<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
  <property name="driverClassName">
    <value>com.mysql.jdbc.Driver</value>
  </property>
  <property name="url">
    <value>jdbc:mysql://x.x.x.x:3306/app
    </value>
  </property>
  <property name="username">
    <value>user1</value>
  </property>
  <property name="password">
    <value>pass1</value>
  </property>
</bean>

if [ $# -ne 2 ];then
echo "usage: argument 1:username 2:password"
exit 1
fi
USERNAME=$1
PASSWORD=$2


echo "Change values in config.xml..."

cat <<EOF >test.xml
<bean id="dataSource"
                  class="org.springframework.jdbc.datasource.DriverManagerDataSource">
            <property name="driverClassName">
                    <value>com.mysql.jdbc.Driver</value>
            </property>
            <property name="url">
                    <value>jdbc:mysql://x.x.x.x:3306/app
                    </value>
            </property>
            <property name="username">
                    <value>${USERNAME}</value>
            </property>
            <property name="password">
                    <value>${PASSWORD}</value>
            </property>
    </bean>

 EOF
 echo "Done."

xmlstarlet ed --inplace
  -u "//bean[@id='dataSource']//property[@name='password']/value"
  -v 'new_pass' source.xml

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
  <property name="driverClassName">
    <value>com.mysql.jdbc.Driver</value>
  </property>
  <property name="url">
    <value>jdbc:mysql://x.x.x.x:3306/app
    </value>
  </property>
  <property name="username">
    <value>user1</value>
  </property>
  <property name="password">
    <value>pass1</value>
  </property>
</bean>

<?xml version="1.0"?>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
  <property name="driverClassName">
    <value>com.mysql.jdbc.Driver</value>
  </property>
  <property name="url">
    <value>jdbc:mysql://x.x.x.x:3306/app
    </value>
  </property>
  <property name="username">
    <value>user1</value>
  </property>
  <property name="password">
    <value>new_pass</value>
  </property>
</bean>