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