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Bug
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Resolution: Done
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Major
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5.5.0.Final
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None
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$StrEvaluator class and this class does not appear to deserialize properly.
A round trip exercise on my local machine always fails with this error:
java.io.InvalidClassException: org.drools.base.evaluators.StrEvaluatorDefinition$StrEvaluator; org.drools.base.evaluators.StrEvaluatorDefinition$StrEvaluator; no valid constructor
My serialization/deserialization code is standard ... to serialize:
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(); } } }
... to deserialize:
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; }
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).
1.
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DROOLS-778 is back with 6.4.0 |
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Closed | 
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Mario Fusco |
