I am trying to set a service attribute's default value to null but I can't figure out how. Does anyone know if this is possible? Here is what I've tried so far:
Attempt 1
<service name="importGlAccounts" engine="java" location="com.hotwaxmedia.dsi.migration.MigrationServices" invoke="importGlAccounts" auth="true" transaction-timeout="14400">
<attribute name="glNumb" mode="IN" type="String" optional="true" default-value="null"/>
</service>
Attempt 2
<service name="importGlAccounts" engine="java" location="com.hotwaxmedia.dsi.migration.MigrationServices" invoke="importGlAccounts" auth="true" transaction-timeout="14400">
<attribute name="glNumb" mode="IN" type="String" optional="true" default-value="${groovy: null}"/>
</service>
Attempt 3
<service name="importGlAccounts" engine="java" location="com.hotwaxmedia.dsi.migration.MigrationServices" invoke="importGlAccounts" auth="true" transaction-timeout="14400">
<attribute name="glNumb" mode="IN" type="String" optional="true" default-value=""/>
</service>
Attempt 4
<service name="importGlAccounts" engine="java" location="com.hotwaxmedia.dsi.migration.MigrationServices" invoke="importGlAccounts" auth="true" transaction-timeout="14400">
<description>Import GL Accounts from Legacy Oracle.</description>
<attribute name="glNumb" mode="IN" type="String" optional="true">
<default-value>
<null xsi:nil="true"/>
</default-value>
</attribute>
</service>