Problem injecting drools WorkingMemory

[sjmenden]

I am following the documentation for injecting the WorkingMemory into an EJB. I know my problem is configuration, but there are no working examples specific to the documentation, so I'm having trouble:

SEVERE: Error Rendering View[/purchase.xhtml]
org.jboss.seam.RequiredException: In attribute requires value for component: purchaseHome.purchasingRulesMemory
 at org.jboss.seam.Component.getInstanceToInject(Component.java:1844)
 at org.jboss.seam.Component.injectFields(Component.java:1317)
 at org.jboss.seam.Component.inject(Component.java:1087)
 at org.jboss.seam.interceptors.BijectionInterceptor.bijectTargetComponent(BijectionInterceptor.java:48)
 ...

components.xml

<components xmlns:drools="http://jboss.com/products/drools">

 ...

 <drools:rule-base name="purchasingRules">
 <drools:rule-files>
 <value>purchasingRules.drl</value>
 </drools:rule-files>
 </drools:rule-base>

 <drools:managed-working-memory name="purchasingRulesMemory" auto-create="true" rule-base="#{purchasingRules}"/>

 ...

</components>

purchasingRules.drl, located in the resources dir, but I'm copying it over to WEB-INF/classes because the docs say that the rule is looked for on the classpath

package test.purchasing

rule "Step 1"

 when
 s : PurchaseStatus( status == "New Request")
 then
 System.out.println("Rule Triggered!!!!!!!!!");
 System.out.println(s);
 s.setStatus("Waiting for purchase Approval.");
 s.setNextStep("Step 1");

end

PurchaseHome.java

...

@Name("purchaseHome")
@LoggedIn
public class PurchaseHome extends EntityHome<Purchase> {

 @In WorkingMemory purchasingRulesMemory;

 ...
}

[sjmenden]

I made some progress but now getting massive exceptions. I changed the components.xml to look like the drools example one:

components.xml

...
<component name="ruleBase" class="org.jboss.seam.drools.RuleBase">
 <property name="ruleFiles">purchasingRules.drl</property>
 </component>

 <component name="purchasingRulesMemory" class="org.jboss.seam.drools.ManagedWorkingMemory">
 <property name="ruleBase">#{ruleBase}</property>
 </component>
...

But now I'm getting a ClassCastException, and I have verified my jars exactly(crosses fingers) mirror the ones in the example. I'm running SEAM CR2 with JBoss 4.0.5

17:16:25,918 ERROR [STDERR] StringTemplate: problem parsing group <unknown>: java.lang.ClassCastException: antlr.CommonToken cannot be cast to antlr.Token
17:16:25,919 ERROR [STDERR] java.lang.ClassCastException: antlr.CommonToken cannot be cast to antlr.Token
17:16:25,919 ERROR [STDERR] at antlr.CharScanner.makeToken(CharScanner.java:173)
17:16:25,920 ERROR [STDERR] at org.antlr.stringtemplate.language.GroupLexer.mID(GroupLexer.java:333)
17:16:25,920 ERROR [STDERR] at org.antlr.stringtemplate.language.GroupLexer.nextToken(GroupLexer.java:103)
17:16:25,920 ERROR [STDERR] at antlr.TokenBuffer.fill(TokenBuffer.java:69)
17:16:25,920 ERROR [STDERR] at antlr.TokenBuffer.LA(TokenBuffer.java:80)
17:16:25,920 ERROR [STDERR] at antlr.LLkParser.LA(LLkParser.java:52)
17:16:25,920 ERROR [STDERR] at antlr.Parser.match(Parser.java:210)
17:16:25,921 ERROR [STDERR] at org.antlr.stringtemplate.language.GroupParser.group(GroupParser.java:117)
17:16:25,921 ERROR [STDERR] at org.antlr.stringtemplate.StringTemplateGroup.parseGroup(StringTemplateGroup.java:754)
17:16:25,921 ERROR [STDERR] at org.antlr.stringtemplate.StringTemplateGroup.<init>(StringTemplateGroup.java:264)
17:16:25,921 ERROR [STDERR] at org.antlr.stringtemplate.StringTemplateGroup.<init>(StringTemplateGroup.java:244)
17:16:25,921 ERROR [STDERR] at org.drools.semantics.java.RuleBuilder.<clinit>(Unknown Source)
17:16:25,921 ERROR [STDERR] at org.drools.compiler.PackageBuilder.addRule(Unknown Source)
17:16:25,922 ERROR [STDERR] at org.drools.compiler.PackageBuilder.addPackage(Unknown Source)
17:16:25,922 ERROR [STDERR] at org.jboss.seam.drools.RuleBase.compileRuleBase(RuleBase.java:52)
17:16:25,922 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
17:16:25,922 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
17:16:25,922 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
17:16:25,922 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:597)
17:16:25,923 ERROR [STDERR] at org.jboss.seam.util.Reflections.invoke(Reflections.java:18)
...

[gavin.king]

There is an example application in the examples/drools directory.

