Just wanted to pass it on was trying to track down what was causing  parse error .
Here is  test case . I tried to  bisect but couldn't get it to compile on every revision. Most likely my set up .

But here is test case that is broken sometime after  5.3.0.CR1 . Please don't flame me if this is the wrong channel to send this too.

public void testParseSlashStarInString() {

        String str = "";
        str += "package org.drools \n";
        str += "import org.drools.Cheese \n";
        str += "dialect \"mvel\"\n";
        str += "rule rule1 \n";
        str += "  when \n";
        str += "    $c : Cheese() \n";
        str += " \n";
        str += "  then \n";
        str += "    Cheese hold= new Cheese(\"/*\",5);\n";
        str += "end\n";


        final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add(ResourceFactory.newByteArrayResource(str.getBytes()), ResourceType.DRL);
        StringBuffer stringBuffer = new StringBuffer();
        for (KnowledgeBuilderError e : kbuilder.getErrors()) {
            stringBuffer.append(e.toString());
        }
        Assert.assertEquals(stringBuffer.toString(), 0, kbuilder.getErrors().size());
)