getInt(0) you get the right value.
And there is one more thing. In order to write data to a process, you need to grant two access rights:
A handle to the process memory to be modified. The handle must have PROCESS_VM_WRITE and PROCESS_VM_OPERATION access to the process.
You have to grant the right to write data: PROCESS_VM_WRITE: 0x0020 and PROCESS_VM_OPERATION: 0x0008
So your writeProcess needs to get initialized this way:
Pointer writeprocess = openProcess(0x0020|0x0008,pid);
I hope this works for you. Let me know.
Greetings
Edit:
Because every data you write will be 1 byte to whatever count of byte I think the best way is to use the following method to write data to the memory:
public static void writeMemory(Pointer process, long address, byte[] data)
int size = data.length;
Memory toWrite = new Memory(size);
for(int i = 0; i < size; i++)
toWrite.setByte(i, data[i]);
boolean b = kernel32.WriteProcessMemory(process, address, toWrite, size, null);
You can see some changes. First I changed all address values from int to long, because some addresses are out of range. And with all, i mean all. Not only in writeMemory, but also in readMemory and in your kernel32 Class.
Second I don't use the IntByReference anymore..
To use this method you need to store your data the following way if you would write 4 Byte data:
byte[] values = new byte[]{0x14,0x00,0x00,0x00};
This value would be the number 20. Index 0 will be the lowest byte and index 3 will be the highest byte.
And one more thing I wrote is an method which you can use to calculate your address if you have a baseAddress.
If you restart your program/game your old addresses won't point at the same values of your game. With some research (I use CheatEngine) you can get the baseaddress. This one will alway be the same.
To get from your baseaddress to the dynamic adress you use offsets.
public static long findDynAddy(Pointer process, int[] offsets, long baseAddress)
long pointer = baseAddress;
int size = 4;
Memory pTemp = new Memory(size);
long pointerAddress = 0;
for(int i = 0; i < offsets.length; i++)
if(i == 0)
kernel32.ReadProcessMemory(process, pointer, pTemp, size, null);
pointerAddress = ((pTemp.getInt(0)+offsets[i]));
if(i != offsets.length-1)
kernel32.ReadProcessMemory(process, pointerAddress, pTemp, size, null);
return pointerAddress;
This methods gets a process, an array of offsets (hex-values) and your baseadress and returns the dynamic address.
For Solitaire the following code would give you the address to the score:
long baseAddr = 0x10002AFA8L;
int[] offsets = new int[]{0x50,0x14};
long addr = findDynAddy(process, offsets, baseAddr);
If somebody wants to get the whole code (user32, kernel32 and the cheater) just pm me and I will give you a link. -
Java Heap Space error while reading from Excel
Hello,
I have a data flow which reads from excel and updates records in an oracle table.
When the data flow tries to read the excel I get a java Heap space Error.
Error preparing to read <SUPP_STG3_FILE1>: <Java heap space>.
Data flow <DF_SUPP_STG3_UPD> is terminated due to error <58105>.
I have configured Excel Adapter since the server is on UNIX. BOExcelAdapter shows status as red once the execution fails. Before that BOExcel adapter status is green.
BOExcelAdapter Trace:
1/13/12 10:57:38 PM Thread[Thread-6,5,main] Received an error message from the message broker. [Communication failure. Read timed out]. Will exit adapter immediately.
1/13/12 10:57:47 PM Thread[main,5,main] Create broker client for life-cycle management. Host:port = hikalxboes01:4001
1/13/12 10:57:47 PM Thread[main,5,main] Create broker client for data exchange with ASP. Host:port = hikalxboes01:4001. Client ID = com.acta.adapter.msexceladapter.MSExcelAdapter.data_18
1/13/12 10:57:47 PM Thread[Thread-11,5,main] Create broker client for real-time services with ASP. Host:port = 'hikalxboes01:4000''.
1/13/12 10:57:47 PM Thread[Thread-11,5,main] Start instance [BOExcelAdapter] of adapter [com.acta.adapter.msexceladapter.MSExcelAdapter].
