Example usage for org.apache.hadoop.io.serializer SerializationFactory getDeserializer

Introduction

In this page you can find the example usage for org.apache.hadoop.io.serializer SerializationFactory getDeserializer.

Prototype

public <T> Deserializer<T> getDeserializer(Class<T> c) 

Source Link

Usage

From source file:co.cask.cdap.internal.app.runtime.batch.dataset.input.TaggedInputSplit.java

License:Apache License

@SuppressWarnings("unchecked")
@Override//w w w . j a v  a2 s .  c  o m
public void readFields(DataInput in) throws IOException {
    name = Text.readString(in);
    inputSplitClass = (Class<? extends InputSplit>) readClass(in);
    inputFormatClass = (Class<? extends InputFormat<?, ?>>) readClass(in);
    mapperClassName = Text.readString(in);
    inputConfigs = GSON.fromJson(Text.readString(in), STRING_STRING_MAP_TYPE);
    inputSplit = ReflectionUtils.newInstance(inputSplitClass, conf);
    SerializationFactory factory = new SerializationFactory(conf);
    Deserializer deserializer = factory.getDeserializer(inputSplitClass);
    deserializer.open((DataInputStream) in);
    inputSplit = (InputSplit) deserializer.deserialize(inputSplit);
}

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From source file:com.ambiata.ivory.operation.hadoop.TaggedInputSplit.java

License:Apache License

@SuppressWarnings("unchecked")
public void readFields(DataInput in) throws IOException {
    inputSplitClass = (Class<? extends InputSplit>) readClass(in);
    inputFormatClass = (Class<? extends InputFormat<?, ?>>) readClass(in);
    mapperClass = (Class<? extends Mapper<?, ?, ?, ?>>) readClass(in);
    inputSplit = (InputSplit) ReflectionUtils.newInstance(inputSplitClass, conf);
    SerializationFactory factory = new SerializationFactory(conf);
    Deserializer deserializer = factory.getDeserializer(inputSplitClass);
    deserializer.open((DataInputStream) in);
    inputSplit = (InputSplit) deserializer.deserialize(inputSplit);
}

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From source file:com.baynote.hadoop.TaggedInputSplit.java

License:Apache License

@SuppressWarnings("unchecked")
public void readFields(DataInput in) throws IOException {
    inputSplitClass = (Class<? extends InputSplit>) readClass(in);
    inputFormatClass = (Class<? extends InputFormat<?, ?>>) readClass(in);
    mapperClass = (Class<? extends Mapper<?, ?, ?, ?>>) readClass(in);
    inputSplit = ReflectionUtils.newInstance(inputSplitClass, conf);
    SerializationFactory factory = new SerializationFactory(conf);
    Deserializer deserializer = factory.getDeserializer(inputSplitClass);
    deserializer.open((DataInputStream) in);
    inputSplit = (InputSplit) deserializer.deserialize(inputSplit);
}

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From source file:com.chinamobile.bcbsp.bspstaff.BSPStaff.java

License:Apache License

/**
 * loadData: load data for the staff./*from w w w. ja  v  a  2  s .c  o  m*/
 * 
 * @param job
 *        BSP job configuration
 * @param workerAgent
 *        Protocol that staff child process uses to contact its parent process
 * @return boolean
 * @throws ClassNotFoundException
 * @throws IOException
 *         e
 * @throws InterruptedException
 *         e
 */
@SuppressWarnings("unchecked")
public boolean loadData(BSPJob job, WorkerAgentProtocol workerAgent, WorkerAgentForStaffInterface aStaffAgent)
        throws ClassNotFoundException, IOException, InterruptedException {
    // rebuild the input split
    RecordReader input = null;
    org.apache.hadoop.mapreduce.InputSplit split = null;
    if (rawSplitClass.equals("no")) {
        input = null;
    } else {

        DataInputBuffer splitBuffer = new DataInputBuffer();
        splitBuffer.reset(rawSplit.getBytes(), 0, rawSplit.getLength());
        SerializationFactory factory = new SerializationFactory(job.getConf());
        Deserializer<? extends org.apache.hadoop.mapreduce.InputSplit> deserializer = (Deserializer<? extends org.apache.hadoop.mapreduce.InputSplit>) factory
                .getDeserializer(job.getConf().getClassByName(rawSplitClass));
        deserializer.open(splitBuffer);
        split = deserializer.deserialize(null);

