[rules-users] Problems with BigDecimal on LHS

[Jason Mihalick]

I searched on the forum before I posted this and looked in JIRA.  It appears
that all problems like this with BigDecimal are thought to be resolved. 
However, I am having a problem that appears it may be attributed to Drools
using the BigDecimal( double ) constructor when converting decimal numbers
in the rules to a BigDecimal.

If you are able to reproduce this problem, what is the work around?  Use an
eval statement?

The rule does not fire in the following test:

package org.test;

import java.math.BigDecimal;

import org.drools.KnowledgeBase;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatelessKnowledgeSession;

public class BigDTest {

  public final static String RULE = 
    "package mypackage; " +
  	"import org.test.BigDTest;" +
  	"rule \"BigDecimal compare problem\" " +
  	"   when " +
  	"       BigDTest( bigDValue == 6.3 ) " +
  	"   then " +
  	"       System.out.println( \"Matched!\" ); " +
  	"   end"
  	;
  
  private BigDecimal bigDValue = new BigDecimal( "6.3" ) ; // Rule will fire
if this is changed to BigDecimal( 6.3 )
  
  public BigDecimal getBigDValue() {
    return bigDValue;
  }

  public void setBigDValue( BigDecimal bigDValue ) {
    this.bigDValue = bigDValue;
  }

  public static void main( String[] args ) {
    KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
    kbuilder.add( ResourceFactory.newByteArrayResource( RULE.getBytes() ),
ResourceType.DRL );
    if ( kbuilder.hasErrors() ) {
        System.err.println( kbuilder.getErrors().toString() );
    }
    
    KnowledgeBase kbase = kbuilder.newKnowledgeBase();
    
    StatelessKnowledgeSession ksession =
kbase.newStatelessKnowledgeSession();
    BigDTest bigDTest = new BigDTest();
    ksession.execute( bigDTest );
  }
}

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