[jira] [Created] (LOG4J2-2034) in async mode JsonLayout can't serialize an event with self referenced throwable

["Leonid Bogdanov (JIRA)" <ji...@apache.org>]

Leonid Bogdanov created LOG4J2-2034:
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             Summary: in async mode JsonLayout can't serialize an event with self referenced throwable
                 Key: LOG4J2-2034
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2034
             Project: Log4j 2
          Issue Type: Bug
          Components: Layouts
    Affects Versions: 2.9.0
            Reporter: Leonid Bogdanov


When async logging is configured, JsonLayout cannot serialize a log event in which provided Throwable has a self-reference. Fo example, this may by the case for many Spring exceptions inherited from {{org.springframework.core.NestedRuntimeException}} or {{org.springframework.core.NestedCheckedException}} classes via {{getMostSpecificCause()}} method.

The root cause of the bug is {{org.apache.logging.log4j.core.async.RingBufferLogEvent.getThrowable()}} method, it isn't marked as ignored by Jackson serializer, so when the Throwable contains a self-reference Jackson blows up with an exception
{code}
2017-09-07 13:28:08,799 Log4j2-TF-1-AsyncLogger[AsyncContext@6bc7c054]-1 ERROR com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Direct self-reference leading to cycle (through reference chain: org.apache.logging.log4j.core.async.RingBufferLogEvent["throwable"]->org.log4j.App$SelfReferencedException["mostSpecificCause"]) com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Direct self-reference leading to cycle (through reference chain: org.apache.logging.log4j.core.async.RingBufferLogEvent["throwable"]->org.log4j.App$SelfReferencedException["mostSpecificCause"])
	at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)
	at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1191)
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter._handleSelfReference(BeanPropertyWriter.java:944)
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:721)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719)
	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727)
	at com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter.serializeAsField(SimpleBeanPropertyFilter.java:208)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFieldsFiltered(BeanSerializerBase.java:771)
	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:153)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
	at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1396)
	at com.fasterxml.jackson.databind.ObjectWriter._configAndWriteValue(ObjectWriter.java:1120)
	at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:966)
	at org.apache.logging.log4j.core.layout.AbstractJacksonLayout.toSerializable(AbstractJacksonLayout.java:213)
	at org.apache.logging.log4j.core.layout.JsonLayout.toSerializable(JsonLayout.java:254)
	at org.apache.logging.log4j.core.layout.AbstractJacksonLayout.toSerializable(AbstractJacksonLayout.java:193)
	at org.apache.logging.log4j.core.layout.JsonLayout.toSerializable(JsonLayout.java:60)
	at org.apache.logging.log4j.core.layout.AbstractJacksonLayout.toSerializable(AbstractJacksonLayout.java:34)
	at org.apache.logging.log4j.core.layout.AbstractStringLayout.toByteArray(AbstractStringLayout.java:299)
	at org.apache.logging.log4j.core.layout.AbstractLayout.encode(AbstractLayout.java:210)
	at org.apache.logging.log4j.core.layout.AbstractLayout.encode(AbstractLayout.java:37)
...
{code}




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