        // rebuild the InputFormat class according to the user configuration
        InputFormat inputformat = (InputFormat) ReflectionUtils.newInstance(
                job.getConf().getClass(Constants.USER_BC_BSP_JOB_INPUT_FORMAT_CLASS, InputFormat.class),
                job.getConf());
        inputformat.initialize(job.getConf());
        input = inputformat.createRecordReader(split, job);
        input.initialize(split, job.getConf());
    }
    SuperStepReportContainer ssrc = new SuperStepReportContainer();
    ssrc.setPartitionId(this.getPartition());
    this.numCopy = (int) (1 / (job.getConf().getFloat(Constants.USER_BC_BSP_JOB_BALANCE_FACTOR,
            Constants.USER_BC_BSP_JOB_BALANCE_FACTOR_DEFAULT)));
    ssrc.setNumCopy(numCopy);
    ssrc.setCheckNum(this.staffNum);
    StaffSSControllerInterface lsssc = new StaffSSController(this.getJobId(), this.getSid(), workerAgent);
    long start = System.currentTimeMillis();
    LOG.info("in BCBSP with PartitionType is: Hash" + " start time:" + start);
    if (this.staffNum == 1 || job.getConf().getBoolean(Constants.USER_BC_BSP_JOB_ISDIVIDE, false)) {

        this.partitioner = (Partitioner<Text>) ReflectionUtils.newInstance(
                job.getConf().getClass(Constants.USER_BC_BSP_JOB_PARTITIONER_CLASS, HashPartitioner.class),
                job.getConf());
        this.partitioner.setNumPartition(this.staffNum);
        this.partitioner.intialize(job, split);

        WritePartition writePartition = new NotDivideWritePartition();
        /*
         * RecordParse recordParse = (RecordParse) ReflectionUtils .newInstance(
         * job.getConf() .getClass( Constants.USER_BC_BSP_JOB_RECORDPARSE_CLASS,
         * RecordParseDefault.class), job .getConf()); recordParse.init(job);
         * //add by chen for null bug this.recordParse = recordParse;
         * //this.recordParse.init(job);
         */
        writePartition.setRecordParse(this.recordParse);
        writePartition.setStaff(this);
        writePartition.write(input);

        ssrc.setDirFlag(new String[] { "1" });
        ssrc.setCheckNum(this.staffNum);
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);

        LOG.info("The number of verteices from other staff" + " that cound not be parsed:" + this.lost);
        LOG.info("in BCBSP with PartitionType is:HASH" + " the number of HeadNode in this partition is:"
                + graphData.sizeForAll());

        graphData.finishAdd();
        ssrc.setCheckNum(this.staffNum * 2);
        ssrc.setDirFlag(new String[] { "2" });
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);

    } else {
        this.partitioner = (Partitioner<Text>) ReflectionUtils.newInstance(
                job.getConf().getClass(Constants.USER_BC_BSP_JOB_PARTITIONER_CLASS, HashPartitioner.class),
                job.getConf());

        WritePartition writePartition = (WritePartition) ReflectionUtils.newInstance(job.getConf().getClass(
                Constants.USER_BC_BSP_JOB_WRITEPARTITION_CLASS, HashWritePartition.class), job.getConf());
        int multiple = 1;
        if (writePartition instanceof HashWithBalancerWritePartition) {
            this.partitioner.setNumPartition(this.staffNum * numCopy);
            multiple = 2;
        } else {

            this.partitioner.setNumPartition(this.staffNum);
            multiple = 1;
            if (writePartition instanceof RangeWritePartition) {
                multiple = 2;
            }
        }
        this.partitioner.intialize(job, split);
        /*
         * RecordParse recordParse = (RecordParse) ReflectionUtils .newInstance(
         * job.getConf() .getClass( Constants.USER_BC_BSP_JOB_RECORDPARSE_CLASS,
         * RecordParseDefault.class), job .getConf()); recordParse.init(job); //
         * this.recordParse = (RecordParse) ReflectionUtils.newInstance( //
         * job.getConf().getClass( // Constants.USER_BC_BSP_JOB_RECORDPARSE_CLASS,
         * // RecordParseDefault.class), job.getConf()); //
         * this.recordParse.init(job); this.recordParse = recordParse;
         */
        writePartition.setPartitioner(partitioner);
        writePartition.setRecordParse(this.recordParse);
        writePartition.setStaff(this);
        writePartition.setWorkerAgent(aStaffAgent);
        writePartition.setSsrc(ssrc);
        writePartition.setSssc(lsssc);

