Everyone who is good at constructing batch in java come here!

Question

Dear all,
recently i suffer so lots about null pointer exception in my batch program and i really want to konw the logic about launch a batch.
*(1)*blow is my code by brief:
public class CmlMBTUPFileConversationLZBatchABC extends CmlMBTUPFileConversationLZBatchABC_Gen {
     private static String filePathIn;
     private static FeatureConfiguration featureConfiguration;
     private static String failureCauses;
     public void validateSoftParameters(boolean arg0) {
          filePathIn = getParameters().getFILE_PATH_IN().trim();
          initlizeParam();
     private void initlizeParam() {
          Iterator<FeatureConfigurationOption> iterOptions = featureConfiguration.getOptions().iterator();
          FeatureConfigurationOption wfmOpt;
          while (iterOptions.hasNext()) {
               wfmOpt = (FeatureConfigurationOption) iterOptions.next();
               if (wfmOpt.getId().getOptionType().trim().equals(CmlMBTCaseCharacteristicLookup.constants.ENCODE_IN.trimmedValue())) {
                    failureCauses = wfmOpt.getValue().trim();
     public static class CmlMBTUPFileConversationLZBatchABCWorker extendsCmlMBTUPFileConversationLZBatchABCWorker_Gen {
          String st[] arr= failureCauses.split("/");
          public ThreadExecutionStrategy createExecutionStrategy() {
               // return new SingleTransactionStrategy(this);
               return new CommitEveryUnitStrategy(this);
public void initializeThreadWork(boolean initializationPreviouslySuccessful)throws ThreadAbortedException, RunAbortedException {}
          public WorkUnitResult executeWorkUnitDetailedResult(ThreadWorkUnit unit)throws ThreadAbortedException, RunAbortedException {}
*(2)*When i run the batch, some time it appears nullpointer exception, and i tack the cause: it's the variable failureCauses is null when running the code: String st[] arr = failureCauses.split("/");
so i solve the promble quickly: initialize the varible String st[] arr in the overrided method of initializeThreadWork;
Actually I konw the principle about the sequence of initialize inter static class and its outter class, its seems the exception would appear when inner class initalize before his outter class
*(3)* i'm afrid i will meet the same promble if i don't konw the sequece of initalization method in outter class and inner class,
and what i want to konw right now is:
would the override method named validateSoftParameters in outter batch class always before the inner work class's mehods? and the inner worker class's overrided method of initializeThreadWork? and it's would be great helpful to me for telling me the principle of launching a bach. any help would be appreciated.
Edited by: Eric ZHOU on 2010-8-6 下午11:54
Edited by: Eric ZHOU on 2010-8-7 上午1:20

Answer 1

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