[rules-users] Re: JUnit and classpath

J Michael Dean Sat, 05 Jan 2008 10:10:56 -0800

Thanks. I remain unable to use JUnit. I have the code and several traces below and have attached them as files in case that is more readable. The behavior, to summarize, is that if I add nothing to the JUnit classpath OR if I add the full org.drools.eclipse_4.0.3.jar to the classpath, I get an error instantiating the package builder, AFTER successfully instantiating a configuration. If I use my own minimal drools plugin, I get an error instantiating the configuration itself. These lines are clearly marked in the code below, and the respective traces are below the code.

The minimal plugin works completely in my RCP, which uses essentially identical code to access Drools. It includes


* drools-core - the rule engine itself.

MVEL included just in case (because of the error I was misinterpreting)

* optional packages:
      o xpp3-1.1.3.4.O, xstream-1.2.2 - for audit feature

* drools-compiler - the rule compiler itself.
* antlr3-runtime-3.0
* eclipse-jdt-core-3.2.3.v_686_R32x -  to compile with eclipse

I don't really need JUnit to work against this minimal plugin, and I think when I add nothing to the JUnit classpath that JUnit already sees org.drools.eclipse_4.0.3.jar.

Here is the trace when I add nothing special to the JUnit classpath, showing 
that the configuration was instantiated in lines 38 - 40, but the crash occurs 
when instantiating the package builder in line 47.  This crash occurs before 
any effort is made to load a DRL, etc.  I get the same identical trace if I add 
org.drools.eclipse_4.0.3.jar to the classpath, which makes sense to me because 
this jar is in my IDE environment and should be visible to JUnit.

Package configuration is not null
java.lang.NullPointerException
        at 
org.mvel.optimizers.OptimizerFactory.<clinit>(OptimizerFactory.java:43)
        at 
org.drools.rule.builder.dialect.mvel.MVELDialect.init(MVELDialect.java:142)
        at org.drools.compiler.DialectRegistry.initAll(DialectRegistry.java:49)
        at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:146)
        at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:108)
        at 
droolsRules.tests.AllDroolsRulesTests.setUp(AllDroolsRulesTests.java:47)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at 
org.junit.internal.runners.BeforeAndAfterRunner.invokeMethod(BeforeAndAfterRunner.java:74)
        at 
org.junit.internal.runners.BeforeAndAfterRunner.runBefores(BeforeAndAfterRunner.java:50)
        at 
org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:33)
        at 
org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
        at 
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
        at 
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
[MVEL] Notice: Possible incorrect version of ASM present (3.0 required).  
Disabling JIT compiler.  Reflective Optimizer will be used.

If, on the other hand, I add the plugin that I use in my RCP, "minimal Drools", 
I get a different trace.  My plugin includes
* drools-core - the rule engine itself.
                MVEL included just in case (because of the error I was 
misinterpreting)
* optional packages:
      o xpp3-1.1.3.4.O, xstream-1.2.2 - for audit feature

* drools-compiler - the rule compiler itself.
* antlr3-runtime-3.0
* eclipse-jdt-core-3.2.3.v_686_R32x -  to compile with eclipse

Now the trace shows that the configuration file is not instantiated:

org.drools.RuntimeDroolsException: Unable to load dialect 
'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java'
        at 
org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:152)
        at 
org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:140)
        at 
org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:117)
        at 
org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:94)
        at 
droolsRules.tests.AllDroolsRulesTests.setUp(AllDroolsRulesTests.java:38)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at 
org.junit.internal.runners.BeforeAndAfterRunner.invokeMethod(BeforeAndAfterRunner.java:74)
        at 
org.junit.internal.runners.BeforeAndAfterRunner.runBefores(BeforeAndAfterRunner.java:50)
        at 
org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:33)
        at 
org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
        at 
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
        at 
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.NullPointerException
        at 
org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:146)
        ... 18 more

javaCode.java
Description: Binary data

In case the files are stripped, here are the contents. Code followed by traces.

I appreciate Drools - it is terrific. Thank you for any assistance you can provide to help me with this problem.


- Mike Dean


package droolsRules.tests;

import java.io.File;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.Reader;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.compiler.PackageBuilder;
import org.drools.compiler.PackageBuilderConfiguration;
import org.drools.rule.Package;
import org.drools.rule.builder.dialect.java.JavaDialectConfiguration;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import org.junit.runners.Suite.SuiteClasses;

/**
 * This suite is the place to add Drools tests.
 *
 * @author J. Michael Dean, M.D., M.B.A. (University of Utah)
 * Copyright 2005 - 2008.  All Rights Reserved.
 *
 */

@RunWith(Suite.class)
@SuiteClasses( { TestHypoglycemiaDetection.class })
public class AllDroolsRulesTests {
        public static RuleBase ruleBase;

        @BeforeClass
        public static void setUp() throws Exception {
                Reader source;

PackageBuilderConfiguration pkgConfig = new PackageBuilderConfiguration(); //ERROR OCCURS HERE WHEN I USE MY MINIMAL DROOLS PLUGIN JAR JavaDialectConfiguration javaDialectConf = (JavaDialectConfiguration) pkgConfig.getDialectConfiguration("java");

                javaDialectConf.setCompiler(JavaDialectConfiguration.ECLIPSE);
                
                if (pkgConfig == null) {
                        System.out.println("Error - null package 
configuration");
                } else {
                        System.out.println("Package configuration is not null");
                }

final PackageBuilder builder = new PackageBuilder(pkgConfig); // ERROR OCCURS HERE WHEN I USE DROOLS.ORG.ECLIPSE_4.0.3.JAR

                boolean exists = (new 
File("rules/GlucoseDroolRules00.drl")).exists();
                if (exists) {
                        builder.addPackageFromDrl(new FileReader(
                                "rules/GlucoseDroolRules00.drl"));
                        System.out.println("Found the file!");
                } else {
                        System.out.println("Cannot locate the file - will try as 
resource");
                        source = new InputStreamReader(AllDroolsRulesTests.class
                                        
