Sample batch file (.bat) to run jar package

Here is a sample batch file to run a jar file. Just include the classpath of jars needed and replace the name of jar and the class name to run. All the classpath are declared here much simpler than changing the MANIFEST file in jar. For instance the below is to run MyApp.jar class of MyAppScreen. Also useful to run an application that need additional memory by declaring  -Xms512M -Xmx1024M displayed at the bottom of the script.


@echo off
if "x%JAVA_HOME%" == "x" (
  set  JAVA=java
  echo JAVA_HOME is not set. Unexpected results may occur.
  echo Set JAVA_HOME to the directory of your local JDK to avoid this message.
) else (
  set "JAVA=%JAVA_HOME%\bin\java"
  echo %JAVA%
)


set CURRENT_DIR=%cd%


rem cd ..


set HOME=%cd%


cd %CURRENT_DIR%


rem set HOME=%CURRENT_DIR%


echo home %HOME%
echo current %CURRENT_DIR%


set MY_CLASSPATH=%HOME%\MyApp.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\arq.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\antlr-2.7.6.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\arq-extra.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\asm-3.3.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\cglib-2.2.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\concurrent.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\commons-beanutils-1.7.0.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\commons-collections-3.1.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\commons-fileupload-1.2.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\commons-io-1.3.1.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\commons-lang-2.4.jar
set MY_CLASSPATH=%MY_CLASSPATH%;%HOME%\lib\dom4j-1.6.1.jar




echo ========================================================================
echo.
echo   My App Utility
echo.
echo   HOME: %HOME%
echo.
echo   JAVA: %JAVA%
echo.
echo   JAVA_OPTS: %JAVA_OPTS%
echo.
echo   CLASSPATH: %MY_CLASSPATH%
echo.
echo ========================================================================
echo.




"%JAVA%" -Xms512M -Xmx1024M %JAVA_OPTS% ^
   -cp "%MY_CLASSPATH%" my.com.app.MyAppScreen %*
pause

Webservice deploy error in jboss 5

If during deployment of webservice jars into jboss 5 it is unable to deploy and the error is something as below

ERROR [[WorkflowServiceImpl]] Servlet.service() for servlet Workflo
wServiceImpl threw exception
java.lang.UnsupportedOperationException: setProperty must be overridden by all s
ubclasses of SOAPMessage
        at javax.xml.soap.SOAPMessage.setProperty(SOAPMessage.java:445)
        at org.jboss.ws.core.soap.SOAPMessageImpl.<init>(SOAPMessageImpl.java:87
)

Means there are jars missing in the server that is essential to deploying the service. Make sure in the jboss server path
<jboss>\lib\endorsed
the following jars existed
jbossws-native-jaxrpc, 
jbossws-native-jaxws,
jbossws-native-jaxws-ext 
jbossws-native-saaj

The jars can be found in the latest jboss 6 version. Jboss version 6 and 7 , no such issue with the deployment of  web service.

Creating a runnable jar file

Creating a runnable jar requires creating a manifest file. Package the classes files into a jar file. Inside the jar create folder META-INF and create file MANIFEST.MF.
The structure is abc.jar/META-INF/MANIFEST.MF
Edit the manifest file by adding the file to run and library jars required for the program as below example.
Main-Class is the class file to run. Make sure it has public static void main(String[] args) in the class to enable it to run.
Class-Path are the library jars.

Manifest-Version: 1.0
Created-By: 1.6.0_07 (Sun Microsystems Inc.)
Main-Class: my.program.gen.GeneratorProcess
Class-Path: lib/antlr-2.7.6.jar lib/cglib-2.2.jar lib/poi-3.7-20101029.jar lib/poi-examples-3.7-20101029.jar lib/poi-ooxml-3.7-20101029.jar lib/poi-ooxml-schemas-3.7-20101029.jar lib/poi-scratchpad-3.7-20101029.jar lib/xml-apis.jar lib/xmlbeans-2.3.0.jar lib/commons-logging.jar lib/xercesImpl.jar lib/iri.jar lib/jaws-bin.jar lib/icu4j_3_4.jar lib/concurrent.jar lib/dom4j-1.6.1.jar


To run the jar an executable .bat file is useful. A sample content of .bat file are as below

java -Xms512M -Xmx1024M -jar Generator.jar

Multithread java class

Here is a sample class to run multiple thread in a class. All threads are started in a for loop and after all threads are finished thread join function will wait for all thread to finish.

public class MultiThreadRules {

class MultiThreads implements Runnable {
   private String rulePath;
   public MultiThreads(String rulePath){
                this.rulePath = rulePath;



for(int i=0; i<=5, i++){ //number of threads
this.inputValue = inputValue;
Thread t = new Thread(this);
t.start(); //all threads started
threads.add(t);  
}

try {
for(Thread tt:threads){
tt.join(); //all threads are done
}

} catch (InterruptedException e) {
logger.error(e.getMessage());
}




     }
     public void run() {
      //perform action here
     }
  }


}

Create excel file report with multiple sheets using poi

Previously have done a program to generate and populate excel file on multiple sheets. Firstly download the poi framework jar files from their website http://poi.apache.org/.
Then using array of strings, populate the array according to where the location the cell is. Example below, first array is the row and second array is the column.