1/13/12 10:57:47 PM Thread[Thread-11,5,main] Register the client ID [com.acta.adapter.msexceladapter.MSExcelAdapter.data_18] and adapter destination [hikalxboes01:4001] with the adapter manager.
1/13/12 10:57:47 PM Thread[Thread-11,5,main] Registration complete.
1/13/12 10:58:10 PM Thread[Thread-10,5,main] java.lang.OutOfMemoryError: Java heap space
at org.apache.poi.hssf.usermodel.HSSFRow.addCell(HSSFRow.java:273)
at org.apache.poi.hssf.usermodel.HSSFRow.createCellFromRecord(HSSFRow.java:196)
at org.apache.poi.hssf.usermodel.HSSFSheet.setPropertiesFromSheet(HSSFSheet.java:183)
at org.apache.poi.hssf.usermodel.HSSFSheet.<init>(HSSFSheet.java:128)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:283)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:196)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:178)
at com.acta.adapter.msexceladapter.MSExcelAdapterReadTable.begin(MSExcelAdapterReadTable.java:537)
at com.acta.adapter.sdk.StreamOperationWrapper.beginStream(StreamOperationWrapper.java:88)
at com.acta.adapter.sdk.AdapterRunnerImpl.processBeginOperation(AdapterRunnerImpl.java:1762)
at com.acta.adapter.sdk.AdapterServiceDataListener.handleBrokerMessage(AdapterServiceDataListener.java:90)
at com.acta.brokerclient.BrokerClient.handleMessage(BrokerClient.java:439)
at com.acta.brokerclient.BrokerClient.access$100(BrokerClient.java:53)
at com.acta.brokerclient.BrokerClient$MessageHandler.run(BrokerClient.java:1621)
at com.acta.brokerclient.ThreadPool$PoolThread.run(ThreadPool.java:100)
BOExcelAdapter Error Log:
1/13/12 10:58:10 PM java.lang.OutOfMemoryError: Java heap space
at org.apache.poi.hssf.usermodel.HSSFRow.addCell(HSSFRow.java:273)
at org.apache.poi.hssf.usermodel.HSSFRow.createCellFromRecord(HSSFRow.java:196)
at org.apache.poi.hssf.usermodel.HSSFSheet.setPropertiesFromSheet(HSSFSheet.java:183)
at org.apache.poi.hssf.usermodel.HSSFSheet.<init>(HSSFSheet.java:128)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:283)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:196)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:178)
at com.acta.adapter.msexceladapter.MSExcelAdapterReadTable.begin(MSExcelAdapterReadTable.java:537)
at com.acta.adapter.sdk.StreamOperationWrapper.beginStream(StreamOperationWrapper.java:88)
at com.acta.adapter.sdk.AdapterRunnerImpl.processBeginOperation(AdapterRunnerImpl.java:1762)
at com.acta.adapter.sdk.AdapterServiceDataListener.handleBrokerMessage(AdapterServiceDataListener.java:90)
at com.acta.brokerclient.BrokerClient.handleMessage(BrokerClient.java:439)
at com.acta.brokerclient.BrokerClient.access$100(BrokerClient.java:53)
at com.acta.brokerclient.BrokerClient$MessageHandler.run(BrokerClient.java:1621)
at com.acta.brokerclient.ThreadPool$PoolThread.run(ThreadPool.java:100)As Jay mentioned above it might be due to the size of the Excel spreadsheet as you might be hitting the limitation in Apache POI library used for adapter.
What is the size of the Excel file?
What is the value of -Xmx parameter - see DS Management Console > Adapter configuration page.
Thank you,
Viacheslav. -
Reading XML file from java web service
Hi
I am developing web service using Netbeans and the application server is glassfish.
but I am facing a problem
I have folder called "config" which will include the xml files. What I need to do setting path into that folder
but it will read from another location when I am deploying it
How to set our own path ?
