Description of problem:

I receive the NPE when I try to create XStream XML BatchExecutionHelper.newXStreamMarshaller().toXML(command);

To create the batch execution command I proceed:

Message mo = new Message();
mo.setText("ahoj");
InsertObjectCommand c = new InsertObjectCommand(mo, "message");
        
List<Command<?>> cmds = new ArrayList<Command<?>>();
Command insertObjectCommand = CommandFactory.newInsert(mo, "message", true, "DEFAULT"); // here I must set the DEFAULT entry point otherwise I get the NPE
cmds.add( insertObjectCommand );
cmds.add(CommandFactory.newFireAllRules());
		
BatchExecutionCommand command = CommandFactory.newBatchExecution(cmds, "ksession1");

Below is the stacktrace of NPE.

java.lang.NullPointerException
	at com.thoughtworks.xstream.io.xml.PrettyPrintWriter.writeText(PrettyPrintWriter.java:231)
	at com.thoughtworks.xstream.io.xml.PrettyPrintWriter.writeAttributeValue(PrettyPrintWriter.java:223)
	at com.thoughtworks.xstream.io.xml.PrettyPrintWriter.addAttribute(PrettyPrintWriter.java:218)
	at com.thoughtworks.xstream.io.WriterWrapper.addAttribute(WriterWrapper.java:41)
	at org.drools.core.runtime.help.impl.XStreamXML$InsertConverter.marshal(XStreamXML.java:116)

It should be enough to set "private String entryPoint = "DEFAULT";" in InsertObjectCommand

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