[jboss-jira] [JBoss JIRA] (DROOLS-778) Deserialization error: java.io.InvalidClassException: org.drools.base.evaluators.StrEvaluatorDefinition$StrEvaluator; no valid constructor

[Christoph Schachinger (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295694#comment-13295694 ] 

Christoph Schachinger commented on DROOLS-778:
----------------------------------------------

The issue is back with 6.4.0. We are serialising the knowledge-packages and deserializing them (for a quicker startup). This stars breaking with 6.4 for thouse rules which have the "str" operation in their WHEN condition.

> Deserialization error: java.io.InvalidClassException: org.drools.base.evaluators.StrEvaluatorDefinition$StrEvaluator; no valid constructor 
> -------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DROOLS-778
>                 URL: https://issues.jboss.org/browse/DROOLS-778
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 5.5.0.Final
>         Environment: Windows 7; Java 6; Drools 5.5.0.Final (incl. drools-core, drools-compiler, drools-spring and drools-camel)
>            Reporter: Philip McWilliams
>            Assignee: Mario Fusco
>             Fix For: 6.0.0.Final
>
>
> I am seeking to compile rules at build-time and then save (serialize) the output to disk.  At deployment, I then wish to build a knowledge base from the deserialized knowledge packages (rather than by re-compiling the source rules files).
> In general this works ... unless I use the "str" operator in an LHS.  This operator is implemented by the *org.drools.base.evaluators.StrEvaluatorDefinition$StrEvaluator* class and this class does not appear to deserialize properly.
> A round trip exercise on my local machine always fails with this error:
> {code}
> java.io.InvalidClassException: org.drools.base.evaluators.StrEvaluatorDefinition$StrEvaluator; org.drools.base.evaluators.StrEvaluatorDefinition$StrEvaluator; no valid constructor 
> {code}
> My serialization/deserialization code is standard ... to serialize:
> {code}
>     private void saveOutput(KnowledgeBuilder kbuilder) throws IOException {
>         Collection<KnowledgePackage> kpkgs = kbuilder.getKnowledgePackages();
>         String outputFilename = outputFile == null ? "" : outputFile.trim();
>         if (outputFilename.isEmpty()) {
>             outputFilename = project.getBasedir() + "target/classes/drools.drlx";
>         }
>         ObjectOutputStream out = null;
>         try {
>             getLog().info("Saving compiled Drools output to " + outputFilename);
>             out = new ObjectOutputStream(new FileOutputStream(outputFilename));
>             out.writeObject(kpkgs);
>         } finally {
>             if (out != null) {
>                 out.close();
>             }
>         }
>     }
> {code}
> ... to deserialize:
> {code}
>     private Collection<KnowledgePackage> deserializeKnowledgePackages(Resource[] knowledgePackageObjects) throws IOException, ClassNotFoundException {
>         Collection<KnowledgePackage> knowledgePackages = new ArrayList<KnowledgePackage>();
>         for (Resource knowledgePackageObject : knowledgePackageObjects) {
>             LOG.info("Deserializing pre-compiled package " + knowledgePackageObject.getFilename());
>             ObjectInputStream in = null;
>             try {
>                 in = new ObjectInputStream(knowledgePackageObject.getInputStream());
>                 // The input stream might contain an individual package or a collection.
>                 knowledgePackages.addAll((Collection<KnowledgePackage>) in.readObject());
>             } finally {
>                 if (in != null) {
>                     in.close();
>                 }
>             }
>         }
>         return knowledgePackages;
>     }
> {code}
> My workaround is to avoid using the "str" operator.
> *Apologies*: I have *not* checked version 6.2.0.Final because I have not yet worked out what versions of the Drools Spring and Camel modules to use (for 5.5.0.Final they were all versioned identically).



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