com.sun.star.uno.RuntimeException "Could not create system bitmap!"

Hi,

I run LibreOffice dev version 4.4.4.0.0+ Build ID: d276993a1b60f66ce4322c29709c0c3907977663 in a headless mode - soffice.exe -accept="socket,host=0.0.0.0,port=8100;urp;StarOffice.ServiceManager" -headless -nodefault -nofirststartwizard -nolockcheck -nologo -norestore

A separate web app requests a conversion of file.docx to file.pdf followed by a print command and I got (for now just one time):

Caused by: com.sun.star.uno.RuntimeException: Could not create system bitmap!
	at com.sun.star.lib.uno.environments.remote.Job.remoteUnoRequestRaisedException(Job.java:161)
	at com.sun.star.lib.uno.environments.remote.Job.execute(Job.java:125)
	at com.sun.star.lib.uno.environments.remote.JobQueue.enter(JobQueue.java:319)
	at com.sun.star.lib.uno.environments.remote.JobQueue.enter(JobQueue.java:288)
	at com.sun.star.lib.uno.environments.remote.JavaThreadPool.enter(JavaThreadPool.java:80)
	at com.sun.star.lib.uno.bridges.java_remote.java_remote_bridge.sendRequest(java_remote_bridge.java:619)
	at com.sun.star.lib.uno.bridges.java_remote.ProxyFactory$Handler.request(ProxyFactory.java:142)
	at com.sun.star.lib.uno.bridges.java_remote.ProxyFactory$Handler.invoke(ProxyFactory.java:123)
	at com.sun.proxy.$Proxy122.print(Unknown Source)
	at com.as.beacons.srv.cmd.util.office.impl.OfficeMgrImpl.printDocument(OfficeMgrImpl.java:417)
	at com.as.beacons.srv.cmd.util.office.impl.OfficeMgrImpl.convert(OfficeMgrImpl.java:166)

The document is a simple one containing only text.
The exception is thrown on the last line of the following code:

XPrintable xPrintable = UnoRuntime.queryInterface(XPrintable.class, document);
Map<String, Object> props = new HashMap<String, Object>();
props.put("Name", printerName);
xPrintable.setPrinter(toUnoProperties(props));
props.clear();
props.put("Wait", true);
props.put("CopyCount", copyCount);
xPrintable.print(toUnoProperties(props));

What could be the reason for this exception?
I couldn’t find any information on the web or in libreoffice forums.