What this running error means? - spring

Question

Hello, I`m trying to run a job in spring batch but its giving me this error which i dont know how to solve:
`$` C:\Program Files\Microsoft Visual Studio 8\VC>java -jar C:\Workspacetest\testpro
ject\target\ams-eod-0.0.1-SNAPSHOT.jar copyJob 1 `$`
Exception in thread "main" java.lang.NullPointerException
at sun.launcher.LauncherHelper.getMainClassFromJar(LauncherHelper.java:399)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:463)
However this is my applicationcontext. can anyone help me regarding this error please?
few words to discribe what the job does, this job reads from a database some records and then it performs a calculation on each record (row * 3.75) and then update the record.
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/batch"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/batch
http://www.springframework.org/schema/batch/spring-batch-2.2.xsd">
<beans:bean id="itemReader" class="org.spr...JdbcCursorItemReader">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="sql" value="select * from Trans WHERE id =?"/>
<beans:property name="rowMapper" ref= "CustomerCreditRowMapper"/>
<beans:property name="preparedStatementSetter" ref="idSetter"/>
</beans:bean>
<beans:bean id="transactionProcessor" class="">
<beans:property name="targetObject" ref="Processing"/>
<beans:property name="targetMethod" value="process"/>
</beans:bean>
<beans:bean id="jdbcWriter"
class="org.springframework.batch.item.database.JdbcBatchItemWriter">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="sql" value="update Trans set (amount) values (?)"/>
<beans:property name="preparedStatementSetter" ref="idSetter"/>
</beans:bean>
<step id="CopyFileStep">
<tasklet>
<chunk reader="itemReader"
processor="transactionProcessor"
writer="jdbcWriter"
commit-interval="10"/>
</tasklet>
</step>
<job id="copyJob">
<step id="step1" parent="CopyFileStep"/>
</job>
<beans:bean id="preparedStatementSetter"
class="sa.com.anb.itg.dev.settlement.batch.Itemwriter"/>
<beans:bean id="idSetter" class="sa.com.anb.itg.dev.settlement.batch.idSetter"
scope="step">
<beans:property name="id" value="#{jobParameters[id]}"/>
</beans:bean>
<beans:bean id="CustomerCreditRowMapper"
class="sa.com.anb.itg.dev.settlement.batch.CustomerCreditRowMapper"/>
<beans:bean id="AmountToTransactionItemProcessor"
class="sa.com.anb.itg.dev.settlement.batch.AmountToTransactionItemProcessor">
<beans:property name="TransactionDAO" ref="TransactionDAO"/>
</beans:bean>
<beans:bean id="TransactionDAO" class="sa.com.anb.itg.dev.settlement.batch.TransactionDAO">
<beans:property name="datasource" ref="dataSource"/>
</beans:bean>
<beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<beans:property name="driverClassName" value="org.hsqldb.jdbcDriver" />
<beans:property name="url" value="jdbc:oracle:thin:#192.168.84.208:1556:pay10g" />
<beans:property name="username" value="ams_recon" />
<beans:property name="password" value="ams_recon" />
</beans:bean>
<beans:bean id="jobRepository"
class="org.springframework.batch.core.repository.support.JobRepositoryFactoryBean">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="transactionManager" ref="transactionManager"/>
</beans:bean>
<beans:bean id="jobLauncher"
class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
<beans:property name="jobRepository" ref="jobRepository" />
</beans:bean>
<beans:bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager" lazy-init="true">
<beans:property name="dataSource" ref="dataSource"/>
</beans:bean>
</beans:beans>

Answer 1

Well, when launching an App you REALLY need a Main Class.
Spring Batch can provide one for you : CommandLineJobRunner.
In your example it seems that your are trying to execute your app like a regular one with the commandLine. Here Java try to locate you Manifest File because the JVM NEEDS a Main class and it's not able to find it in your JAR which cause your error.
It's not your app that you have to launch with the command line, it's the CommandLineJobRunner which provide a Main method able to launch your batch.
The documentation show how to use it : http://static.springsource.org/spring-batch/reference/html/configureJob.html#runningJobsFromCommandLine