[rules-users] beginner needs help

Hi all, I just started using Drools. I tried to run some example, but they all give me errors. Is there any simple instructions for beginners? Any help is appreciated. Senlin ==== I tried to run examples in drools-examples/drools-examples-drl/src/main/java/org/drools/examples But got some exceptions such as: Exception in thread "main" org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java:org.drools.rule.builder.dialect.java.JavaDialectConfiguration' at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:188) at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:173) at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:146) at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:123) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:141) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:102) at HelloWorldExample.main(HelloWorldExample.java:31) Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:91) at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:52) at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:184) ... 6 more ====