exceeds the maximum length

[gianluca-valentini]

Hi,
i'm using v4.10 version of jackson dataformat velocypack.
In ArangoDB i need sometimes to save some text and i have the follow error:

com.fasterxml.jackson.databind.JsonMappingException: String length (20049662) exceeds the maximum length (20000000).

How I can solve it? I know that jackson can increase the maximum length of textual values by using the setMaxTextLength method of the StreamReadConstraints class but I don't have access to it (or ObjectMapper mapper = new ObjectMapper();
mapper.reader().with(StreamReadConstraints.builder().setMaxTextLength(30000000).build())).

Is there something that I can use or set ot increase that value?
Thanks
Gianluca Valentini

[rashtao]

Where is this exception thrown? Can you please report the exception stack trace and a code snippet to reproduce it?

[gianluca-valentini]

Hi @rashtao
Here the complete trace.

com.arangodb.ArangoDBException: com.fasterxml.jackson.databind.JsonMappingException: String length (20049662) exceeds the maximum length (20000000) (through reference chain: com.arangodb.entity.BaseDocument["details"])
	at com.arangodb.internal.serde.InternalSerdeImpl.deserialize(InternalSerdeImpl.java:168) ~[core-7.1.0.jar:7.1.0]
	at com.arangodb.internal.serde.InternalSerdeImpl.deserialize(InternalSerdeImpl.java:60) ~[core-7.1.0.jar:7.1.0]
	at com.arangodb.internal.serde.InternalSerdeImpl.deserializeUserData(InternalSerdeImpl.java:125) ~[core-7.1.0.jar:7.1.0]
	at com.arangodb.internal.InternalArangoCollection.lambda$getDocumentResponseDeserializer$1(InternalArangoCollection.java:174) ~[core-7.1.0.jar:7.1.0]
	at com.arangodb.internal.ArangoExecutorSync.execute(ArangoExecutorSync.java:62) ~[core-7.1.0.jar:7.1.0]
	at com.arangodb.internal.ArangoExecutorSync.execute(ArangoExecutorSync.java:52) ~[core-7.1.0.jar:7.1.0]
	at com.arangodb.internal.ArangoCollectionImpl.getDocument(ArangoCollectionImpl.java:134) ~[core-7.1.0.jar:7.1.0]
	at com.arangodb.internal.ArangoCollectionImpl.getDocument(ArangoCollectionImpl.java:127) ~[core-7.1.0.jar:7.1.0]
	at tech.sharelock.arango.client.dao.GenericDAO.saveVertex(GenericDAO.java:298) ~[client-arango-6.1.0-SNAPSHOT.jar:?]
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1736) [?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
	at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: com.fasterxml.jackson.databind.JsonMappingException: String length (20049662) exceeds the maximum length (20000000) (through reference chain: com.arangodb.entity.BaseDocument["details"])
	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:402) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:361) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.wrapAndThrow(BeanDeserializerBase.java:1853) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1683) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:320) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:177) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:323) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:2105) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1583) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.arangodb.internal.serde.InternalSerdeImpl.deserialize(InternalSerdeImpl.java:166) ~[core-7.1.0.jar:7.1.0]
	... 15 more
Caused by: com.fasterxml.jackson.core.exc.StreamConstraintsException: String length (20049662) exceeds the maximum length (20000000)
	at com.fasterxml.jackson.core.StreamReadConstraints.validateStringLength(StreamReadConstraints.java:295) ~[jackson-core-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.core.util.ReadConstrainedTextBuffer.validateStringLength(ReadConstrainedTextBuffer.java:27) ~[jackson-core-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.core.util.TextBuffer.finishCurrentSegment(TextBuffer.java:939) ~[jackson-core-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishString2(UTF8StreamJsonParser.java:2584) ~[jackson-core-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishAndReturnString(UTF8StreamJsonParser.java:2560) ~[jackson-core-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.getText(UTF8StreamJsonParser.java:335) ~[jackson-core-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializerNR._deserializeNR(UntypedObjectDeserializerNR.java:246) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializerNR.deserialize(UntypedObjectDeserializerNR.java:70) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.SettableAnyProperty.deserialize(SettableAnyProperty.java:198) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.SettableAnyProperty.deserializeAndSet(SettableAnyProperty.java:179) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1681) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:320) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:177) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:323) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:2105) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1583) ~[jackson-databind-2.15.1.jar:2.15.1]
	at com.arangodb.internal.serde.InternalSerdeImpl.deserialize(InternalSerdeImpl.java:166) ~[core-7.1.0.jar:7.1.0]
	... 15 more

