jdbcTemplate with c3p0 hangs - c3p0

Question

I have a very simple test that works with dbcp connection pool and forever hangs with c3p0 (0.9.2).
private String query="select ROWID from SOMETABLE " +
" where rownum <= 100 for update skip locked";
private String deleteQuery = "delete from SOMETABLE where ROWID = ?";
public void retrieve() throws Exception {
while (retrieveChunk() > 0){
//do nothing
}
}
#Transactional
private int retrieveChunk(){
final List<Object[]> delPar = new ArrayList<Object[]>(100);
template.query(query, new RowCallbackHandler() {
public void processRow(ResultSet rs) throws SQLException {
String rowid = rs.getString(1);
delPar.add(new String[]{rowid});
}
});
template.batchUpdate(deleteQuery, delPar);
return delPar.size();
}
Spring context:
<bean id="connPool" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="user" value="**"/>
<property name="password" value="**"/>
<property name="driverClass" value="oracle.jdbc.driver.OracleDriver"/>
<property name="jdbcUrl" value="jdbc:oracle:thin:#****"/>
<property name="initialPoolSize" value="0"/>
<property name="maxPoolSize" value="10"/>
<property name="minPoolSize" value="1"/>
<property name="acquireIncrement" value="1"/>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg>
<ref bean="connPool"/>
</constructor-arg>
</bean>
What is wrong with c3p0 configuration?
Update - log4j output:
12:17:18,449 DEBUG JdbcTemplate:435 - Executing SQL query [select ROWID from SOMETABLE where rownum <= 100 for update skip locked]
12:17:18,465 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:18,809 DEBUG DataSourceUtils:327 - Returning JDBC Connection to DataSource
12:17:18,809 DEBUG JdbcTemplate:881 - Executing SQL batch update [delete from SOMETABLE where ROWID = ?]
12:17:18,824 DEBUG JdbcTemplate:570 - Executing prepared SQL statement [delete from SOMETABLE where ROWID = ?]
12:17:18,824 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:18,887 DEBUG JdbcUtils:362 - JDBC driver supports batch updates
12:17:18,902 DEBUG DataSourceUtils:327 - Returning JDBC Connection to DataSource
12:17:18,902 INFO PlainJdbcTableRetriever:36 - JdbcTemplateRetriever retrieve started
12:17:18,902 DEBUG JdbcTemplate:435 - Executing SQL query [select ROWID from SOMETABLE where rownum <= 100 for update skip locked]
12:17:18,902 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:18,934 DEBUG DataSourceUtils:327 - Returning JDBC Connection to DataSource
12:17:18,934 DEBUG JdbcTemplate:881 - Executing SQL batch update [delete from SOMETABLE where ROWID = ?]
12:17:18,934 DEBUG JdbcTemplate:570 - Executing prepared SQL statement [delete from SOMETABLE where ROWID = ?]
12:17:18,934 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:18,934 DEBUG JdbcUtils:362 - JDBC driver supports batch updates
12:17:18,934 DEBUG DataSourceUtils:327 - Returning JDBC Connection to DataSource
12:17:18,934 DEBUG JdbcTemplate:435 - Executing SQL query [select ROWID from SOMETABLE where rownum <= 100 for update skip locked]
12:17:18,934 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:18,981 DEBUG DataSourceUtils:327 - Returning JDBC Connection to DataSource
12:17:18,981 DEBUG JdbcTemplate:881 - Executing SQL batch update [delete from SOMETABLE where ROWID = ?]
12:17:18,981 DEBUG JdbcTemplate:570 - Executing prepared SQL statement [delete from SOMETABLE where ROWID = ?]
12:17:18,981 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:18,981 DEBUG JdbcUtils:362 - JDBC driver supports batch updates
12:17:18,996 DEBUG DataSourceUtils:327 - Returning JDBC Connection to DataSource
12:17:18,996 DEBUG JdbcTemplate:435 - Executing SQL query [select ROWID from SOMETABLE where rownum <= 100 for update skip locked]
12:17:18,996 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:19,012 DEBUG DataSourceUtils:327 - Returning JDBC Connection to DataSource
12:17:19,012 DEBUG JdbcTemplate:881 - Executing SQL batch update [delete from SOMETABLE where ROWID = ?]
12:17:19,012 DEBUG JdbcTemplate:570 - Executing prepared SQL statement [delete from SOMETABLE where ROWID = ?]
12:17:19,012 DEBUG DataSourceUtils:110 - Fetching JDBC Connection from DataSource
12:17:19,012 DEBUG JdbcUtils:362 - JDBC driver supports batch updates