receiving serialized arraylist in android

StackOverflow https://stackoverflow.com/questions/23430934

题

I am trying to get an serialized ArrayList that contains objects from java server, but when I do the deserialization in the android application and error occur.

So I have:

  • ArrayList
  • Each Vote contains an ArrayList
  • Each Choice contains EncryptedInteger object

Vote class 

    package entities;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Vote implements Serializable {

    private static final long serialVersionUID = 2L;
    private int voteId;
    private int surveyId;
    private int voterId;
    private List<Choice> choices;
    private boolean counted;


    public Vote(){

    }

    public Vote(int voteId,int surveyId,int voterId, boolean counted){
        this.voteId=voteId;
        this.surveyId=surveyId;
        this.voterId=voterId;
        this.choices = new ArrayList<Choice>();
        this.counted=counted;
    }

    public void addChoice(Choice choice) {
        choices.add(choice);
    }

    public int getVoteId() {
        return voteId;
    }

    public void setVoteId(int voteId) {
        this.voteId = voteId;
    }

    public int getSurveyId() {
        return surveyId;
    }

    public void setSurveyId(int surveyId) {
        this.surveyId = surveyId;
    }

    public int getVoterId() {
        return voterId;
    }

    public void setVoterId(int voterId) {
        this.voterId = voterId;
    }

    public List<Choice> getChoices() {
        return choices;
    }

    public void setChoices(List<Choice> choices) {
        this.choices = choices;
    }

    public boolean isCounted() {
        return counted;
    }

    public void setCounted(boolean counted) {
        this.counted = counted;
    }


}

AND this object contains an arraylist of choices

Choice class 

    package entities;

import java.io.Serializable;

import thep.paillier.EncryptedInteger;

public class Choice implements Serializable  {
private static final long serialVersionUID = 2L;
  private EncryptedInteger encryptedInteger;
  private int questionNumber;
  private int optionNumber;
  private double S;


public Choice(EncryptedInteger encryptedInteger, int questionNumber,
        int optionNumber, double s) {

    this.encryptedInteger = encryptedInteger;
    this.questionNumber = questionNumber;
    this.optionNumber = optionNumber;
    S = s;
}
public EncryptedInteger getEncryptedInteger() {
    return encryptedInteger;
}
public void setEncryptedInteger(EncryptedInteger encryptedInteger) {
    this.encryptedInteger = encryptedInteger;
}
public int getQuestionNumber() {
    return questionNumber;
}
public void setQuestionNumber(int questionNumber) {
    this.questionNumber = questionNumber;
}
public int getOptionNumber() {
    return optionNumber;
}
public void setOptionNumber(int optionNumber) {
    this.optionNumber = optionNumber;
}
public double getS() {
    return S;
}
public void setS(double s) {
    S = s;
}

}

The code the will create the arraylist

@Path("/vote")
public class GenerateNumberRequest {

    @POST
    @Path("/GNA")
    @Consumes("application/x-www-form-urlencoded")
    public Response GNApost(MultivaluedMap<String, String> form,
            @Context HttpServletResponse httpResponse) {
        int voteId = Integer.parseInt(form.getFirst("voteId"));
        String generateNumberAuthenticator = form
                .getFirst("generateNumberAuthenticator");

        SurveyKey key = null;
        VoteAuthenticator authenticator = null;
        VoterVerifierRepository voterVerifierRepository = new VoterVerifierRepository();
        VoteAuthenticatorRepository voteAuthenticatorRepository = new VoteAuthenticatorRepository();
        SurveyKeyRepository surveyKeyRepository = new SurveyKeyRepository();
        try {
            authenticator = voteAuthenticatorRepository
                    .getVoteAuthenticator(voteId);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        int surveyId = authenticator.getSurveyId();
        SurveyCommunication surveyCommunication = new SurveyCommunication(
                surveyId);

        Survey survey = surveyCommunication.getSurvey();
        try {
            key = surveyKeyRepository.getSurveyKey(surveyId);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        List<Vote> votes = new ArrayList<Vote>();

        Vote voteZero = new Vote(authenticator.getVoteId(),
                authenticator.getSurveyId(), authenticator.getVoterId(), false);
        Vote voteOne = new Vote(authenticator.getVoteId(),
                authenticator.getSurveyId(), authenticator.getVoterId(), false);
        Random random = new Random();
        double s1, s2, s3;
        PublicKey publicKey = key.getPublicKey();
        EncryptedInteger encryptedZero = null;
        EncryptedInteger encryptedOne = null;
        for (Question q : survey.getAllQuestions()) {
            for (Option o : q.getOptions()) {
                s1 = random.nextInt() % 10000;
                s2 = -(s1 * key.getX()) / key.getY();
                s3 = (1 - (s1 * key.getX())) / key.getY();

                try {
                    encryptedZero = new EncryptedInteger(BigInteger.ZERO,
                            publicKey);
                    encryptedOne = new EncryptedInteger(BigInteger.ONE,
                            publicKey);
                } catch (BigIntegerClassNotValid e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                voteZero.addChoice(new Choice(encryptedZero, q.getqID(), o
                        .getOptionNumaricalValue(), s2));
                voteOne.addChoice(new Choice(encryptedOne, q.getqID(), o
                        .getOptionNumaricalValue(), s3));
            }
        }

        votes.add(voteZero);
        votes.add(voteOne);

