Out of memory error on initializing Couchbase java Client

Question

Facing out of memory error on initializing Couchbase Java Client. The issue happens in the context of running Test cases in the Gradle build. It doesn't seem to be happening when running individual test cases. It seems to be happening on running all test cases in the build. The error is occurring on MacOS and not on Linux build machine

Environment

JVM = 16 (OpenJDK)
OS = MacOS Monterey
task = Gradle build 
jvm memory settings = -Xmx8000m" "-Xms512m" "-XX:MaxDirectMemorySize=2000m"

StackTrace -

Caused by: java.lang.OutOfMemoryError: Cannot reserve 16384 bytes of direct buffer memory (allocated: 536861104, limit: 536870912)
    at java.base/java.nio.Bits.reserveMemory(Bits.java:178)
    at java.base/java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:121)
    at java.base/java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:330)
    at com.couchbase.client.core.deps.io.netty.channel.unix.Buffer.allocateDirectWithNativeOrder(Buffer.java:40)
    at com.couchbase.client.core.deps.io.netty.channel.unix.IovArray.<init>(IovArray.java:72)
    at com.couchbase.client.core.deps.io.netty.channel.kqueue.KQueueEventLoop.<init>(KQueueEventLoop.java:62)
    at com.couchbase.client.core.deps.io.netty.channel.kqueue.KQueueEventLoopGroup.newChild(KQueueEventLoopGroup.java:151)
    at com.couchbase.client.core.deps.io.netty.channel.kqueue.KQueueEventLoopGroup.newChild(KQueueEventLoopGroup.java:32)
    at com.couchbase.client.core.deps.io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
    at com.couchbase.client.core.deps.io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:60)
    at com.couchbase.client.core.deps.io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:49)
    at com.couchbase.client.core.deps.io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59)
    at com.couchbase.client.core.deps.io.netty.channel.kqueue.KQueueEventLoopGroup.<init>(KQueueEventLoopGroup.java:110)
    at com.couchbase.client.core.deps.io.netty.channel.kqueue.KQueueEventLoopGroup.<init>(KQueueEventLoopGroup.java:97)
    at com.couchbase.client.core.deps.io.netty.channel.kqueue.KQueueEventLoopGroup.<init>(KQueueEventLoopGroup.java:73)
    at com.couchbase.client.core.env.IoEnvironment.createEventLoopGroup(IoEnvironment.java:476)
    at com.couchbase.client.core.env.IoEnvironment.<init>(IoEnvironment.java:285)
    at com.couchbase.client.core.env.IoEnvironment.<init>(IoEnvironment.java:66)
    at com.couchbase.client.core.env.IoEnvironment$Builder.build(IoEnvironment.java:674)
    at com.couchbase.client.core.env.CoreEnvironment.<init>(CoreEnvironment.java:153)
    at com.couchbase.client.java.env.ClusterEnvironment.<init>(ClusterEnvironment.java:53)
    at com.couchbase.client.java.env.ClusterEnvironment.<init>(ClusterEnvironment.java:46)
    at com.couchbase.client.java.env.ClusterEnvironment$Builder.build(ClusterEnvironment.java:213)