Hi All, I am trying to build a sample drools project using ant and getting the below error. I am using "drools-distribution-5.4.0.Final" release jars in my project. Unable to get this issue resolved as not sure what really went wrong. RuleBaseTask failed: Unable to load dialect 'org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration:mvel:org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration' at org.drools.contrib.DroolsCompilerAntTask.execute(DroolsCompilerAntTask.java:159) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:357) at org.apache.tools.ant.Target.performTasks(Target.java:385) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) at org.apache.tools.ant.Project.executeTarget(Project.java:1307) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:33) at org.apache.tools.ant.Project.executeTargets(Project.java:1191) at org.eclipse.ant.internal.launching.remote.InternalAntRunner.run(InternalAntRunner.java:423) at org.eclipse.ant.internal.launching.remote.InternalAntRunner.main(InternalAntRunner.java:137) Caused by: org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration:mvel:org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration' at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:313) at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:298) at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:187) at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:140) at org.drools.contrib.DroolsCompilerAntTask.getPackageBuilder(DroolsCompilerAntTask.java:556) at org.drools.contrib.DroolsCompilerAntTask.createWithPackageBuilder(DroolsCompilerAntTask.java:266) at org.drools.contrib.DroolsCompilerAntTask.execute(DroolsCompilerAntTask.java:156) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:357) at org.apache.tools.ant.Target.performTasks(Target.java:385) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) at org.apache.tools.ant.Project.executeTarget(Project.java:1306) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32) at org.apache.tools.ant.Project.executeTargets(Project.java:1189) ... 2 more Caused by: java.lang.ClassCastException: org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:308) at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:298) at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:189) at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:142) at org.drools.contrib.DroolsCompilerAntTask.getPackageBuilder(DroolsCompilerAntTask.java:558) at org.drools.contrib.DroolsCompilerAntTask.createWithPackageBuilder(DroolsCompilerAntTask.java:266) at org.drools.contrib.DroolsCompilerAntTask.execute(DroolsCompilerAntTask.java:156) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:357) at org.apache.tools.ant.Target.performTasks(Target.java:385) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337) at org.apache.tools.ant.Project.executeTarget(Project.java:1307) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:33) at org.apache.tools.ant.Project.executeTargets(Project.java:1191) ... 2 more Below is the list of jars added to my classpath, -------------------------------------------- antlr-runtime.jar drools-ant-5.4.0.Final.jar drools-compiler-5.4.0.Final.jar drools-core-5.4.0.Final.jar drools-decisiontables-5.4.0.Final.jar drools-jsr94-5.4.0.Final.jar drools-persistence-jpa-5.4.0.Final.jar drools-templates-5.4.0.Final.jar drools-verifier-5.4.0.Final.jar droolsjbpm-ide-common-5.4.0.Final.jar jbpm-bpmn2.jar jbpm-flow-builder.jar jbpm-flow.jar jsr94.jar junit.jar jxl.jar knowledge-api.jar knowledge-internal-api.jar mvel2.jar org.eclipse.jdt.core_3.6.1.v_A68_R36x.jar xmlpull.jar xpp3_min.jar xstream.jar build.xml --------- <project name="DroolsProto" default="dist" basedir="."> <property name="build.src" location="src"/> <property name="build.target" location="target"/> <property name="build.dist" location="dist"/> <path id="build.lib.path"> <fileset dir="${build.src}/lib"> <include name="**/*.jar"/> </fileset> </path> <taskdef name="droolscompiler" classname="org.drools.contrib.DroolsCompilerAntTask"> <classpath refid="build.lib.path"/> </taskdef> <target name="clean"> <delete dir="${build.target}"/> <delete dir="${build.dist}"/> </target> <target name="init"> <tstamp/> <mkdir dir="${build.target}"/> <mkdir dir="${build.dist}"/> <record name="build.log" loglevel="verbose" append="false"/> </target> <target name="compile" depends="init"> <mkdir dir="${build.target}/classes"/> <javac srcdir="${build.src}/main/java" destdir="${build.target}/classes"> <classpath refid="build.lib.path"/> <include name="**/*.java"/> </javac> </target> <target name="compile-rules"> <property name="pathelements" refid="build.lib.path"/> <droolscompiler srcDir="${build.src}/main/rules" toFile="${build.target}/classes/drl.pkg" classpathref="build.lib.path"> <include name="*.drl" /> </droolscompiler> </target> <target name="bundle-resources" depends="compile-rules"> <copy todir="${build.target}/classes"> <fileset dir="${build.src}/main/resources"/> </copy> </target> <target name="dist" depends="compile,bundle-resources"/> </project> Thanks in advance, Suresh -- View this message in context: http://drools.46999.n3.nabble.com/ClasscastException-in-drools-ant-task-t... 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