Bdtjtk

I am using Butterknife to simplify my code.
I have a TextView in the activity_main.xml file.
I want to display a toast by clicking on this TextView
But when I use @OnClick annotation from Butterknife library my app crashes

MainActivity.java

@Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ButterKnife.bind(this);

    }



    @OnClick(R.id.clickme) void clicked() {

        Toast.makeText(MainActivity.this, "Clicked", Toast.LENGTH_SHORT).show();

    }

activity_main.xml

<TextView

        android:id="@+id/clickme"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="click me"/>

Normally it should display a toast but the app crashes with the following stack trace.

2019-01-02 15:26:42.617 3909-3909/com.realestate.app.realestate E/AndroidRuntime: FATAL EXCEPTION: main

**Process: com.realestate.app.realestate, PID: 3909

java.lang.BootstrapMethodError: Exception from call site #1 bootstrap method

    at butterknife.internal.DebouncingOnClickListener.<clinit>(DebouncingOnClickListener.java:12)

    at com.realestate.app.realestate.realestate.MainActivity_ViewBinding.<init>(MainActivity_ViewBinding.java:34)**

    at java.lang.reflect.Constructor.newInstance0(Native Method)

    at java.lang.reflect.Constructor.newInstance(Constructor.java:343)

    at butterknife.ButterKnife.bind(ButterKnife.java:171)

    at butterknife.ButterKnife.bind(ButterKnife.java:100)

    at com.realestate.app.realestate.realestate.MainActivity.onCreate(MainActivity.java:25)

    at android.app.Activity.performCreate(Activity.java:7136)

    at android.app.Activity.performCreate(Activity.java:7127)

    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)

    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2894)

    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3049)

    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)

    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)

    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1809)

    at android.os.Handler.dispatchMessage(Handler.java:106)

    at android.os.Looper.loop(Looper.java:193)

    at android.app.ActivityThread.main(ActivityThread.java:6680)

    at java.lang.reflect.Method.invoke(Native Method)

    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

 Caused by: java.lang.ClassCastException: Bootstrap method returned null

    at butterknife.internal.DebouncingOnClickListener.<clinit>(DebouncingOnClickListener.java:12) 

    **at com.realestate.app.realestate.realestate.MainActivity_ViewBinding.<init>(MainActivity_ViewBinding.java:34)** 

    at java.lang.reflect.Constructor.newInstance0(Native Method) 

    at java.lang.reflect.Constructor.newInstance(Constructor.java:343) 

    at butterknife.ButterKnife.bind(ButterKnife.java:171) 

    at butterknife.ButterKnife.bind(ButterKnife.java:100) 

    at com.realestate.app.realestate.realestate.MainActivity.onCreate(MainActivity.java:25) 

    at android.app.Activity.performCreate(Activity.java:7136) 

    at android.app.Activity.performCreate(Activity.java:7127) 

    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271) 

    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2894) 

    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3049) 

    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 

    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 

    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1809) 

    at android.os.Handler.dispatchMessage(Handler.java:106) 

    at android.os.Looper.loop(Looper.java:193) 

    at android.app.ActivityThread.main(ActivityThread.java:6680) 

    at java.lang.reflect.Method.invoke(Native Method) 

    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

My gradle dependency for Butterknife

implementation 'com.jakewharton:butterknife:9.0.0-rc3'

annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-rc3'

I solved it by downgrading the library version.

I replaced the following

implementation 'com.jakewharton:butterknife:9.0.0-rc3'

annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-rc3'

with

implementation 'com.jakewharton:butterknife:9.0.0-rc1'

annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-rc1'

Maybe there is some other dependency in your build.gradle that transitively pulls in a different version of ButterKnife. Check your dependency tree with gradlew dependencies, and look for different versions of ButterKnife.

If you find that e.g. the com.example:foo dependency pulls in a ButterKnife version different from yours, you can exclude the other ButterKnife version by adding an exclude rule to the foo library:

implementation('com.example:foo:1.2.3') {

    exclude group: 'com.jakewharton', module: 'butterknife'

}

Hopefully this will solve the runtime exception.