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