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

[Jon Kranes (JIRA)]

Jon Kranes created DROOLS-2305:
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             Summary: 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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