---------- Forwarded message ----------
From: Anirban Bandyopadhyay <Anirban.Bandyopadhyay@monitisegroup.com>
Date: 29 May 2012 13:36
Subject: [rules-users] DRL to XML transformation
To: "rules-users@lists.jboss.org" <rules-users@lists.jboss.org>

Hi,

We have a set of rule files in DRL format. We couldn’t find a way (tool) of importing them into Guvnor as BRL file so that we can edit using the designer.

We ended up using the DrlParser and XmlDumper to transform them from DRL to BRL. It produces the XML and when we add it to the repository using WebDav, Guvnor lists the files under Business Rule which is perfect. BUT when I try to open it, it throws the following error:

com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$Unkno

wnFieldException: No such field org.drools.ide.common.client.modeldriven.brl.Rul

eModel.rule-attribute

---- Debugging information ----

field : rule-attribute

class : org.drools.ide.common.client.modeldriven.brl.RuleModel

required-type : org.drools.ide.common.client.modeldriven.brl.RuleModel

converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionC

onverter

path : /rule/rule-attribute

version : null

-------------------------------

at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConv

erter.determineType(AbstractReflectionConverter.java:449)

at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConv

erter.doUnmarshal(AbstractReflectionConverter.java:290)

at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConv

erter.unmarshal(AbstractReflectionConverter.java:230)

at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshall

er.java:72)

at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(A

bstractReferenceUnmarshaller.java:65)

at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnm

arshaller.java:66)

at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnm

arshaller.java:50)

at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller

.java:134)

at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarsh

al(AbstractTreeMarshallingStrategy.java:32)

at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1035)

at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1019)

at com.thoughtworks.xstream.XStream.fromXML(XStream.java:895)

at com.thoughtworks.xstream.XStream.fromXML(XStream.java:886)

at org.drools.ide.common.server.util.BRXMLPersistence.unmarshal(BRXMLPer

sistence.java:191)

at org.drools.guvnor.server.contenthandler.drools.BRLContentHandler.retr

ieveAssetContent(BRLContentHandler.java:41)

at org.drools.guvnor.server.RepositoryAssetService.handlePackageItem(Rep

ositoryAssetService.java:132)

at org.drools.guvnor.server.RepositoryAssetService.loadRuleAsset(Reposit

oryAssetService.java:118)

at org.drools.guvnor.server.RepositoryAssetService$Proxy$_$$_WeldClientP

roxy.loadRuleAsset(RepositoryAssetService$Proxy$_$$_WeldClientProxy.java)

at org.drools.guvnor.server.RepositoryServiceServlet.loadRuleAsset(Repos

itoryServiceServlet.java:403)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:5

69)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(Remot

eServiceServlet.java:208)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(Remot

eServiceServlet.java:248)

at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(Ab

stractRemoteServiceServlet.java:62)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl

icationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF

ilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV

alve.java:233)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV

alve.java:191)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j

ava:127)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j

ava:102)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal

ve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav

a:293)

at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcesso

r.java:877)

at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.pr

ocess(Http11AprProtocol.java:594)

at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:16

75)

at java.lang.Thread.run(Thread.java:662)

I am able to re-produce the same error when I try to convert the BRL to DRL using BRDRLPersistence and BRXMLPersistence marshalling and unmarshalling. I checked that the field ‘rule-attribute’ is indeed not present in org.drools.brms.client.modeldriven.brl.RuleModel. when I look at the example brl file from the sample mortgage, they don’t have ‘rule-attribute’, and it’s not only that specific node, the whole set of node names are different.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>

public void convertDrlToBrl() throws IOException, DroolsParserException {

Resource fileResource = new ClassPathResource("Beneficiary_User_KYC_Level_3_Daily_Limit.drl");

DrlParser parser = new DrlParser();

XmlDumper dumper = new XmlDumper();

Reader source = new InputStreamReader(new FileInputStream(fileResource.getFile()));

PackageDescr pkg = parser.parse(source);

String xmlString = dumper.dump(pkg);

System.out.println(xmlString);

}

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

public void convertBrlToDrl() throws IOException {

Resource fileResource = new ClassPathResource("Beneficiary_User_KYC_Level_3_Daily_Limit_BRL.brl");

String fileAsString = FileUtils.readFileToString(fileResource.getFile());

BRDRLPersistence write = (BRDRLPersistence) BRDRLPersistence.getInstance();

BRXMLPersistence read = (BRXMLPersistence) BRXMLPersistence.getInstance();

RuleModel ruleModel = read.unmarshal(fileAsString);

String outputDRL = write.marshal(ruleModel);

System.out.println(outputDRL);

}

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Generated xml file:

===============================================

<rule-attribute name="dialect" value="mvel" />

<field-constraint field-name="kycLevel">

<literal-restriction evaluator="==" value="KYC_LEVEL_3" />

</field-constraint>

<field-constraint field-name="userType">

<literal-restriction evaluator="==" value="BENEFICIARY" />

</field-constraint>

</pattern>

<field-constraint field-name="type">

<literal-restriction evaluator="!=" value="TRANSACTION.SEND" />

</field-constraint>

</pattern>

</lhs><rhs> Limit fact0 = new Limit();

fact0.setType( "DAILY_TRANSACTION_LIMIT" );

fact0.setValue( 10000 );

fact0.setErrorMessage( "Maximum daily total amount of N10,000 exceeded for {0}." );

insert(fact0 );

</rhs>

</rule>

================================================

Am I doing something wrong? Is there a better way of converting the DRLs to BRLs?

Thanks in advance!

Anirban Bandyopadhyay

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