CODEWITHSUNDEEP
javadroolsjava-7rule-engine
Bala
Bala

Reputation: 4547

No support for Java 7 in Drools ("RuntimeDroolsException: value '1.7' is not a valid language level")

While I'm moving my project to java7, Drools starting throwing RuntimeDroolsException exception during init process. When i dig further, I found that this is happening when it validates java dialect.

The problem is: Drools 5.1.1 compares "java.version" system property with LANGUAGE_LEVELS to validate it. LANGUAGE_LEVELS is hard-coded list of java versions till 1.6 

In org.drools.rule.builder.dialect.java.JavaDialectConfiguration,
public static final String[]        LANGUAGE_LEVELS = new String[]{"1.5", "1.6"};

I didn't want to change the source code. So I added the below as a workaround to bypass java dialect validation. 

Properties properties = new Properties();
properties.setProperty( "drools.dialect.java.compiler.lnglevel","1.6" );
PackageBuilderConfiguration cfg =
new PackageBuilderConfiguration( properties );
KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(cfg);

Is there any better way of doing this other than editing source code?

P.S: Drools 5.1.1 is the latest production version of the drools

Upvotes: 5

Views: 13613

Answers (4)

ellisbjohns
ellisbjohns

Reputation: 103

I solved the above problem by replacing my referenced drools-complier.jar with the 5.4.0.Final version. I tried earlier releases of this jar but the same error resulted. This updated jar can be downloaded from the drools maven repo

Upvotes: 0

CHristian Bonami
CHristian Bonami

Reputation: 63

When you still want to use Drools 5.1.1 (switching to a higher version is not always easy because rules do not compile anymore), this might be another, non-programmatic workaround.

In META-INF/drools.packagebuilder.conf you can add these properties:

 drools.dialect.java.compiler = ECLIPSE 
 drools.dialect.java.lngLevel = 1.6 
 drools.dialect.java.compiler.lnglevel = 1.6

Upvotes: 6

Bala
Bala

Reputation: 4547

This is fixed in 5.2.1.FINAL version

https://issues.jboss.org/browse/JBRULES-3163

Upvotes: 3

Manfred Moser
Manfred Moser

Reputation: 29912

The best way would be submitting a patch to the project itself and helping them support Java 7 as well and then upgrading to that version once it is available.

Upvotes: -2

Related Questions