Didn't find class “java.beans.Introspector” when Using OpenCSV to parse csv files

Question

i am working on parsing .csv files using OpenCsv for my android application . I writing code in kotlin . Here is my code :

This is how i parse the csv file:

val beans: List<csvDataClass> = CsvToBeanBuilder<csvDataClass>(FileReader(file))
            .withType(csvDataClass::class.java).build().parse()

    for (i:Int in 0..beans.size-1) {
        Log.d("Tag", " NAME = ${beans.get(i).name} Number = ${beans.get(i).phone_one_value}")
    }

This is the object class to which i want to convert the csv data.

class csvDataClass {
@CsvBindByName (column = "Name")
var name:String = ""
@CsvBindByName (column = "Phone 1 - Value")
var phone_one_value:Int = 0

constructor() {}
constructor(name: String, phone_one_value: Int) {
    this.name = name
    this.phone_one_value = phone_one_value
}

}

I have added this line in build.gradle file:

implementation 'com.opencsv:opencsv:4.1'

Here is my csv file content:

Name,Phone 1 - Value

GT,11111 11111 HK,22222 22222 KK,33333 33333 PK,44444 44444

But when i run the code i am getting :

05-04 16:13:31.821 25829-25829/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.pk.opencsvpoc, PID: 25829
java.lang.NoClassDefFoundError: Failed resolution of: Ljava/beans/Introspector;
    at com.opencsv.bean.HeaderColumnNameMappingStrategy.loadDescriptors(HeaderColumnNameMappingStrategy.java:372)
    at com.opencsv.bean.HeaderColumnNameMappingStrategy.loadDescriptorMap(HeaderColumnNameMappingStrategy.java:284)
    at com.opencsv.bean.HeaderColumnNameMappingStrategy.setType(HeaderColumnNameMappingStrategy.java:415)
    at com.opencsv.bean.opencsvUtils.determineMappingStrategy(opencsvUtils.java:83)
    at com.opencsv.bean.CsvToBeanBuilder.build(CsvToBeanBuilder.java:156)
    at com.example.pardeepkumar.opencsvpoc.MainActivity.readCsvFile(MainActivity.kt:46)
    at com.example.pardeepkumar.opencsvpoc.MainActivity.onCreate(MainActivity.kt:38)
    at android.app.Activity.performCreate(Activity.java:6726)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)
    at android.app.ActivityThread.-wrap12(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6121)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "java.beans.Introspector" on path: DexPathList[[zip file "/data/app/com.example.pk.opencsvpoc-1/base.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.pk.opencsvpoc-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.example.pk.opencsvpoc-1/lib/arm64, /system/lib64, /vendor/lib64]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at com.opencsv.bean.HeaderColumnNameMappingStrategy.loadDescriptors(HeaderColumnNameMappingStrategy.java:372) 
    at com.opencsv.bean.HeaderColumnNameMappingStrategy.loadDescriptorMap(HeaderColumnNameMappingStrategy.java:284) 
    at com.opencsv.bean.HeaderColumnNameMappingStrategy.setType(HeaderColumnNameMappingStrategy.java:415) 
    at com.opencsv.bean.opencsvUtils.determineMappingStrategy(opencsvUtils.java:83) 
    at com.opencsv.bean.CsvToBeanBuilder.build(CsvToBeanBuilder.java:156) 
    at com.example.pardeepkumar.opencsvpoc.MainActivity.readCsvFile(MainActivity.kt:46) 
    at com.example.pardeepkumar.opencsvpoc.MainActivity.onCreate(MainActivity.kt:38) 
    at android.app.Activity.performCreate(Activity.java:6726) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727) 
    at android.app.ActivityThread.-wrap12(ActivityThread.java) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:154) 
    at android.app.ActivityThread.main(ActivityThread.java:6121) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779) 

Answer 1

Bean processing on Android requires an external library: openbeans .

Yet, I'm not sure if OpenCSV will work if you add this library to your classpath as the packages names of classes such as Introspector in OpenBeans won't match with the original JDK package.

You can also try my library: univocity-parsers , which can be used on Android with OpenBeans to generate instances of your classes.

Use it like this:

CsvRoutines routines = new CsvRoutines();

for (csvDataClass bean : routines.iterate(csvDataClass.class, file)) {
        System.out.println(bean);
}

Hope this helps.