I have a class and in that i have different conditions..based on each condition i have to call a separate method.so how do i configure rule in this case.since we dont have any if then else in easyrule. also i dont want to use one rule for each if condition.

[nagarajusattenapallikewill]

I have a class and in that i have different conditions..based on each condition i have to call a separate method.so how do i configure rule in this case.since we dont have any if then else in easyrule. also i dont want to use one rule for each if condition.Suggest me how to proceed in this case. Also i have a small question that will it support jdk1.6 or not??

Thank you in advance.

[fmbenhassine]

Hi,

Production systems and rules engine do not have "else" statement. You have to design one rule for the condition and another rule for "not condition". Here are some resources on that:

• "Productions consist of two parts: a sensory precondition (or "IF" statement) and an action (or "THEN")" [ source ]
• "These types of rules are used to represent behaviors of the type IF condition THEN action." [ source ]
• "Organize logic through a set of production rules, each having a condition and an action." [ source ]

I think even drools does not have "else" statement. An interesting answer here.

So Easy Rules is no exception to that.

Also i have a small question that will it support jdk1.6 or not??

Easy Rules v1.x requires Java 1.6+ . Easy Rules v2.x is compiled and tested with Java 7 but it should be fine with Java 6 too. Please let me know if you have any issue with that.

Kind regards Mahmoud

[nagarajusattenapallikewill]

Thanks a lot for the quick reply benas

Here is the exception which i am getting when i tried to run the sample program with jdk1.60._45 version

java.lang.UnsupportedClassVersionError: com/om/ruleengine/MainApp : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) Exception in thread "main"

Please suggest do i need to change anything.

[fmbenhassine]

No problem, you are welcome.

Please suggest do i need to change anything.

Either use Easy Rules v1.x with Java 6 or upgrade to Java 7 and use Easy Rules v2.x

[nagarajusattenapallikewill]

Even i tried with all other versions of easy rules.. like 1.3.0 , 2.0.0 , 2.10 , 2.2.0 Still i am facing the same issue.

[fmbenhassine]

Hi,

Here is a complete working example with easy rules 1.3 + java 1.6:

https://gist.github.com/benas/5d14f99dc85f431a85d48eeb8133997d

If you run the Main class, you should see: "it works" in the console.

Do you confirm?

Kind regards Mahmoud

[nagarajusattenapallikewill]

Thanks for the suggestion benas I will check and confirm.

[fmbenhassine]

Hi,

Have you got time to check?

Kind regards Mahmoud