While trying to install a custom exception handler to catch uncaught exceptions (crashes), I ended up writing
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| CustomExceptionHandler handler = new CustomExceptionHandler(Thread.currentThread().getUncaughtExceptionHandler());
Thread.setDefaultUncaughtExceptionHandler(handler);
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instead of
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| Thread.UncaughtExceptionHandler existingHandler = Thread.getDefaultUncaughtExceptionHandler();
CustomExceptionHandler handler = new CustomExceptionHandler(existingHandler);
Thread.setDefaultUncaughtExceptionHandler(handler);
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The difference looks minor but it broke the exception handler and converted every crash into a cryptic ANR!
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| 0 libc.so syscall
1 libart.so art::ConditionVariable::WaitHoldingLocks(art::Thread*)
2 libart.so art::ThreadList::WaitForOtherNonDaemonThreadsToExit(bool)
3 libart.so art::JII::DestroyJavaVM(_JavaVM*)
4 libandroid_runtime.so android::AndroidRuntime::start(char const*, android::Vector const&, bool)
5 app_process64 main
6 libc.so __libc_init
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Very occasionally, I got a more useful error that didn’t look related but it was.
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| java.lang.StackOverflowError:
at net.ashishb.androidmusicplayer.util.CustomExceptionHandler.uncaughtException (CustomExceptionHandler.java:20)
at java.lang.ThreadGroup.uncaughtException (ThreadGroup.java:1068)
at java.lang.ThreadGroup.uncaughtException (ThreadGroup.java:1063)
at net.ashishb.androidmusicplayer.util.CustomExceptionHandler.uncaughtException (CustomExceptionHandler.java:22)
at org.chromium.base.JavaExceptionReporter.uncaughtException (chromium-Monochrome.aab-stable-484407323:6)
at java.lang.ThreadGroup.uncaughtException (ThreadGroup.java:1068)
at java.lang.ThreadGroup.uncaughtException (ThreadGroup.java:1063)
at net.ashishb.androidmusicplayer.util.CustomExceptionHandler.uncaughtException (CustomExceptionHandler.java:22)
at org.chromium.base.JavaExceptionReporter.uncaughtException (chromium-Monochrome.aab-stable-484407323:6)
at java.lang.ThreadGroup.uncaughtException (ThreadGroup.java:1068)
at java.lang.ThreadGroup.uncaughtException (ThreadGroup.java:1063)
at net.ashishb.androidmusicplayer.util.CustomExceptionHandler.uncaughtException (CustomExceptionHandler.java:22)
at org.chromium.base.JavaExceptionReporter.uncaughtException (chromium-Monochrome.aab-stable-484407323:6)
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