Link to my new blog

My new blog

JSP custom tags study link

http://docs.oracle.com/javaee/1.4/tutorial/doc/JSPTags5.html

Jump Start with Activiti BPM along with Spring mvc

To create web application using spring mvc and activiti in background

This post has been migrated to following link.

 My new blog

steps :1
create maven project with following pom

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

 <modelVersion>4.0.0</modelVersion>

 <groupId>com.gk</groupId>

 <artifactId>activitiMakerChecker</artifactId>

 <packaging>war</packaging>

 <version>0.0.1-SNAPSHOT</version>

 <name>activitiMakerChecker Maven Webapp</name>

 <url>http://maven.apache.org</url>

 <properties>

 <org.springframework.version>4.2.4.RELEASE</org.springframework.version>

  <jdk.version>1.6</jdk.version>

  <spring.version>4.0.5.RELEASE</spring.version>

  <jstl.version>1.2</jstl.version>

  <servletapi.version>3.1.0</servletapi.version>

  <org.hibernate.version>4.0.1.Final</org.hibernate.version>

  <org.hibernate.annotation.version>3.5.6-Final</org.hibernate.annotation.version>

 </properties>

 <dependencies>

  <!-- Activiti dependencies -->

  <dependency>

   <groupId>org.activiti</groupId>

   <artifactId>activiti-engine</artifactId>

   <version>5.14</version>

  </dependency>

  <dependency>

   <groupId>org.activiti</groupId>

   <artifactId>activiti-spring</artifactId>

   <version>5.14</version>

  </dependency>

    <dependency>

   <groupId>org.springframework</groupId>

   <artifactId>spring-beans</artifactId>

   <version>${org.springframework.version}</version>

  </dependency>

  <dependency>

   <groupId>org.springframework</groupId>

   <artifactId>spring-context</artifactId>

   <version>4.2.4.RELEASE</version>

  </dependency>

  <dependency>

   <groupId>org.springframework</groupId>

   <artifactId>spring-jdbc</artifactId>

   <version>4.2.4.RELEASE</version>

  </dependency>

  <dependency>

   <groupId>org.springframework</groupId>

   <artifactId>spring-tx</artifactId>

   <version>4.2.4.RELEASE</version>

  </dependency>

  <dependency>

   <groupId>org.springframework</groupId>

   <artifactId>spring-orm</artifactId>

   <version>${org.springframework.version}</version>

  </dependency>

  <dependency>

   <groupId>org.slf4j</groupId>

   <artifactId>slf4j-api</artifactId>

   <version>1.7.2</version>

  </dependency>

  

  

  <!-- Hibernate dep -->

  <dependency>

   <groupId>org.hibernate</groupId>

   <artifactId>hibernate-core</artifactId>

   <version>${org.hibernate.version}</version>

  </dependency>

  <dependency>

   <groupId>org.hibernate</groupId>

   <artifactId>hibernate-entitymanager</artifactId>

   <version>${org.hibernate.version}</version>

  </dependency>

  <dependency>

   <groupId>org.hibernate</groupId>

   <artifactId>hibernate-annotations</artifactId>

   <version>${org.hibernate.annotation.version}</version>

  </dependency>

  <!-- Oracle dependency -->

  <dependency>

   <groupId>com.oracle</groupId>

   <artifactId>ojdbc6</artifactId>

   <version>11.2.0.3</version>

  </dependency>



  <dependency>

   <groupId>org.springframework</groupId>

   <artifactId>spring-webmvc</artifactId>

   <version>${spring.version}</version>

  </dependency>



  <dependency>

   <groupId>javax.servlet</groupId>

   <artifactId>jstl</artifactId>

   <version>${jstl.version}</version>

  </dependency>





  <dependency>

   <groupId>junit</groupId>

   <artifactId>junit</artifactId>

   <version>3.8.1</version>

   <scope>test</scope>

  </dependency>

 </dependencies>

 <build>

  <finalName>activitiMakerChecker</finalName>

 </build>

</project>







Now run command :



mvn eclipse:eclipse -Dwtpversion=2.0








,

step 2:

web.xml

<!DOCTYPE web-app PUBLIC

 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>

  <display-name>Archetype Created Web Application</display-name>

    <servlet>

    <servlet-name>hello</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>hello</servlet-name>

