I try to run testcases for java-mongodb-driver, before making any changes to the source code.
7 testcases are failed as shown below.

$ ./gradlew check -Dorg.mongodb.test.uri=mongodb://<ip>:27017/

:driver-core:test
i) One test with error "ns not found" as follow:
should deliver started and completed command events for split unacknowleded inserts

com.mongodb.MongoCommandException: Command failed with error -1: 'ns not found' on server <ip>:27017. The full response is

{ "ok" : 0.0, "errmsg" : "ns not found" }

at com.mongodb.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:115)
at com.mongodb.connection.CommandProtocol.execute(CommandProtocol.java:114)
at com.mongodb.connection.WriteProtocolCommandEventSpecification.should deliver started and completed command events for split unacknowleded inserts(WriteProtocolCommandEventSpecification.groovy:145)

com.mongodb.MongoCommandException: Command failed with error -1: 'ns not found' on server <ip>:27017. The full response is

{ "ok" : 0.0, "errmsg" : "ns not found" }

at com.mongodb.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:115)
at com.mongodb.connection.CommandProtocol.execute(CommandProtocol.java:114)
at com.mongodb.connection.WriteProtocolCommandEventSpecification.should deliver started and completed command events for split unacknowleded inserts(WriteProtocolCommandEventSpecification.groovy:145)

ii) Following 6 testcases failed with error as shown
should continue writing on write error when an unordered unacknowledged inserts must be split
should execute split acknowledged inserts
should execute split unacknowledged inserts
should not report write errors on split unacknowledged inserts
should report write errors on split acknowledged inserts
should stop writing on write error when an ordered unacknowledged inserts must be split

io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216 byte(s) of direct memory (used: 50367344, max: 67108864)
at io.netty.util.internal.PlatformDependent.incrementMemoryCounter(PlatformDependent.java:624)
at io.netty.util.internal.PlatformDependent.allocateDirectNoCleaner(PlatformDependent.java:578)
at io.netty.buffer.UnpooledUnsafeNoCleanerDirectByteBuf.allocateDirect(UnpooledUnsafeNoCleanerDirectByteBuf.java:30)
at io.netty.buffer.UnpooledUnsafeDirectByteBuf.<init>(UnpooledUnsafeDirectByteBuf.java:68)
at io.netty.buffer.UnpooledUnsafeNoCleanerDirectByteBuf.<init>(UnpooledUnsafeNoCleanerDirectByteBuf.java:25)
at io.netty.buffer.UnsafeByteBufUtil.newUnsafeDirectByteBuf(UnsafeByteBufUtil.java:625)
at io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:265)
at io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:179)
at io.netty.buffer.AbstractByteBufAllocator.buffer(AbstractByteBufAllocator.java:115)
at com.mongodb.connection.netty.NettyStream.getBuffer(NettyStream.java:93)
at com.mongodb.connection.InternalStreamConnection.getBuffer(InternalStreamConnection.java:514)
at com.mongodb.connection.ByteBufferBsonOutput.getByteBufferAtIndex(ByteBufferBsonOutput.java:91)
at com.mongodb.connection.ByteBufferBsonOutput.getCurrentByteBuffer(ByteBufferBsonOutput.java:86)
at com.mongodb.connection.ByteBufferBsonOutput.writeBytes(ByteBufferBsonOutput.java:62)
at org.bson.io.OutputBuffer.writeBytes(OutputBuffer.java:51)
at org.bson.BsonBinaryWriter.doWriteBinaryData(BsonBinaryWriter.java:163)
at org.bson.AbstractBsonWriter.writeBinaryData(AbstractBsonWriter.java:360)
at org.bson.codecs.BsonBinaryCodec.encode(BsonBinaryCodec.java:31)
at org.bson.codecs.BsonBinaryCodec.encode(BsonBinaryCodec.java:28)
at org.bson.codecs.EncoderContext.encodeWithChildContext(EncoderContext.java:91)
at org.bson.codecs.BsonDocumentCodec.writeValue(BsonDocumentCodec.java:136)
at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:115)
at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:41)
at com.mongodb.connection.RequestMessage.addDocument(RequestMessage.java:253)
at com.mongodb.connection.RequestMessage.addCollectibleDocument(RequestMessage.java:219)
at com.mongodb.connection.InsertMessage.encodeMessageBodyWithMetadata(InsertMessage.java:73)
at com.mongodb.connection.RequestMessage.encodeWithMetadata(RequestMessage.java:160)
at com.mongodb.connection.WriteProtocol.execute(WriteProtocol.java:89)
at com.mongodb.connection.InsertProtocol.execute(InsertProtocol.java:68)
at com.mongodb.connection.InsertProtocol.execute(InsertProtocol.java:39)
at com.mongodb.connection.ProtocolTestHelper.execute(ProtocolTestHelper.java:31)
at com.mongodb.connection.WriteProtocolSpecification.should continue writing on write error when an unordered unacknowledged inserts must be split(WriteProtocolSpecification.groovy:201)

java.lang.ClassCastException: io.netty.util.internal.OutOfDirectMemoryError incompatible with java.lang.RuntimeException
at com.mongodb.async.FutureResultCallback.get(FutureResultCallback.java:77)
at com.mongodb.connection.ProtocolTestHelper.execute(ProtocolTestHelper.java:29)
at com.mongodb.connection.WriteProtocolSpecification.should continue writing on write error when an unordered unacknowledged inserts must be split(WriteProtocolSpecification.groovy:201)

Initially I used to get test search not found error, solved after mongodb server started with text search enabled.

Regards,

Hadi