        ByteArrayOutputStream b = new ByteArrayOutputStream();
        ObjectOutputStream o;
        try {
            o = new ObjectOutputStream(b);
            o.writeObject(votes);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return Response.status(200).entity(b.toByteArray()).build();

    }
}

android code 

    package com.example.connection;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

import entities.Vote;

public class GenerateNumberConnection {

    static HttpClient httpClient;
    static HttpPost httpPost;
    static HttpResponse response;

    @SuppressWarnings("unchecked")
    public static List<Vote> getVotes(String voteId, String GNA) {
        httpClient = HttpObjects.getHttpClient();
        httpPost = new HttpPost(
                "http://192.168.100.4:8181/trustee/APP/vote/GNA");

        List<Vote> votes = null;
        ArrayList<NameValuePair> postParameters;

        postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("voteId", voteId));
        postParameters.add(new BasicNameValuePair(
                "generateNumberAuthenticator", GNA));

        try {
            httpPost.setEntity(new UrlEncodedFormEntity(postParameters));
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            byte[] responseByte = null;
            responseByte = EntityUtils.toByteArray(entity);
            ByteArrayInputStream in = new ByteArrayInputStream(responseByte);
            ObjectInputStream is = new ObjectInputStream(in);
            votes = (List<Vote>) is.readObject();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return votes;
    }
}

