title: Drools runtime error
body: <p>I'm trying to run <code>Drools</code> sample ( the HelloWorld sample when creating a new Drools project ), I didn't change anything in the project but I'm getting an error.<br></p>
  
  <p>Here's the stacktrace:</p>
  
  <pre><code>SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
  SLF4J: Defaulting to no-operation (NOP) logger implementation
  SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
  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:321)
      at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:307)
      at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:192)
      at org.drools.compiler.PackageBuilderConfiguration.&lt;init&gt;(PackageBuilderConfiguration.java:170)
      at org.drools.compiler.PackageBuilder.&lt;init&gt;(PackageBuilder.java:300)
      at org.drools.compiler.PackageBuilder.&lt;init&gt;(PackageBuilder.java:228)
      at org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFactoryServiceImpl.java:34)
      at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:46)
      at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:39)
      at com.sample.DroolsTest.main(DroolsTest.java:23)
  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:100)
      at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:61)
      at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:317)
      ... 9 more
  </code></pre>
  
  <p>I'm running the project in eclipse IDE</p>