OK, I upgraded to 4.0.2 and here is the updated error: java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult .getProblems()[Lorg/eclipse/jdt/core/compiler/CategorizedProblem; at org.drools.commons.jci.compilers.EclipseJavaCompiler$3.acceptResult(E clipseJavaCompiler.java:321) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:335) at org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJ avaCompiler.java:351) at org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(Abstrac tJavaCompiler.java:51) at org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDiale ct.java:332) at org.drools.compiler.DialectRegistry.compileAll(DialectRegistry.java:6 0) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:308 ) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.j ava:167) I have found this function in the file core-3.2.3.v_686_R32x.jar in the drools/lib directory for 4.2. One of the things that has happened recently is that I have upgraded from 3.2 to 3.3.1. I thought this might be part of the problem, but I looked at the core jar for 3.3.1 and it has the same method. The thing that puzzles me is that I'm not including the core file in my distribution, but if that's the problem, why am I not getting a ClassNotFoundException? Thanks. _____ From: Hehl, Thomas Sent: Monday, October 22, 2007 10:04 AM To: 'Rules Users List' Subject: NoSuchMethodError I am running 4.01 and I started get this exception on a new piece of code: java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult .getProblems()[Lorg/eclipse/jdt/core/compiler/CategorizedProblem; at org.drools.commons.jci.compilers.EclipseJavaCompiler$3.acceptResult(E clipseJavaCompiler.java:335) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:335) at org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJ avaCompiler.java:372) at org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(Abstrac tJavaCompiler.java:51) at org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDiale ct.java:332) at org.drools.compiler.DialectRegistry.compileAll(DialectRegistry.java:6 0) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:287 ) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.j ava:160) at com.acs.gs.juror.workflow.RulesBasedWorkflowManager.init(RulesBasedWo rkflowManager.java:114) It is blowing up on this line of code: builder.addPackageFromDrl( new StringReader(drl) ); Which is the drl created from the spreadsheet compiler on the decision table. This rules class has been tested thoroughly under junit. It wasn't until I deployed the library into my webapp that this issue turned up. Does anyone have any idea what I should be doing next? Thanks. Thom Hehl Sr. eJuror Architect * Office (859) 277-8800 x 144 * Thomas.Hehl(a)acs-inc.com <mailto:Thomas.Hehl@acs-inc.com> ACS, Inc. Government Solutions 1733 Harrodsburg Road Lexington, KY 40504-3617 This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message and notify sender via e-mail at Thomas.Hehl(a)acs-inc.com <mailto:Thomas.Hehl@acs-inc.com> or by telephone at 859-277-8800 ext. 144. Thank you.