        writePartition.setTotalCatchSize(job.getConf().getInt(Constants.USER_BC_BSP_JOB_TOTALCACHE_SIZE,
                Constants.USER_BC_BSP_JOB_TOTALCACHE_SIZE_DEFAULT));

        int threadNum = job.getConf().getInt(Constants.USER_BC_BSP_JOB_SENDTHREADNUMBER,
                Constants.USER_BC_BSP_JOB_SENDTHREADNUMBER_DEFAULT);
        if (threadNum > this.staffNum) {
            threadNum = this.staffNum - 1;
        }
        writePartition.setSendThreadNum(threadNum);
        writePartition.write(input);

        ssrc.setDirFlag(new String[] { "1" });
        ssrc.setCheckNum(this.staffNum * multiple);
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);

        LOG.info("The number of verteices from other staff that" + " cound not be parsed:" + this.lost);
        LOG.info("in BCBSP with PartitionType is:HASH" + " the number of HeadNode in this partition is:"
                + graphData.sizeForAll());

        graphData.finishAdd();

        ssrc.setCheckNum(this.staffNum * (multiple + 1));
        ssrc.setDirFlag(new String[] { "2" });
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);
    }

    long end = System.currentTimeMillis();
    LOG.info("in BCBSP with PartitionType is:HASH" + " end time:" + end);
    LOG.info(
            "in BCBSP with PartitionType is:HASH" + " using time:" + (float) (end - start) / 1000 + " seconds");

    return true;
}

---

From source file:com.chinamobile.bcbsp.bspstaff.BSPStaff.java

License:Apache License

/**
 * Rebuid the partition and read data from checkpoint for intializing.
 * //from w w w .  j av  a 2s.com
 * @param job
 * @param writePartition
 * @throws ClassNotFoundException
 * @throws IOException
 */
private void intializePartitionForRecovery(BSPJob job, WritePartition writePartition)
        throws ClassNotFoundException, IOException {
    this.currentSuperStepCounter = ssc.getNextSuperStepNum();
    LOG.info("Now, this super step count is " + this.currentSuperStepCounter);
    this.partitioner = (Partitioner<Text>) ReflectionUtils.newInstance(
            job.getConf().getClass(Constants.USER_BC_BSP_JOB_PARTITIONER_CLASS, HashPartitioner.class),
            job.getConf());

    if (writePartition instanceof HashWithBalancerWritePartition) {
        this.partitioner.setNumPartition(this.staffNum * numCopy);
    } else {
        this.partitioner.setNumPartition(this.staffNum);
    }
    org.apache.hadoop.mapreduce.InputSplit split = null;
    if (rawSplitClass.equals("no")) {

    } else {

        DataInputBuffer splitBuffer = new DataInputBuffer();
        splitBuffer.reset(rawSplit.getBytes(), 0, rawSplit.getLength());
        SerializationFactory factory = new SerializationFactory(job.getConf());
        Deserializer<? extends org.apache.hadoop.mapreduce.InputSplit> deserializer = (Deserializer<? extends org.apache.hadoop.mapreduce.InputSplit>) factory
                .getDeserializer(job.getConf().getClassByName(rawSplitClass));
        deserializer.open(splitBuffer);
        split = deserializer.deserialize(null);
    }
    this.partitioner.intialize(job, split);
    displayFirstRoute();
}

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From source file:com.chinamobile.bcbsp.bspstaff.BSPStaff.java

