[jboss-jira] [JBoss JIRA] (DROOLS-673) NPE because ConsequenceMetaData.toString is not null-safe

[george thomas (JIRA)]

george thomas created DROOLS-673:
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             Summary: NPE because ConsequenceMetaData.toString is not null-safe
                 Key: DROOLS-673
                 URL: https://issues.jboss.org/browse/DROOLS-673
             Project: Drools
          Issue Type: Bug
    Affects Versions: 6.1.0.Final
            Reporter: george thomas
            Assignee: Mark Proctor
            Priority: Minor
         Attachments: ConsequenceMetaData.NPE.log

The {{toString()}} method in {{org.drools.core.rule.ConsequenceMetaData}} is not null-safe. It assumes that the {{List}} {{statements}} contains at least one element. 

This is a problem when the method gets invoked during the serialization-based deep clone effected during initialization under certain conditions (see the "Reproduce" section).

With this combination, code in {{java.io.ObjectOutputStream}} ends up invoking the {{toString()}} method in order to print additional information in the stack trace for {{java.io.NotSerializableException}}. I have attached a snippet of the stack trace as a reference.

This is a problem even in the [latest version in github|https://github.com/droolsjbpm/drools/blob/master/drools-core/src/main/java/org/drools/core/rule/ConsequenceMetaData.java#L34].



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