    <url-pattern>/</url-pattern>

  </servlet-mapping>

</web-app>

hello-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"

xsi:schemaLocation="http://www.springframework.org/schema/beans 

  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 

  http://www.springframework.org/schema/context 

  http://www.springframework.org/schema/context/spring-context-3.0.xsd 

  http://www.springframework.org/schema/aop

  http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 

  http://www.springframework.org/schema/mvc 

  http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

<context:component-scan base-package="com" />

<mvc:annotation-driven />

<bean id="dataSource"

class="oracle.jdbc.pool.OracleDataSource">

<property name="URL" value="your url" />

<property name="user" value="user" />

<property name="password" value="password" />

</bean>

<bean id="transactionManager"

class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

<property name="dataSource" ref="dataSource" />

</bean>

<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">

<property name="dataSource" ref="dataSource" />

<property name="transactionManager" ref="transactionManager" />

<property name="databaseSchemaUpdate" value="false" />

<property name="jobExecutorActivate" value="false" />

</bean>

<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">

<property name="processEngineConfiguration" ref="processEngineConfiguration" />

</bean>

<bean id="repositoryService" factory-bean="processEngine"

factory-method="getRepositoryService" />

<bean id="runtimeService" factory-bean="processEngine"

factory-method="getRuntimeService" />

<bean id="taskService" factory-bean="processEngine"

factory-method="getTaskService" />

<bean id="historyService" factory-bean="processEngine"

factory-method="getHistoryService" />

<bean id="managementService" factory-bean="processEngine"

factory-method="getManagementService" />

<bean id="viewResolver"

class="org.springframework.web.servlet.view.InternalResourceViewResolver">

<property name="prefix" value="/WEB-INF/jsp/" />

<property name="suffix" value=".jsp" />

</bean>

</beans>

step 3


Java code

package com.nuc.process;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.ProcessEngines;
import org.activiti.spring.SpringProcessEngineConfiguration;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;


@Controller
public class MyProcess {

 @Autowired
 ProcessEngine processEngine;
 @RequestMapping(value="hello")
 public String sayHello() {
  System.out.println("Controlle is here");
  if(processEngine==null)
  {
   System.out.println("Nulla");
  }
  else
  {
   System.out.println("Not null");
  }
  
  
  return "welcome";
 }
}

Controller class

package com.gk.controller;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpSession;

import org.activiti.bpmn.model.UserTask;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.task.Task;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.gk.dao.Dao;
import com.gk.dao.User;
import com.nuc.service.UserTaskList;


@Controller
public class MyController {

 @Autowired
 @Qualifier("dao")
 Dao dao;
 
 @Autowired
 private ProcessEngine processEngine;
 @RequestMapping(value=("login"),method=RequestMethod.POST)
 public String login(@RequestParam("name")String name,@RequestParam("pass")String pass,@RequestParam("gName")String gName,HttpSession session
   ) {
  
  User u1=new User();
  u1.setName(name);
  u1.setgName(gName);
  u1.setPass(pass);
//  dao.save(u1);
 // return "welcome";
 
  String vl="rtl";
  String js="/resources/js/rtl.js";
  if(vl.equalsIgnoreCase("rtl"))
  {
    js="/resources/js/rtl.js";
  }
  session.setAttribute("js", js);

 
 //  " rel="stylesheet">
  //    

  User u2=dao.findById(name);
  if(u2!=null)
  {
   if(u1.getPass().equals(u2.getPass())&&u1.getgName().equals(u2.getgName()))
   {
    
    session.setAttribute("user", u1);
    return "welcome";
   }
   else
   {
    return "error";
   }
  }
  else
  {
   return "error";
  }
  
  
 }
 
 @RequestMapping(value="startProcess",method=RequestMethod.GET)
 public String startProcess(HttpSession session) {
  
  System.out.println("starting new process");
  
  Mapvariables=new HashMap();
  variables.put("name", "true");
  processEngine.getRepositoryService().createDeployment().addClasspathResource("myProcess.bpmn20.xml").deploy();
  processEngine.getRuntimeService().startProcessInstanceByKey("myProcess",variables);
  User user=(User)session.getAttribute("user");

  //processEngine.getRuntimeService().setVariablesLocal("vars", variables);
 // processEngine.getRuntimeService().setVariables("var", variables);
  session.setAttribute("processEngine", processEngine);
  return "myTask";
  
