Details
Description
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:
Arrays.asList("a","b","c").forEach(System.out::println);
The rule compilation fails with the error:
[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
The problem can be worked around by adding a configuration file META-INF/kie.properties.conf containing the line:
drools.dialect.java.compiler.lnglevel = 1.8
The Drools compiler code will use this value instead of the System "java.version" value, avoiding the problem.
Attachments
Issue Links
- clones
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DROOLS-2305 Drools compiler does not recognize Java 9
- Closed