[gradle] Android Studio: Where is the Compiler Error Output Window?

When I 'Run' my project in Android Studio, in the 'Messages' window, I get:

Gradle: 
FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':play01:compileDebug'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

It says > Compilation failed; see the compiler error output for details. So where is the "compiler error output"? And/Or how do I run with --stacktrace option?

Just click on the "Build" node in the Build Output

From some reason the "Compilation failed" node just started being automatically selected and for that the description window is very unhelpful.

It's really straightforward to set up! Just go to the Compiler settings at Android Studio 2.2.3 and set the --stacktrace command:

Then run the app again

Are you on Windows? Launch cmd, find your project folder and run "gradlew build". This should already give you more output than the IDE, you can also use --info, --stacktrace and --debug there.

You can also see the error in the Build window by clicking on the toggle button.

In my case i had a findViewById reference to a view i had deleted in xml

if you are running AS 3.1 and above:

1. go to Settings > Build, Execution and Deployment > compiler
2. add --stacktrace to the command line options, click apply and ok
3. At the bottom of AS click on Console/Build(If you use the stable version 3.1.2 and above) expand the panel and run your app again.

you should see the full stacktrace in the expanded view and the specific error.

Run

gradlew --stacktrace 

in a terminal to see the full report

for me it was

Task :app:compileDebugJavaWithJavac FAILED javacTask: source release 1.8 requires target release 1.8

so i added

 compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

in app.gradle file / android and the build completed successfully

In android studio 2.2.3 you can find output in the gradle console as shown below

I solved this error "Compilation failed to see the compiler error output for details"

The solution is very Simple: Add in a Gradle below a line of code

implementation 'com.google.android.gms:play-services-ads:15.0.0'

If you are in android studio 3.1, Verify if file->Project Structure -> Source compatibility is empty. it should not have 1.8 set.

then press ok, the project will sync and error will disappear.

For Android Studio v4.0

As others have mentioned, the "Messages" window that was evidently present in AS 3.* no longer exists in 4.0 (or else it's hidden very, very well). After wasting far too much time on this, I've found another way to view those compile errors:

1. Open your Gradle tool window. By default, it's on the right edge toward the top:

If you don't see it there, use View > Tool Windows > Gradle.

2. In the Gradle window, open your app's root option and run Tasks > build > build:

3. The Run tool window should open automatically, where you'll see details about the cause of the build error:

If it doesn't open automatically, you can access it through View > Tool Windows > Run.

Hopefully that gives you all the info you need. If not though, try:

4. Go to File > Settings > Build, Execution, Deployment > Compiler. In the Command-line Options, add --scan.

Apply and OK, then try the Gradle build over again.

after the convert android to androidx.

change Import library problem will sol. Like this:

import androidx.appcompat.widget.Toolbar;  <<  like this

import androidx.annotation.NonNull; << like this

import androidx.appcompat.app.ActionBarDrawerToggle; << like this

import androidx.drawerlayout.widget.DrawerLayout; << like this

import androidx.recyclerview.widget.RecyclerView; << like this

import androidx.appcompat.app.AppCompatActivity; << like this

For Android Studio 3.1, select the icon below the Build one in the Build window.

By Android Studio 3.3 (possibly in 3.2.1), the icon has changed, though the location is the same:

The build window should open when you run a build action (e.g. from the Build menu). If you don't see it, you can try the "Build" button along the bottom of the window (also visible in the above screenshots), or through the menus View ? Tool Windows ? Build.

I am building on what Jorge recommended. Goto File->Settings->compiler.

Here you will see a field to add compiler options where you plug in --stacktrace

In my case I prefer to open the Terminal window on the bottom left, and run gradlew build --info :