[sjmenden]

I am following the example as closely as I possibly can. I can not track seam to track down this problem.

Here is the directory structure of the drools example deployed and my application deployed:

JBoss- seam

EAR contents:

drwxr-xr-x 3 root root 4096 Dec 8 11:00 drools
drwxr-xr-x 4 root root 4096 Dec 8 11:00 jboss-seam-drools-exp.war
-rw-r--r-- 1 root root 3005 Dec 8 11:00 jboss-seam-drools.jar
-rw-r--r-- 1 root root 627241 Dec 8 11:00 jboss-seam.jar
drwxr-xr-x 2 root root 4096 Dec 8 11:00 lib
drwxr-xr-x 2 root root 4096 Dec 8 11:00 META-INF
-rw-r--r-- 1 root root 923 Dec 8 11:00 numberguess.drl
-rw-r--r-- 1 root root 1026 Dec 8 11:00 pageflow.jpdl.xml

drools/lib:

-rw-r--r-- 1 root root 443432 Dec 8 11:00 antlr-2.7.6.jar
-rw-r--r-- 1 root root 546498 Dec 8 11:00 antlr-3.0ea8.jar
-rw-r--r-- 1 root root 36846 Dec 8 11:00 commons-jci-core-1.0-406301.jar
-rw-r--r-- 1 root root 10802 Dec 8 11:00 commons-jci-janino-2.4.3.jar
-rw-r--r-- 1 root root 207723 Dec 8 11:00 commons-lang-2.1.jar
-rw-r--r-- 1 root root 26202 Dec 8 11:00 commons-logging-api-1.0.4.jar
-rw-r--r-- 1 root root 635207 Dec 8 11:00 drools-compiler-3.0.5.jar
-rw-r--r-- 1 root root 550976 Dec 8 11:00 drools-core-3.0.5.jar
-rw-r--r-- 1 root root 383546 Dec 8 11:00 janino-2.4.3.jar
-rw-r--r-- 1 root root 358843 Dec 8 11:00 stringtemplate-2.3b6.jar

lib:

jbpm-3.1.2.jar

My Purchasing App

EAR contents:

drwxr-xr-x 3 root root 4096 Dec 8 11:11 drools
drwxr-xr-x 4 root root 4096 Dec 8 11:11 purchasing.jar
drwxr-xr-x 4 root root 4096 Dec 8 11:11 purchasing.war
-rw-r--r-- 1 root root 619971 Dec 8 11:11 jboss-seam.jar
-rw-r--r-- 1 root root 600277 Dec 8 11:11 jbpm-3.1.2.jar
drwxr-xr-x 2 root root 4096 Dec 8 11:11 META-INF
-rw-r--r-- 1 root root 359 Dec 8 11:11 purchasingRules.drl

drools/lib:

-rw-r--r-- 1 root root 443432 Dec 8 11:11 antlr-2.7.6.jar
-rw-r--r-- 1 root root 546498 Dec 8 11:11 antlr-3.0ea8.jar
-rw-r--r-- 1 root root 36846 Dec 8 11:11 commons-jci-core-1.0-406301.jar
-rw-r--r-- 1 root root 10802 Dec 8 11:11 commons-jci-janino-2.4.3.jar
-rw-r--r-- 1 root root 26202 Dec 8 11:11 commons-logging-api-1.0.4.jar
-rw-r--r-- 1 root root 635207 Dec 8 11:11 drools-compiler-3.0.5.jar
-rw-r--r-- 1 root root 550976 Dec 8 11:11 drools-core-3.0.5.jar
-rw-r--r-- 1 root root 383546 Dec 8 11:11 janino-2.4.3.jar
-rw-r--r-- 1 root root 358843 Dec 8 11:11 stringtemplate-2.3b6.jar

purchasing.war/WEB-INF/lib:

-rw-r--r-- 1 root root 24432 Dec 8 11:11 el-api.jar
-rw-r--r-- 1 root root 97471 Dec 8 11:11 el-ri.jar
-rw-r--r-- 1 root root 5096 Dec 8 11:11 jboss-seam-debug.jar
-rw-r--r-- 1 root root 70709 Dec 8 11:11 jboss-seam-ui.jar
-rw-r--r-- 1 root root 291366 Dec 8 11:11 jsf-facelets.jar

There are a few difference in location, like I have some libs in WEB-INF/lib whereas drools has it in <EAR dir>/lib

I don't think this matters though because I have the correct paths in my application.xml. My application deploys fine, but the first time I try to access a page which accesses drools I get:

17:16:25,918 ERROR [STDERR] StringTemplate: problem parsing group <unknown>: java.lang.ClassCastException: antlr.CommonToken cannot be cast to antlr.Token
17:16:25,919 ERROR [STDERR] java.lang.ClassCastException: antlr.CommonToken cannot be cast to antlr.

Do you guys have any pointers whatsoever as to the means that I can debug this problem. I will, as a last resort, take the drools example and copy all of my files to it and see if that works, but right now I am running a seam-gen project that has a little different dir structure.