Error using conditional branch node in OSB

Hi,
We are using Oracle Service Bus in our project. I have created the following steps in the OSB Proxy Service:
1) Assigning a value in a variable inside a request pipeline.
2) I am using a Conditional Branch after the pipelined pair. The branching will happen according to the value of that variable, I assigned in the pipelined pair.
Here we are getting an error in OSB test console:
The invocation resulted in an error: Unknown error while processing message for service ProxyService MHEducation/CCAuthorization/CCAuthorizationProxyService.
I am getting the following log in the console:
<Nov 5, 2009 6:14:04 PM IST> <Error> <OSB Kernel> <BEA-382016> <Failed to instantiate router for service ProxyService MHEducation/CCAuthorization/CCAuthorizationProxyService: com.bea.wli.sb.management.BrokerManagementException: com.bea.wli.
sb.stages.StageException: The xquery cannot have an unbound current node.com.bea.wli.sb.management.BrokerManagementException: com.bea.wli.sb.stages.StageException: The xquery cannot have an unbound current node.
at com.bea.wli.sb.pipeline.BranchNode.<init>(BranchNode.java:89)
at com.bea.wli.sb.pipeline.RouterCompiler.compileNode(RouterCompiler.java:129)
at com.bea.wli.sb.pipeline.RouterCompiler.compileFlow(RouterCompiler.java:115)
at com.bea.wli.sb.pipeline.Router.<init>(Router.java:135)
at com.bea.wli.sb.pipeline.RouterCompiler.compileRouter(RouterCompiler.java:89)
Truncated. see log file for complete stacktrace
com.bea.wli.sb.stages.StageException: The xquery cannot have an unbound currentnode.
at com.bea.wli.sb.stages.expressions.ExpressionHelper.validateXQuery(ExpressionHelper.java:481)
at com.bea.wli.sb.stages.expressions.ExpressionHelper.validate(ExpressionHelper.java:59)
at com.bea.wli.sb.stages.expressions.ExpressionHelper.getExecutor(ExpressionHelper.java:325)
at com.bea.wli.sb.stages.expressions.ExpressionBuilderImpl.getExecutor(ExpressionBuilderImpl.java:151)
at com.bea.wli.sb.stages.expressions.ExpressionBuilderImpl.getExecutor(ExpressionBuilderImpl.java:143)
Truncated. see log file for complete stacktrace
>
Any suggestion why am I getting the error?
Chandrachur.

check if your conditional branch uses quotes around the compaired value
so
/body/myinput = 'myvalue' instead of
/body/myinput = myvalue

Similar Messages

Conditional Branch Node in OSB

Hi There,
I'm trying to set a Conditional Branch in the beginning of my Proxy Service, i'm trying to compare to fields of the body, but when i build the xpath to compare this 2 fields i'm obtaining a compilation error.
My xpath line is :
fn:compare(./cre:Trace_PM/trac:Trace_PM/trac:traceLevel/text(), ./cre:Trace_PM/cre:Level/text())
And the error is :
XPath expression invalid, not a selection: declare namespace trac = 'http://www.ferrovial.es/XSD/Trace';
declare namespace cre = 'http://www.ferrovial.es/XSD/CreateTrace_PM';
declare namespace jca = 'http://www.bea.com/wli/sb/transports/jca';
declare namespace wsp = 'http://schemas.xmlsoap.org/ws/2004/09/policy';
declare namespace jms = 'http://www.bea.com/wli/sb/transports/jms';
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declare namespace tp = 'http://www.bea.com/wli/sb/transports';
declare namespace jejb = 'http://www.bea.com/wli/sb/transports/jejb';
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declare namespace dsp = 'http://www.bea.com/dsp/transport/sb';
declare namespace ejb = 'http://www.bea.com/wli/sb/transports/ejb';
declare namespace wsa = 'http://schemas.xmlsoap.org/ws/2004/08/addressing';
declare namespace bpel-10g = 'http://www.bea.com/wli/sb/transports/bpel10g';
declare namespace tuxedo = 'http://www.bea.com/wli/sb/transports/tuxedo';
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declare namespace ctx = 'http://www.bea.com/wli/sb/context';
declare namespace fn = 'http://www.w3.org/2004/07/xpath-functions';
declare namespace soap12-enc = 'http://www.w3.org/2003/05/soap-encoding';
declare namespace soap12-env = 'http://www.w3.org/2003/05/soap-envelope';
declare namespace fn-bea = 'http://www.bea.com/xquery/xquery-functions';
declare namespace ws = 'http://www.bea.com/wli/sb/transports/ws';
declare namespace soa-direct = 'http://www.bea.com/wli/sb/transports/soa';
declare namespace http = 'http://www.bea.com/wli/sb/transports/http';
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declare namespace ftp = 'http://www.bea.com/wli/sb/transports/ftp';
declare namespace sb = 'http://www.bea.com/wli/sb/transports/sb';
declare namespace xsd = 'http://www.w3.org/2001/XMLSchema';
declare namespace soap-enc = 'http://schemas.xmlsoap.org/soap/encoding/';
declare namespace xsi = 'http://www.w3.org/2001/XMLSchema-instance';
fn:compare(./cre:Trace_PM/trac:Trace_PM/trac:traceLevel/text(), ./cre:Trace_PM/cre:Level/text()).
I was checking in the forum and i found a similiar issue but i saw that it was not answered. Do you know which is the reason to this issue in conditional branchs on OSB?
Regards
Yuri

