Caused by: java.lang.NullPointerException
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClass.<init>(SerializableClass.java:80)
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClassRegistry$1.computeValue(SerializableClassRegistry.java:67)
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClassRegistry$1.computeValue(SerializableClassRegistry.java:57)
<------>at java.base/java.lang.ClassValue.getFromHashMap(ClassValue.java:226)
<------>at java.base/java.lang.ClassValue.getFromBackup(ClassValue.java:208)
<------>at java.base/java.lang.ClassValue.get(ClassValue.java:114)
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClassRegistry.lookup(SerializableClassRegistry.java:82)
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClass.<init>(SerializableClass.java:76)
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClassRegistry$1.computeValue(SerializableClassRegistry.java:67)
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClassRegistry$1.computeValue(SerializableClassRegistry.java:57)
<------>at java.base/java.lang.ClassValue.getFromHashMap(ClassValue.java:226)
<------>at java.base/java.lang.ClassValue.getFromBackup(ClassValue.java:208)
<------>at java.base/java.lang.ClassValue.get(ClassValue.java:114)
<------>at org.jboss.marshalling//org.jboss.marshalling.reflect.SerializableClassRegistry.lookup(SerializableClassRegistry.java:82)
<------>at org.jboss.marshalling.river//org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:177)
<------>at org.jboss.marshalling.river//org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1131)
<------>at org.jboss.marshalling.river//org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:1087)
<------>at org.jboss.marshalling.river//org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:953)
<------>at org.jboss.marshalling//org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58)
<------>at org.jboss.marshalling//org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111)
<------>at org.wildfly.clustering.marshalling.spi//org.wildfly.clustering.marshalling.spi.util.CollectionExternalizer.writeCollection(CollectionExternalizer.java:66)
...