 }
 @RequestMapping(value="myTasks",method=RequestMethod.GET)
 public String myTasks(HttpSession session) {
 
 //System.out.println("starting new process");
  
  User user=(User)session.getAttribute("user");
  session.setAttribute("processEngine", processEngine);
  
  return "myTask";
  
 }
 
 @RequestMapping(value="claim",method=RequestMethod.GET)
 public String claim(@RequestParam("id")String id,HttpSession session) {
  
  User user=(User)session.getAttribute("user");
  processEngine.getTaskService().claim(id,user.getName());
  
  return "myTask";
 }
 
 @RequestMapping(value="complete",method=RequestMethod.GET)
 public String complete(@RequestParam("id")String id,HttpSession session) {
  
  User user=(User)session.getAttribute("user");
  processEngine.getTaskService().complete(id);
  
  return "myTask";
 }

}

JSPs

index.jsp

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    
<body>
<h2>Hello World! gk1</h2>
<center>
<br>
<form method="post" action="login">

<input type="text" name="name">
<br><br>
<input type="password" name="pass">
<br><br>
<select name="gName">
 <option>m</option>
 <option>c</option>
</select>
<br><br><br>
<input type="submit">
</form>
</center>
</body>
</html>

welcome.jsp

<%@page import="com.gk.dao.User"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>

<%

String myvar=(String)session.getAttribute("js");
%>

 <link href="<c:url value="/resources/css/rtl.css" />" rel="stylesheet">
 <script src=<c:url value="<%=myvar %>" />></script>
</head>
<body>
Welcome <%
User user=(User)session.getAttribute("user");
if(user!=null)
{
 out.print(user.getName());
}

%>

<%= session.getAttribute("js") %>
<c:catch>


</c:catch>
<a href="startProcess">Start Process</a>
<a href="myTasks">MyTasks</a>
</body>
</html>

mytask.jsp

<%@page import="org.activiti.engine.ProcessEngine"%>
<%@page import="org.activiti.engine.task.Task"%>
<%@page import="java.util.List"%>
<%@page import="com.gk.dao.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

your tasks


<%
 User user=(User)session.getAttribute("user");
 ProcessEngine processEngine=(ProcessEngine)session.getAttribute("processEngine");
 List<Task>tasks=processEngine.getTaskService().createTaskQuery().taskCandidateGroup(user.getgName()).list();
 out.print("<br>");
 out.print("Tasks in your group");
 for(Task t:tasks)
 {
  out.print("<br>Id:"+t.getId()+"Name:"+t.getName()+"<a href='claim?id="+t.getId()+"'>Claim it</a>");
 }
 out.print("<br>");
 out.print("Your tasks");
 List<Task>myTasks=processEngine.getTaskService().createTaskQuery().taskAssignee(user.getName()).list();
 for(Task t:myTasks)
 {
  out.print("<br>Id:"+t.getId()+"Name:"+t.getName()+"<a href='complete?id="+t.getId()+"'>Complete it</a>");
 }
 
%>
</body>
</html>

Bean Inheritance

http://programmingoverflow14.blogspot.in/p/spring.html#bean-inheritance

Spring Autowiring

Docs : http://docs.spring.io/spring/docs/4.2.x/spring-framework-reference/html/beans.html#beans-factory-autowire
My notes:http://programmingoverflow14.blogspot.in/p/spring.html#autowiring

Strings in java are called by value not reference

Why?

Because String is immutable.

Assert in java

public class Test2 { public static int x; public static int foo(int y) { return y * 2; } public static void main(String [] args) { int z = 5; assert z > 0; /* Line 11 */ assert z > 2: foo(z); /* Line 12 */ if ( z < 7 ) assert z > 4; /* Line 14 */ switch (z) { case 4: System.out.println("4 "); case 5: System.out.println("5 "); default: assert z < 10; } if ( z < 10 ) assert z > 4: z++; /* Line 22 */ System.out.println(z); } } which line is an example of an inappropriate use of assertions?

A. Line 11 B. Line 12 C. Line 14 D. Line 22 Answer: Option D Explanation: Assert statements should not cause side effects. Line 22 changes the value of z if the assert statement is false. Option A is fine; a second expression in an assert statement is not required. Option B is fine because it is perfectly acceptable to call a method with the second expression of an assert statement. Option C is fine because it is proper to call an assert statement conditionally.

Reference :http://www.indiabix.com/online-test/java-programming-test/61