Hi Yuri,
From the OSB documentation -
Conditional branching is driven by a lookup table with each branch tagged with a simple, but unique, string value. A variable in the message context is designated as the lookup variable for that node, and at run time, its value is used to determine which branch to follow. If no branch matches the value of the lookup variable, the default branch is followed. You should design the proxy service in such a way that the value of the lookup variable is set before reaching the branch node.Does your case fulfill above criteria? Please let us know your use case in detail.
Regards,
Anuj

DMEE: Error in conditions for node Invcr: reference ID IDTP is not permitte

Hi Friends ,
I have problem with nodes in DMEE .
When child node is from a Exit funtion moduel , not from the Payment FPAYH/FPAYP/HX structures, is empty . I dont want the parent node to be displayed .
EX:
<INVCR> -
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empty/or values from Userexit.
I am using No mapping for parent nodes.
trying to give Reference ID for childnode and using it in parent node conditions and i guess using a lower level REFId is not permitted . My DMEE is giving following error.
Error in conditions for node Invcr: reference ID IDTP is not permitted
Message no. DMEE_ABA305
Diagnosis
You have specified type 3 in the conditions, meaning that the argument is a reference ID. Your entry in the argument field, however, is not an existing reference ID.
I did define the Reference NODE ID ,ID

Hello Srikanth,
The problem is with the semantics of the code you are writing.
Refer to the following code to get Account ID from the value node:
data: lv_account type string.
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or
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CALL METHOD lr_value_node->get_property_as_value
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DMEE - error in conditions for node: node attribute missing for ref. ID

Hi,
I've got an error 'error in conditions for node XXX: node attribute missing for ref. ID XXXXX' - may I kindly ask you to suggest where this attribute need to be specified.
thanks in advance.
BR
Renatas

Hi Renatas ,
When using Reference IDs for Conditioning in DMEE you should give node attribute in the 2nd field of the conditioning ....
look the below example
Arg1-1 Arg1-2 T O Arg2-1 Arg2-2 T O
E2E 1A 3 = SPACE 1
DMEE: node attribute as a comparison value
Definition
Node attribute to be used in a condition. The following values are possible:
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1A: contents in internal format
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4: counter reading of segments per file (only for DMEE format tree)
5: counter reading of segments with CR/LF (only for DMEE format tree)
Regards,
Komaravolu

Unable to use X Query function in the conditional branch of Proxy Service

Hi all,
I need to check the string length of a node then depending on that have to call two different business services. i have added a conditional branch inside
the proxy service. Now when I use the below expression in the I get an error
fn:string-length(./braz:BrazilianPropertyAddress/braz:postcode)
in variable i have given body
I am getting the following error
X path expression invalid not a selection declare namespace jca ="" ......................
If I give the expression without any stringlength function there is no problem
Kindly help

