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 name="Beneficiary_User_KYC_Level_3_Daily_Limit_BRL">
<rule-attribute name="dialect" value="mvel" />
<lhs><pattern object-type="UserBean" >
<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>
<pattern object-type="Activity" >
<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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