[rules-dev] Need help: DroolsStreamUtils.streamIn(InputStream) fails resolving declared data type in 5.2.0.Final+
Ansgar Konermann
ansgar.konermann at googlemail.com
Wed Sep 21 19:08:14 EDT 2011
Hi,
While trying to get some integration tests of the Maven Drools Plugin
green when used with Drools 5.2.0.Final and 5.3.0.Beta1, I'm getting
weird behaviour of the newer Drools version when it comes to
deserializing KnowledgePackages.
What do I do in the code?
- compile three *.drl files (see below)
- serialize the resulting KnowledgePackages using
DroolsStreamUtils.streamOut(new FileOutputStream(outputFile),
knowledgeBuilder.getKnowledgePackages(), false) from within the plugin
(see [1], [2])
- de-serialize the knowledge packages using
DroolsStreamUtils.streamIn(new FileInputStream(file)) in a TestNG test
[3], using [4]
- I get java.lang.ClassNotFoundException for a declared data type:
java.lang.ClassNotFoundException: model.Age
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at
org.drools.common.DroolsObjectInputStream.resolveClass(DroolsObjectInputStream.java:85)
at
org.drools.common.DroolsObjectInputStream.resolveClass(DroolsObjectInputStream.java:97)
at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1574)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
Strangely enough, the same code works well if I switch to Drools 5.1.1.
What changed between 5.1.1 and 5.2.0.Final that might cause this effect?
Might I be doing something wrong using DroolsStreamUtils?
Would be happy about any hints.
Thank you in advance.
Here are the three input files, which get compiled exactly in this order:
1) Person.drl
package model;
declare Person
name: String
end
2) Age.drl
package model;
declare Age
person: Person
age: Integer
end
3) minimum-age.drl:
package rules;
dialect "mvel"
import model.Person;
import model.Age;
rule "check minimum age"
when
Age( $person: person, age < 18 )
then
insertLogical("TOO YOUNG: " + $person.name )
end
Best regards
Ansgar
[1]
https://github.com/maven-drools/plugin.maven-drools-plugin/blob/57c77fce26ceac41256e7f70c4e4daa2f411de4f/mojos/src/main/java/de/lightful/maven/plugins/drools/mojos/CompileMojo.java
[2]
https://github.com/maven-drools/plugin.maven-drools-plugin/blob/57c77fce26ceac41256e7f70c4e4daa2f411de4f/mojos/src/main/java/de/lightful/maven/plugins/drools/impl/OutputFileWriter.java
[3]
https://github.com/maven-drools/plugin.maven-drools-plugin/blob/57c77fce26ceac41256e7f70c4e4daa2f411de4f/generic-integration-test-bundle/src/test/java/de/lightful/maven/plugins/drools/integrationtests/CanPerformMultiplePassesTest.java
[4]
https://github.com/maven-drools/plugin.knowledge-io/blob/a89bcf581d75b2ac8dfd55122c140568dbb8756a/src/main/java/de/lightful/maven/plugins/drools/knowledgeio/KnowledgePackageFile.java<https://github.com/maven-drools/plugin.maven-drools-plugin/blob/57c77fce26ceac41256e7f70c4e4daa2f411de4f/mojos/src/main/java/de/lightful/maven/plugins/drools/mojos/CompileMojo.java>
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