Weblogic JMS consumer - using XPath in selector with quotes - xpath

Question

I'm trying to subscribe to WebLogic JMS messages using selector containing XPath. In WebLogic, it's achieved using 'JMS_BEA_SELECT' function. Something like this:
session.createConsumer(topic, "JMS_BEA_SELECT('xpath', '/Parent/text()') = '123'");
This seem to work, but what if I need to use quotes in the expression? For example, how do I subscribe when my XPath expression is something like this (which is the only way to have namespace-insensitive query):
"//*[local-name()='Parent']/text()";
How do I specify single quotes of the above expression when I call createConsumer(topic, "WHAT GOES HERE?")?
Note that all the following variants didn't work (throw invalid expression exceptions):
"JMS_BEA_SELECT('xpath', '//*[local-name()=\\\"Parent\\\"]/text()') = '123'"
"JMS_BEA_SELECT('xpath', '//*[local-name()=\\\'Parent\\\']/text()') = '123'"
"JMS_BEA_SELECT('xpath', '//*[local-name()=\"Parent\"]/text()') = '123'"
"JMS_BEA_SELECT('xpath', '//*[local-name()=\'Parent\']/text()') = '123'"
EDIT:
Following the suggestion by #better_use_mkstemp, I tried using " and ' encoding. It doesn't throw exceptions, but it also doesn't select the message.
To be clear on the problem I'm having, below is the actual message I have in the queue:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ServiceResponseNotification xmlns="http://www.mywebsite.com/services/types">
<ServiceResponse>
<IsFailure>true</IsFailure>
</ServiceResponse>
<ServiceRequestId>2642697</ServiceRequestId>
</ServiceResponseNotification>
And here's the code fragment:
Hashtable ht = new Hashtable();
ht.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
ht.put(Context.PROVIDER_URL, "...");
Context jndiContext = new InitialContext(ht);
ConnectionFactory connectionFactory = (ConnectionFactory)jndiContext.lookup("jms/TestConnectionFactory");
Destination dest = (Destination) jndiContext.lookup("jms/TestJMSQueue");
Connection connection = connectionFactory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
String sel = "JMS_BEA_SELECT('xpath', '//*[local-name()=&apos;ServiceResponseNotification&apos;]/*[local-name()=&apos;ServiceRequestId&apos;]/text()') = '2642697'";
MessageConsumer consumer = session.createConsumer(dest, sel);
Message m = consumer.receive(1);
if (m != null) {
System.out.println(((TextMessage)m).getText());
} else {
System.out.println("No messages");
}
The above code returns null, no matter if I'm encoding quotes as " or as &apos;. The XPath above, when applied over this XML using regular XPath testing code - works fine.
Another option I thought of - is to use double single-quotes, which, for example, are suggested when using ApacheMQ (I didn't try it, but this doc says it's OK: http://activemq.apache.org/selectors.html). Both below variants don't throw exceptions, but also don't select the message:
"JMS_BEA_SELECT('xpath', '//*[local-name()=''Parent'']/text()') = '123'"
"JMS_BEA_SELECT('xpath', '//*[local-name()=''Parent'']/text()') = '123'"
Any help will be greatly appreciated.
Thank you.

Answer 1

A few things to note:
First your syntax for the variants you tried doesn't match your example that works... is it = or ==? Is it '123'") or '123')" ?
Second there is a fair amount of info out there about this, from the w3 xpath docs:
"To avoid a quotation mark in an expression being interpreted by the XML
processor as terminating the attribute value the quotation mark can be
entered as a character reference (" or ')"
Reference:
http://www.w3.org/TR/xpath/
http://bytes.com/topic/net/answers/178536-how-do-i-escape-single-tick-marks-xpath-queries
http://userscripts.org/topics/127322
http://kushalm.com/the-perils-of-xpath-expressions-specifically-escaping-quotes