License:Apache License

/**
 * loadData: load data for the staff in SGA-Graph.
 * /* w  w w .  j  a  v  a 2s  . c  om*/
 * @param job
 *        BSP job configuration
 * @param workerAgent
 *        Protocol that staff child process uses to contact its parent process
 * @return boolean
 * @throws ClassNotFoundException
 * @throws IOException
 *         e
 * @throws InterruptedException
 *         e
 */
@SuppressWarnings("unchecked")
public boolean loadDataSGAGraph(BSPJob job, WorkerAgentProtocol workerAgent,
        WorkerAgentForStaffInterface aStaffAgent)
        throws ClassNotFoundException, IOException, InterruptedException {
    // rebuild the input split
    RecordReader input = null;
    org.apache.hadoop.mapreduce.InputSplit split = null;
    if (rawSplitClass.equals("no")) {
        input = null;
    } else {
        DataInputBuffer splitBuffer = new DataInputBuffer();
        splitBuffer.reset(rawSplit.getBytes(), 0, rawSplit.getLength());
        SerializationFactory factory = new SerializationFactory(job.getConf());
        Deserializer<? extends org.apache.hadoop.mapreduce.InputSplit> deserializer = (Deserializer<? extends org.apache.hadoop.mapreduce.InputSplit>) factory
                .getDeserializer(job.getConf().getClassByName(rawSplitClass));
        deserializer.open(splitBuffer);
        split = deserializer.deserialize(null);

        // rebuild the InputFormat class according to the user configuration
        InputFormat inputformat = (InputFormat) ReflectionUtils.newInstance(
                job.getConf().getClass(Constants.USER_BC_BSP_JOB_INPUT_FORMAT_CLASS, InputFormat.class),
                job.getConf());
        inputformat.initialize(job.getConf());
        input = inputformat.createRecordReader(split, job);
        input.initialize(split, job.getConf());
    }
    SuperStepReportContainer ssrc = new SuperStepReportContainer();
    ssrc.setPartitionId(this.getPartition());
    this.numCopy = (int) (1 / (job.getConf().getFloat(Constants.USER_BC_BSP_JOB_BALANCE_FACTOR,
            Constants.USER_BC_BSP_JOB_BALANCE_FACTOR_DEFAULT)));
    ssrc.setNumCopy(numCopy);
    ssrc.setCheckNum(this.staffNum);
    StaffSSControllerInterface lsssc = new StaffSSController(this.getJobId(), this.getSid(), workerAgent);
    long start = System.currentTimeMillis();
    LOG.info("in BCBSP with PartitionType is: Hash" + " start time:" + start);
    if (this.staffNum == 1 || job.getConf().getBoolean(Constants.USER_BC_BSP_JOB_ISDIVIDE, false)) {

        this.partitioner = (Partitioner<Text>) ReflectionUtils.newInstance(
                job.getConf().getClass(Constants.USER_BC_BSP_JOB_PARTITIONER_CLASS, HashPartitioner.class),
                job.getConf());
        this.partitioner.setNumPartition(this.staffNum);
        this.partitioner.intialize(job, split);

        WritePartition writePartition = new NotDivideWritePartition();
        /*
         * RecordParse recordParse = (RecordParse) ReflectionUtils .newInstance(
         * job.getConf() .getClass( Constants.USER_BC_BSP_JOB_RECORDPARSE_CLASS,
         * RecordParseDefault.class), job .getConf()); recordParse.init(job);
         * //add by chen for null bug this.recordParse = recordParse;
         * //this.recordParse.init(job);
         */
        writePartition.setRecordParse(this.recordParse);
        writePartition.setStaff(this);
        writePartition.write(input);

        ssrc.setDirFlag(new String[] { "1" });
        ssrc.setCheckNum(this.staffNum);
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);

        LOG.info("The number of verteices from other staff" + " that cound not be parsed:" + this.lost);
        LOG.info("in BCBSP with PartitionType is:HASH" + " the number of HeadNode in this partition is:"
                + graphData.sizeForAll());

        graphData.finishAdd();
        ssrc.setCheckNum(this.staffNum * 2);
        ssrc.setDirFlag(new String[] { "2" });
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);

    } else {
        this.partitioner = (Partitioner<Text>) ReflectionUtils.newInstance(
                job.getConf().getClass(Constants.USER_BC_BSP_JOB_PARTITIONER_CLASS, HashPartitioner.class),
                job.getConf());

