Drools Fusion 5.3.0 example不能运行

Unable to Analyse Expression percent >= -0.08:
[Error: Comparison operation requires compatible types. Found class org.mvel2.util.MethodStub and class java.lang.Double]
[Near : {... percent >= -0.08 ....}]
                        ^
[Line: 52, Column: 28] : [Rule name='If the drop is between 6% and 8%, buy more shares']

Unable to Analyse Expression percent < -0.06:
[Error: Comparison operation requires compatible types. Found class org.mvel2.util.MethodStub and class java.lang.Double]
[Near : {... percent < -0.06 ....}]
                       ^
[Line: 52, Column: 28] : [Rule name='If the drop is between 6% and 8%, buy more shares']

Unable to Analyse Expression percent < -0.08:
[Error: Comparison operation requires compatible types. Found class org.mvel2.util.MethodStub and class java.lang.Double]
[Near : {... percent < -0.08 ....}]
                       ^
[Line: 65, Column: 28] : [Rule name='If the drop is on more than 8%, sell shares']

Unable to Analyse Expression percent >= -0.06:
[Error: Comparison operation requires compatible types. Found class org.mvel2.util.MethodStub and class java.lang.Double]
[Near : {... percent >= -0.06 ....}]
                        ^
[Line: 79, Column: 28] : [Rule name='If the drop is between 5% and 6%, do nothing']

看到这个错误肯定是运行drools-distribution-5.3.0.Final中的fusion-example例子，这个例子实际上是基于5.2.0的代码，5.3.0与5.2.0及以前的版本不同，所以报错。

fusion-example 5.3.0版本的代码实际上是在 droolsjbpm-integration-distribution-5.3.0.Final下，这里面的代码是可以执行的

JBoss论坛的解释在这 https://issues.jboss.org/browse/JBRULES-3306?focusedCommentId=12648364&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12648364

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