Hi, I am new to drools. I have created the new drools project in eclipse IDE 3.5. I have compiled it and tested it. it works fine. but when deploying, I have converted as a jar file and deployed it as part of tomcat server. When my tomcat is running i'm receiving the following error message. Please Note: 1. I'm using JBoss Drools Core 5.0.1 2. My Eclipse Version is 3.5.0 and it has org.eclipse.jdt.core_3.5.0.v_963.jar. I have placed this jar file on my class path. but still i'm facing the below problem 3. I would like to try the solution suggested on ((http://lists.jboss.org/pipermail/rules-users/2007-January/000195.html) ). Unfortunately i could not find the any downnload location for org.eclipse.jdt.core_3.2.0.v_671.jar 4.We have tried with the the solution suggested on (http://www.jboss.org/community/wiki/RulesTomcat ) for Drools 4.x Still we are not able to resolve the issue. java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/ eclipse/jdt/core/compiler/CategorizedProblem; org.drools.commons.jci.compilers.EclipseJavaCompiler $3.acceptResult(EclipseJavaCompiler.java:321) org .eclipse .jdt.internal.compiler.Compiler.handleInternalException(Compiler.java: 415) org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:352) org .drools .commons .jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:351) org .drools .commons .jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java: 51) org .drools .rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:389) org .drools .compiler .DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java: 56) org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:74) org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:690) org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:653) org .drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java: 290) org .drools .compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488) org .drools .builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25) Could you please help us to fix it? Thanks in advance. Thanks, Vadi