        WritePartition writePartition = (WritePartition) ReflectionUtils.newInstance(job.getConf().getClass(
                Constants.USER_BC_BSP_JOB_WRITEPARTITION_CLASS, HashWritePartition.class), job.getConf());
        int multiple = 1;
        if (writePartition instanceof HashWithBalancerWritePartition) {
            this.partitioner.setNumPartition(this.staffNum * numCopy);
            multiple = 2;
        } else {

            this.partitioner.setNumPartition(this.staffNum);
            multiple = 1;
            if (writePartition instanceof RangeWritePartition) {
                multiple = 2;
            }
        }
        this.partitioner.intialize(job, split);
        /*
         * RecordParse recordParse = (RecordParse) ReflectionUtils .newInstance(
         * job.getConf() .getClass( Constants.USER_BC_BSP_JOB_RECORDPARSE_CLASS,
         * RecordParseDefault.class), job .getConf()); recordParse.init(job); //
         * this.recordParse = (RecordParse) ReflectionUtils.newInstance( //
         * job.getConf().getClass( // Constants.USER_BC_BSP_JOB_RECORDPARSE_CLASS,
         * // RecordParseDefault.class), job.getConf()); //
         * this.recordParse.init(job); this.recordParse = recordParse;
         */
        writePartition.setPartitioner(partitioner);
        writePartition.setRecordParse(this.recordParse);
        writePartition.setStaff(this);
        writePartition.setWorkerAgent(aStaffAgent);
        writePartition.setSsrc(ssrc);
        writePartition.setSssc(lsssc);

        writePartition.setTotalCatchSize(job.getConf().getInt(Constants.USER_BC_BSP_JOB_TOTALCACHE_SIZE,
                Constants.USER_BC_BSP_JOB_TOTALCACHE_SIZE_DEFAULT));

        int threadNum = job.getConf().getInt(Constants.USER_BC_BSP_JOB_SENDTHREADNUMBER,
                Constants.USER_BC_BSP_JOB_SENDTHREADNUMBER_DEFAULT);
        if (threadNum > this.staffNum) {
            threadNum = this.staffNum - 1;
        }
        writePartition.setSendThreadNum(threadNum);
        writePartition.write(input);

        ssrc.setDirFlag(new String[] { "1" });
        ssrc.setCheckNum(this.staffNum * multiple);
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);

        LOG.info("The number of verteices from other staff that" + " cound not be parsed:" + this.lost);
        LOG.info("in BCBSP with PartitionType is:HASH" + " the number of HeadNode in this partition is:"
                + graphData.sizeForAll());

        graphData.finishAdd();

        ssrc.setCheckNum(this.staffNum * (multiple + 1));
        ssrc.setDirFlag(new String[] { "2" });
        lsssc.loadDataBarrier(ssrc, Constants.PARTITION_TYPE.HASH);
        // for input graph evaluate.
        // this.evaluateflag = lsssc.graphEvaluateBarrier(0, this.staffNum,
        // this.graphData.getGlobalFactor());
    }

    long end = System.currentTimeMillis();
    LOG.info("in BCBSP with PartitionType is:HASH" + " end time:" + end);
    LOG.info(
            "in BCBSP with PartitionType is:HASH" + " using time:" + (float) (end - start) / 1000 + " seconds");

    return true;
}

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From source file:com.cloudera.crunch.impl.mr.run.CrunchInputSplit.java

License:Apache License

public void readFields(DataInput in) throws IOException {
    nodeIndex = in.readInt();//from  w w w. j  av  a  2s  . c o m
    inputFormatClass = (Class<? extends InputFormat>) readClass(in);
    Class<? extends InputSplit> inputSplitClass = (Class<? extends InputSplit>) readClass(in);
    inputSplit = (InputSplit) ReflectionUtils.newInstance(inputSplitClass, conf);
    SerializationFactory factory = new SerializationFactory(conf);
    Deserializer deserializer = factory.getDeserializer(inputSplitClass);
    deserializer.open((DataInputStream) in);
    inputSplit = (InputSplit) deserializer.deserialize(inputSplit);
}

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From source file:com.datasalt.pangool.tuplemr.mapred.lib.input.TaggedInputSplit.java

License:Apache License

@SuppressWarnings("unchecked")
public void readFields(DataInput in) throws IOException {
    inputSplitClass = (Class<? extends InputSplit>) readClass(in);
    inputFormatFile = Text.readString(in);
    inputProcessorFile = Text.readString(in);
    inputSplit = (InputSplit) ReflectionUtils.newInstance(inputSplitClass, conf);
    SerializationFactory factory = new SerializationFactory(conf);
    Deserializer deserializer = factory.getDeserializer(inputSplitClass);
    deserializer.open((DataInputStream) in);
    inputSplit = (InputSplit) deserializer.deserialize(inputSplit);
}

