Error trying to run sample about litho

[rspencer01]

I tested the sample on a virgin Ubuntu installation, building buck from master when writing the tutorial.

The plugins does need to be changed, now I think about it, as it is just yet another buck target. So first prize would be annotations_processor. However, we must keep the plugins on the widget dep for internal purposes. This won't affect most people, I'd think, because we'd ship a binary with compiled widgets. For building the sample app, we just replace the first file you mentioned and tell them to do the brew install you detail above.

[caabernathy]

Seems the current Buck release is too old and doesn't contain the "plugins" support. I'll test if this works by building Buck off master.

[caabernathy]

Update, I edited 3 files:

sample/src/main/java/com/facebook/samples/litho/BUCK
src/main/java/com/facebook/components/fresco/BUCK
src/main/java/com/facebook/components/widget/BUCK

Replacing plugins with annotation_processor per recommendation. The next error, which may be unrelated is this:

$ buck install -r sample
No Android platform target specified. Using default: Google Inc.:Google APIs:23
BUILD FAILED: //src/main/java/com/facebook/components/widget:widget failed on step javac with an exception:
//src/main/java/com/facebook/components/widget:widget: javac unable to load annotation processor: //src/main/java/com/facebook/components/processor:processor
com.facebook.buck.util.HumanReadableException: //src/main/java/com/facebook/components/widget:widget: javac unable to load annotation processor: //src/main/java/com/facebook/components/processor:processor
	at com.facebook.buck.jvm.java.Jsr199Javac.prepareProcessors(Jsr199Javac.java:368)
	at com.facebook.buck.jvm.java.Jsr199Javac.buildWithClasspath(Jsr199Javac.java:230)
	at com.facebook.buck.jvm.java.Jsr199Javac.buildWithClasspath(Jsr199Javac.java:148)
	at com.facebook.buck.jvm.java.JavacStep.tryBuildWithFirstOrderDeps(JavacStep.java:156)
	at com.facebook.buck.jvm.java.JavacStep.execute(JavacStep.java:139)
	at com.facebook.buck.step.DefaultStepRunner.runStepForBuildTarget(DefaultStepRunner.java:54)
	at com.facebook.buck.rules.CachingBuildEngine.executeCommandsNowThatDepsAreBuilt(CachingBuildEngine.java:1351)
	at com.facebook.buck.rules.CachingBuildEngine.lambda$null$0(CachingBuildEngine.java:340)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submitWithSemaphore$0(WeightedListeningExecutorService.java:77)
	at com.google.common.util.concurrent.Futures$AsyncChainingFuture.doTransform(Futures.java:1442)
	at com.google.common.util.concurrent.Futures$AsyncChainingFuture.doTransform(Futures.java:1433)
	at com.google.common.util.concurrent.Futures$AbstractChainingFuture.run(Futures.java:1408)
	at com.google.common.util.concurrent.Futures$2$1.run(Futures.java:1177)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

[-] PROCESSING BUCK FILES...FINISHED 0.6s [100%]
[-] DOWNLOADING... (0.00 B/S AVG, TOTAL: 0.00 B, 0 Artifacts)
[-] BUILDING...FINISHED 1.0s [100%] (127/135 JOBS, 2 UPDATED, 2 [1.5%] CACHE MISS)

[caabernathy]

FYI, if I install the latest version of Buck

brew update
brew tap facebook/fb
brew install --HEAD buck

I can build and run the sample with no BUCK file changes to switch from plugins.

[pavlospt]

Can be closed as irrelevant!