Description:
If configured, expression for extracts is invalid because the input/output data does not have that particular value which is mentioned in the expression. The extracts feature in TIBCO BusinessWorks ProcessMonitor (BWPM) does not work due to the XPathException seen in TIBCO ActiveMatrix BusinessWorks logs.
Symptoms:

The following is the detailed stack trace of the exceptions:

  BW-EXT-LOG-100000 net.sf.saxon.trans.XPathException: XPath syntax error at char 20 in {/jms1:ActivityOutput/Body}:
    Prefix jms1 has not been declared
    at net.sf.saxon.expr.ExpressionParser.grumble(ExpressionParser.java:159)
    at net.sf.saxon.expr.ExpressionParser.makeNameCode(ExpressionParser.java:2236)
    at net.sf.saxon.expr.ExpressionParser.makeNameTest(ExpressionParser.java:2340)
    at net.sf.saxon.expr.ExpressionParser.parseNodeTest(ExpressionParser.java:1453)
    at net.sf.saxon.expr.ExpressionParser.parseBasicStep(ExpressionParser.java:1348)
    at net.sf.saxon.expr.ExpressionParser.parseStepExpression(ExpressionParser.java:1223)
    ....
    ....
    ....
    at net.sf.saxon.expr.ExpressionParser.parseOrExpression(ExpressionParser.java:415)
    at net.sf.saxon.expr.ExpressionParser.parseExprSingle(ExpressionParser.java:364)
    at net.sf.saxon.expr.ExpressionParser.parseExpression(ExpressionParser.java:316)
    at net.sf.saxon.expr.ExpressionParser.parse(ExpressionParser.java:238)
    at net.sf.saxon.expr.ExpressionTool.make(ExpressionTool.java:72)
    at net.sf.saxon.xpath.XPathEvaluator.createExpressionInternal(XPathEvaluator.java:202)
    at net.sf.saxon.xpath.XPathEvaluator.compile(XPathEvaluator.java:381)
    at com.faizsiegeln.njams.client.e.a(nJAMS:364)
    at com.faizsiegeln.njams.client.e.afterExecution(nJAMS:205)
    at com.tibco.pe.core.Job.a(Unknown Source)
    at com.tibco.pe.core.Job.a(Unknown Source)
    at com.tibco.pe.core.Job.k(Unknown Source)
    at com.tibco.pe.core.JobDispatcher$JobCourier.a(Unknown Source)
    at com.tibco.pe.core.JobDispatcher$JobCourier.run(Unknown Source)
--------------- linked to ------------------
javax.xml.xpath.XPathExpressionException

Cause:
When extracts are configured on the TIBCO BusinessWorks ProcessMonitor (BWPM) Server for a particular activity, as an input/output, if the expression provided for selection is wrong or does not have a result because the input/output file does not have that particular value which is mentioned in the expression, then the error is seen.

Extracts not working in TIBCO BusinessWorks ProcessMonitor and exceptions seen in TIBCO ActiveMatrix BusinessWorks application logs.

Correct the expression while configuring the extracts in TIBCO BusinessWorks ProcessMonitor (BWPM) Server such that it yields an output. That is, make sure that the expression provided is correct and has a valid result.