Why do I get a Null Pointer in my test whenever I run it from the ant?My Test class Is:

package com.MySelf.exchangerate.exchange;


import static org.junit.Assert.assertEquals;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
import junit.framework.Test;
import  com.MySelf.exchangerate.application.ExchangeRateApplication;
import junit.framework.TestSuite;

public class ExchangeRateApplicationTestCase extends AbstractTestCase{

    public static final Logger logger=Logger.getLogger(ExchangeRateApplicationTestCase.class);
    private static final double delta = 1e-15;
    private ExchangeRateApplication exchangeRateApplication;

    private static String curCon,inpCur;


    public ExchangeRateApplicationTestCase( String testName ) {
        super( testName );
    }

    protected void tearDown()throws Exception{

    logger.debug("In method teardDown() which has annotation @after" );

        super.tearDown();
    }





    public void testExchangercase() {
        int expected=20;
        int actual = exchangeRateApplication.exchangercase();

        assertEquals(expected,actual);
    }

    public static Test suite() {

        setLog4J();

        logger.info( "In suite" );

        TestSuite testSuite = new TestSuite();

        testSuite.addTest(
                new ExchangeRateApplicationTestCase(
                        "testExchangercase" ) );

        return testSuite;
    }

    public static void main( String args[]){

        System.setProperty( "log4j.configuration",
            "C:/javafundamentals/MultiAntLatest2/" +
                "ant_template_core_java/SVN_LOCAL/log4j/log4j.xml" );

    BasicConfigurator.configure();
    //junit.textui.TestRunner.run(new TestSuite( ExchangeRateApplicationTestCase.class ) );

        junit.textui.TestRunner.run( suite() );


    }



   }

My Application is:

package com.MySelf.exchangerate.application;
  import java.util.*;
  import javax.swing.*;
  import java.awt.event.*;
  import org.apache.log4j.BasicConfigurator;
  import org.apache.log4j.Logger;
  import org.apache.log4j.xml.DOMConfigurator;
  import com.MySelf.exchangerate.interfaces.Convert;


  public class ExchangeRateApplication implements Convert{
    Logger logger = Logger.getLogger(ExchangeRateApplication.class);
    private double rate;
    private double startingAmt, inpAmt;
    private String curCon, fromStr, toStr;
    private String inpCur;



    public void setRate(String toStr, double rate){

        this.toStr = toStr;
        this.rate = rate;


    }
    public ExchangeRateApplication(String inpCur, String curCon){
        this.inpCur = inpCur;
        this.curCon = curCon;

    }

    public String getFromStr(){

        return fromStr;

    }

    public String getToStr(){

        return toStr;

    }

    public int exchangercase(){
        int rates=10;
        int inpAmnt=2;

    int conversion=rates*inpAmnt;
    return conversion;


    }

    public double exchanger (String inpCur, String curCon, double inpAmt){



        this.inpCur = inpCur;
        this.curCon = curCon;
        this.inpAmt = inpAmt;
        return inpAmt * rate;

    }


    public void inputOutput(){

        ArrayList a =new ArrayList();
        boolean keepPlaying = true;
        int selection;

        do{
        String inpCur = JOptionPane.showInputDialog(null, "Enter the type of currency you want to convert from:");
        String curCon = JOptionPane.showInputDialog(null, "Enter the type of currency you want to convert to:");
        String inpAmt = JOptionPane.showInputDialog(null, "Enter the amount you want to convert:");

            double conv = Double.parseDouble(inpAmt);
        a.add(inpCur);
        a.add(curCon);
        a.add(inpAmt);

            String setRate = JOptionPane.showInputDialog(null, "Set the rate of the currency you are going to convert to:");
            double rate = Double.parseDouble(setRate);
            a.add(rate);
            ExchangeRateApplication exchangeRateApplication = new ExchangeRateApplication(inpCur, curCon);
            exchangeRateApplication.setRate(curCon, rate);
            //System.out.print(inpAmt + " " + inpCur + " converted to " + curCon + " is " + exchangeRateApplication.exchanger(inpCur, curCon, conv) + " " + curCon);
        JOptionPane.showMessageDialog(null,inpAmt + " " + inpCur + " converted to " + curCon + " is " + exchangeRateApplication.exchanger(inpCur, curCon, conv) + " " + curCon);
            selection = JOptionPane.showConfirmDialog(null, "Would You Like to Convert Again?", "Confirmation", JOptionPane.YES_NO_OPTION);



        }



        while(keepPlaying = (selection == JOptionPane.YES_OPTION));
            JOptionPane.showMessageDialog(null, "\nThank you for using the converter!!!");
            System.exit(0);