Error
DPL5306:Servlet Web Service Endpoint [NewWebService] listening at address [http://kapila.epic.lk:8080/WebApplication2/NewWebServiceService]
deployed with moduleid = WebApplication2
java.io.FileNotFoundException: /root/MyWorks/glassfish-v2/domains/domain1/config/OSconfig/MConfig.xml (No such file or directory)
at java.io.FileInputStream.open(Native Method)
My "conifg" folder, i have put in to working directory but it will read from "/root/MyWorks/glassfish-v2/domains/domain1/config/OSconfig/MConfig.xm"
below method is used for getting its contain value
public String getMainCofig() {
String v ="";
try{
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse(new File("OSconfig/MConfig.xml"));
doc.getDocumentElement().normalize();
NodeList listOfSPRMs = doc.getElementsByTagName("MainConfig");
Node firstSPRMNode = listOfSPRMs.item(0);
if (firstSPRMNode.getNodeType() == Node.ELEMENT_NODE) {
Element firstSPRAMElement = (Element) firstSPRMNode;
// Getting platform
NodeList server_port = firstSPRAMElement
.getElementsByTagName("RunningPlatform");
Element server_port_el = (Element) server_port.item(0);
NodeList server_port_List = server_port_el.getChildNodes();
v= ((Node) server_port_List.item(0))
.getNodeValue().trim();
}catch (Exception e){
e.printStackTrace();
return v;
Regards
I didn't quite get what the problem is but if the the desired file is in custom directory why don't you just use absolute path to reference it?
Like: "/home/my/OSconfig/MConfig.xml" -
How to Read a CAB File from JAVA?
Hi,
Anyone knows how to read a CAB File from java. I need to read a property file of txt file that is packaged in CAB file & then based on that, I have to do processing. Is there anyway to do it.
I had tried using java.util.zip.ZipFile Class, but it does work for JAR, but not for CAB.
siva.Perhaps there's something in the Cabinet SDK that will help:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncabsdk/html/cabdl.asp -
Java.sql.SQLException: No more data to read from socket
Hello,
we're now facing some strange problem which is probably caused by some malfunctioned connections being present in connection pool. The MGP process is failing for some clients with following error message. During the MGP process, some users are processed without any problems and some encounter this exception. I tried to restart the DB and both OL servers (we have 2 OL servers, on one of them is running MGP), but it didn't help.
Some time before I restarted the servers, we were also occasionally facing "Server connections exceeded" error message, but I don't think this is relevant...
We're using 10gR2 OL servers and 10gR2 RDBMS.
Any ideas what could be wrong?
<pre>
Applied Record Counts:
Insert Count = 0
Update Count = 0
Delete Count = 0
Composed PubItems
(<PubItem Name>, <Duration in Milli Seconds>):
JPOCZ_C$ALL_CLIENTS,16
JPOCZ_PA_STATESTOCKSUM,1484
JPOCZ_PA_MEMOS,31
JPOCZ_TASKMOTYPES,47
JPOCZ_PA_VISITDETAILS,16
JPOCZ_PA_STATESTOCK,859
JPOCZ_DISTRIBS,47
JPOCZ_ITEMPRICING,438
Compose Error:
java.sql.SQLException: No more data to read from socket
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:189)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:231)
at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:985)
at oracle.jdbc.ttc7.MAREngine.unmarshalUB1(MAREngine.java:746)
at oracle.jdbc.ttc7.MAREngine.unmarshalSB1(MAREngine.java:705)
at oracle.jdbc.ttc7.Ocommoncall.receive(Ocommoncall.java:108)
at oracle.jdbc.ttc7.TTC7Protocol.rollback(TTC7Protocol.java:427)
at oracle.jdbc.driver.OracleConnection.rollback(OracleConnection.java:1410)
at oracle.lite.sync.JupConnection.rollback(Unknown Source)
at oracle.lite.sync.MGP$MGPG.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
</pre>I'm not using localhost, but the host name. We just today notified some other network problems on this server and discovered there're 2 network cards - one of them which wasn't connected was configured for DHCP and the other one was configured properly with fixed IP address. We disabled the disconnected network card and it looks like the problems with other applications is solved so we'll se if the Mobile Server is also cured...