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From source file:com.datatorrent.demos.mroperator.MapOperator.java

License:Open Source License

@Override
public void setup(OperatorContext context) {
    if (context != null) {
        operatorId = context.getId();/*  w  w  w.  j av  a  2 s. c om*/
    }
    reporter = new ReporterImpl(ReporterType.Mapper, new Counters());
    outputCollector = new OutputCollectorImpl<K2, V2>();
    Configuration conf = new Configuration();
    try {
        inputFormat = inputFormatClass.newInstance();
        SerializationFactory serializationFactory = new SerializationFactory(conf);
        Deserializer keyDesiralizer = serializationFactory.getDeserializer(inputSplitClass);
        keyDesiralizer.open(new ByteArrayInputStream(outstream.toByteArray()));
        inputSplit = (InputSplit) keyDesiralizer.deserialize(null);
        ((ReporterImpl) reporter).setInputSplit(inputSplit);
        reader = inputFormat.getRecordReader(inputSplit, new JobConf(conf), reporter);
    } catch (Exception e) {
        logger.info("failed to initialize inputformat obj {}", inputFormat);
        throw new RuntimeException(e);
    }
    InputStream stream = null;
    if (configFile != null && configFile.length() > 0) {
        stream = ClassLoader.getSystemResourceAsStream("/" + configFile);
        if (stream == null) {
            stream = ClassLoader.getSystemResourceAsStream(configFile);
        }
    }
    if (stream != null) {
        conf.addResource(stream);
    }
    jobConf = new JobConf(conf);
    if (mapClass != null) {
        try {
            mapObject = mapClass.newInstance();
        } catch (Exception e) {
            logger.info("can't instantiate object {}", e.getMessage());
        }

        mapObject.configure(jobConf);
    }
    if (combineClass != null) {
        try {
            combineObject = combineClass.newInstance();
        } catch (Exception e) {
            logger.info("can't instantiate object {}", e.getMessage());
        }
        combineObject.configure(jobConf);
    }
}

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From source file:com.google.appengine.tools.mapreduce.SerializationUtil.java

License:Apache License

/**
 * Deserialize an object from a byte array. This uses {@code conf}'s
 * serialization preferences to support arbitrary serialization mechanisms
 * using {@link SerializationFactory}./*from w ww.  j a  va 2  s.c  o m*/
 *
 * @param conf the configuration to use for serialization preferences
 * @param expectedClass a type token to set the return type
 * @param className the name of the class to deserialize to
 * @param toDeserialize the serialized object as a byte array
 * @param initialState an object with initial state. Some deserializers may
 * throw this away. You can pass {@code null} to signify that there is no
 * initial state.
 */
@SuppressWarnings("unchecked")
public static <T> T deserializeFromByteArray(Configuration conf, Class<T> expectedClass, String className,
        byte[] toDeserialize, T initialState) {
    log.fine("Trying to deserialize: " + className);
    SerializationFactory serializationFactory = new SerializationFactory(conf);
    try {
        Class<?> deserializationClass = conf.getClassByName(className);
        if (!expectedClass.isAssignableFrom(deserializationClass)) {
            throw new ClassCastException("Attempted to deserialize a " + deserializationClass.getCanonicalName()
                    + " but expected a " + expectedClass.getCanonicalName());
        }
        Deserializer<T> deserializer = serializationFactory.getDeserializer((Class<T>) deserializationClass);
        ByteArrayInputStream inputStream = new ByteArrayInputStream(toDeserialize);
        deserializer.open(inputStream);
        return deserializer.deserialize(initialState);
    } catch (ClassNotFoundException e) {
        // If we're deserializing, then we should have already seen this class
        // and this is strictly a programming error. Hence the RuntimeException.
        throw new RuntimeException("Couldn't get class for deserializing " + className, e);
    } catch (UnsupportedEncodingException e) {
        throw new RuntimeException("JDK doesn't understand UTF8", e);
    } catch (IOException e) {
        throw new RuntimeException("Got an IOException from a ByteArrayInputStream. This should never happen.",
                e);
    }
}

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