Camunda engine-rest throws NoClassDefFoundError: org.joda.time.DateTime when attempting to use DueAfter/DueBefore filter on TaskService-TaskRequest-getTasks()

Getting NoClassDefFoundError in logs when running the following PHP code (using the Camunda PHP SDK):

$taskService = new \org\camunda\php\sdk\service\TaskService('http://localhost:8080/engine-rest');
$tr = new TaskRequest();
$start = "2014-04-26T23-00-00";
$tr->setDueAfter($start); /// works fine if this line is something other than a time-related field
$tasks = $taskService->getTasks($tr);

------

Camunda console output:

15:55:16,184 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/engine-rest].[org.camunda.bpm.engine.rest.impl.application.DefaultApplication]] (http-/127.0.0.1:8080-4) JBWEB000236: Servlet.service() for servlet org.camunda.bpm.engine.rest.impl.application.DefaultApplication threw exception: org.jboss.resteasy.spi.UnhandledException: java.lang.NoClassDefFoundError: org/joda/time/DateTime
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:365) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:233) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:209) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:557) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.3.5.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final.jar:1.0.2.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:47) [classes:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_51]
Caused by: java.lang.NoClassDefFoundError: org/joda/time/DateTime
at org.camunda.bpm.engine.rest.dto.converter.DateConverter.convertQueryParameterToType(DateConverter.java:23) [classes:]
at org.camunda.bpm.engine.rest.dto.converter.DateConverter.convertQueryParameterToType(DateConverter.java:19) [classes:]
at org.camunda.bpm.engine.rest.dto.AbstractQueryDto.setValueBasedOnAnnotation(AbstractQueryDto.java:106) [classes:]
at org.camunda.bpm.engine.rest.dto.AbstractQueryDto.<init>(AbstractQueryDto.java:63) [classes:]
at org.camunda.bpm.engine.rest.dto.task.TaskQueryDto.<init>(TaskQueryDto.java:115) [classes:]
at org.camunda.bpm.engine.rest.impl.TaskRestServiceImpl.getTasks(TaskRestServiceImpl.java:42) [classes:]
at sun.reflect.GeneratedMethodAccessor232.invoke(Unknown Source) [:1.7.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_51]
at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_51]
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211) [resteasy-jaxrs-2.3.5.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542) [resteasy-jaxrs-2.3.5.Final.jar:]
... 22 more
Caused by: java.lang.ClassNotFoundException: org.joda.time.DateTime from [Module "deployment.camunda-engine-rest-7.1.0-Final.war:main" from Service Module Loader]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190) [jboss-modules.jar:1.2.0.CR1]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468) [jboss-modules.jar:1.2.0.CR1]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456) [jboss-modules.jar:1.2.0.CR1]
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398) [jboss-modules.jar:1.2.0.CR1]
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120) [jboss-modules.jar:1.2.0.CR1]
... 36 more