3:44 p.m.
Ok, I have read the documentation like a million times. I have looked at all
the examples. Yet I still can not figure out how to add a fact to the drools
server ksession1 from a web application or a java application. I have got
the server to work. I have even got the soapUI to work. now I want to add a
fact from my own client.
My issue is that I need to add a facts that has maps and list in the pojo.
how can I just add the pojo to the ksession1? Is there an example that is
out there that I have not found?
It seems simple, but I just do not understand... can someone provide some
additional help, please?
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12:11 p.m.
Update:
So I have the following as code that I found in a blog by salaboy...
List<String> myDomainClasses = new ArrayList<String>();
myDomainClasses.add("com.test.TestFact");
// I need to create a JAXB context including my domain classes
// to be able to create a JAXB representation to send to the server
JAXBContext jaxbContext =
DroolsJaxbContextHelper.createDroolsJaxbContext(myDomainClasses, null);
TestFact test = new TestFact();
// Once I get my object I need to create
// some commands to execute on the server
// Here I include a reference to the session that
// I define in my Knowledge Context Profile
List<Command> listOCommand = new ArrayList<Command>();
listOCommand.add(new InsertObjectCommand(test, "testFact"));
BatchExecutionCommand cmd = CommandFactory.newBatchExecution(listOCommand,
"ksession1");
// Once I get all I need to send to the server,
// I need to use the JAXB context
// to obtain the JAXB representation.
StringWriter xmlReq = new StringWriter();
javax.xml.bind.Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty("jaxb.formatted.output", true);
marshaller.marshal(cmd, xmlReq);
// I create a HTTPClient to interact with the
// server via REST (HTTP POST)
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpParams params = new BasicHttpParams();
params.setParameter(ClientPNames.DEFAULT_HOST, "localhost");
//Print the JAXB xml that we will send to the server
System.out.println(xmlReq.toString());
// Send the Commands JAXB representation to the server for execution
HttpPost postMethod = new
HttpPost("http://localhost:8080/MyService/kservice/rest/execute");
HttpParams p = new BasicHttpParams();
p.setParameter("command", xmlReq.toString());
postMethod.setParams(p);
HttpResponse response = httpClient.execute(postMethod);
System.out.println(response);
Now I had to change a few things from the blog but it should be basically
the same as the post... I get the following exception...
1872701 [http-8080-1] ERROR processor.DefaultErrorHandler - Failed delivery
for exchangeId: 839c6b11-3c2a-4106-9118-56417edfbab1. Exhausted after
delivery attempt: 1 caught: java.io.IOException: "null" doesnt contain
ObjectFactory.class or jaxb.index
java.io.IOException: "null" doesnt contain ObjectFactory.class or jaxb.index
at org.apache.camel.util.IOHelper.createIOException(IOHelper.java:80)
at org.apache.camel.util.IOHelper.createIOException(IOHelper.java:72)
at
org.apache.camel.converter.jaxb.JaxbDataFormat.unmarshal(JaxbDataFormat.java:151)
at
org.apache.camel.processor.UnmarshalProcessor.process(UnmarshalProcessor.java:51)
Thanks for any advice on this matter...
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4:26 a.m.
The error message suggests to me that there is no class ObjectFactory, or
not where it ought to be, for JAXB to be happy. If you JAXB-annotate your
Java classes by hand, you'll also have to write an ObjectFactory.java.
A little info can be found in my JAXB
tutorial<http://jaxb.java.net/tutorial/section_6_2_4-The-Object-Factor...;.
Also, you could apply xjc to an XML Schema to learn how it's done ;-)
-W
On 2 August 2011 19:11, kkelleyjr <karl.kelley.jr(a)gmail.com> wrote:
Update:
So I have the following as code that I found in a blog by salaboy...