Consider that tech.sharelock.arango.client.dao.GenericDAO.saveVertex(GenericDAO.java:298) is my code where I save a Document that contains in 'details' attribute. The field 'details' contains a string text very large text.

That code is below

297: DocumentCreateEntity<Void> created = collection.insertDocument(document);
298: document = collection.getDocument(created.getKey(), BaseDocument.class);

Thanks
Gianluca

[rashtao]

Thanks for clarifying, this exception is not related to jackson-dataformat-velocypack, but coming from Jackson com.fasterxml.jackson.databind.ObjectReader, which is used in the ArangoDB Java driver InternalSerdeImpl to deserialize JSON content type.

While this will be fixed in a future version of the driver, you can in the meantime work around it with either:

1. using VPACK content type, i.e. configure the driver with .protocol(Protocol.HTTP2_VPACK)
2. globally change Jackson max String length, by adding this code before instantiating the driver:

StreamReadConstraints.overrideDefaultStreamReadConstraints(
        StreamReadConstraints
                        .builder()
                        .maxStringLength(Integer.MAX_VALUE) // your limit here
                        .build()
);

Note that (2) is potentially unsafe, because it will affect all Jackson instances in your application, i.e. also used for decoding web requests.

[rashtao]

arangodb/arangodb-java-driver#537

[gianluca-valentini]

Hi @rashtao
this is my code hat I use to create ArangoDB

ArangoDB arangoDB = new ArangoDB.Builder().host(host, port).user(_DB_USERID).password(_DB_PASSWORD) .useSsl(false).maxConnections(MAX_POOL_SIZE).connectionTtl(null) .timeout(0) .protocol(Protocol.HTTP2_JSON).build()

So you suggest to change Protocol.HTTP2_JSON with Protocol.HTTP2_VPACK. Do I have to change somthing else? The server installation require other changes or the workaround is just for java driver code?

after that i will add

StreamReadConstraints.overrideDefaultStreamReadConstraints(
        StreamReadConstraints
                        .builder()
                        .maxStringLength(MY_LIMIT)
                        .build()
);

is that correct?

Thanks
Gianluca

[gianluca-valentini]

@rashtao
I don't find the method overrideDefaultStreamReadConstraints for StreamReadConstraints class neither arango nor jackson package. Can you tell me where i'm wrong?
Gianluca

[rashtao]

com.fasterxml.jackson.core.StreamReadConstraints#overrideDefaultStreamReadConstraints(StreamReadConstraints), since Jackson 2.15.2

https://www.javadoc.io/static/com.fasterxml.jackson.core/jackson-core/2.16.1/com/fasterxml/jackson/core/StreamReadConstraints.html#overrideDefaultStreamReadConstraints-com.fasterxml.jackson.core.StreamReadConstraints-

[gianluca-valentini]

Thanks @rashtao
I will migrate from 2.15.1 to 2.15.3.
what's about the driver question?

[rashtao]

You can change .protocol(Protocol.HTTP2_JSON) with .protocol(Protocol.HTTP2_VPACK).

Note that you do not need to do both, either switching to VPACK or invoking overrideDefaultStreamReadConstraints would be enough.

[gianluca-valentini]

Thanks
it works fine

Gianluca