[ https://issues.jboss.org/browse/DROOLS-673?page=com.atlassian.jira.plugin... ] george thomas updated DROOLS-673: --------------------------------- Description: 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. The code in question is unchanged even in the [latest version in github|https://github.com/droolsjbpm/drools/blob/master/drools-core/src/m...]. was: 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/m...]. -- This message was sent by Atlassian JIRA (v6.3.11#6341)