List<String> myDomainClasses = new ArrayList<String>();
myDomainClasses.add("com.test.TestFact");
// I need to create a JAXB context including my domain classes
// to be able to create a JAXB representation to send to the server
JAXBContext jaxbContext =
DroolsJaxbContextHelper.createDroolsJaxbContext(myDomainClasses, null);
TestFact test = new TestFact();
// Once I get my object I need to create
// some commands to execute on the server
// Here I include a reference to the session that
// I define in my Knowledge Context Profile
List<Command> listOCommand = new ArrayList<Command>();
listOCommand.add(new InsertObjectCommand(test, "testFact"));
BatchExecutionCommand cmd = CommandFactory.newBatchExecution(listOCommand,
"ksession1");
// Once I get all I need to send to the server,
// I need to use the JAXB context
// to obtain the JAXB representation.
StringWriter xmlReq = new StringWriter();
javax.xml.bind.Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty("jaxb.formatted.output", true);
marshaller.marshal(cmd, xmlReq);
// I create a HTTPClient to interact with the
// server via REST (HTTP POST)
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpParams params = new BasicHttpParams();
params.setParameter(ClientPNames.DEFAULT_HOST, "localhost");
//Print the JAXB xml that we will send to the server
System.out.println(xmlReq.toString());
// Send the Commands JAXB representation to the server for execution
HttpPost postMethod = new
HttpPost("http://localhost:8080/MyService/kservice/rest/execute");
HttpParams p = new BasicHttpParams();
p.setParameter("command", xmlReq.toString());
postMethod.setParams(p);
HttpResponse response = httpClient.execute(postMethod);
System.out.println(response);
Now I had to change a few things from the blog but it should be basically
the same as the post... I get the following exception...
1872701 [http-8080-1] ERROR processor.DefaultErrorHandler - Failed
delivery
for exchangeId: 839c6b11-3c2a-4106-9118-56417edfbab1. Exhausted after
delivery attempt: 1 caught: java.io.IOException: "null" doesnt contain
ObjectFactory.class or jaxb.index
java.io.IOException: "null" doesnt contain ObjectFactory.class or
jaxb.index
at
org.apache.camel.util.IOHelper.createIOException(IOHelper.java:80)
at
org.apache.camel.util.IOHelper.createIOException(IOHelper.java:72)
at
org.apache.camel.converter.jaxb.JaxbDataFormat.unmarshal(JaxbDataFormat.java:151)
at
org.apache.camel.processor.UnmarshalProcessor.process(UnmarshalProcessor.java:51)
Thanks for any advice on this matter...
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5:13 p.m.
Thank you for the response... Unfortunately, I have read this and still kinda
lost on what any of that means... Is there an example with drools that I can
look at to help me see this a little better?
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5:59 a.m.
So you did not create the classes defining the XML structure from an XMl
schema using xjc?
You might get around this by adding, to each package where one of those
files is located, a file called jaxb.index containing a newline separated
list of class names relative to the very same containing package. So, if you
have a class a.b.c.Doo, the jaxb.index in a.b.c contains a line "Foo". See
the javadoc for javax.xml.bind.JAXBContext.
Try to marshal your object locally by creating a JAXBContext, a Marshaller
from it, and marshal to System.out.
-W
On 6 August 2011 00:13, kkelleyjr <karl.kelley.jr(a)gmail.com> wrote:
Thank you for the response... Unfortunately, I have read this and
still
kinda
lost on what any of that means... Is there an example with drools that I
can
look at to help me see this a little better?
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5:31 p.m.
No I did not use xjc to create the classes from an XML structure... I had
code that was working and I wanted to create a web based client or an
application to add fact to my drools server...
I did print out what is being marshaled...
<?xml version="1.0" encoding="UTF-8"
standalone="yes"?>
<batch-execution lookup="ksession1">
<insert disconnected="false" return-object="true"
out-identifier="testFact">
<msg>blah</msg>
</insert>
<fire-all-rules max="-1"/>
</batch-execution>
the object:
public class Message {
String msg;
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
This object is a little different from the original post... The reason is
that when I get this thing to work I am going to do some documentation and
create a end-to-end beginner example... Because, I can not find a full
example to help me through this... and I will give it to you guys...
I will keep working, and any advice on what to try is appreciated...
Thanks
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5:36 p.m.
