Benjamin Glatzeder created LANG-1719:
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Summary: RandomStringUtils.random outputs strings that are equal
over and over
Key: LANG-1719
URL: https://issues.apache.org/jira/browse/LANG-1719
Project: Commons Lang
Issue Type: Bug
Components: lang.*
Affects Versions: 3.13.0
Environment: Samsung Smartphone
Product name: Galaxy A53 5G
Model name: SM-A536B/DS
Software info:
One UI version 5.1
Android version 13
Reporter: Benjamin Glatzeder
Fix For: 3.12.0
The following line of code outputs equal strings over and over:
{code:java}
RandomStringUtils.random(12,"abcdefghijklmnopqrstuvwxyz0123456789") {code}
Steps to reproduce:
1) Create a new Android project in Android Studio
2) Add the following dependency to your gradle file
{code:bash}
implementation("org.apache.commons:commons-lang3:3.13.0") {code}
3) Use the following code in your MainActivity:
{code:java}
package test.randomstringutils
import android.os.Bundle
import android.util.Log
import androidx.activity.ComponentActivity
import org.apache.commons.lang3.RandomStringUtils
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState : Bundle?) {
super.onCreate(savedInstanceState)
val randomString =
RandomStringUtils.random(12,"abcdefghijklmnopqrstuvwxyz0123456789")
Log.d(TAG, randomString)
}
companion object {
private const val TAG = "TAG"
}
}
{code}
4) Run project and note the string in Logcat
5) Run project again and compare the new random string in Logcat
One will note that the strings are equal. The expected result should be that
the strings are not equal. Here's an example output:
{code:java}
09:33:10.154 TAG tes...tringutils D m9mcx5ywuxdc
09:33:28.561 TAG tes...tringutils D m9mcx5ywuxdc
{code}
Using the previous commons-lang3 version in the project resolves the issue.
Here are the steps to reproduce:
1) Replace
{code:bash}
implementation("org.apache.commons:commons-lang3:3.13.0") {code}
with
{code:bash}
implementation("org.apache.commons:commons-lang3:3.12.0") {code}
2) Click on "Sync now"
3) Run project and note the string in Logcat
4) Run project again and compare the new random string in Logcat
One will note that the strings are not equal. This is the expected result.
Here's an example output:
{code:java}
09:40:50.268 TAG tes...tringutils D 1tjkvkta6ibi
09:40:55.324 TAG tes...tringutils D 02nfvrf9pfgl{code}
I was able to consistently reproduce this issue using a Samsung Galaxy A53 5G
smartphone as well as on an Android Virtual Device (AVD). To the best of my
knowledge the smartphone runs on an ARM processor and the AVD has an emulated
ARM processor.
I was *not* able to reproduce this issue when I created a Kotlin project in
IntelliJ with similar lines of code which was running on my Windows machine
with an x64 processor.
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