.getResourceAsStream("GlucoseDroolRules00.drl"));
                        if (source == null){
                                System.out.println("Could not get input 
stream");
                        } else {
                                System.out.println("Opened the stream 
successfully");
                        }
                        builder.addPackageFromDrl(source);
                }
                if (builder.hasErrors()) {
                        System.out.println(builder.getErrors().toString());
                }
                Package pkg = builder.getPackage();
                ruleBase = RuleBaseFactory.newRuleBase();
                ruleBase.addPackage(pkg);
        }

        @AfterClass
        public static void tearDown() throws Exception {
        }

        public static RuleBase getRuleBase() {
                return ruleBase;
        }
}

Here are the respective traces (am sorry for the length of this post)

Here is the trace when I add nothing special to the JUnit classpath, showing that the configuration was instantiated in lines 38 - 40, but the crash occurs when instantiating the package builder in line 47. This crash occurs before any effort is made to load a DRL, etc. I get the same identical trace if I add org.drools.eclipse_4.0.3.jar to the classpath, which makes sense to me because this jar is in my IDE environment and should be visible to JUnit.


Package configuration is not null
java.lang.NullPointerException

at org.mvel.optimizers.OptimizerFactory.<clinit>(OptimizerFactory.java:43) at org.drools.rule.builder.dialect.mvel.MVELDialect.init(MVELDialect.java: 142)

        at org.drools.compiler.DialectRegistry.initAll(DialectRegistry.java:49)
        at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:146)
        at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:108)

at droolsRules.tests.AllDroolsRulesTests.setUp(AllDroolsRulesTests.java:47)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun .reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 39) at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)

        at java.lang.reflect.Method.invoke(Method.java:585)

at org .junit .internal .runners.BeforeAndAfterRunner.invokeMethod(BeforeAndAfterRunner.java:74) at org .junit .internal .runners.BeforeAndAfterRunner.runBefores(BeforeAndAfterRunner.java:50) at org .junit .internal .runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:33) at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52) at org .eclipse .jdt .internal .junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38) at org .eclipse .jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org .eclipse .jdt .internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java: 460) at org .eclipse .jdt .internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java: 673) at org .eclipse .jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java: 386) at org .eclipse .jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java: 196) [MVEL] Notice: Possible incorrect version of ASM present (3.0 required). Disabling JIT compiler. Reflective Optimizer will be used.

If, on the other hand, I add the plugin that I use in my RCP, "minimal Drools", I get a different trace. My plugin includes

* drools-core - the rule engine itself.

MVEL included just in case (because of the error I was misinterpreting)

* optional packages:
      o xpp3-1.1.3.4.O, xstream-1.2.2 - for audit feature

* drools-compiler - the rule compiler itself.
* antlr3-runtime-3.0
* eclipse-jdt-core-3.2.3.v_686_R32x -  to compile with eclipse

Now the trace shows that the configuration file is not instantiated:

org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java' at org .drools .compiler .PackageBuilderConfiguration .addDialect(PackageBuilderConfiguration.java:152) at org .drools .compiler .PackageBuilderConfiguration .buildDialectConfigurationMap(PackageBuilderConfiguration.java:140) at org .drools .compiler .PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:117) at org .drools .compiler .PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:94) at droolsRules.tests.AllDroolsRulesTests.setUp(AllDroolsRulesTests.java:38)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun .reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 39) at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25)

        at java.lang.reflect.Method.invoke(Method.java:585)

Caused by: java.lang.NullPointerException

at org .drools .compiler .PackageBuilderConfiguration .addDialect(PackageBuilderConfiguration.java:146)

        ... 18 more

On Jan 3, 2008, at 8:21 AM, [EMAIL PROTECTED] wrote:



Message: 4
Date: Thu, 03 Jan 2008 15:21:13 +0000
From: Mark Proctor <[EMAIL PROTECTED]>
Subject: Re: [rules-users] Re: JUnit and classpath
To: Rules Users List <rules-users@lists.jboss.org>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

J Michael Dean wrote:

I noticed the absence of asm and tried to manually add version 3.1 and
this had no effect on the trace.

It gets  a null pointer and says it can't use ASM in MVEL, thus uses
reflection mode. That's fine as reflection is the mode we put MVEL in
anyway. It's more of am informational warning than an error.

...

On Jan 2, 2008, at 10:00 AM, [EMAIL PROTECTED] wrote:



Mike,

So it seems you are missing the ASM jar in your classpath... did you
tried
adding it?
BTW, what is this MinimalDroolCore_1.0.0.jar that you are adding to
your
classpath? Drools also includes an inlined ASM version inside it for
its own
use... are you stripping that?

[]s
Edson

...
Mike,

This looks like a classpath problem indeed. Did you tried asking
the JVM
to dump its classpath so that you can know for sure what jars are
included
and if any of them embeds a non-compatible ASM version ?

[]s
Edson


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[rules-users] Re: JUnit and classpath

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