I posted that before I was done... oops... here is the class I have to call
the drools server...
private static void sendMessage() throws ClassNotFoundException,
JAXBException, PropertyException, IOException,
ClientProtocolException {
List<String> myDomainClasses = new ArrayList<String>();
myDomainClasses.add("com.koder.example.facts.Message");
// I need to create a JAXB context including my domain classes
// to be able to create a JAXB representation to send to the server
jaxbContext =
DroolsJaxbContextHelper.createDroolsJaxbContext(myDomainClasses, null);
Message test = new Message();
test.setMsg("blah");
// Once I get my object I need to create
// some commands to execute on the server
// Here I include a reference to the session that
// I define in my Knowledge Context Profile
List<Command> listOCommand = new ArrayList<Command>();
Command insertObjectCommand = CommandFactory.newInsert(test, "testFact",
true, null);
Command fireRules = new FireAllRulesCommand();
listOCommand.add(insertObjectCommand);
listOCommand.add(fireRules);
BatchExecutionCommand cmd =
CommandFactory.newBatchExecution(listOCommand, "ksession1");
// Once I get all I need to send to the server,
// I need to use the JAXB context
// to obtain the JAXB representation.
StringWriter xmlReq = new StringWriter();
javax.xml.bind.Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty("jaxb.formatted.output", true);
marshaller.marshal(cmd, xmlReq);
// I create a HTTPClient to interact with the
// server via REST (HTTP POST)
DefaultHttpClient httpClient = new DefaultHttpClient();
//Print the JAXB xml that we will send to the server
System.out.println("XML:\n" + xmlReq.toString() );
HttpPost postMethod = new
HttpPost("http://localhost:8080/drools-server/kservice/rest");
// HttpParams p = new BasicHttpParams();
// p.setParameter("execute", xmlReq.toString());
// postMethod.setParams(p);
//
StringEntity entity = new StringEntity(xmlReq.toString());
entity.setContentType("text/plain"); //"application/xml"
postMethod.setEntity(entity);
// HttpClientParams.setRedirecting(postMethod.getParams(), false);
HttpResponse response = httpClient.execute(postMethod);
System.out.println(response);
}
the comments are left in from the original code from salaboy's post...
the message that I get back is:
HTTP/1.1 404 Not Found [Server: Apache-Coyote/1.1, Allow: POST,OPTIONS,
Date: Tue, 09 Aug 2011 22:35:36 GMT, Content-Type: text/xml, Content-Length:
0]
trying to figure out what went wrong...
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4:05 p.m.
try adding /execute to your URL, i.e.
..../drools-server/kservice/rest/execute
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4:22 p.m.
I have already tried that... I got HTTP/1.1 204 No Content [Server:
Apache-Coyote/1.1, Date: Wed, 10 Aug 2011 21:21:45 GMT]...
Thank you for the advice...
I have been thinking that it may have something to do with xstream and jaxb
stuff, but I am very new to both tech's...
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4:47 p.m.
I got the 5.2 drools-server working with xstream. You can see my code here:
http://drools.46999.n3.nabble.com/rules-users-how-to-invoke-rest-service-...
at the time of that post, i hadn't figured out how to get the return
objects. this post covers how to do that:
http://drools.46999.n3.nabble.com/drools-server-empty-response-body-td319...
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5:06 p.m.
Thank You I had been looking at your post actually, trying to understand the
difference between the two technologies... I will take a look at the xstream
and will post if I figure out what the issue is with the jaxb...
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5:54 p.m.
I was looking at you code and I was wondering if there is a reason that you
did not use the new httpcomponents for the httpclient?
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6:07 p.m.
No reason - I used the old HttpClient because I'm familiar with it.
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6:26 p.m.
Well after modifying some of the code that you gave and setting the drools
server back to using xstream... so basically, the exact code that I posted
but with the xstream marshaller... the code works... so I am very confused
with what the deal is with the jaxb situation????
I would think maybe that it has something to do with how to configure the
drools server for jaxb correctly???
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12:52 p.m.
I have progressed with this a little further, however I am wondering if
anyone know of an end to end example using drools server and jsp web
interfaces to display what is in the knowledge base and add to the knowledge
base...
I got the httpclient to work, but I am looking for what the suggested design
pattern and best practices are for using drools server with the web.
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14 comments
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participants (3)
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kkelleyjr -
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Wolfgang Laun