[jboss-jira] [JBoss JIRA] (DROOLS-1169) Running drools with OpenJDK9 (10 May 2016) gives "type java.lang.Object cannot be resolved" and "java.io.Serializable cannot be resolved" due to ECJ 2.5

[Geoffrey De Smet (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13390329#comment-13390329 ] 

Geoffrey De Smet commented on DROOLS-1169:
------------------------------------------

ECJ 4.6.1 is out, we should try it out to see if it fixes this issue.

> Running drools with OpenJDK9 (10 May 2016) gives "type java.lang.Object cannot be resolved" and "java.io.Serializable cannot be resolved" due to ECJ 2.5
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DROOLS-1169
>                 URL: https://issues.jboss.org/browse/DROOLS-1169
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>            Reporter: Geoffrey De Smet
>            Assignee: Mario Fusco
>              Labels: java9
>
> The code below runs perfectly with OpenJDK 8 (and even 6 and 7).
> To reproduce, use JDK 9 ( https://jdk9.java.net/download/ )  and in optaplanner-core, run XStreamXmlSolverFactoryTest [1] (or mostly any other test that builds a DRL file) to get this error:
> {code}
> 15:56:40.229 [main] ERROR o.d.c.k.b.impl.AbstractKieModule - Unable to build KieBaseModel:defaultKieBase
> Rule Compilation error : [Rule name='Conflict']
> 	org/optaplanner/core/api/solver/Rule_Conflict903142795.java (1:0) : The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
> 	org/optaplanner/core/api/solver/Rule_Conflict903142795.java (1:0) : The type java.io.Serializable cannot be resolved. It is indirectly referenced from required .class files
> 	org/optaplanner/core/api/solver/Rule_Conflict903142795.java (3:337) : Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor
> 	org/optaplanner/core/api/solver/Rule_Conflict903142795.java (6:569) : java.lang.Exception cannot be resolved to a type
> java.lang.IllegalStateException: There are errors in a score DRL:
> Error Messages:
> Message [id=1, level=ERROR, path=org/optaplanner/core/api/solver/testdataScoreRules.drl, line=31, column=0
>    text=Rule Compilation error The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
> The type java.io.Serializable cannot be resolved. It is indirectly referenced from required .class files
> Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor
> java.lang.Exception cannot be resolved to a type]
> {code}
> That tests builds this DRL:
> {code}
> package org.optaplanner.core.api.solver;
>     dialect "java"
> import org.optaplanner.core.api.score.buildin.simple.SimpleScoreHolder;
> import org.optaplanner.core.impl.testdata.domain.TestdataValue;
> import org.optaplanner.core.impl.testdata.domain.TestdataEntity;
> global SimpleScoreHolder scoreHolder;
> // ############################################################################
> // Constraints
> // ############################################################################
> rule "Conflict"
>     when
>         TestdataEntity(value != null, $leftValue : value)
>         TestdataEntity(value == $leftValue)
>     then
>         scoreHolder.addConstraintMatch(kcontext, -1);
> end
> {code}
> Not sure where the Object constructor reference comes from... This might be a JDK 9 upstream issue.
> Note: don't build drools with OpenJDK9 as that will fail sooner :)
> [1] https://github.com/droolsjbpm/optaplanner/blob/master/optaplanner-core/src/test/java/org/optaplanner/core/impl/solver/XStreamXmlSolverFactoryTest.java



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