Spring Batch StoredProcedure problem

I am very new to Spring batch .
I am facing the below error when i am executing a sproc using org.springframework.batch.item.database.StoredProc edureItemReader

----
SEVERE: Encountered an error executing the step
org.springframework.batch.item.ItemStreamException : Failed to initialize the reader
at org.springframework.batch.item.support.AbstractIte mCountingItemStreamItemReader.open(AbstractItemCou ntingItemStreamItemReader.java:137)
at org.springframework.batch.item.support.CompositeIt emStream.open(CompositeItemStream.java:98)
at org.springframework.batch.core.step.tasklet.Taskle tStep.open(TaskletStep.java:288)
at org.springframework.batch.core.step.AbstractStep.e xecute(AbstractStep.java:193)
at org.springframework.batch.core.job.SimpleStepHandl er.handleStep(SimpleStepHandler.java:135)
at org.springframework.batch.core.job.flow.JobFlowExe cutor.executeStep(JobFlowExecutor.java:61)
at org.springframework.batch.core.job.flow.support.st ate.StepState.handle(StepState.java:60)
at org.springframework.batch.core.job.flow.support.Si mpleFlow.resume(SimpleFlow.java:144)
at org.springframework.batch.core.job.flow.support.Si mpleFlow.start(SimpleFlow.java:124)
at org.springframework.batch.core.job.flow.FlowJob.do Execute(FlowJob.java:135)
at org.springframework.batch.core.job.AbstractJob.exe cute(AbstractJob.java:281)
at org.springframework.batch.core.launch.support.Simp leJobLauncher$1.run(SimpleJobLauncher.java:120)
at org.springframework.core.task.SyncTaskExecutor.exe cute(SyncTaskExecutor.java:48)
at org.springframework.batch.core.launch.support.Simp leJobLauncher.run(SimpleJobLauncher.java:114)
at com.bofa.test.MainClass.main(MainClass.java:26)
Caused by: org.springframework.jdbc.UncategorizedSQLException : Executing stored procedure; uncategorized SQLException for SQL [{call PKG_TASK_FUNCTIONS.GET_CONFIG_VALUE(?, ?, ?, ?)}]; SQL state [99999]; error code [17041]; Missing IN or OUT parameter at index:: 2; nested exception is java.sql.SQLException: Missing IN or OUT parameter at index:: 2
at org.springframework.jdbc.support.AbstractFallbackS QLExceptionTranslator.translate(AbstractFallbackSQ LExceptionTranslator.java:83)
at org.springframework.jdbc.support.AbstractFallbackS QLExceptionTranslator.translate(AbstractFallbackSQ LExceptionTranslator.java:80)
at org.springframework.jdbc.support.AbstractFallbackS QLExceptionTranslator.translate(AbstractFallbackSQ LExceptionTranslator.java:80)
at org.springframework.batch.item.database.StoredProc edureItemReader.openCursor(StoredProcedureItemRead er.java:221)
at org.springframework.batch.item.database.AbstractCu rsorItemReader.doOpen(AbstractCursorItemReader.jav a:401)
at org.springframework.batch.item.support.AbstractIte mCountingItemStreamItemReader.open(AbstractItemCou ntingItemStreamItemReader.java:134)
... 14 more
Caused by: java.sql.SQLException: Missing IN or OUT parameter at index:: 2
at oracle.jdbc.driver.OraclePreparedStatement.process CompletedBindRow(OraclePreparedStatement.java:1821 )
at oracle.jdbc.driver.OraclePreparedStatement.execute Internal(OraclePreparedStatement.java:3571)
at oracle.jdbc.driver.OraclePreparedStatement.execute (OraclePreparedStatement.java:3677)
at oracle.jdbc.driver.OracleCallableStatement.execute (OracleCallableStatement.java:4714)
at oracle.jdbc.driver.OraclePreparedStatementWrapper. execute(OraclePreparedStatementWrapper.java:1374)
at org.apache.commons.dbcp.DelegatingPreparedStatemen t.execute(DelegatingPreparedStatement.java:169)
at org.springframework.batch.item.database.StoredProc edureItemReader.openCursor(StoredProcedureItemRead er.java:205)
... 16 more
-------------

Below is my code :

<bean id="SPItemReader" class="org.springframework.batch.item.database.Sto redProcedureItemReader">
<property name="procedureName" value="PKG_TASK_FUNCTIONS.get_config_value"/>

<property name="rowMapper">
<bean class="com......rowmapper.SPRowMapper"/>
</property>
<property name="dataSource" ref="dataSource"/>
<property name="parameters">
<list>
<bean class="org.springframework.jdbc.core.SqlParameter" >
<constructor-arg index="0" value="p_key" />
<constructor-arg index="1">
<util:constant static-field="java.sql.Types.VARCHAR" />
</constructor-arg>
</bean>
<bean class="org.springframework.jdbc.core.SqlParameter" >
<constructor-arg index="0" value="entity" />
<constructor-arg index="1">
<util:constant static-field="java.sql.Types.INTEGER" />
</constructor-arg>
</bean>
<bean class="org.springframework.jdbc.core.SqlParameter" >
<constructor-arg index="0" value="get_default_value" />
<constructor-arg index="1">
<util:constant static-field="java.sql.Types.BOOLEAN"/>
</constructor-arg>
</bean>
<bean class="org.springframework.jdbc.core.SqlOutParamet er">
<constructor-arg index="0" value="p_value" />
<constructor-arg index="1">
<util:constant static-field="java.sql.Types.VARCHAR"/>
</constructor-arg>
</bean>
</list>
</property>
<property name="preparedStatementSetter" ref="parameterSetter"/>
</bean>

My Storedproc syntax is below :
PROCEDURE get_config_value (
p_key config_key.NAME%TYPE,
entity entity.entity_id%TYPE,
get_default_value NUMBER,
key_value OUT VARCHAR2
);

Please help me in resolving this problem