String[][] excelData = new String[2000][50];

excelData[0][0] = "Title";
excelData[0][1] = "Name";
excelData[0][2] = "Code";
excelData[0][3] = "Description";


excelData[1][0] = "title 1";
excelData[1][1] = "mike";
excelData[1][2] = "code 1";
excelData[1][3] = "Description 1";


Depending on the number of sheets to generate in the excel file, add the array of strings into an arraylist.

Then pass the list of string of array to the method below together with the file name of excel to generate.
The sheet name to generate is declared in variable sheetName.


private static void writeDataToExcelFile(String fileName,
List<String[][]> resList) {
HSSFWorkbook myWorkBook = new HSSFWorkbook();
String sheetName = "";
for (int i = 0; i < resList.size(); i++) {
sheetName = "Document-" + i;
HSSFSheet mySheet = myWorkBook.createSheet(sheetName);
HSSFRow myRow = null;
HSSFCell myCell = null;
String[][] excelData = resList.get(i);
for (int rowNum = 0; rowNum < excelData.length; rowNum++) {
myRow = mySheet.createRow(rowNum);
for (int cellNum = 0; cellNum < excelData[0].length; cellNum++) {
myCell = myRow.createCell(cellNum);
myCell.setCellValue(excelData[rowNum][cellNum]);
}
}
}


try {
FileOutputStream out = new FileOutputStream(fileName + ".xls");
myWorkBook.write(out);
out.close();
} catch (Exception e) {
e.printStackTrace();
}


myWorkBook = null;

}

Reading properties file in java

Reading properties file is straightforward using ResourceBundle java util. Below are the codes. ResourceBundle will get the information from the setting-config.properties file. Make sure the properties file is  in the same path as the java class. The data obtained is passed into a map for easy retrieval using key value later.

private HashMap<String, String> propertiesMap = new HashMap<String, String>();

private ResourceBundle resourceBundle = null;


protected void readProperties() {
List<String> propList = new ArrayList<String>();
try {
resourceBundle = ResourceBundle.getBundle("setting-config");
for (Iterator<String> iterator = resourceBundle.keySet().iterator(); iterator.hasNext();) {
String keyString = iterator.next();
propertiesMap.put(keyString, resourceBundle.getString(keyString));
}
}catch (Exception exception) {
System.out.print(exception.getLocalizedMessage());
}
}

Simple program to tail a log file

Recently I came across a requirement to develop a a logging program that tails the log file, similar to a tail log program. I need to tail the specific number of lines of a log file. After some research I decided to go with RandomAccessFile method of getting the check the last number of lines. Then I need something to keep on reading the log file and print it out. Try to use RandomAccessFile but it keeps locking the log file and unable to read it in real time. Then I try the BufferedReader with threading approach although the end result of printing out the output is there will be an extra new line as it prints out the values in the console.
Tried to resolve this extra new line but can't find any solution to it. Anyway the code is as below.


public class Tailog implements Runnable {
boolean execute = true;
BufferedInputStream reader;
BufferedReader in;
File file;
RandomAccessFile raf;
InputStreamReader inputStreamReader;
BufferedReader bufferedReader;
PrintWriter pwriter;
public Tailog() {
}
public Tailog(long numLine, String fileName, PrintWriter pw) {
try {
file = new File(fileName);
try {
//get last n lines
raf = new RandomAccessFile(file, "rw");
List<Long> seekPosi = new ArrayList<Long>();
long fileLength = file.length();
long tailrow = 0;
for (long i = fileLength - 2; i >= 0; i--) {
raf.seek(i);
String readLine = raf.readLine();


if (readLine.equals("")) {
seekPosi.add(i - 1);
tailrow++;
i--;
}
if (tailrow == numLine)
break;
}


Collections.sort(seekPosi);
for (long x : seekPosi) {
raf.seek(x + 2);
String printLine = raf.readLine();
pw.println(printLine);


}
raf.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}


// start read line by line
inputStreamReader = new InputStreamReader(new FileInputStream(
fileName));
bufferedReader = new BufferedReader(inputStreamReader);
String line = bufferedReader.readLine();
while (line != null) {
line = bufferedReader.readLine();
}
pwriter = pw;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}


public void run() {
while (execute) {
try {
String line = bufferedReader.readLine();
if (line != null) {
pwriter.println(line);
pwriter.flush();
} else {
try {
Thread.sleep(500);
} catch (InterruptedException ex) {
execute = false;
}
}


} catch (Exception e) {
e.printStackTrace();
}
}
}


public static void main(String[] args) throws Exception {
PrintWriter pw = new PrintWriter(System.out, true);
String numLineStr = "";
String fileName = "";
try {
numLineStr = args[0];
fileName = args[1];
} catch (Exception e) {
e.printStackTrace();
}

long numLine = 0;
try {
numLine = Long.parseLong(numLineStr);
File file = new File(fileName);
if(file.exists()){
Tailog tailog = new Tailog(numLine, fileName, pw);
tailog.run();
}
else{
pw.println("Please specify correct file name: eg C:/server/log/server.log");
}
} catch (Exception e) {
e.printStackTrace();
pw.println("Please specify correct command: java -jar Tailog.jar <number of lines> <file name>");
}
}
}