Description of problem:
It is not possible to load BRL file resource via changeset of KnowledgeAgent, but only when you use just engine libraries. As I have discovered, you have to add gui libraries to classpath to make BRL loading via knowledge agent working. I guess that if knowledge agent is part of the engine, then it should work without gui libraries, particularly without class org.drools.ide.common.BusinessRuleProviderDefaultImpl.

Stack trace:
java.lang.RuntimeException: org.drools.compiler.DroolsParserException: java.lang.IllegalArgumentException: Unable to instantiate service for Class 'org.drools.compiler.BusinessRuleProvider'
	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:644)
	at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
	at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:712)
	at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1002)
	at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785)
	at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657)
	at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190)
	at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169)
	at com.sample.LoadBRL.testSimpleBRLLoad(LoadBRL.java:34)
	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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.drools.compiler.DroolsParserException: java.lang.IllegalArgumentException: Unable to instantiate service for Class 'org.drools.compiler.BusinessRuleProvider'
	at org.drools.compiler.PackageBuilder.addPackageFromBrl(PackageBuilder.java:490)
	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:559)
	... 31 more
Caused by: java.lang.IllegalArgumentException: Unable to instantiate service for Class 'org.drools.compiler.BusinessRuleProvider'
	at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:161)
	at org.drools.compiler.BusinessRuleProviderFactory.loadProvider(BusinessRuleProviderFactory.java:46)
	at org.drools.compiler.BusinessRuleProviderFactory.getProvider(BusinessRuleProviderFactory.java:35)
	at org.drools.compiler.PackageBuilder.addPackageFromBrl(PackageBuilder.java:468)
	... 32 more
Caused by: java.lang.IllegalArgumentException: Unable to instantiate 'org.drools.ide.common.BusinessRuleProviderDefaultImpl'
	at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:210)
	at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:202)
	at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:159)
	... 35 more
Caused by: java.lang.ClassNotFoundException: org.drools.ide.common.BusinessRuleProviderDefaultImpl
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:186)
	at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:207)
	... 37 more




Version-Release number of selected component (if applicable):
BRMS 5.2.0 ER3

How reproducible:
Create knowledge agent and load brl file via changeset.

Steps to Reproduce:
1. Unzip attached files.
2. Run JUnit to reproduce bug.
  
Actual results:
BRL file cannot be loaded via knowledge agent without gui libraries.

Expected results:
Knowledge agent should not depend on gui libraries.

Additional info: