mlem commented on issue #154: Don't serialize the whole valve into session, but use a smaller object. URL: https://github.com/apache/tomcat/pull/154#issuecomment-480842434 We are getting this message in our log all the time. I've found out, that our serialization library (Kryo) is serializing your valve into the session and is causing troubles with OpenJDK 11, because it wants to access a private field of the class loader ``` 28-Mar-2019 11:30:11.530 WARNING [msm-storage-thread-15] de.javakaffee.web.msm.BackupSessionTask.call FAILED for session id AF378F36B5D8310F0CF5B1800B89364B de.javakaffee.web.msm.TranscoderDeserializationException: com.esotericsoftware.kryo.KryoException: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.List java.lang.module.Configuration.parents accessible: module java.base does not "opens java.lang.module" to unnamed module @4eba42b8 Serialization trace: cf (java.lang.ModuleLayer) classLoaderValueMap (jdk.internal.loader.ClassLoaders$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (java.net.URLClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.catalina.loader.ParallelWebappClassLoader) classLoaderLoggers (org.apache.juli.ClassLoaderLogManager) manager (org.apache.juli.AsyncFileHandler) handlers (java.util.logging.Logger$ConfigurationData) config (java.util.logging.Logger) logger (org.apache.juli.logging.DirectJDKLog) containerLog (org.apache.catalina.valves.AccessLogValve) logs (org.apache.catalina.core.AccessLogAdapter) accessLog (org.apache.catalina.core.StandardHost) container (org.apache.catalina.valves.CrawlerSessionManagerValve) at de.javakaffee.web.msm.serializer.kryo.KryoTranscoder.serializeAttributes(KryoTranscoder.java:240) at de.javakaffee.web.msm.TranscoderService.serializeAttributes(TranscoderService.java:151) at de.javakaffee.web.msm.BackupSessionTask.serializeAttributes(BackupSessionTask.java:179) at de.javakaffee.web.msm.BackupSessionTask.call(BackupSessionTask.java:109) at de.javakaffee.web.msm.BackupSessionTask.call(BackupSessionTask.java:50) 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$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: com.esotericsoftware.kryo.KryoException: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.List java.lang.module.Configuration.parents accessible: module java.base does not "opens java.lang.module" to unnamed module @4eba42b8 Serialization trace: cf (java.lang.ModuleLayer) classLoaderValueMap (jdk.internal.loader.ClassLoaders$AppClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (java.net.URLClassLoader) classloader (java.security.ProtectionDomain) context (java.security.AccessControlContext) acc (org.apache.catalina.loader.ParallelWebappClassLoader) classLoaderLoggers (org.apache.juli.ClassLoaderLogManager) manager (org.apache.juli.AsyncFileHandler) handlers (java.util.logging.Logger$ConfigurationData) config (java.util.logging.Logger) logger (org.apache.juli.logging.DirectJDKLog) containerLog (org.apache.catalina.valves.AccessLogValve) logs (org.apache.catalina.core.AccessLogAdapter) accessLog (org.apache.catalina.core.StandardHost) container (org.apache.catalina.valves.CrawlerSessionManagerValve) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:101) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:100) at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:113) at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:39) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:361) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:302) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:629) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:86) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:361) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:302) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:629) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:86) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:106) at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:39) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:100) at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:629) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:86) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:361) at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:302) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:575) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:79) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:508) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:651) at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:113) at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:39) at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:557) at de.javakaffee.web.msm.serializer.kryo.KryoTranscoder.serializeAttributes(KryoTranscoder.java:237) ... 8 more Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.List java.lang.module.Configuration.parents accessible: module java.base does not "opens java.lang.module" to unnamed module @4eba42b8 at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340) at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280) at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:176) at java.base/java.lang.reflect.Field.setAccessible(Field.java:170) at com.esotericsoftware.kryo.serializers.FieldSerializer.buildValidFields(FieldSerializer.java:283) at com.esotericsoftware.kryo.serializers.FieldSerializer.rebuildCachedFields(FieldSerializer.java:216) at com.esotericsoftware.kryo.serializers.FieldSerializer.rebuildCachedFields(FieldSerializer.java:157) at com.esotericsoftware.kryo.serializers.FieldSerializer.<init>(FieldSerializer.java:150) at com.esotericsoftware.kryo.serializers.FieldSerializer.<init>(FieldSerializer.java:134) at com.esotericsoftware.kryo.serializers.FieldSerializer.<init>(FieldSerializer.java:130) at de.javakaffee.web.msm.serializer.kryo.DefaultFieldSerializerFactory.newDefaultSerializer(DefaultFieldSerializerFactory.java:34) at de.javakaffee.web.msm.serializer.kryo.KryoDefaultSerializerFactory$SerializerFactoryAdapter.makeSerializer(KryoDefaultSerializerFactory.java:45) at com.esotericsoftware.kryo.Kryo.newDefaultSerializer(Kryo.java:396) at com.esotericsoftware.kryo.Kryo.getDefaultSerializer(Kryo.java:380) at de.javakaffee.web.msm.serializer.kryo.KryoTranscoder$2.getDefaultSerializer(KryoTranscoder.java:168) at com.esotericsoftware.kryo.util.DefaultClassResolver.registerImplicit(DefaultClassResolver.java:74) at com.esotericsoftware.kryo.Kryo.getRegistration(Kryo.java:508) at com.esotericsoftware.kryo.Kryo.getSerializer(Kryo.java:528) at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:82) ... 83 more ```
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