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Couldn't read from socket error: Is this a bug in Java?
I have been facing this grave problem for a long time now. After establishing a socket connection with some server:port say 207.123.17.20:1865, I get this error "Couldn't read from socket" as an IOException. I can neither read or send any packets to the server after receiving this error. On checking whether the socket connection is alive or not, I print socket.getAddress() and it returns me the ip of the server to which it is connected. The specification says that receiving this error means the socket was closed by the server. If it so then how I am able to print the server address after receiving this error? How can I get around this problem? Plz. help...
watertownjordan said:
If your computer (client) killed the connection, it should throw an error >pointing to the OS closing the connection. but what if my client app cntrl alt del while the server is waiting to here from the client.
my client may sit idle for hours and then contact again. i want to keep their socket connected but if they cntrl alt del then i want to close the socket so the thread on the server side can be exited.
the way i solved this was to send an "i'm still here" message to the serv in a timer every 10 seconds and set the time out on the server side to 30 seconds.
i used a syncronized boolean variable like so:
volatile private boolean out1busy = false;
private synchronized boolean getOut1busy(){
return out1busy;
private synchronized void setOut1busy(boolean on){
out1busy = on;
}then in the timer i do this
while (getOut1busy()) try { Thread.sleep(40); } catch (InterruptedException ex) {}
setOut1busy(true);
lobbyOut.println("-1");
setOut1busy(false);it seems to work fine but the loop using the thread.sleep does not seem right and i know very little about this all.
i'm basically asking the same thing as Chintan.Kanal
Is there any way I can test whether the socket connection is alive from the server side?
does my approach above have flaws.
again it seems to work but i am not very Java savy lol. -
How to store the data read from excel using java code in Ms access database
Hi. I wrote a code to read the data from excel. May i know how can i save it to Ms access database using java. Also i have many excels. So i should not connect the database using DSN. So is there any other way to achieve this?
kramish wrote:
Im pretty sure that Access does support JDBCNo it does not. It supports ODBC.
just doing a quick Google came up with some pages:
http://blog.taragana.com/index.php/archive/access-microsoft-access-database-from-java-using-jdbc-odbc-bridge-sample-code/
http://www.javaworld.com/javaworld/javaqa/2000-09/03-qa-0922-access.html
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To read a DLL from java using JNI
Hi,
I had some DLL files (VB 5.0) which are providing interfaces. Is there any chance of accessing that using java (JNI). Also is there any De - Compiler available so that I can get the source code of the DLL file.
Regards,
Hari.Hola Hari
To make a dll loadable through JNI, the interface
inside
the dll must be implemented the JNI way. Also a COM
interface does not help.
I would reccomend a certain product to automatise the
JNI interfacing process, but that would
require that you have the sourcecode of the dll
available.
But one thing you can do is to write a wrapper that
contains the dll classes and is implemented the JNI
way.
More precisely you write an interface wrapper in c/c++
that matches the methods of the dll and does use JNI
methods. Now inside that c++ wrapper you load the dll
and forward the calls from java to c++ vice versa.
Download the demo version of CENTRO.java here:
www.ablon.de
Bye, nilsHi Nils,
Thank you for your suggestion. Im new to JNI.
That dll's are in Visual Basic. I don't have the source code of the dll file. I got the interfaces available in the dll file from a Visual Basic program which make use of the dll file(which we are talking about). As I know only the method signatures in the interfaces(dll file), I request you to kindly provide me some help to wrap it in C/C++ program.
Thanks in advance.
Regards,
Hari. -
Java Applet that reads from file
I'm quite new to java, I'm fiddling around with it for a nonprofit organization.
I have a java program that reads from a specified file and generates output but my final goal is a search box on the website that will take user input, run it through my program which searches through a prespecified file, and generate output.
I'd appreciate any help.What can I do with this? I need it to be a String because I'm breaking it down to Tokens.
Thanks,
-Grant
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String MyArray[] = new String[5000];
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words = words + " " + input.next(); /*Without that space the string "words" contains is all just one word making it unTokenizable*/
}
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