hi , I am using maven, I tried to upgrade to the latest release be just changing the dools pom version number to 4.0.5 After the upgrade execution fails with the following stack trace: ... java.lang.NoClassDefFoundError: org/mvel/AbstractParser at org.drools.rule.builder.dialect.mvel.MVELDialect.setLanguageLevel(MVELDialect.java:128) at org.drools.rule.builder.dialect.java.AbstractJavaBuilder.<clinit>(AbstractJavaBuilder.java:26) at org.drools.rule.builder.dialect.java.JavaDialect.<init>(JavaDialect.java:78) at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.getDialect(JavaDialectConfiguration.java:62) at org.drools.compiler.PackageBuilderConfiguration.buildDialectRegistry(PackageBuilderConfiguration.java:175) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:142) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:86) ...... has anyone successfully switched to the latest version using the maven2 poms? thanks in advance, c)hristian