Hi Anuj,
Tried with text() its still throwing the same error
[BranchNode1] Conditional branch node specifies an invalid xpath: An error was reported compiling the XPath expression: XQuery exception: line 32, column 18: {err}XP0008 [{bea-err}XP0008a]: Variable "$body" used but not declared for expression: declare namespace jca = 'http://www.bea.com/wli/sb/transports/jca';
declare namespace wsp = 'http://schemas.xmlsoap.org/ws/2004/09/policy';
declare namespace jms = 'http://www.bea.com/wli/sb/transports/jms';
declare namespace tp = 'http://www.bea.com/wli/sb/transports';
declare namespace xs = 'http://www.w3.org/2001/XMLSchema';
declare namespace sftp = 'http://www.bea.com/wli/sb/transports/sftp';
declare namespace flow = 'http://www.bea.com/alsb/flow/transport';
declare namespace jpd = 'http://www.bea.com/wli/sb/transports/jpd';
declare namespace soap-env = 'http://schemas.xmlsoap.org/soap/envelope/';
declare namespace wsu = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd';
declare namespace dsp = 'http://www.bea.com/dsp/transport/sb';
declare namespace ejb = 'http://www.bea.com/wli/sb/transports/ejb';
declare namespace wsa = 'http://schemas.xmlsoap.org/ws/2004/08/addressing';
declare namespace bpel-10g = 'http://www.bea.com/wli/sb/transports/bpel10g';
declare namespace tuxedo = 'http://www.bea.com/wli/sb/transports/tuxedo';
declare namespace file = 'http://www.bea.com/wli/sb/transports/file';
declare namespace ctx = 'http://www.bea.com/wli/sb/context';
declare namespace fn = 'http://www.w3.org/2004/07/xpath-functions';
declare namespace soap12-enc = 'http://www.w3.org/2003/05/soap-encoding';
declare namespace soap12-env = 'http://www.w3.org/2003/05/soap-envelope';
declare namespace fn-bea = 'http://www.bea.com/xquery/xquery-functions';
declare namespace ws = 'http://www.bea.com/wli/sb/transports/ws';
declare namespace http = 'http://www.bea.com/wli/sb/transports/http';
declare namespace email = 'http://www.bea.com/wli/sb/transports/email';
declare namespace ftp = 'http://www.bea.com/wli/sb/transports/ftp';
declare namespace sb = 'http://www.bea.com/wli/sb/transports/sb';
declare namespace xsd = 'http://www.w3.org/2001/XMLSchema';
declare namespace soap-enc = 'http://schemas.xmlsoap.org/soap/encoding/';
declare namespace xsi = 'http://www.w3.org/2001/XMLSchema-instance';
declare namespace b = 'http://xmlns.oracle.com/B';
declare namespace add = 'http://schemas.xmlsoap.org/ws/2003/03/addressing';
fn:string-length($body/b:BProcessRequest/b:b/text())..

Extracting node value from XPath Expression in OSB Conditional Branch

HI All
While using conditional branch in OSB,i only get an XPath Expression editor to set a variable used to test a condition.
Now let's say my request is
<Body>
<exam:PersonSearchReq xmlns:exam="http://www.example.org">
<exam:RequestorSSO>James</exam:RequestorSSO>
</exam:PersonSearchReq>
</Body>
I write my XPath expression as :
./exam:PersonSearchReq/exam:RequestorSSO/text()
Now if I test this using the tester application , insted of getting node value 'James' ,i get the entire node element ,i.e
<exam:RequestorSSO xmlns:exam="http://www.example.org">James</exam:RequestorSSO>
Please suggest how can i extract the text value.
Regards,
Chinmay

Hi Guys
Actually it turns out that you need to populate In-Variable to function is correctly.As soon as i entere 'body' in it,it worked fine.
Thanks
Chinmay

Conditional branching in OSB

Hi,
I wan to use conditional branching in OSB for a WSDL WS.I am not able to use operationl branching because the method names and request message names are different.
I want to do conditional branching based on operations or request messages.
For example if operation name and request msgs are as below,
add , addRequest
minus , minusRequest
What should I give for the "Selected path" and "variable" in the condtions?
Thanks.

