Taranmeet: August 2008

Wednesday, 27 August 2008

Software engineering principals

Slides from the book Object-Oriented Software Engineering: Practical Software Development using UML and Java

http://www.site.uottawa.ca/school/research/lloseng/supportMaterial/slides/

The book was written by professor By Timothy C. Lethbridge and Robert Laganière, the book is bit old but the principals hold true.

Read write file stored in class folder of webapp

Read data from classes folder in WEB-INF.

Insure that text/xml file is packaged into the classes folder

Create a utility class to do file reading. This was tested in weblogic and tomcat

See code below:

package com.mp.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class FileReader {

public String readTextFile(final String name) throws Exception {
StringBuffer xmlFromFile = new StringBuffer();
InputStream instr = null;
instr = getFilePath2(name);

if (instr == null)
throw new FileNotFoundException();
InputStreamReader streamreader= null;

try {

streamreader= new InputStreamReader(instr);
int x = 0;
x = streamreader.read();
char c;
while (x != -1) {
c= (char) x;
xmlFromFile.append(c);
x = streamreader.read();

}

} catch (Exception e) {

System.out.println("Exception " + e.getMessage());
throw e;

} finally {
streamreader.close();

}

return xmlFromFile.toString();

}

public byte[] readBinFileFromClassPath(final String name) throws Exception {

byte bytearray[]= null;
FileInputStream fileinputstream=null;
try {

fileinputstream = new FileInputStream(getFilePath(name));
int numberBytes = fileinputstream.available();
bytearray = new byte[numberBytes];
fileinputstream.read(bytearray);

} catch (Exception e) {
System.out.println("Exception " + e.getMessage());
throw e;

} finally {
if(fileinputstream!=null)
fileinputstream.close();
}

return bytearray;
}

public byte[] readBinFilePath(final String name) throws Exception {

byte bytearray[]= null;
FileInputStream fileinputstream=null;
try {

fileinputstream = new FileInputStream(name);
int numberBytes = fileinputstream.available();
bytearray = new byte[numberBytes];
fileinputstream.read(bytearray);

} catch (Exception e) {
System.out.println("Exception " + e.getMessage());
throw e;

} finally {
if(fileinputstream!=null)
fileinputstream.close();
}

return bytearray;
}

public void writeBinFileToPath(String name, byte data[]) throws IOException{

FileOutputStream fileoutputstream =new FileOutputStream(name);

try {
fileoutputstream.write(data );

} catch (IOException e) {
System.out.println(e.getMessage());

}finally{
if(fileoutputstream!=null)
fileoutputstream.close();
data=null;
}

}

private InputStream getFilePath2(String filename) {
return this.getClass().getClassLoader().getResourceAsStream(filename);

}

private String getFilePath(String filename) throws FileNotFoundException {
String path=this.getClass().getClassLoader().getResource(filename).getPath();
if ("".equals(path))
throw new FileNotFoundException();
return path;

}

}

Tuesday, 26 August 2008

Web Service calls in BEA Aqualogic BPM 6

I spend quite a bit of time searching how to make web service calls in Aqualogic BPM. There is virtually no document, except for Expense report tutorial which still does not answer the question.

The solution

Below is an example code you could place in interactive process to

service2 as Webservice.HelloWsdl.HelloService = Webservice.HelloWsdl.HelloService ();

sayHello
service2

using string1.string1

returning result4 = @out

string1.string2=result4

Another interesting point to note is that Aqualogic supports XPDL

One XPDL tutorial that I found to be useful

http://www.together.at/together/zzznocms/twe/twedoc/twe.html#d0e1719

UI prototyping

Just came across this plugin for UI prototyping. No separate application is require and it has quite a bit of features

https://addons.mozilla.org/en-US/firefox/addon/8487

Faster Java development

JavaRebel is a JVM plugin (-javaagent) that enables to reload changes made to Java class files on-the-fly, saving developers the time that it takes to redeploy an application or perform a container restart. It is a generic solution that works for Java EE and Java standalone applications

http://www.zeroturnaround.com/javarebel/

http://www.zeroturnaround.com/docs/javarebel-jpetstore-screencast Shows how it works

Thursday, 21 August 2008

UI mock up in browser

Create UI mock ups in web browser

http://blogs.atlassian.com/developer/2008/07/balsamiq_mockups_brings_paper.html

Project templates, archetypes

Often it is found at project inception stage people ponder over project structure and then manually create them.

Instead one could use standard templates or archtypes in Maven world.

Below are some ready to use templates for projects

http://docs.codehaus.org/display/MAVENUSER/Archetypes+List

ach archetype page should enforce the following pattern :

* Archetype name

* Command line to call the archetype

* If the archetype can be used in an existing projects directory

* A tree view of the resulting files

* Some additional information like the additional properties used by the plugin

To use an archetype:

mvn archetype:generate

Generate gives you a wizard that will walk you through the various choices.

mvn
org.apache.maven.plugins:maven-archetype-plugin:1.0-alpha-7:create
-DgroupId= -DartifactId= -DarchetypeArtifactId= -DarchetypeGroupId=

Find Jar files

I have found this website and it's quite useful when it comes to finding a jar file or when you are trying to find which jar a class belongs to.

http://findjar.com

Wednesday, 20 August 2008

Generate Logging code using eclipse plug-in LOG 4 E

A neat plug-in for logging in java code, this could be useful in case one has code base without proper logging, other usage scenarios include, if one has to change logging API, or just a handy code generation utility.

http://log4e.jayefem.de/content/view/10/6/

Taran