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IllegalAccessError with Android and BouncyCastle

I am trying to implement a timestamp request as seen here: http://bouncy-castle.1462172.n4.nabble.com/Timestamp-request-and-response-td1558231.html In j2se it works fine, but on android I get an IllegalAccessError. Logcat output :

FATAL EXCEPTION: main

java.lang.IllegalAccessError: tried to access method org.bouncycastle.asn1.DERBoolean.<init>:(Z)V from class org.bouncycastle.tsp.TimeStampRequestGenerator
at org.bouncycastle.tsp.TimeStampRequestGenerator.setCertReq(Unknown Source)
at org.ats.ats.onCreate(ats.java:30)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)

W/ActivityManager(   59):   Force finishing activity org.ats/.ats

It is necessary for me to ask for the Certificate in the TSResponse. Android api is 2.2 My code:

        TimeStampRequestGenerator reqgen = new TimeStampRequestGenerator();
        reqgen.setCertReq(true);

        MessageDig开发者_如何学JAVAest messageDigest = MessageDigest.getInstance("SHA-1");
        messageDigest.update("messageImprint".getBytes());
        byte[] digest = messageDigest.digest();
        String ocspUrl = "http://egtstamp.egroup.hu:80/tsa";
        OutputStream out = null;

        TimeStampRequest req = reqgen.generate(TSPAlgorithms.SHA1, digest); 
        byte request[] = req.getEncoded(); 

        URL url = new URL(ocspUrl); 
        HttpURLConnection con = (HttpURLConnection) url.openConnection(); 

        con.setDoOutput(true); 
        con.setDoInput(true); 
        con.setRequestMethod("POST"); 
        con.setRequestProperty("Content-type", "application/timestamp-query"); 

        con.setRequestProperty("Content-length", String.valueOf(request.length)); 
        out = con.getOutputStream(); 
        out.write(request); 
        out.flush(); 
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