[rules-users] Unable to get LastModified for ClasspathResource

Davide Sottara dsotty at gmail.com
Thu Jul 18 05:27:27 EDT 2013 

The ClassPath resource should be relative to the classpath root, i.e. include the "packages"/subfolders.
So, "builder.add(ResourceFactory.newClassPathResource("General.drl"), ResourceType.DRL)" won't probably work
if the DRL is in a subpackage.
Likewise, "builder.add(ResourceFactory.newClassPathResource(getClass().getResource("General.drl").getFile()), ResourceType.DRL)"
results in an absolute path "/home/ste/workspace2/REC-mv/target/classes/rec/reasoner/" which is outside the scope of the jar. 
Can you try something like "/rec/reasoner/General.drl" - possibly without the leading "/"?
Davide


On 07/18/2013 10:04 AM, sottostee wrote:
> Hi everyone,
>
> I have got a problem that me go mad.  
>
> Clarify I'm working with a Maven project using Eclipse.
>
> I'm trying to add at my KnowledgeBuilder, after i have correctly created a
> new instance of it, a drl file.
> In order of this, i call a method: void
> org.drools.builder.KnowledgeBuilder.add(Resource arg0, ResourceType arg1),
> give it like a Resource "ResourceFactory.newClassPathResource(String: name
> of my drl)" and like ResourceType: "ResourceType.DRL".
>
> As long as i run my project into Eclipse, all works well.
>
> But, if i create a jar file of my project, when i run this, i have this
> exception:
>
> java.lang.RuntimeException: Unable to get LastModified for ClasspathResource
>         at
> org.drools.io.impl.ClassPathResource.getLastModified(ClassPathResource.java:204)
>         at
> org.drools.io.impl.ClassPathResource.getInputStream(ClassPathResource.java:141)
>         at org.drools.compiler.DrlParser.parse(DrlParser.java:145)
>         at org.drools.compiler.DrlParser.parse(DrlParser.java:139)
>         at
> org.drools.compiler.PackageBuilder.drlToPackageDescr(PackageBuilder.java:477)
>         at
> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:466)
>         at
> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:694)
>         at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:51)
>         at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:40)
>         at rec.reasoner.Reasoner.init(Reasoner.java:192)
>         at rec.reasoner.Reasoner.<init>(Reasoner.java:176)
>         at rec.reasoner.Reasoner.newReasoner(Reasoner.java:51)
>         at rec.model.Model.<init>(Model.java:37)
>         at rec.controller.Controller.<init>(Controller.java:26)
>         at applet.Demo.<init>(Demo.java:18)
>         at applet.Demo.main(Demo.java:36)
>         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:616)
>         at
> org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
> Caused by: java.io.FileNotFoundException: 'General_multivalue.drl' cannot be
> opened because it does not exist
>         at
> org.drools.io.impl.ClassPathResource.getURL(ClassPathResource.java:165)
>         at
> org.drools.io.impl.ClassPathResource.getLastModified(ClassPathResource.java:177)
>         ... 20 more
>
> line 192 is properly:
> 'builder.add(ResourceFactory.newClassPathResource("General.drl"),
> ResourceType.DRL);'
>
> Well....given that in my project I've got some classes which make use of
> images, and given that, in this classes I call this method:
> getClass().getResource(String of image).getFile() in order to load the
> images, and all seems work very well; therefore I'm doing the same thing
> with drl file:
>
> I change the old method with:
> builder.add(ResourceFactory.newClassPathResource(getClass().getResource("General.drl").getFile()),
> ResourceType.DRL);
>
> Now:
>
> 1) when i run jar file, the exception is:
> java.lang.NullPointerException
>         at rec.reasoner.Reasoner.init(Reasoner.java:189)
>         at rec.reasoner.Reasoner.<init>(Reasoner.java:176)
>         at rec.reasoner.Reasoner.newReasoner(Reasoner.java:51)
>         at rec.model.Model.<init>(Model.java:37)
>         at rec.controller.Controller.<init>(Controller.java:26)
>         at applet.Demo.<init>(Demo.java:18)
>         at applet.Demo.main(Demo.java:36)
>         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:616)
>         at
> org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
>
> 2) and when i run the project into Eclipse, the exception is:
>
> java.lang.RuntimeException: Unable to get LastModified for ClasspathResource
>         at
> org.drools.io.impl.ClassPathResource.getLastModified(ClassPathResource.java:204)
>         at
> org.drools.io.impl.ClassPathResource.getInputStream(ClassPathResource.java:141)
>         at org.drools.compiler.DrlParser.parse(DrlParser.java:145)
>         at org.drools.compiler.DrlParser.parse(DrlParser.java:139)
>         at
> org.drools.compiler.PackageBuilder.drlToPackageDescr(PackageBuilder.java:477)
>         at
> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:466)
>         at
> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:694)
>         at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:51)
>         at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:40)
>         at rec.reasoner.Reasoner.init(Reasoner.java:189)
>         at rec.reasoner.Reasoner.<init>(Reasoner.java:176)
>         at rec.reasoner.Reasoner.newReasoner(Reasoner.java:51)
>         at rec.model.Model.<init>(Model.java:37)
>         at rec.controller.Controller.<init>(Controller.java:26)
>         at applet.Demo.<init>(Demo.java:18)
>         at applet.Demo.main(Demo.java:36)
> Caused by: java.io.FileNotFoundException:
> '/home/ste/workspace2/REC-mv/target/classes/rec/reasoner/General_multivalue.drl'
> cannot be opened because it does not exist
>         at
> org.drools.io.impl.ClassPathResource.getURL(ClassPathResource.java:165)
>         at
> org.drools.io.impl.ClassPathResource.getLastModified(ClassPathResource.java:177)
>         ... 15 more  
>
> but in  '/home/ste/workspace2/REC-mv/target/classes/rec/reasoner/' the file
> 'General_multivalue.drl' EXISTS!!!!
>
> Are there anyone who help me please?
> Thanks in advance. 
>
> sotto 
>
>
>
> --
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