Unable to parse web.xml

STEP: create project without JAX-RS enabled STEP: in web.xml insert: <!-- <servlet-mapping> <servlet-name>javax.ws.rs.core.Application</servlet-name> <url-pattern>/hello/*</url-pattern> </servlet-mapping> STEP: add JAX-RS support into the project FAIL: error is logged: org.xml.sax.SAXParseException; lineNumber: 8; columnNumber: 11; XML document structures must start and end within the same entity. at org.apache.xerces.parsers.DOMParser.parse(Unknown Source) at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source) at org.jboss.tools.ws.jaxrs.core.internal.utils.WtpUtils.evaluateXPathExpression(WtpUtils.java:227) at org.jboss.tools.ws.jaxrs.core.internal.utils.WtpUtils.getApplicationPath(WtpUtils.java:90) at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.ResourceChangedProcessor.preprocessApplicationChangesOnWebxmlAdditionOrChange(ResourceChangedProcessor.java:238) at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.ResourceChangedProcessor.processApplicationChangesOnWebxmlAdditionOrChange(ResourceChangedProcessor.java:208) at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.ResourceChangedProcessor.processEvent(ResourceChangedProcessor.java:192) at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.ResourceChangedProcessor.processEntireProject(ResourceChangedProcessor.java:111) at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.ResourceChangedProcessor.processAffectedResources(ResourceChangedProcessor.java:84) at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.ResourceChangedBuildJob.run(ResourceChangedBuildJob.java:67) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)