[jboss-jira] [JBoss JIRA] (DROOLS-2305) Drools compiler does not recognize Java 9

[Jon Kranes (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-2305?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jon Kranes updated DROOLS-2305:
-------------------------------
    Steps to Reproduce: 
Create a default Drools kjar maven project.

Create a rule containing the RHS statement:

{code:java}
Arrays.asList("a","b","c").forEach(System.out::println);
{code}

Build the project using mvn -package using Java 9.



  was:
Create a default Drools kjar maven project.

Create a rule containing the RHS statement:

{code:java}
Arrays.asList("a","b","c").forEach(System.out::println);
{code}

Build the project using mvn -package.





> Drools compiler does not recognize Java 9
> -----------------------------------------
>
>                 Key: DROOLS-2305
>                 URL: https://issues.jboss.org/browse/DROOLS-2305
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 7.5.0.Final
>         Environment: 
>            Reporter: Jon Kranes
>            Assignee: Mario Fusco
>
> The Drools compiler class org.drools.compiler.rule.builder.dialect.java.JavaDialectConfiguration
>  does not include Java 9 as a valid language level.  Instead, when run using Java 9, the assumed java version is set to the default value of "1.7".
> As a consequence, when compiling a rules file requiring Java 8 specific language features, the compilation will fail.  For example, if a rule RHS contains the statement:
> {code:java}
> Arrays.asList("a","b","c").forEach(System.out::println);
> {code}
> The rule compilation fails with the error:
> {code:java}
> [ERROR] Unable to build KieBaseModel:default
> Rule Compilation error : [Rule name='test']
> 	defaultpkg/Rule_test959974052.java (7:387) : Method references are allowed only at source level 1.8 or above
> {code}
> The problem can be worked around by adding a configuration file META-INF/kie.properties.conf containing the line:
> {code:java}
> drools.dialect.java.compiler.lnglevel = 1.8
> {code}
> The Drools compiler code will use this value instead of the System "java.version" value, avoiding the problem.



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