On 17 June 2011 10:35, Wolfgang Laun <wolfgang.laun@gmail.com> wrote:

More careful reading of org.drools.rule.Package shows that readExternal and writeExternal aren't working on plain ObjectOutputStream in combination with change set monitoring. You must

      OutputStream os = new FileOutputStream( pkgPath );
      ObjectOutputStream oos = new DroolsObjectOutputStream( os );
      KnowledgePackage kPackage = kBuilder.getKnowledgePackages().iterator().next();
      oos.writeObject( kPackage );
      oos.close();

org.drools.common.DroolsObjectOutputStream - although justa renaming subclass of ObjectOutputStream - is not part of the "stable" API.

-W

On 16 June 2011 19:46, lhorton <LHorton@abclegal.com> wrote:

That is what I was doing in my original source. Your code gives me the same
original exception:

Caused by: java.lang.ClassCastException: [B cannot be cast to
org.drools.rule.DialectRuntimeRegistry

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