Updating a row by rowid in oracle using spring-jdbc - oracle

Question

I have a weird problem updating a row by rowid in oracle using spring-jdbc.
The problem is that everything is ok but for some rowids the update will never be done and
application is frozen.
I changed spring log level to DEBUG to see what's happening but nothing's strange and spring log is exactly as successful updates.
I tried to execute the same sql in plsql and the update was executed successfully.
spring version is 3.1.1.RELEASE
oracle version is 11.1.0.6.0
body of update method in dao is:
String sql=
"UPDATE "+schema+".MSG m SET m.STATE="+state+" WHERE ROWID='"+msg.getRowId()+"'";
getJdbcTemplate().update(sql);
dao bean:
<bean id="messageDao" class="com.foo.dao.springjdbc.MessageDaoSpringJdbcImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"/>
</bean>
jdbcTemplate:
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg ref="dataSource"/>
</bean>
data source:
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:#${db.ip}:${db.port}:${db.sid}"/>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
<property name="validationQuery" value="select 1 from dual"/>
<property name="testOnBorrow" value="true"/>
<property name="testWhileIdle" value="true"/>
<property name="timeBetweenEvictionRunsMillis" value="5000"/>
<property name="numTestsPerEvictionRun" value="3"/>
<property name="maxActive" value="1"/>
<property name="maxIdle" value="3"/>
</bean>
any idea?