drools的JavaDialect异常

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一般在eclipse里使用drools，出现下面错误时，很多网上的解决方法是加一个org.eclipse.jdt.core_3.5.2.v_981_R35x.jar包，其实不是，下面的错误主要是缺少java的方言解析类org.drools.rule.builder.dialect.java.JavaDialectConfiguration，使用一个drools插件打包的jar就ok了，pom为：
  <dependency>
   <groupId>org.apache.servicemix.bundles</groupId>
   <artifactId>org.apache.servicemix.bundles.drools</artifactId>
   <version>5.6.0.Final_1</version>
  </dependency>

碰到的错误异常信息：
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:277)
at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:262)
at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:175)
at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153)
at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:201)
at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:129)
at org.drools.examples.HelloWorldExample.main(HelloWorldExample.java:41)
Caused by: org.drools.RuntimeDroolsException: value '1.7' is not a valid language level
at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.getDefaultLanguageLevel(JavaDialectConfiguration.java:161)
at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:56)
at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:273)
... 6 more

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