Runtime Exception ------------------ Key: DROOLS-1610 URL: https://issues.jboss.org/browse/DROOLS-1610 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.5.0.Final Reporter: Salman Khan Assignee: Mario Fusco Getting the following exception while trying to implement Drools in Android. 06-08 12:25:41.660 19177-19177/com.example.admin23.droolstest W/System.err: java.lang.RuntimeException: Unable to instantiate object for class 'org.drools.android.DexPackageClassLoader' with constructor public org.drools.android.DexPackageClassLoader(org.drools.core.rule.JavaDialectRuntimeData,java.lang.ClassLoader) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.core.util.ClassUtils.instantiateObject(ClassUtils.java:272) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.core.rule.JavaDialectRuntimeData.makeClassLoader(JavaDialectRuntimeData.java:618) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.core.rule.JavaDialectRuntimeData.onAdd(JavaDialectRuntimeData.java:243) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.rule.builder.dialect.java.JavaDialect.<init>(JavaDialect.java:187) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.rule.builder.dialect.java.JavaDialectConfiguration.newDialect(JavaDialectConfiguration.java:91) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl.buildDialectRegistry(KnowledgeBuilderConfigurationImpl.java:392) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.compiler.PackageRegistry.<init>(PackageRegistry.java:55) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.newPackage(KnowledgeBuilderImpl.java:1571) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.initPackageRegistry(KnowledgeBuilderImpl.java:1044) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.createPackageRegistry(KnowledgeBuilderImpl.java:1015) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.initPackageRegistries(CompositeKnowledgeBuilderImpl.java:297) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackages(CompositeKnowledgeBuilderImpl.java:116) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:105) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.kie.builder.impl.AbstractKieModule.buildKnowledgePackages(AbstractKieModule.java:244) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:64) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:230) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:198) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at com.example.admin23.droolstest.MainActivity.onCreate(MainActivity.java:143) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.app.Activity.performCreate(Activity.java:6876) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.app.ActivityThread.access$1100(ActivityThread.java:221) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.os.Looper.loop(Looper.java:158) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at android.app.ActivityThread.main(ActivityThread.java:7224) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at java.lang.reflect.Method.invoke(Native Method) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: Caused by: java.lang.reflect.InvocationTargetException 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at java.lang.reflect.Constructor.newInstance(Native Method) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.core.util.ClassUtils.instantiateObject(ClassUtils.java:270) 06-08 12:25:41.670 19177-19177/com.example.admin23.droolstest W/System.err: ... 29 more 06-08 12:25:41.680 19177-19177/com.example.admin23.droolstest W/System.err: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.io.File.getAbsolutePath()' on a null object reference 06-08 12:25:41.680 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.android.MultiDexClassLoader.<init>(MultiDexClassLoader.java:70) 06-08 12:25:41.680 19177-19177/com.example.admin23.droolstest W/System.err: at org.drools.android.DexPackageClassLoader.<init>(DexPackageClassLoader.java:44) 06-08 12:25:41.680 19177-19177/com.example.admin23.droolstest W/System.err: ... 31 more Whenever I'm trying to call kieBuilder.buildAll(); method it's giving me the exception rather giving the result array. Please help to resolve this. Any help would be appreciable. Thanks in advance.