Can you paste the Message section please, where you are defining the Part of request and response.
The part should be element based and not type based for Operational Branching to work.
I did a test and its working correctly, Find the WSDL I used below:
<definitions
name="Test"
targetNamespace=
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xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:tns=
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xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:wsx=
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<types>
    <xsd:schema
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        "http://tempuri.org/OTN"
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      xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
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          <xsd:element maxOccurs="1" minOccurs="1" name="operand2"
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<xsd:element name="MinusRequest">
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<message name="addRequest">
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</message>
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</message>
<message name="Response1">
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</message>
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</message>
<portType name="Test">
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      <output message="tns:Response1"/>
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      <output message="tns:Response2"/>
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</portType>
<binding name="Test" type="tns:Test">
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</binding>
<service name="Test">
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Conditional Branching with quiz slides not working

Attempting to use conditional branches with quiz slidescauses
the other quiz slides in my presentation to not work correctly. I
am attempting to create a 'test-out' pre-quiz for a segment of
slides in the presentation. I followed the instructions to add
conditional branching per page 46 of the Breeze Presenter User
Guide to obviously no avail. Is there a simple straightfoward
manner in which someone has successfully used conditional branches
with their quiz slides in their presentation?

Hi,
I had the same issue.Apparently as of now PDF templates do not support conditional formatting for XML Publisher.
See Tim Dexter's response to my query at the bottom of this thread...
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OSB 11g - Conditional Branch Problem using attribute selection

Folks,
Came across a problem using OSB Conditional Branch using attribute selection, it fails & is most likely a bug. It was bug in ALSB2.5 but read in forums was fixed in ALSB 2.6
things I am doing -
1. In the Msg Flow, Conditional branch is @ the start of the flow
Xpath :- ./cm:processLineItem/cm:lineItem/@actionCode
In-Variable: - body
Label: - MODIFY
Operator:- =
Value:- 'Modify'
It fails with BEA-382000 error Code
<con:errorCode>BEA-382000</con:errorCode>
     <con:reason>
     com.bea.wli.sb.stages.StageException: {bea-err}TYPE003: Runtime Type Mismatch
     </con:reason>
What could be wrong with Xpath or is it a Bug ?
Thanks,
Abhijeet

Hi Abhijeet,
Your case is re-producible. It may be a bug.
BTW, I have noticed a strange behaviour -
1. If there is only one attribute then it works fine (<cus:lineItem actionCode="Modify")
2. If the attribute which you want to refer in selection, is in the last then also it works fine (<cus:lineItem priorityRanking="201" quantity="1"> actionCode="Modify")
So I will suggest you to raise a case with support and meanwhile as a workaround I would suggest you to use actionCode attribute in the last of lineItem node. So your XML should be like -
<soapenv:Body xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<cus:processLineItem xmlns:com="http://vodafone.com.au/ebo/vha/CommonComponents" xmlns:cus="http://vodafone.com.au/cm/ocv/ebm/CustomerOrder" xmlns:cus1="http://vodafone.com.au/ebo/vha/CustomerManagement">
<com:header>
<com:createDateTime>2008-09-29T11:49:45</com:createDateTime>

<com:webUser>test</com:webUser>
<com:channel>string</com:channel>
<com:applicationName>string</com:applicationName>
<com:businessIdentifier>string</com:businessIdentifier>

<com:entityIdentifier>string</com:entityIdentifier>

<com:sourceIdentifier>string</com:sourceIdentifier>

<com:statusCode>Success</com:statusCode>

<com:messageIdentifier>string</com:messageIdentifier>
</com:header>
<cus:lineItem priorityRanking="201" quantity="1" actionCode="Modify">


<cus1:product ID="string">

<cus1:attribute>
<com:name>test</com:name>
<com:value>test1</com:value>
</cus1:attribute>
</cus1:product>
</cus:lineItem>
</cus:processLineItem>
</soapenv:Body>
Regards,
Anuj

OSB 11g: Conditional Branch value will not accept string Value

OSB 11g 11.1.1.3.0 (OSB11_MAIN_GENERIC_100418.1323885)
When I edit a message flow and create a conditional branch I:
1. Enter an Xpath expression
2. Name the variable containing the XPath expression
3. Select an operator (=)
4. Enter a string value for Value: 'true'
5. Give the label a name (isMember)
6. Save my work
7. When I go back into the branch the 'true' value is gone and the Value field is blank.
If I enter a number it saves fine - only when I enter text with single quotes
is this a known bug?

