Parallel Step execution in spring batch - spring-batch

Question

Right now I got to know that we can run concurrent steps in spring batch using Parallel Steps (http://docs.spring.io/spring-batch/trunk/reference/html/scalability.html 7.2).I did and got success with it.
But When I see the database what has happened is person record in the table is updated with others person information, though I have made my ItemProcessor as synchronized.
Background about what job is doing is simple, just process person records from person table across department (200,400) and writes in to a flat file.
When I saw flat file I could see records a person from department 200 is written with person information from department 400.Kindly help is any thing i need to take care of?
<batch:job id="dept">
<batch:step id="dojStep1" parent="dojMainStep1" next="parallelProcessMatch">
</batch:step>
<batch:split id="parallelProcessMatch" task-executor="taskExecutor">
<batch:flow>
<batch:step id="step200" parent="dojMainStep200" >
</batch:step>
</batch:flow>
<batch:flow>
<batch:step id="step400" parent="dojMainStep400" >
</batch:step>
</batch:flow>
</batch:split>
</batch:job>
<bean id="taskExecutor" class="org.springframework.core.task.SimpleAsyncTaskExecutor"/>
<!-- Start parallelProcessMatch -->
<!-- Start dojMainStep200 -->
<batch:step id="dojMainStep200" abstract="true">
<batch:tasklet>
<batch:chunk commit-interval="1000" reader="dojDbReader200"
processor="dojMatchItemProcessor200" writer="dojClassifierMatchReportWriter200">
<batch:streams>
<batch:stream ref="itemWriterMatch200" />
<batch:stream ref="itemWriterUnMatch200" />
</batch:streams>
</batch:chunk>
</batch:tasklet>
<batch:listeners>
<batch:listener ref="dojMatch200PageHeaderCallback" />
<batch:listener ref="dojUnMatch200PageHeaderCallback" />
<batch:listener ref="dojInPageFooterCallback" />
</batch:listeners>
</batch:step>
<bean id="dojMatchItemProcessor200"
class="com.batchinterface.dept.recordresultsvr.DojMatchItemProccesor"
p:holdingTankDao-ref="holdingTankDao" p:rsdProvider-ref="rsdProvider" p:searchProvider-ref="searchProvider" />
<bean id="dojDbReader200"
class="org.springframework.batch.item.database.StoredProcedureItemReader"
p:dataSource-ref="oracleDataSource" p:rowMapper-ref="dojMatchRowMapper200"
scope="step" p:function="false" p:procedureName="PKG_JOIN.PRC_SELECT"
p:preparedStatementSetter-ref="dojmatchpropertySetter200"
p:refCursorPosition="1">
<property name="parameters">
<list>
<bean class="org.springframework.jdbc.core.SqlOutParameter">
<constructor-arg index="0" value="c1" />
<constructor-arg index="1">
<util:constant static-field="oracle.jdbc.OracleTypes.CURSOR" />
</constructor-arg>
</bean>
<bean class="org.springframework.jdbc.core.SqlParameter">
<constructor-arg index="0" value="dept" />
<constructor-arg index="1">
<util:constant static-field="oracle.jdbc.OracleTypes.VARCHAR" />
</constructor-arg>
</bean>
</list>
</property>
</bean>
<bean id="dojmatchpropertySetter200"
class="com.batchinterface.dept.recordresultsvr.DojPreparedStateSetter">
<property name="dept" value="200" />
</bean>
<bean id="dojMatchRowMapper200"
class="com.batchinterface.dept.recordresultsvr.DojMatchRowMapper" />
<bean id="dojClassifierMatchReportWriter200"
class="org.springframework.batch.item.support.ClassifierCompositeItemWriter"
p:classifier-ref="dojMatchClassifier200">
</bean>
<bean id="dojMatchClassifier200"
class="com.batchinterface.dept.recordresultsvr.DojMatchReportClassifier"
p:itemWriterMatch200-ref="itemWriterMatch200"
p:itemWriterUnMatch200-ref="itemWriterUnMatch200"
p:lastRunDate-ref="LastSuccessfulRunDate200">
</bean>
<!-- End dojMainStep200 -->
<!-- Start dojMainStep400 -->
<batch:step id="dojMainStep400" abstract="true">
<batch:tasklet>
<batch:chunk commit-interval="1000" reader="dojDbReader400"
processor="dojMatchItemProcessor400" writer="dojClassifierMatchReportWriter400">
<batch:streams>
<batch:stream ref="itemWriterMatch400" />
<batch:stream ref="itemWriterUnMatch400" />
</batch:streams>
</batch:chunk>
</batch:tasklet>
<batch:listeners>
<batch:listener ref="dojMatch400PageHeaderCallback" />
<batch:listener ref="dojUnMatch400PageHeaderCallback" />
<batch:listener ref="dojInPageFooterCallback" />
</batch:listeners>
</batch:step>
<bean id="dojMatchItemProcessor400"
class="com.batchinterface.dept.recordresultsvr.DojMatchItemProccesor"
p:holdingTankDao-ref="holdingTankDao" p:rsdProvider-ref="rsdProvider" p:searchProvider-ref="searchProvider" />
<bean id="dojDbReader400"
class="org.springframework.batch.item.database.StoredProcedureItemReader"
p:dataSource-ref="oracleDataSource" p:rowMapper-ref="dojMatchRowMapper400"
scope="step" p:function="false" p:procedureName="PKG_JOIN.PRC_SELECT"
p:preparedStatementSetter-ref="dojmatchpropertySetter400"
p:refCursorPosition="1">
<property name="parameters">
<list>
<bean class="org.springframework.jdbc.core.SqlOutParameter">
<constructor-arg index="0" value="c1" />
<constructor-arg index="1">
<util:constant static-field="oracle.jdbc.OracleTypes.CURSOR" />
</constructor-arg>
</bean>
<bean class="org.springframework.jdbc.core.SqlParameter">
<constructor-arg index="0" value="dept" />
<constructor-arg index="1">
<util:constant static-field="oracle.jdbc.OracleTypes.VARCHAR" />
</constructor-arg>
</bean>
</list>
</property>
</bean>
<bean id="dojmatchpropertySetter400"
class="com.batchinterface.dept.recordresultsvr.DojPreparedStateSetter">
<property name="dept" value="400" />
</bean>
<bean id="dojMatchRowMapper400"
class="com.batchinterface.dept.recordresultsvr.DojMatchRowMapper" />
<bean id="dojClassifierMatchReportWriter400"
class="org.springframework.batch.item.support.ClassifierCompositeItemWriter"
p:classifier-ref="dojMatchClassifier400">
</bean>
<bean id="dojMatchClassifier400"
class="com.batchinterface.dept.recordresultsvr.DojMatchReportClassifier"
p:itemWriterMatch400-ref="itemWriterMatch400"
p:itemWriterUnMatch400-ref="itemWriterUnMatch400"
p:lastRunDate-ref="LastSuccessfulRunDate400">
</bean>
<!-- End dojMainStep400 -->
<!-- End parallelProcessMatch -->