[jboss-jira] [JBoss JIRA] (DROOLS-1169) Running drools with OpenJDK9 (May 2016) gives

[Geoffrey De Smet (JIRA)]

Geoffrey De Smet created DROOLS-1169:
----------------------------------------

             Summary: Running drools with OpenJDK9 (May 2016) gives 
                 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


The code below runs perfectly with OpenJDK 8 (and even 6 and 7).

To reproduce, use JDK 9 ( https://jdk9.java.net/download/ )  and run XStreamXmlSolverFactoryTest in optaplanner-core 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 :)



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