    }


    public static void main(String[]args){

        String log4jXmlPath 
            = System.getProperty( "log4j.configuration" );

        System.out.println("log4jXmlPath = " + log4jXmlPath);

        if ( log4jXmlPath != null ) {

            DOMConfigurator.configure(log4jXmlPath);
        } 
        else {
            BasicConfigurator.configure();
        }

    Convert convert=new ExchangeRateApplication("USD","Kes");
    convert.inputOutput();


    }




}

My Junit.Xml is:

<?xml version="1.0" encoding="ISO-8859-1"?>
<project name="junit" basedir=".">
    <path id="classpath.junit">
        <pathelement location="${absolute.junit.build.classes.dir}"/>
        <fileset dir="${absolute.static.lib.dir}">
            <include name="**/*.jar"/>
        </fileset>
        <fileset dir="${absolute.command.dist.dir}">
            <include name="**/*.jar"/>
        </fileset>
        <fileset dir="${absolute.application.dist.dir}">
            <include name="**/*.jar"/>
        </fileset>
    </path>

        <target name="junit.compile">
            <javac destdir="${absolute.junit.build.classes.dir}" 
                nowarn="${build.compiler.nowarn}" 
                    debug="${build.compiler.compile.with.debug}">
            <src path="${absolute.junit.src.dir}"/>
            <classpath>
                <path refid="classpath.junit"/>
            </classpath>
        </javac>

        <copy todir="${absolute.junit.build.classes.dir}">
            <fileset dir="${absolute.junit.src.dir}">
                <include name="**/*.ear"/>
            </fileset>  
        </copy>
    </target>

    <target name="junit.run.tests" depends="build" description="run tests">

        <junit printsummary="yes" haltonfailure="no" failureproperty="junit_failed">

            <sysproperty key="log4j.configuration" 
                     value="${log4j.configuration}"/>

            <classpath refid="classpath.junit" />
            <formatter type="xml"/>

            <batchtest fork="yes" todir="${absolute.junit.data.dir}" 
                      failureproperty="junitfailed">
                <fileset dir="${absolute.junit.build.classes.dir}">
                    <include name="**/*Test*.class"/>
                    <exclude name="**/AbstractTestCase.class"/>
                </fileset>
            </batchtest>

        </junit>

        <antcall target="junit.make.report"/>

        <fail message="JUnit tests failed" if="junitfailed" />
    </target>

        <target name="junit.run.tests.debug" depends="build" description="run tests in debug mode">

        <junit printsummary="yes" haltonfailure="no" failureproperty="junit_failed">

            <sysproperty key="log4j.configuration" 
                         value="${log4j.configuration}"/>

                <jvmarg value="-Xdebug"/>
            <jvmarg value="-Xnoagent"/>
            <jvmarg value="-Djava.compiler=NONE"/>
            <jvmarg value="-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8787"/>         

            <classpath refid="classpath.junit" />
            <formatter type="xml"/>

                <batchtest fork="yes" todir="${absolute.junit.data.dir}">
                    <fileset dir="${absolute.junit.build.classes.dir}">
                        <include name="**/*Test*.class"/>
                        <exclude name="**/AbstractTestCase.class"/>
                    </fileset>
            </batchtest>
        </junit>

        <antcall target="junit.make.report"/>
        <fail message="JUnit tests failed" if="junitfailed" />      

    </target>

        <target name="junit.make.report">
            <junitreport todir="${absolute.junit.reports.dir}">
            <fileset dir="${absolute.junit.data.dir}">
                <include name="TEST-*.xml"/>
            </fileset>
            <report format="frames" todir="${absolute.junit.reports.dir}"/>
        </junitreport>
        </target> 

</project>

I get the below error on running the tests:

[junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0.141 sec
[junit] Test com.MySelf.exchangerate.exchange.ExchangeRateApplicationTestC
FAILED

Do you get the line number where the error occurs so you can find the null variable and fix the problem?

Yeah I found it; <testcase classname="com.MySelf.exchangerate.exchange.ExchangeRateApplicationTestCase" name="testExchangercase" time="0.016">
<error type="java.lang.NullPointerException">java.lang.NullPointerException at com.MySelf.exchangerate.exchange.ExchangeRateApplicationTestCase.testExchangercase(ExchangeRateApplicationTestCase.java:37)</error>
</testcase>
So I changed ExchangeRateApplicationTestCase to point to a Convert interface I created in the same package and introduced setUp method:

  protected void setUp() throws Exception {
    super.setUp();
    convert = new ExchangeRateApplication(inpCur, curCon);
}

And That was it!

Thank You VERy much.

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