The trace of the code 

05-02 09:58:50.248: W/System.err(934): java.lang.ClassNotFoundException: sun.security.provider.Sun
05-02 09:58:50.248: W/System.err(934):  at java.lang.Class.classForName(Native Method)
05-02 09:58:50.248: W/System.err(934):  at java.lang.Class.forName(Class.java:251)
05-02 09:58:50.248: W/System.err(934):  at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:2262)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1638)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:658)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1781)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1115)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1347)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1244)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1833)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1115)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1347)
05-02 09:58:50.268: W/System.err(934):  at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1244)
05-02 09:58:50.278: W/System.err(934):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1833)
05-02 09:58:50.278: W/System.err(934):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)
05-02 09:58:50.278: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)
05-02 09:58:50.278: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)
05-02 09:58:50.278: W/System.err(934):  at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1115)
05-02 09:58:50.288: W/System.err(934):  at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
05-02 09:58:50.288: W/System.err(934):  at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1347)
05-02 09:58:50.288: W/System.err(934):  at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1244)
05-02 09:58:50.298: W/System.err(934):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1833)
05-02 09:58:50.298: W/System.err(934):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)
05-02 09:58:50.298: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)
05-02 09:58:50.298: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)
05-02 09:58:50.298: W/System.err(934):  at java.util.ArrayList.readObject(ArrayList.java:661)
05-02 09:58:50.298: W/System.err(934):  at java.lang.reflect.Method.invokeNative(Native Method)
05-02 09:58:50.298: W/System.err(934):  at java.lang.reflect.Method.invoke(Method.java:515)
05-02 09:58:50.298: W/System.err(934):  at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1332)
05-02 09:58:50.298: W/System.err(934):  at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1244)
05-02 09:58:50.298: W/System.err(934):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1833)
05-02 09:58:50.308: W/System.err(934):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)
05-02 09:58:50.308: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)
05-02 09:58:50.318: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)
05-02 09:58:50.318: W/System.err(934):  at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1115)
05-02 09:58:50.318: W/System.err(934):  at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
05-02 09:58:50.318: W/System.err(934):  at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1347)
05-02 09:58:50.318: W/System.err(934):  at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1244)
05-02 09:58:50.328: W/System.err(934):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1833)
05-02 09:58:50.328: W/System.err(934):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)
05-02 09:58:50.348: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)
05-02 09:58:50.348: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)
05-02 09:58:50.348: W/System.err(934):  at java.util.ArrayList.readObject(ArrayList.java:661)
05-02 09:58:50.348: W/System.err(934):  at java.lang.reflect.Method.invokeNative(Native Method)
05-02 09:58:50.348: W/System.err(934):  at java.lang.reflect.Method.invoke(Method.java:515)
05-02 09:58:50.348: W/System.err(934):  at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1332)
05-02 09:58:50.348: W/System.err(934):  at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1244)
05-02 09:58:50.358: W/System.err(934):  at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1833)
05-02 09:58:50.358: W/System.err(934):  at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)
05-02 09:58:50.358: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)
05-02 09:58:50.358: W/System.err(934):  at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)
05-02 09:58:50.358: W/System.err(934):  at com.example.connection.GenerateNumberConnection.getVotes(GenerateNumberConnection.java:57)
05-02 09:58:50.358: W/System.err(934):  at com.example.elections.PagesValue.readWebServices(PagesValue.java:396)
05-02 09:58:50.358: W/System.err(934):  at com.example.elections.PagesValue$8.onClick(PagesValue.java:265)
05-02 09:58:50.358: W/System.err(934):  at android.view.View.performClick(View.java:4438)
05-02 09:58:50.358: W/System.err(934):  at android.view.View$PerformClick.run(View.java:18422)
05-02 09:58:50.358: W/System.err(934):  at android.os.Handler.handleCallback(Handler.java:733)
05-02 09:58:50.358: W/System.err(934):  at android.os.Handler.dispatchMessage(Handler.java:95)
05-02 09:58:50.358: W/System.err(934):  at android.os.Looper.loop(Looper.java:136)
05-02 09:58:50.358: W/System.err(934):  at android.app.ActivityThread.main(ActivityThread.java:5017)
05-02 09:58:50.358: W/System.err(934):  at java.lang.reflect.Method.invokeNative(Native Method)
05-02 09:58:50.358: W/System.err(934):  at java.lang.reflect.Method.invoke(Method.java:515)
05-02 09:58:50.358: W/System.err(934):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-02 09:58:50.358: W/System.err(934):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-02 09:58:50.368: W/System.err(934):  at dalvik.system.NativeStart.main(Native Method)
05-02 09:58:50.368: W/System.err(934): Caused by: java.lang.NoClassDefFoundError: sun/security/provider/Sun
05-02 09:58:50.368: W/System.err(934):  ... 73 more
05-02 09:58:50.368: W/System.err(934): Caused by: java.lang.ClassNotFoundException: Didn't find class "sun.security.provider.Sun" on path: DexPathList[[zip file "/data/app/com.example.elections-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.elections-1, /system/lib]]
05-02 09:58:50.388: W/System.err(934):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
05-02 09:58:50.388: W/System.err(934):  at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
05-02 09:58:50.388: W/System.err(934):  at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
05-02 09:58:50.388: W/System.err(934):  ... 73 more
05-02 09:58:50.758: D/AndroidRuntime(934): Shutting down VM
05-02 09:58:50.758: W/dalvikvm(934): threadid=1: thread exiting with uncaught exception (group=0xb1a39ba8)
05-02 09:58:50.808: E/AndroidRuntime(934): FATAL EXCEPTION: main
05-02 09:58:50.808: E/AndroidRuntime(934): Process: com.example.elections, PID: 934
05-02 09:58:50.808: E/AndroidRuntime(934): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.elections/com.example.elections.HomePage}: java.lang.NullPointerException
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.ActivityThread.access$800(ActivityThread.java:135)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.os.Handler.dispatchMessage(Handler.java:102)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.os.Looper.loop(Looper.java:136)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.ActivityThread.main(ActivityThread.java:5017)
05-02 09:58:50.808: E/AndroidRuntime(934):  at java.lang.reflect.Method.invokeNative(Native Method)
05-02 09:58:50.808: E/AndroidRuntime(934):  at java.lang.reflect.Method.invoke(Method.java:515)
05-02 09:58:50.808: E/AndroidRuntime(934):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-02 09:58:50.808: E/AndroidRuntime(934):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-02 09:58:50.808: E/AndroidRuntime(934):  at dalvik.system.NativeStart.main(Native Method)
05-02 09:58:50.808: E/AndroidRuntime(934): Caused by: java.lang.NullPointerException
05-02 09:58:50.808: E/AndroidRuntime(934):  at com.example.elections.HomePage.onCreate(HomePage.java:53)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.Activity.performCreate(Activity.java:5231)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-02 09:58:50.808: E/AndroidRuntime(934):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
05-02 09:58:50.808: E/AndroidRuntime(934):  ... 11 more
05-02 09:58:55.218: D/gralloc_goldfish(1074): Emulator without GPU emulation detected.
05-02 10:00:31.428: D/dalvikvm(1074): GC_FOR_ALLOC freed 139K, 6% free 3246K/3452K, paused 30ms, total 37ms

I spent a lot of time searching, but I didn't find anything.

Edit one:

The EncryptedInteger class here

有帮助吗？

解决方案

I'm guessing that the EncryptedInteger instance points to an instance of sun.security.provider.Sun. Since sun.security.provider.Sun is not in your Android application's classpath, it has no idea how to de-serialize it and blows up.

My bets are that it's the SecureRandom in EncryptedInteger.

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