?
Solved

Running a new drools project in Eclipse 3.2

Posted on 2006-07-19
10
Medium Priority
?
761 Views
Last Modified: 2012-08-14
hi!  

Has anybody worked on eclipse IDE on drools rule engine?  I add the plugin in 3.2 and created a new drools project.  It comes with a drl file  "Rule.java.drl"  and a test file (with a main class in it) "DroolsTest.java".  The project should run as it is acorrding to docs but is giving an error

"could not find main class, program will exit"

Somehow cannot find the main class?  Any clue why? I think I have all the classpath set.

0
Comment
Question by:subirc
  • 5
  • 5
10 Comments
 

Author Comment

by:subirc
ID: 17137558
Any help appreciated --- thanks!!! I must be missing something in eclipse configuration

0
 
LVL 30

Expert Comment

by:Mayank S
ID: 17137981
How exactly are you running? Did you right-click on DroolsTest.java and select Run As -> Java Application, or select from the Run menu -> Run As -> Java Application.
0
 

Author Comment

by:subirc
ID: 17143680
Tried both -  didn't work either way
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:subirc
ID: 17143860
This is the error I am getting.....

java.lang.UnsupportedClassVersionError: org/drools/RuleBase (Unsupported major.minor version 49.0)
      at java.lang.ClassLoader.defineClass0(Native Method)
      at java.lang.ClassLoader.defineClass(Unknown Source)
      at java.security.SecureClassLoader.defineClass(Unknown Source)
      at java.net.URLClassLoader.defineClass(Unknown Source)
      at java.net.URLClassLoader.access$100(Unknown Source)
      at java.net.URLClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Exception in thread "main"
0
 
LVL 30

Accepted Solution

by:
Mayank S earned 120 total points
ID: 17143865
Oh then its a version error. That class was developed for a different version of Java and your default version in the Eclipse project is something else. Try changing the JRE in Eclipse (for this project) to point to another version.
0
 

Author Comment

by:subirc
ID: 17143984
do you mean jdk1.5?  I have 1.4.2 and I also tried with the IMB_jre that comes when you install Websphere........
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 17144032
Well I'm not sure which version drools needs. Maybe it needs Java 5 - you can try installing the runtime for that from Sun's site http://java.sun.com/j2se/ and configure it with Eclipse (you can have multiple JREs installed on a machine but the one that matters for Eclipse is the one the project is configured with).
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 17144345
Which version did you try?
0
 

Author Comment

by:subirc
ID: 17145596
jre 1.5.0_04  from sun  
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 17145727
Any reason for the B grade?
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
Suggested Courses
Course of the Month17 days, 10 hours left to enroll

831 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question