Caumons Caumons - 3 months ago 78
Apache Configuration Question

Method not found using DigestUtils in Android

I am trying to use the library DigestUtils in Android 2.3.1 using JDK 1.6, however I get the following error when executing the app:

Could not find method org.apache.commons.codec.binary.Hex.encodeHexString, referenced from method org.apache.commons.codec.digest.DigestUtils.shaHex


Here you have the stacktrace:

02-03 10:25:45.153: I/dalvikvm(1230): Could not find method org.apache.commons.codec.binary.Hex.encodeHexString, referenced from method org.apache.commons.codec.digest.DigestUtils.shaHex
02-03 10:25:45.153: W/dalvikvm(1230): VFY: unable to resolve static method 329: Lorg/apache/commons/codec/binary/Hex;.encodeHexString ([B)Ljava/lang/String;
02-03 10:25:45.153: D/dalvikvm(1230): VFY: replacing opcode 0x71 at 0x0004
02-03 10:25:45.153: D/dalvikvm(1230): VFY: dead code 0x0007-0008 in Lorg/apache/commons/codec/digest/DigestUtils;.shaHex ([B)Ljava/lang/String;
02-03 10:25:45.163: D/AndroidRuntime(1230): Shutting down VM
02-03 10:25:45.163: W/dalvikvm(1230): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-03 10:25:45.173: E/AndroidRuntime(1230): FATAL EXCEPTION: main
02-03 10:25:45.173: E/AndroidRuntime(1230): java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Hex.encodeHexString
02-03 10:25:45.173: E/AndroidRuntime(1230): at org.apache.commons.codec.digest.DigestUtils.md5Hex(DigestUtils.java:226)
02-03 10:25:45.173: E/AndroidRuntime(1230): at com.caumons.trainingdininghall.ConnectionProfileActivity.onCreate(ConnectionProfileActivity.java:20)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.os.Handler.dispatchMessage(Handler.java:99)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.os.Looper.loop(Looper.java:123)
02-03 10:25:45.173: E/AndroidRuntime(1230): at android.app.ActivityThread.main(ActivityThread.java:3647)
02-03 10:25:45.173: E/AndroidRuntime(1230): at java.lang.reflect.Method.invokeNative(Native Method)
02-03 10:25:45.173: E/AndroidRuntime(1230): at java.lang.reflect.Method.invoke(Method.java:507)
02-03 10:25:45.173: E/AndroidRuntime(1230): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-03 10:25:45.173: E/AndroidRuntime(1230): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-03 10:25:45.173: E/AndroidRuntime(1230): at dalvik.system.NativeStart.main(Native Method)


The line of code which causes the exception is:

String hash = DigestUtils.shaHex("textToHash");


I have executed the same code in a Java class outside Android and it works! So, I do not know why when working with Android it does not work... I put the libraty inside a new libs/ folder in my app and updated the BuildPath to use it. If I try to use md5 instead of sha1 I get the same exception. Any help would be appreciated! Thank you.

UPDATE:

As this is a very active question, I've changed the accepted answer in favour of @DA25, as his solution is straightforward and the high number of upvotes prove that it works.

Answer

I ran into the same issue trying to use DigestUtils in my Android app. This was the best answer I could find by searching, but I was reluctant to rebuild the .jar file with the namespace changed. After spending some time on this issue, I found an easier way to solve the problem for my case. The problem statement for my code was

String s = DigestUtils.md5Hex(data);

Replace this statement with the following and it will work:

String s = new String(Hex.encodeHex(DigestUtils.md5(data)));

Similarly, for shaHex exampl, you can change it to

String hash = new String(Hex.encodeHex(DigestUtils.sha("textToHash")));

This works because even though Android does not have encodeHexString(), it does have encodeHex(). Hope this would help others who run into the same issue.

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