Thank you, however I still think this is a bug because:
1. Version 10g training materials has this example as a lab exercise and says in particular 'make sure to place single quotes around the text string: 'true')
2. The documentation for 11g says to enter a value but does not say it cannot be a 'string'
3. If I don't enter any value for the value field, when I click Save it indicates an error -the field cannot be empty. When I place a numeric in the field(unquoted) I can save it and return to it and the numeric value is still there. If I enter a 'quoted string' I can save it but when I return to it, it is gone
4. If I enter the same information using the eclipse IDE I can see the 'quoted string' is saved and when I view it (not edit but view) in the web IDE (sbconsole) I can see the 'quoted string'. If I edit it the string disappears.
I will continue to test. While you may be correct and the intent is to accept only numerics, that does not make sense to me. Why not allow simple and fast conditional branching based on text string values in a message? I know I can use other mechanisms to achieve the same goal: a routing table would work also.
My point was the behavior of the UI implies a bug.
Edited by: jo**** on Nov 21, 2010 8:44 AM

OSB conditional branches

Hi,
I have problem with conditional branches in OSB.
I have 2 business services and 1 proxy service which route message to one of 2 business services.
Conditional branch look like this:
XPath: ./ter:process/ter:provider
In Variable: provider
TerminalKingBranch look like this:
Label: TerminalKing
Operator: =
Value: "King"
Message is never routed by TerminalKingBranch even message is <ter:process><ter:provider>King</ter:provider></ter:process>
I try repalce double quotes with single quotes without effect.
Message is always routed by Default route node.
Please help.
Thanks.

<?xml version="1.0" encoding="UTF-8" ?>
<schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://xmlns.oracle.com/project/TerminalService/TerminalService"
xmlns:tns="http://xmlns.oracle.com/project/TerminalService/TerminalService"
xmlns="http://www.w3.org/2001/XMLSchema">
<element name="process">
<complexType>
<sequence>
<element name="provider" type="string"/>
<element name="serviceId" type="decimal"/>
<sequence>
<element name="param1" type="string"/>
<element name="param2" type="string"/>
<element name="param3" type="string"/>
</sequence>
</sequence>
</complexType>
</element>
<element name="processResponse">
<complexType>
<sequence>
<element name="status" type="string"/>
</sequence>
</complexType>
</element>
</schema>
This is View Stage Configuration : Route Node
Route to [ TerminalService ] invoking [ process ]
Request Actions:
Assign [ XQuery Resource... ]
XQuery Resource: Project/Processes/TerminalService/TerminalServiceRequest Variable Names And Bindings: source - $body/ter:process
to [ transformedRequest ]
Replace [ node contents ] of [ . ]
in [ body ] with [ $transformedReq... ]
$transformedRequest
Response Actions:
Assign [ XQuery Resource... ]
XQuery Resource: Project/Processes//TerminalService/TerminalServiceResponse Variable Names And Bindings: sourceProcessResponse - $body/ter:processResponse
to [ transformedResponse ]
Replace [ node contents ] of [ . ]
in [ body ] with [ $transformedRes... ]
Edited by: Peter551059 on Jun 9, 2011 11:34 PM

OSB Conditional Branch

Hi all,
Is it possible to compare the conditional variable in the conditional branch to multiple values per sub branches?
For ex. I have a "Conditional Branch In Variable: types" then in Branch1 I will compare like"types IN ('type a','type b','type c')" then in Branch2 I will compare it like "types IN ('type x',type 'type y',type 'z')"
Is this possible?

