[rules-users] ClassNotFound on class defined in drl with 5.5.0.CR1
Michael Anstis
michael.anstis at gmail.com
Wed Oct 24 06:27:13 EDT 2012
Are the classes you import in your DRL available on the classpath at
runtime?
On 24 October 2012 11:10, Willem van Asperen <willem at van.asperen.org> wrote:
> Dear All,
>
> I use the Drools compiler to compile a set of drl files:
>
>
> KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder(configuration);
> kbuilder.add(ResourceFactory.newFileResource(fileName),
> ResourceType.DRL);
>
> KnowledgeBuilderErrors errors = kbuilder.getErrors();
> if (errors.size() > 0) {
> for (KnowledgeBuilderError error: errors) {
> logger.error(error);
> }
> throw new IllegalArgumentException("Could not parse
> knowledge.");
> }
>
> ObjectOutputStream out = new ObjectOutputStream(new
> FileOutputStream(fileName+".compiled"));
> out.writeObject( kbuilder.getKnowledgePackages());
> out.close();
>
> I then load these *.compiled files into my application:
>
>
> for (String packageName : packages) {
> InputStream is =
> getClass().getResourceAsStream("/"+packageName+".drl.compiled");
> if (is != null) {
> logger.debug("adding package '"+packageName+"'");
> ObjectInputStream in = new ObjectInputStream(is);
> kbase.addKnowledgePackages((Collection<KnowledgePackage>) in.readObject());
> in.close();
> } else
> throw new FileNotFoundException("could not find
> resource for package "+packageName);
> is.close();
> }
>
> In some of these drl files I declare a class, for instance:
>
> package vcm.selection.standard;
>
> import com.paconsulting.pase.transport.agents.ShiftWorker;
> import com.paconsulting.pase.transport.agents.VCMShiftWorker;
> import com.paconsulting.pase.transport.actions.ExecutableAction;
> import com.paconsulting.pase.transport.agents.ScheduleManagingContainer;
> import com.paconsulting.pase.transport.agents.water.Bridge;
> import com.paconsulting.pase.transport.agents.movers.AbstractMover;
> import com.paconsulting.pase.transport.agents.movers.Ship;
> import com.paconsulting.pase.transport.agents.movers.VCMShip;
>
> declare RelevantExecutableAction
> agent : ShiftWorker
> executableAction : ExecutableAction
> end
> ...
>
> When running the
> kbase.addKnowledgePackages((Collection<KnowledgePackage>)
> in.readObject()) I get the following ClassNotFound stack trace:
>
> java.lang.ClassNotFoundException:
> vcm.selection.standard.RelevantExecutableAction
> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:264)
> at
>
> org.drools.common.DroolsObjectInputStream.resolveClass(DroolsObjectInputStream.java:85)
> at
>
> org.drools.common.DroolsObjectInputStream.resolveClass(DroolsObjectInputStream.java:97)
> at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1593)
> at
> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1514)
> at java.io.ObjectInputStream.readClass(ObjectInputStream.java:1480)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1330)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at
>
> org.drools.rule.ConsequenceMetaData$Statement.readExternal(ConsequenceMetaData.java:61)
> at
> java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1810)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at java.util.ArrayList.readObject(ArrayList.java:733)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at
>
> org.drools.rule.ConsequenceMetaData.readExternal(ConsequenceMetaData.java:19)
> at
> java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1810)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at org.drools.rule.Rule.readExternal(Rule.java:207)
> at
> java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1810)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at
>
> org.drools.rule.JavaDialectRuntimeData.readExternal(JavaDialectRuntimeData.java:195)
> at
> java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1810)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at java.util.HashMap.readObject(HashMap.java:1155)
> at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
> at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at
>
> org.drools.rule.DialectRuntimeRegistry.readExternal(DialectRuntimeRegistry.java:58)
> at
> java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1810)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at org.drools.rule.Package.readExternal(Package.java:208)
> at
>
> org.drools.definitions.impl.KnowledgePackageImp.readExternal(KnowledgePackageImp.java:157)
> at
> java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1810)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at java.util.ArrayList.readObject(ArrayList.java:733)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
> at
>
> com.paconsulting.pase.core.configuration.runconfig.definition.KnowledgebaseDefinition.addPackages(KnowledgebaseDefinition.java:48)
> at
>
> com.paconsulting.pase.core.configuration.runconfig.definition.KnowledgebaseDefinition.materialize(KnowledgebaseDefinition.java:59)
> at
>
> com.paconsulting.pase.core.configuration.runconfig.definition.TeamDefinition.materialize(TeamDefinition.java:97)
> at
>
> com.paconsulting.pase.core.configuration.runconfig.definition.OperatingModelDefinition.materialize(OperatingModelDefinition.java:36)
> at
> com.paconsulting.pase.core.configuration.runconfig.Run.<init>(Run.java:31)
> at
>
> com.paconsulting.pase.core.configuration.runconfig.definition.RunDefinition.materialize(RunDefinition.java:53)
> at
>
> com.paconsulting.pase.core.configuration.runconfig.RunConfigExecutor$ScheduleExecutorWrapper.run(RunConfigExecutor.java:69)
> ...
>
> I'm sure I miss something as this is basic functionality. Maybe I must
> tell the kbase where to load the classes...
>
> Can someone point me in the right direction?
>
> Thanks,
> Willem
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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