Oozie EL function: An exception occured trying to convert String to type "java.lang.Double" -

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i trying run oozie workflow calls el function replaceall(). action that's using replaceall() this

  <action name="createsuccess">      <fs>          <configuration>              <property>                  <name>rundate</name>                  <value>${replaceall(hdfsdir, namenode + '/(.+)/' + region + '/([0-9\\-]+)/?', '$2')}</value>              </property>          </configuration>          <mkdir path="${namenode}/path/run/${region}/${rundate}"/>          <touchz path="${namenode}/path/run/${region}/${rundate}/success.txt"/>      </fs>      <ok to="end"/>      <error to="sendemailkill"/>   </action>

hdfsdir hdfs://namenode:8020/some/path/region/2015-04-22 , need grab date @ end property , use it.

but when run above action, got exception:

javax.servlet.jsp.el.elexception: exception occured trying convert string "hdfs://namenode:8020" type "java.lang.double"         @ org.apache.commons.el.logger.logerror(logger.java:481)         @ org.apache.commons.el.logger.logerror(logger.java:498)         @ org.apache.commons.el.logger.logerror(logger.java:566)         @ org.apache.commons.el.coercions.coercetoprimitivenumber(coercions.java:440)         @ org.apache.commons.el.coercions.applyarithmeticoperator(coercions.java:852)         @ org.apache.commons.el.arithmeticoperator.apply(arithmeticoperator.java:83)         @ org.apache.commons.el.binaryoperatorexpression.evaluate(binaryoperatorexpression.java:170)         @ org.apache.commons.el.functioninvocation.evaluate(functioninvocation.java:163)         @ org.apache.commons.el.expressionstring.evaluate(expressionstring.java:114)         @ org.apache.commons.el.expressionevaluatorimpl.evaluate(expressionevaluatorimpl.java:274)         @ org.apache.commons.el.expressionevaluatorimpl.evaluate(expressionevaluatorimpl.java:190)         @ org.apache.oozie.util.elevaluator.evaluate(elevaluator.java:203)         @ org.apache.oozie.command.wf.actionstartxcommand.execute(actionstartxcommand.java:175)         @ org.apache.oozie.command.wf.actionstartxcommand.execute(actionstartxcommand.java:60)         @ org.apache.oozie.command.xcommand.call(xcommand.java:280)         @ org.apache.oozie.service.callablequeueservice$compositecallable.call(callablequeueservice.java:326)         @ org.apache.oozie.service.callablequeueservice$compositecallable.call(callablequeueservice.java:255)         @ org.apache.oozie.service.callablequeueservice$callablewrapper.run(callablequeueservice.java:175)         @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)         @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)         @ java.lang.thread.run(thread.java:744)

any ideas why i'm getting exception , how fix it?

after trial error, figured out can not use "+" concatenate 2 strings. have use this:

${replaceall(hdfsdumpdir, concat(concat(concat(namenode, '/(.+)/'),  region), '/'), '')}

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