I could find:
WARN sonia.scm.api.FallbackExceptionMapper - mapping unexpected com.aragost.javahg.internals.RuntimeIOException to status code 500
com.aragost.javahg.internals.RuntimeIOException: Input length = 1
But this is "just" the error for the Webinterface. The Error in the log for the Hg Push I found:15:01:49.833 [HgHookWorker-1] ERROR sonia.scm.repository.spi.HgHookChangesetProvider - could not retrieve changesets
com.aragost.javahg.internals.RuntimeIOException: Input length = 1
at com.aragost.javahg.internals.Utils.asRuntime(Utils.java:437)
at com.aragost.javahg.internals.Utils.decodeBytes(Utils.java:243)
at com.aragost.javahg.internals.Utils.decodeBytes(Utils.java:223)
at com.aragost.javahg.internals.HgInputStream.textUpTo(HgInputStream.java:430)
at sonia.scm.repository.spi.javahg.AbstractChangesetCommand.createFromInputStream(AbstractChangesetCommand.java:240)
at sonia.scm.repository.spi.javahg.AbstractChangesetCommand.readListFromStream(AbstractChangesetCommand.java:164)
at sonia.scm.repository.spi.javahg.HgLogChangesetCommand.execute(HgLogChangesetCommand.java:65)
at sonia.scm.repository.spi.HgHookChangesetProvider.handleRequest(HgHookChangesetProvider.java:70)
at sonia.scm.repository.api.HgHookBranchProvider.changesets(HgHookBranchProvider.java:115)
at sonia.scm.repository.api.HgHookBranchProvider.collect(HgHookBranchProvider.java:125)
at sonia.scm.repository.api.HgHookBranchProvider.getDeletedOrClosed(HgHookBranchProvider.java:89)
at sonia.scm.repository.DefaultBranchDeleteProtection.protectDefaultBranch(DefaultBranchDeleteProtection.java:57)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.github.legman.InvocationContext.invoke(InvocationContext.java:108)
at com.github.legman.InvocationContext.proceed(InvocationContext.java:101)
at com.github.legman.micrometer.MicrometerInvocationInterceptor.invoke(MicrometerInvocationInterceptor.java:47)
at com.github.legman.InvocationContext.proceed(InvocationContext.java:99)
at com.github.legman.EventHandler.handleEvent(EventHandler.java:103)
at com.github.legman.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:52)
at com.github.legman.EventBus.dispatchSynchronous(EventBus.java:452)
at com.github.legman.EventBus.dispatch(EventBus.java:446)
at com.github.legman.EventBus.dispatchSynchronousQueuedEvents(EventBus.java:421)
at
com.github.legman.EventBus.post(EventBus.java:333)
at
sonia.scm.event.LegmanScmEventBus.post(LegmanScmEventBus.java:92)
at sonia.scm.repository.AbstractRepositoryManager.fireHookEvent(AbstractRepositoryManager.java:57)
at sonia.scm.repository.spi.HookEventFacade$HookEventHandler.fireHookEvent(HookEventFacade.java:137)
at sonia.scm.repository.hooks.DefaultHookHandler.fireHook(DefaultHookHandler.java:119)
at sonia.scm.repository.hooks.DefaultHookHandler.handleHookRequest(DefaultHookHandler.java:105)
at sonia.scm.repository.hooks.DefaultHookHandler.handleHookRequest(DefaultHookHandler.java:90)
at sonia.scm.repository.hooks.DefaultHookHandler.run(DefaultHookHandler.java:77)
at sonia.scm.repository.hooks.HookServer.lambda$associateSecurityManager$1(HookServer.java:103)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.nio.charset.MalformedInputException: Input length = 1
at java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
at java.base/java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:813)
at com.aragost.javahg.internals.Utils.decodeBytes(Utils.java:241)
... 37 common frames omitted
15:01:49.846 [HgHookWorker-1] INFO com.aragost.javahg.internals.Server - Command server stopped: /var/lib/scm/repositories/3NSoY2vemIF/data
15:01:49.846 [HgHookWorker-1] WARN sonia.scm.repository.hooks.DefaultHookHandler - unknown error on hook occurred