[rules-users] Drools as a Webservice
Geoffrey De Smet
ge0ffrey.spam at gmail.com
Mon Apr 30 05:18:21 EDT 2012
Alternatively, have you take a look at the drools-camel-server-example?
http://docs.jboss.org/drools/release/5.4.0.CR1/droolsjbpm-integration-docs/html_single/index.html#d0e666
Op 30-04-12 10:13, abhinavgupta schreef:
> Hi,
>
> I am new to the Drools , i wanted to expose rules as a webservice using
> Axis2.
>
> what i have done is that
> 1. I have created a drools Project (working fine on eclispe) export all
> files in jar
> 2. Placed the jar file in C:\Program Files\Apache Software Foundation\Tomcat
> 7.0\webapps\axis2\WEB-INF\lib directory
> 3. Created a new Dynamic java project with axis2 facet.created a class with
>
>
> **
>
> package in.abhi.ws;
>
>
> import java.math.BigDecimal;
>
> import org.drools.KnowledgeBase;
> import org.drools.KnowledgeBaseFactory;
> import org.drools.builder.KnowledgeBuilder;
> import org.drools.builder.KnowledgeBuilderError;
> import org.drools.builder.KnowledgeBuilderErrors;
> import org.drools.builder.KnowledgeBuilderFactory;
> import org.drools.builder.ResourceType;
> import org.drools.io.ResourceFactory;
> import org.drools.runtime.StatefulKnowledgeSession;
>
>
> import com.sample.SaleItem;
>
>
> public class Test {
>
> private static KnowledgeBase readKnowledgeBase() throws Exception {
>
> KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
> .newKnowledgeBuilder();
> kbuilder.add(ResourceFactory.newClassPathResource("KanasSalesTax.drl"),
> ResourceType.DRL);
>
> KnowledgeBuilderErrors errors = kbuilder.getErrors();
> if (errors.size()> 0) {
> for (KnowledgeBuilderError error : errors) {
> System.err.println(error);
> }
> throw new IllegalArgumentException("Could not parse knowledge.");
> }
> KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
> kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
> return kbase;
> }
>
>
>
> public BigDecimal salesTax(String taxState, String typeItem) {
> BigDecimal taxCal = null;
> try {
> // load up the knowledge base
> KnowledgeBase kbase = readKnowledgeBase();
> StatefulKnowledgeSession ksession = kbase
> .newStatefulKnowledgeSession();
>
> // Non-prescription item
> // Expect $1.89 for the tax
>
> SaleItem item1 = new SaleItem();
>
> item1.setPurchaseState(taxState);
> item1.setItemType(typeItem);
> item1.setSalesPrice(new BigDecimal(29.95));
> ksession.insert(item1);
> ksession.fireAllRules();
>
> taxCal = item1.getSalesTax();
>
> System.out.println(item1.getPurchaseState().toString() + " "
> + item1.getItemType().toString() + ": "
> + item1.getSalesTax().toString());
> } catch (Throwable t) {
> t.printStackTrace();
> }
> return taxCal;
> }
> }
>
>
> **
> 4. Then created a bottom up java bean webservice of it using the same above
> class.
> 5. Wsdl is generated
>
>
> i am getting the error response on eclispe console while testing by soap-ui
>
> **********
>
>
> java.lang.NullPointerException
> at
> org.drools.util.CompositeClassLoader.getResourceAsStream(CompositeClassLoader.java:122)
> at
> org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:234)
> at
> org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:215)
> at
> org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createPackage(LookupEnvironment.java:748)
> at
> org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildTypeBindings(CompilationUnitScope.java:87)
> at
> org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.buildTypeBindings(LookupEnvironment.java:167)
> at
> org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:721)
> at
> org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:381)
> at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
> at
> org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:358)
> at
> org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
> at
> org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:369)
> at
> org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53)
> at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:71)
> at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:869)
> at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:826)
> at
> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:404)
> at
> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:586)
> at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37)
> at in.abhi.ws.Test.readKnowledgeBase(Test.java:31)
> at in.abhi.ws.Test.salesTax(Test.java:55)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at
> org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
> at
> org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117)
> at
> org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
> at
> org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110)
> at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
> at
> org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
> at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
> at
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
> at
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
> at
> org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
> at
> org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
> java.lang.NullPointerException
> at
> org.drools.util.CompositeClassLoader.getResourceAsStream(CompositeClassLoader.java:122)
> at
> org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:234)
> at
> org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:215)
> at
> org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createPackage(LookupEnvironment.java:748)
> at
> org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildTypeBindings(CompilationUnitScope.java:87)
> at
> org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.buildTypeBindings(LookupEnvironment.java:167)
> at
> org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:721)
> at
> org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:381)
> at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
> at
> org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:358)
> at
> org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
> at
> org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:369)
> at
> org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53)
> at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:71)
> at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:869)
> at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:826)
> at
> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:404)
> at
> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:586)
> at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37)
> at in.abhi.ws.Test.readKnowledgeBase(Test.java:31)
> at in.abhi.ws.Test.salesTax(Test.java:55)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at
> org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
> at
> org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117)
> at
> org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
> at
> org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110)
> at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
> at
> org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
> at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
> at
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
> at
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
> at
> org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
> at
> org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
> ****************
>
> Please let me know how to make it work
>
> --
> View this message in context: http://drools.46999.n3.nabble.com/Drools-as-a-Webservice-tp3950198.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
With kind regards,
Geoffrey De Smet
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