[Mondrian] mondrian clear cache from other servlet

Martijn van den Broek martijn at basesoft.com
Wed Jul 10 05:08:38 EDT 2013

Hello fellow mondrians,

We are running Mondrian using XMLA (compiled current git master) in a
Tomcat 6 instance defined as following in web.xml:


Next to that in the same web.xml, we have our own XMLRPC servlet for
controlling various mondrian tasks like writing schema files and
controlling cache:


In that second xmlrpc servlet a clearCache method is defined which
accepts a mondrian connectionstring similar as the code below:

        String datasource_info =

        Connection conn = DriverManager.getConnection(datasource_info,
        PrintWriter pw = new PrintWriter(System.out, true);
        CacheControl cacheControl = conn.getCacheControl(pw);

        for (Cube cube : conn.getSchema().getCubes()) {
            CacheControl.CellRegion region =

            System.out.println("!! clearMemberCache: cache state before:");
            cacheControl.printCacheState(pw, region);


            System.out.println("!! clearMemberCache: cache state after:");
            cacheControl.printCacheState(pw, region);

            System.out.println("Cleared cache for cube '" +
cube.getName() + "'");

Now if an MDX query is executed against the XMLA server and then the
clearCache() method on the XMLRPC servlet is called, the cache state is
printed as empty. It is not possible to clear the mondrian cache this
way anymore. This code used to work in mondrian 3.5 but it seems the API
has changed. My guess is that I am requesting the mondrian connection
wrong due to the recent olap4j changes.

Any hints on how to get a proper connection? Any help is appreciated.

Kind regards,

Martijn van den Broek
BaseSoft Solutions B.V.

Herengracht 564
1017 CH Amsterdam
The Netherlands


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