Not possible directly at the Conditional branch since the 'Value' column takes a string value to compare with.
To achieve this you will need to do the following:
In the service add a pipeline pair BEFORE the conditional branch.
In the request pipeline add a stage.
In the stage add an assign action to create a lookup variable (this lookup variable will be using in the conditional branch)
The XQuery expression in Assign Action should be like this(adjust for your request structure):
for $type in $body/request/type
return
if ((data($type) = 'a') or (data($type) = 'b') or (data($type) = 'c'))
then
<BranchValue>branch1</BranchValue>
else if ((data($type) = 'x') or (data($type) = 'y') or (data($type) = 'z'))
then
<BranchValue>branch2</BranchValue>
else ()
Now use the value of lookup variable in the conditional branch to compare against 'branch1' or 'branch2' as values.
XPath should be ./text()

SSL error using Neutron API and CLI directly on controller nodes

VIO 1.0 + NSX + vSphere 6.0
I am trying to execute the following segment of code:
139         credentials = get_credentials()
140         neutron = client.Client('2.0',
141                                 username=credentials['username'],
142                                 password=credentials['password'],
143                                 auth_url=credentials['auth_url'],
144                                 tenant_name=credentials['tenant_name'],
145                                 endpoint_url=credentials['url'],
146                                 token=credentials['token'],
147                                 insecure=True)
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File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 306, in list_ports
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File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1263, in _pagination
    res = self.get(path, params=params)
File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1236, in get
    headers=headers, params=params)
File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1221, in retry_request
    headers=headers, params=params)
File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1156, in do_request
    resp, replybody = self.httpclient.do_request(action, method, body=body)
File "/usr/lib/python2.7/dist-packages/neutronclient/client.py", line 192, in do_request
    **kwargs)
File "/usr/lib/python2.7/dist-packages/neutronclient/client.py", line 148, in _cs_request
    raise exceptions.SslCertificateValidationError(reason=e)
neutronclient.common.exceptions.SslCertificateValidationError: SSL certificate validation has failed: [Errno 1] _ssl.c:510: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
The /var/log/neutron/server.log file has the following corresponding entry for when the script tries to make the connection:
2015-04-11 07:17:31.941 2096 INFO neutron.wsgi [-] (2096) accepted ('10.27.16.164', 34495)
When I run the CLI from the same controller node, I get the error with or without the —insecure flag:
root@controller02:/tmp# neutron port-list
SSL certificate validation has failed: [Errno 1] _ssl.c:510: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
root@controller02:/tmp# neutron --insecure port-list
SSL certificate validation has failed: [Errno 1] _ssl.c:510: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
If I run the neutron CLI command from my local Macbook Pro, it works just fine. That leads me to believe it is a communication error when the controller node tries to talk to itself. I have tried setting the OS_AUTH_URL and OS_URL to both the localhost IP and the 10-network IP address -- both result in the same error.
Any ideas?
Chris

Hello Chris,
Thanks for checking out VMware Integrated OpenStack and for sharing your concern.
By default, VMware Integrated OpenStack uses a self-signed certificate, which will require the use of the OS_CACERT environment variable in your openrc file and when using the API.
The better way to resolve this is to use a CA-signed certificate. Fortunately, VMware Integrated OpenStack makes the CSR generation and signed certificate import process very easy.
If this is production, of course, use a trusted Root CA. If this is a Dev Lab, you can generate your own Root CA certificate and use it for testing.
I wrote up a quick blog post on how to do this.
Let us know if you have any further questions.
Regards,
Trevor

Getting error in call library node when establishing communication with MAX1452 on serial port using dll

I want to communicate with MAX1452 in labview on PC serial port. Maxim provides dll file which has functions to communicate with device.It says first two functions should be findcom port and initialization sequence where findcom port returns PC's serial port address while initialization sequence helps device to learn baud rate.Iam not getting exception error in call library node.i have kept dll file in the same location as VI.

Labview verison is 7.1 and os is win xp.
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I'd put dll in the same directory where the code resides.
Attachments:
Code.vi ‏23 KB

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The main difficulty I am facing is to fetch the plain text value (which will be used to choose the branch) from an xml node using XPath.
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